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Zhao G, Luo C, Wu B, Zhang M, Wang H, Hua Q. Low-Temperature In Situ Lithiation Construction of a Lithiophilic Particle-Selective Interlayer for Solid-State Lithium Metal Batteries. ACS APPLIED MATERIALS & INTERFACES 2023; 15:50508-50521. [PMID: 37870285 DOI: 10.1021/acsami.3c11477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2023]
Abstract
Unexpected interface resistance and lithium dendrite puncture hinder the application of garnet-type solid-state electrolytes in high-energy-density systems. Different from the previous high-temperature (>180 °C) molten lithium that promotes the alloying reaction between the coating layer and Li to enhance the interface contact, herein, we introduce liquid-metal-like SbCl3 to construct a three-dimensional Li+ directional-selection interlayer by in situ low-temperature lithiation (80 °C). An interlayer with a more negative interface energy composed of SbLi3 and LiCl exhibits a superior affinity with Li and LGLZO, which reduces the interface resistance and suppresses the growth of Li dendrites by an insulated electron. The introduction of the SbCl3 modification layer into Li/Li symmetric cells enables charge/discharge at a current density of 6.0 mA cm-2 and operation for more than 1000 h under 2.0 mA cm-2 at room temperature. The full cells with the LiFePO4 cathode exhibit a high residual capacity of 144.8 mAh g-1 at 0.5 C after 1000 cycles and excellent cycling stability with a retention ratio of 94.7% at 1 C after 600 cycles. The low-temperature lithiation method based on an energy-saving perspective should be applied to other types of solid-state electrolyte modification strategies.
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Affiliation(s)
- Guoqiang Zhao
- Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - Changwei Luo
- Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - Bin Wu
- Firmvolt Technology Ltd, Hangzhou, 310000, China
| | | | - Haoqi Wang
- Laboratory of Beam Technology of Ministry of Education, Center of Ion Beam Technology & Energy Materials, Beijing Normal University, Beijing 100875, China
| | - Qingsong Hua
- Laboratory of Beam Technology of Ministry of Education, Center of Ion Beam Technology & Energy Materials, Beijing Normal University, Beijing 100875, China
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Jabeen M, Ren Z, Ishaq M, Yuan S, Bao X, Shu C, Liu X, Liu X, Li L, He YS, Ma ZF, Liao XZ. Stable Operation Induced by Plastic Crystal Electrolyte Used in Ni-Rich NMC811 Cathodes for Li-Ion Batteries. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 37890042 DOI: 10.1021/acsami.3c10643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/29/2023]
Abstract
The LiNi0.8Mn0.1Co0.1O2 (NMC811) cathode material has been of significant consideration owing to its high energy density for Li-ion batteries. However, the poor cycling stability in a carbonate electrolyte limits its further development. In this work, we report the excellent electrochemical performance of the NMC811 cathode using a rational electrolyte based on organic ionic plastic crystal N-ethyl-N-methyl pyrrolidinium bis(fluorosulfonyl)imide C2mpyr[FSI], with the addition of (1:1 mol) LiFSI salt. This plastic crystal electrolyte (PC) is a thick viscous liquid with an ionic conductivity of 2.3 × 10-3 S cm-1 and a high Li+ transference number of 0.4 at ambient temperature. The NMC811@PC cathode delivers a discharge capacity of 188 mA h g-1 at a rate of 0.2 C with a capacity retention of 94.5% after 200 cycles, much higher than that of using a carbonate electrolyte (54.3%). Moreover, the NMC811@PC cathode also exhibits a superior high-rate capability with a discharge capacity of 111.0 mA h g-1 at the 10 C rate. The significantly improved cycle performance of the NMC811@PC cathode can be attributed to the high Li+ conductivity of the PC electrolyte, the stable Li+ conductive CEI film, and the maintaining of particle integrity during long-term cycling. The admirable electrochemical performance of the NMC811|C2mpyr[FSI]:[LiFSI] system exhibits a promising application of the plastic crystal electrolyte for high voltage layered oxide cathode materials in advanced lithium-ion batteries.
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Affiliation(s)
- Maher Jabeen
- School of Chemistry and Chemical Engineering, Shanghai Electrochemical Energy Device Research Center, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zhouhong Ren
- School of Chemistry and Chemical Engineering, Shanghai Electrochemical Energy Device Research Center, Shanghai Jiao Tong University, Shanghai 200240, China
- In-Situ Center for Physical Sciences, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Muhammad Ishaq
- School of Chemistry and Chemical Engineering, Shanghai Electrochemical Energy Device Research Center, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Siqi Yuan
- School of Chemistry and Chemical Engineering, Shanghai Electrochemical Energy Device Research Center, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xu Bao
- School of Chemistry and Chemical Engineering, Shanghai Electrochemical Energy Device Research Center, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Chaojiu Shu
- School of Chemistry and Chemical Engineering, Shanghai Electrochemical Energy Device Research Center, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xiaoning Liu
- School of Chemistry and Chemical Engineering, Shanghai Electrochemical Energy Device Research Center, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xi Liu
- School of Chemistry and Chemical Engineering, Shanghai Electrochemical Energy Device Research Center, Shanghai Jiao Tong University, Shanghai 200240, China
- In-Situ Center for Physical Sciences, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Lei Li
- School of Chemistry and Chemical Engineering, Shanghai Electrochemical Energy Device Research Center, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Yu-Shi He
- School of Chemistry and Chemical Engineering, Shanghai Electrochemical Energy Device Research Center, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zi-Feng Ma
- School of Chemistry and Chemical Engineering, Shanghai Electrochemical Energy Device Research Center, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xiao-Zhen Liao
- School of Chemistry and Chemical Engineering, Shanghai Electrochemical Energy Device Research Center, Shanghai Jiao Tong University, Shanghai 200240, China
- Key Laboratory of Green and High-end Utilization of Salt Lake Resources (Chinese Academy of Sciences), Shanghai Jiao Tong University, Shanghai 200240, China
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Guo R, Chen C, Bannenberg LJ, Wang H, Liu H, Yu M, Sofer Z, Lei Z, Wang X. Interfacial Designs of MXenes for Mild Aqueous Zinc-Ion Storage. SMALL METHODS 2023; 7:e2201683. [PMID: 36932899 DOI: 10.1002/smtd.202201683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 02/16/2023] [Indexed: 06/18/2023]
Abstract
Limited Li resources, high cost, and safety risks of using organic electrolytes have stimulated a strong motivation to develop non-Li aqueous batteries. Aqueous Zn-ion storage (ZIS) devices offer low-cost and high-safety solutions. However, their practical applications are at the moment restricted by their short cycle life arising mainly from irreversible electrochemical side reactions and processes at the interfaces. This review sums up the capability of using 2D MXenes to increase the reversibility at the interface, assist the charge transfer process, and thereby improve the performance of ZIS. First, they discuss the ZIS mechanism and irreversibility of typical electrode materials in mild aqueous electrolytes. Then, applications of MXenes in different ZIS components are highlighted, including as electrodes for Zn2+ intercalation, protective layers of Zn anode, hosts for Zn deposition, substrates, and separators. Finally, perspectives are put forward on further optimizing MXenes to improve the ZIS performance.
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Affiliation(s)
- Rui Guo
- Department of Radiation Science and Technology, Faculty of Applied Sciences, Delft University of Technology, Delft, 2629JB, The Netherlands
- Key Laboratory of Applied Surface and Colloid Chemistry, MOE, Shaanxi Engineering Lab for Advanced Energy Technology, Shaanxi Key Laboratory for Advanced Energy Devices, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, Shaanxi, 710119, China
| | - Chaofan Chen
- Department of Radiation Science and Technology, Faculty of Applied Sciences, Delft University of Technology, Delft, 2629JB, The Netherlands
| | - Lars J Bannenberg
- Department of Radiation Science and Technology, Faculty of Applied Sciences, Delft University of Technology, Delft, 2629JB, The Netherlands
| | - Hao Wang
- Department of Radiation Science and Technology, Faculty of Applied Sciences, Delft University of Technology, Delft, 2629JB, The Netherlands
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China
| | - Haozhe Liu
- Department of Radiation Science and Technology, Faculty of Applied Sciences, Delft University of Technology, Delft, 2629JB, The Netherlands
| | - Minghao Yu
- Faculty of Chemistry and Food Chemistry, Center for Advancing Electronics Dresden Technische Universität Dresden Modulgebäude, 01217, Dresden, Germany
| | - Zdenek Sofer
- Institute of Chemical Technology, University of Chemistry and Technology Prague, Prague 6, 16628, Czech Republic
| | - Zhibin Lei
- Key Laboratory of Applied Surface and Colloid Chemistry, MOE, Shaanxi Engineering Lab for Advanced Energy Technology, Shaanxi Key Laboratory for Advanced Energy Devices, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, Shaanxi, 710119, China
| | - Xuehang Wang
- Department of Radiation Science and Technology, Faculty of Applied Sciences, Delft University of Technology, Delft, 2629JB, The Netherlands
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Zhang ZK, Ding SP, Ye Z, Xia DL, Xu JT. PEO-Based Block Copolymer Electrolytes Containing Double Conductive Phases with Improved Mechanical and Electrochemical Properties. MATERIALS (BASEL, SWITZERLAND) 2022; 15:7930. [PMID: 36431415 PMCID: PMC9699265 DOI: 10.3390/ma15227930] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Revised: 11/05/2022] [Accepted: 11/07/2022] [Indexed: 06/16/2023]
Abstract
In this work, the advanced all solid-state block copolymer electrolytes (SBCPEs) for lithium-ion batteries with double conductive phases, poly(ethylene oxide)-b-poly(trimethyl-N-((2-(dimethylamino)ethyl methacrylate)-7-propyl)-ammonium bis(trifluoromethanesulfonyl) imide) (PEO-b-PDM-dTFSI)/LiTFSI, were fabricated, in which the charged PDM-dTFSI block contained double quaternary ammonium cations and the PEO block was doped with LiTFSI. The disordered (DIS) and ordered lamellae (LAM) phase structures were achieved by adjusting the composition of the block copolymer and the doping ratio r. In addition, the presence of the hard PDM-dTFSI block and the formation of the LAM phase structure resulted in a good mechanical strength of the solid PEO-b-PDM-dTFSI/LiTFSI electrolyte, and it could maintain a high level of 104 Pa at 100 °C, which was around 10,000 times stronger than that of the PEO/LiTFSI electrolyte. Based on the good mechanical and electrochemical properties, the PEO-b-PDM-dTFSI/LiTFSI SBCPE exhibited excellent long-term galvanostatic cycle performance, indicating the strong ability to suppress lithium dendrites.
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Lorenz M, Kilchert F, Nürnberg P, Schammer M, Latz A, Horstmann B, Schönhoff M. Local Volume Conservation in Concentrated Electrolytes Is Governing Charge Transport in Electric Fields. J Phys Chem Lett 2022; 13:8761-8767. [PMID: 36102654 DOI: 10.1021/acs.jpclett.2c02398] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
While ion transport processes in concentrated electrolytes, e.g., based on ionic liquids (IL), are a subject of intense research, the role of conservation laws and reference frames is still a matter of debate. Employing electrophoretic NMR, we show that momentum conservation, a typical prerequisite in molecular dynamics (MD) simulations, is not governing ion transport. Involving density measurements to determine molar volumes of distinct ion species, we propose that conservation of local molar species volumes is the governing constraint for ion transport. The experimentally quantified net volume flux is found to be zero, implying a nonzero local momentum flux, as tested in pure ILs and IL-based electrolytes for a broad variety of concentrations and chemical compositions. This constraint is consistent with incompressibility, but not with a local application of momentum conservation. The constraint affects the calculation of transference numbers as well as comparisons of MD results to experimental findings.
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Affiliation(s)
- Martin Lorenz
- Institute of Physical Chemistry, University of Münster, Corrensstrasse 28/30, 48149 Münster, Germany
| | - Franziska Kilchert
- German Aerospace Center, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany
| | - Pinchas Nürnberg
- Institute of Physical Chemistry, University of Münster, Corrensstrasse 28/30, 48149 Münster, Germany
| | - Max Schammer
- German Aerospace Center, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany
| | - Arnulf Latz
- German Aerospace Center, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany
- Helmholtz Institute Ulm, Helmholtzstraße 11, 89081 Ulm, Germany
- Universität Ulm, Albert-Einstein-Allee 47, 89081 Ulm, Germany
| | - Birger Horstmann
- German Aerospace Center, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany
- Helmholtz Institute Ulm, Helmholtzstraße 11, 89081 Ulm, Germany
- Universität Ulm, Albert-Einstein-Allee 47, 89081 Ulm, Germany
| | - Monika Schönhoff
- Institute of Physical Chemistry, University of Münster, Corrensstrasse 28/30, 48149 Münster, Germany
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Trano S, Corsini F, Pascuzzi G, Giove E, Fagiolari L, Amici J, Francia C, Turri S, Bodoardo S, Griffini G, Bella F. Lignin as Polymer Electrolyte Precursor for Stable and Sustainable Potassium Batteries. CHEMSUSCHEM 2022; 15:e202200294. [PMID: 35363435 PMCID: PMC9322549 DOI: 10.1002/cssc.202200294] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 04/01/2022] [Indexed: 06/14/2023]
Abstract
Potassium batteries show interesting peculiarities as large-scale energy storage systems and, in this scenario, the formulation of polymer electrolytes obtained from sustainable resources or waste-derived products represents a milestone activity. In this study, a lignin-based membrane is designed by crosslinking a pre-oxidized Kraft lignin matrix with an ethoxylated difunctional oligomer, leading to self-standing membranes that are able to incorporate solvated potassium salts. The in-depth electrochemical characterization highlights a wide stability window (up to 4 V) and an ionic conductivity exceeding 10-3 S cm-1 at ambient temperature. When potassium metal cell prototypes are assembled, the lignin-based electrolyte attains significant electrochemical performances, with an initial specific capacity of 168 mAh g-1 at 0.05 A g-1 and an excellent operation for more than 200 cycles, which is an unprecedented outcome for biosourced systems in potassium batteries.
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Affiliation(s)
- Sabrina Trano
- Department of Applied Science and TechnologyPolitecnico di TorinoCorso Duca degli Abruzzi 2410129TorinoItaly
| | - Francesca Corsini
- Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”Politecnico di MilanoPiazza Leonardo da Vinci 3220133MilanoItaly
| | - Giuseppe Pascuzzi
- Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”Politecnico di MilanoPiazza Leonardo da Vinci 3220133MilanoItaly
| | - Elisabetta Giove
- Department of Applied Science and TechnologyPolitecnico di TorinoCorso Duca degli Abruzzi 2410129TorinoItaly
| | - Lucia Fagiolari
- Department of Applied Science and TechnologyPolitecnico di TorinoCorso Duca degli Abruzzi 2410129TorinoItaly
- National Interuniversity Consortium of Material Science and Technology (INSTM)Via Giuseppe Giusti 950121FirenzeItaly
| | - Julia Amici
- Department of Applied Science and TechnologyPolitecnico di TorinoCorso Duca degli Abruzzi 2410129TorinoItaly
- National Interuniversity Consortium of Material Science and Technology (INSTM)Via Giuseppe Giusti 950121FirenzeItaly
| | - Carlotta Francia
- Department of Applied Science and TechnologyPolitecnico di TorinoCorso Duca degli Abruzzi 2410129TorinoItaly
- National Interuniversity Consortium of Material Science and Technology (INSTM)Via Giuseppe Giusti 950121FirenzeItaly
| | - Stefano Turri
- Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”Politecnico di MilanoPiazza Leonardo da Vinci 3220133MilanoItaly
- National Interuniversity Consortium of Material Science and Technology (INSTM)Via Giuseppe Giusti 950121FirenzeItaly
| | - Silvia Bodoardo
- Department of Applied Science and TechnologyPolitecnico di TorinoCorso Duca degli Abruzzi 2410129TorinoItaly
- National Interuniversity Consortium of Material Science and Technology (INSTM)Via Giuseppe Giusti 950121FirenzeItaly
| | - Gianmarco Griffini
- Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”Politecnico di MilanoPiazza Leonardo da Vinci 3220133MilanoItaly
- National Interuniversity Consortium of Material Science and Technology (INSTM)Via Giuseppe Giusti 950121FirenzeItaly
| | - Federico Bella
- Department of Applied Science and TechnologyPolitecnico di TorinoCorso Duca degli Abruzzi 2410129TorinoItaly
- National Interuniversity Consortium of Material Science and Technology (INSTM)Via Giuseppe Giusti 950121FirenzeItaly
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Volkov VI, Yarmolenko OV, Chernyak AV, Slesarenko NA, Avilova IA, Baymuratova GR, Yudina AV. Polymer Electrolytes for Lithium-Ion Batteries Studied by NMR Techniques. MEMBRANES 2022; 12:membranes12040416. [PMID: 35448386 PMCID: PMC9028971 DOI: 10.3390/membranes12040416] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 03/30/2022] [Indexed: 11/16/2022]
Abstract
This review is devoted to different types of novel polymer electrolytes for lithium power sources developed during the last decade. In the first part, the compositions and conductivity of various polymer electrolytes are considered. The second part contains NMR applications to the ion transport mechanism. Polymer electrolytes prevail over liquid electrolytes because of their exploitation safety and wider working temperature ranges. The gel electrolytes are mainly attractive. The systems based on polyethylene oxide, poly(vinylidene fluoride-co-hexafluoropropylene), poly(ethylene glycol) diacrylate, etc., modified by nanoparticle (TiO2, SiO2, etc.) additives and ionic liquids are considered in detail. NMR techniques such as high-resolution NMR, solid-state NMR, magic angle spinning (MAS) NMR, NMR relaxation, and pulsed-field gradient NMR applications are discussed. 1H, 7Li, and 19F NMR methods applied to polymer electrolytes are considered. Primary attention is given to the revelation of the ion transport mechanism. A nanochannel structure, compositions of ion complexes, and mobilities of cations and anions studied by NMR, quantum-chemical, and ionic conductivity methods are discussed.
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Affiliation(s)
- Vitaly I. Volkov
- Institute of Problems of Chemical Physics RAS, 142432 Chernogolovka, Russia; (O.V.Y.); (A.V.C.); (N.A.S.); (I.A.A.); (G.R.B.); (A.V.Y.)
- Scientific Center in Chernogolovka RAS, 142432 Chernogolovka, Russia
- Correspondence: or
| | - Olga V. Yarmolenko
- Institute of Problems of Chemical Physics RAS, 142432 Chernogolovka, Russia; (O.V.Y.); (A.V.C.); (N.A.S.); (I.A.A.); (G.R.B.); (A.V.Y.)
| | - Alexander V. Chernyak
- Institute of Problems of Chemical Physics RAS, 142432 Chernogolovka, Russia; (O.V.Y.); (A.V.C.); (N.A.S.); (I.A.A.); (G.R.B.); (A.V.Y.)
- Scientific Center in Chernogolovka RAS, 142432 Chernogolovka, Russia
| | - Nikita A. Slesarenko
- Institute of Problems of Chemical Physics RAS, 142432 Chernogolovka, Russia; (O.V.Y.); (A.V.C.); (N.A.S.); (I.A.A.); (G.R.B.); (A.V.Y.)
| | - Irina A. Avilova
- Institute of Problems of Chemical Physics RAS, 142432 Chernogolovka, Russia; (O.V.Y.); (A.V.C.); (N.A.S.); (I.A.A.); (G.R.B.); (A.V.Y.)
| | - Guzaliya R. Baymuratova
- Institute of Problems of Chemical Physics RAS, 142432 Chernogolovka, Russia; (O.V.Y.); (A.V.C.); (N.A.S.); (I.A.A.); (G.R.B.); (A.V.Y.)
| | - Alena V. Yudina
- Institute of Problems of Chemical Physics RAS, 142432 Chernogolovka, Russia; (O.V.Y.); (A.V.C.); (N.A.S.); (I.A.A.); (G.R.B.); (A.V.Y.)
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Temperature Sensor Based on Periodically Tapered Optical Fibers. SENSORS 2021; 21:s21248358. [PMID: 34960452 PMCID: PMC8703804 DOI: 10.3390/s21248358] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 12/10/2021] [Accepted: 12/13/2021] [Indexed: 12/01/2022]
Abstract
In this paper, the fabrication and characterization of a temperature sensor based on periodically tapered optical fibers (PTOF) are presented. The relation between the geometry of the sensors and sensing ability was investigated in order to find the relatively simple structure of a sensor. Four types of PTOF structures with two, four, six and eight waists were manufactured with the fusion splicer. For each PTOF type, the theoretical free spectral range (FSR) was calculated and compared with measurements. The experiments were conducted for a temperature range of 20–70 °C. The results proved that the number of the tapered regions in PTOF is crucial, because some of the investigated structures did not exhibit the temperature response. The interference occurring inside the structures with two and four waists was found be too weak and, therefore, the transmission dip was hardly visible. We proved that sensors with a low number of tapered regions cannot be considered as a temperature sensor. Sufficiently more valuable results were obtained for the last two types of PTOF, where the sensor’s sensitivity was equal to 0.07 dB/°C with an excellent linear fitting (R2 > 0.99). The transmission dip shift can be described by a linear function (R2 > 0.97) with a slope α > 0.39 nm/°C.
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