1
|
Zhang S, Wu S, Hwang J, Matsumoto K, Hagiwara R. Unprotected Organic Cations─The Dilemma of Highly Li-Concentrated Ionic Liquid Electrolytes. J Am Chem Soc 2024; 146:8352-8361. [PMID: 38494762 DOI: 10.1021/jacs.3c14110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/19/2024]
Abstract
Highly Li-concentrated electrolytes have been widely studied to harness their uniquely varying bulk and interface properties that arise from their distinctive physicochemical properties and coordination structures. Similar strategies have been applied in the realm of ionic liquid electrolytes to exploit their improved functionalities. Despite these prospects, the impact of organic cation behavior on interfacial processes remains largely underexplored compared to the widely studied anion behavior. The present study demonstrates that the weakened interactions between cations and anions engender "unprotected" organic cations in highly Li-concentrated ionic liquid electrolytes, leading to the decomposition of electrolytes during the initial charge. This decomposition behavior is manifested by the substantial irreversible capacities and inferior initial Coulombic efficiencies observed during the initial charging of graphite negative electrodes, resulting in considerable electrolyte consumption and diminished energy densities in full-cell configurations. The innate cation behavior is ascertained by examining the coordination environment of ionic liquid electrolytes with varied Li concentrations, where intricate ionic interactions between organic cations and anions are unveiled. In addition, anionic species with high Lewis basicity were introduced to reinforce the ionic interactions involving organic cations and improve the initial Coulombic efficiency. This study verifies the role of unprotected organic cations while highlighting the significance of the coordination environment in the performance of ionic liquid electrolytes.
Collapse
Affiliation(s)
- Shaoning Zhang
- Graduate School of Energy Science, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan
| | - Shengan Wu
- Graduate School of Energy Science, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan
| | - Jinkwang Hwang
- Graduate School of Energy Science, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan
| | - Kazuhiko Matsumoto
- Graduate School of Energy Science, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan
| | - Rika Hagiwara
- Graduate School of Energy Science, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan
| |
Collapse
|
2
|
Sánchez-Ramírez N, Monje IE, Bélanger D, Camargo PH, Torresi RM. High rate and long-term cycling of silicon anodes with phosphonium-based ionic liquids as electrolytes for lithium-ion batteries. Electrochim Acta 2023. [DOI: 10.1016/j.electacta.2022.141680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
3
|
Nuclear Magnetic Resonance for interfaces in rechargeable batteries. Curr Opin Colloid Interface Sci 2022. [DOI: 10.1016/j.cocis.2022.101675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
|
4
|
Araño K, Gautier N, Kerr R, Lestriez B, Le Bideau J, Howlett PC, Guyomard D, Forsyth M, Dupré N. Understanding the Capacity Decay of Si/NMC622 Li-Ion Batteries Cycled in Superconcentrated Ionic Liquid Electrolytes: A New Perspective. ACS APPLIED MATERIALS & INTERFACES 2022; 14:52715-52728. [PMID: 36394288 DOI: 10.1021/acsami.2c10817] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Silicon-containing Li-ion batteries have been the focus of many energy storage research efforts because of the promise of high energy density. Depending on the system, silicon generally demonstrates stable performance in half-cells, which is often attributed to the unlimited lithium supply from the lithium (Li) metal counter electrode. Here, the electrochemical performance of silicon with a high voltage NMC622 cathode was investigated in superconcentrated phosphonium-based ionic liquid (IL) electrolytes. As a matter of fact, there is very limited work and understanding of the full cell cycling of silicon in such a new class of electrolytes. The electrochemical behavior of silicon in the various IL electrolytes shows a gradual and steeper capacity decay, compared to what we previously reported in half-cells. This behavior is linked to a different evolution of the silicon morphology upon cycling, and the characterization of cycled electrodes points toward mechanical reasons, complete disconnection of part of the electrode, or internal mechanical stress, due to silicon and Li metal volume variation upon cycling, to explain the progressive capacity fading in full cell configuration. An extremely stable solid electrolyte interphase (SEI) in the full Li-ion cells can be seen from a combination of qualitative and quantitative information from transmission electron microscopy, X-ray photoelectron spectroscopy, electrochemical impedance spectroscopy, and magic angle spinning nuclear magnetic resonance. Our findings provide a new perspective to full cell interpretation regarding capacity fading, which is oftentimes linked almost exclusively to the loss of Li inventory but also more broadly, and provide new insights into the impact of the evolution of silicon morphology on the electrochemical behavior.
Collapse
Affiliation(s)
- Khryslyn Araño
- Institut des Matériaux Jean Rouxel (IMN), CNRS, Université de Nantes, Nantes F-44000, France
- Institute for Frontier Materials (IFM), Deakin University, 221 Burwood Highway, Burwood, Victoria 3125, Australia
- French Environment and Energy Management Agency, 20, Avenue du Grésillé-BP 90406, Angers Cedex 01 49004, France
| | - Nicolas Gautier
- Institut des Matériaux Jean Rouxel (IMN), CNRS, Université de Nantes, Nantes F-44000, France
| | - Robert Kerr
- Institute for Frontier Materials (IFM), Deakin University, 221 Burwood Highway, Burwood, Victoria 3125, Australia
| | - Bernard Lestriez
- Institut des Matériaux Jean Rouxel (IMN), CNRS, Université de Nantes, Nantes F-44000, France
| | - Jean Le Bideau
- Institut des Matériaux Jean Rouxel (IMN), CNRS, Université de Nantes, Nantes F-44000, France
| | - Patrick C Howlett
- Institute for Frontier Materials (IFM), Deakin University, 221 Burwood Highway, Burwood, Victoria 3125, Australia
| | - Dominique Guyomard
- Institut des Matériaux Jean Rouxel (IMN), CNRS, Université de Nantes, Nantes F-44000, France
| | - Maria Forsyth
- Institute for Frontier Materials (IFM), Deakin University, 221 Burwood Highway, Burwood, Victoria 3125, Australia
| | - Nicolas Dupré
- Institut des Matériaux Jean Rouxel (IMN), CNRS, Université de Nantes, Nantes F-44000, France
| |
Collapse
|
5
|
Kaushik S, Kubota K, Hwang J, Matsumoto K, Hagiwara R. Strategies for Harnessing High Rate and Cycle Performance from Graphite Electrodes in Potassium-Ion Batteries. ACS APPLIED MATERIALS & INTERFACES 2022; 14:14302-14312. [PMID: 35302758 DOI: 10.1021/acsami.2c02685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Potassium-ion batteries (PIBs) have been lauded as the next-generation energy storage systems on account of their high voltage capabilities and low costs and the high abundance of potassium resources. However, the practical utility of PIBs has been heavily encumbered by severe K metal dendrite formation, safety issues, and insufficient electrochemical performance during operations─indeed critical issues that underpin the need for functional electrolytes with high thermal stability, robust solid-electrolyte interphase (SEI)-forming capabilities, and high electrochemical performance. In a bid to establish a knowledge framework for harnessing high rate capabilities and long cycle life from graphite negative electrodes, this study presents the physical properties and electrochemical behavior of a high K+ concentration inorganic ionic liquid (IL) electrolyte, K[FSA]-Cs[FSA] (FSA- = bis(fluorosulfonyl)amide) (54:46 in mol), at an intermediate temperature of 70 °C. This IL electrolyte demonstrates an ionic conductivity of 2.54 mS cm-1 and a wide electrochemical window of 5.82 V. Charge-discharge tests performed on a graphite negative electrode manifest a high discharge capacity of 278 mAh g-1 (0.5 C) at 70 °C, a high rate capability (106 mAh g-1 at 100 C), and a long cyclability (98.7% after 450 cycles). Stable interfacial properties observed by electrochemical impedance spectroscopy during cycling are attributed to the formation of sulfide-rich all-inorganic SEI, which was examined through X-ray photoelectron spectroscopy. The performance of the IL is collated with that of an N-methyl-N-propylpyrrolidinium-based organic IL to provide insight into the synergism between the highly concentrated K+ electrolyte at intermediate temperatures and the all-inorganic SEI during electrochemical operations of the graphite negative electrode.
Collapse
Affiliation(s)
- Shubham Kaushik
- AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL), Sakyo-ku, Kyoto 606-8501, Japan
| | - Keigo Kubota
- AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL), Sakyo-ku, Kyoto 606-8501, Japan
| | - Jinkwang Hwang
- Graduate School of Energy Science, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Kazuhiko Matsumoto
- AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL), Sakyo-ku, Kyoto 606-8501, Japan
- Graduate School of Energy Science, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Rika Hagiwara
- AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL), Sakyo-ku, Kyoto 606-8501, Japan
- Graduate School of Energy Science, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| |
Collapse
|
6
|
Lebedeva O, Kultin D, Kustov L. Electrochemical Synthesis of Unique Nanomaterials in Ionic Liquids. NANOMATERIALS 2021; 11:nano11123270. [PMID: 34947620 PMCID: PMC8705126 DOI: 10.3390/nano11123270] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 11/24/2021] [Accepted: 11/27/2021] [Indexed: 11/16/2022]
Abstract
The review considers the features of the processes of the electrochemical synthesis of nanostructures in ionic liquids (ILs), including the production of carbon nanomaterials, silicon and germanium nanoparticles, metallic nanoparticles, nanomaterials and surface nanostructures based on oxides. In addition, the analysis of works on the synthesis of nanoscale polymer films of conductive polymers prepared using ionic liquids by electrochemical methods is given. The purpose of the review is to dwell upon an aspect of the applicability of ILs that is usually not fully reflected in modern literature, the synthesis of nanostructures (including unique ones that cannot be obtained in other electrolytes). The current underestimation of ILs as an electrochemical medium for the synthesis of nanomaterials may limit our understanding and the scope of their potential application. Another purpose of our review is to expand their possible application and to show the relative simplicity of the experimental part of the work.
Collapse
Affiliation(s)
- Olga Lebedeva
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia; (O.L.); (D.K.)
| | - Dmitry Kultin
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia; (O.L.); (D.K.)
| | - Leonid Kustov
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia; (O.L.); (D.K.)
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, 119991 Moscow, Russia
- Institute of Ecology and Engineering, National Science and Technology University “MISiS”, Leninsky Prospect 4, 119049 Moscow, Russia
- Correspondence: ; Tel.: +7-495-939-5261
| |
Collapse
|