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Ko WY, Wu TC, He SY, Lin KJ. Phosphorus-doped TiO 2mesoporous nanocrystals for anodes in high-current-rate lithium ion batteries. NANOTECHNOLOGY 2024; 35:175403. [PMID: 38271726 DOI: 10.1088/1361-6528/ad22aa] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Accepted: 01/25/2024] [Indexed: 01/27/2024]
Abstract
Limited by the intrinsic low electronic conductivity and inferior electrode kinetics, the use of TiO2as an anode material for lithium ion batteries (LIBs) is hampered. Nanoscale surface-engineering strategies of morphology control and particle size reduction have been devoted to increase the lithium storage performances. It is found that the ultrafine nanocrystal with mesoporous framework plays a crucial role in achieving the excellent electrochemical performances due to the surface area effect. Herein, a promising anode material for LIBs consisting of phosphorus-doped TiO2mesoporous nanocrystals (P-TMC) with ultrafine size of 2-8 nm and high specific surface area (234.164 m2g-1) has been synthesized. It is formed through a hydrothermal process and NaBH4assisted heat treatment for anatase defective TiO2(TiO2-x) formation followed by a simple gas phosphorylation process in a low-cost reactor for P-doping. Due to the merits of the large specific surface area for providing more reaction sites for Li+ions to increase the storage capacity and the presence of oxygen vacancies and P-doping for enhancing material's electronic conductivity and diffusion coefficient of ions, the as-designed P-TMC can display improved electrochemical properties. As a LIB anode, it can deliver a high reversible discharge capacity of 187 mAh g-1at 0.2 C and a good long cycling performance with ∼82.6% capacity retention (101 mAh g-1) after 2500 cycles at 10 C with an average capacity loss of only 0.007% per cycle. Impressively, even the current rate increases to 100 times of the original rate, a satisfactory capacity of 104 mAh g-1can be delivered, displaying good rate capacity. These results suggest the P-TMC a viable choice for application as an anode material in LIB applications. Also, the strategy in this work can be easily extended to the design of other high-performance electrode materials with P-doping for energy storage.
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Affiliation(s)
- Wen-Yin Ko
- Department of Chemistry, National Chung Hsing University, Taichung (402), Taiwan
| | - Tung-Ching Wu
- Department of Chemistry, National Chung Hsing University, Taichung (402), Taiwan
| | - Sin-Yu He
- Department of Chemistry, National Chung Hsing University, Taichung (402), Taiwan
| | - Kuan-Jiuh Lin
- Department of Chemistry, National Chung Hsing University, Taichung (402), Taiwan
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Kulchu A, Khalaniya RA, Mironov AV, Bogach AV, Aksenov SM, Lyssenko KA, Shevelkov AV. Interplay of two magnetic sublattices in related compounds Sm 2Mn 1-xGa 6-yGe y ( x = 0.1-0.3, y = 0.6-1.0) and Sm 4MnGa 12-yGe y ( y = 3.0-3.5) with different ordering of empty and filled (Ga,Ge) 6 octahedra. Dalton Trans 2024; 53:1506-1516. [PMID: 38131653 DOI: 10.1039/d3dt03505k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
Single crystals of two new intermetallic phases Sm2Mn1-xGa6-yGey (x = 0.1-0.3, y = 0.6-1.0) and Sm4MnGa12-yGey (y = 3.0-3.5) were grown using a self-flux technique. According to single crystal X-ray diffraction data, Sm4MnGa12-yGey is characterised by the Y4PdGa12 structure type (a ∼ 8.65 Å; Im3̄m), while Sm2Mn1-xGa6-yGey formally adopts the K2PtCl6 structure type (a ∼ 8.71 Å; Fm3̄m). The general features of both compounds with rather similar crystal structures are represented by the alternation of empty and Mn-filled p-element octahedra, the order of which is determined by the Mn concentration. The diffraction data for Sm2Mn1-xGa6-yGey reveal a large concentration of Mn vacancies (x ∼ 0.3), which affects adjacent Ga/Ge atoms leading to their shift towards the vacancy. Both compounds demonstrate two ferromagnetic-like transitions and the presence of two interacting Mn and Sm magnetic sublattices. The Mn sublattice orders at TC1 of 143 K and 318 K, while the Sm one orders at lower temperatures at TC2 of 50 K and 280 K for Sm4MnGa8.6Ge3.4 and Sm2Mn0.74Ga5.1Ge0.9, respectively. The increase in Mn content not only increases the ordering temperatures, but also dramatically decreases the coercivity μ0HC from 230 mT to just 6.5 mT at 2 K. Despite the presence of two magnetically active sublattices in Sm2Mn0.74Ga5.1Ge0.9, the magnetic entropy change is quite low and only reaches 0.3 J kg-1 K-1 at T = 300 K and μ0H = 5 T, while the estimated relative cooling power (RCP) is about 36 J kg-1 at 5 T.
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Affiliation(s)
- Aleksandr Kulchu
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia.
- Faculty of Materials Science, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Roman A Khalaniya
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia.
| | - Andrei V Mironov
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia.
| | - Alexey V Bogach
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia.
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow 119991, Russia
| | - Sergey M Aksenov
- Laboratory of Arctic Mineralogy and Material Sciences, Kola Science Centre of RAS, Apatity 184209, Russia
- Geological Institute, Kola Science Centre of RAS, Apatity 184209, Russia
| | | | - Andrei V Shevelkov
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia.
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Meng X, Chen Z, Li J, Harrison KL, Lu W, Sun X. Editorial for focus on nanophase materials for next-generation lithium-ion batteries and beyond. NANOTECHNOLOGY 2022; 33:410201. [PMID: 34730108 DOI: 10.1088/1361-6528/ac35d2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Accepted: 10/21/2021] [Indexed: 06/13/2023]
Abstract
Lithium-ion batteries (LIBs) have revolutionized our society in many respects, and we are expecting even more favorable changes in our lifestyles with newer battery technologies. In pursuing such eligible batteries, nanophase materials play some important roles in LIBs and beyond technologies. Stimulated by their beneficial effects of nanophase materials, we initiated this Focus. Excitingly, this Focus collects 13 excellent original research and review articles related to the applications of nanophase materials in various rechargeable batteries, ranging from nanostructured electrode materials, nanoscale interface tailoring, novel separators, computational calculations, and advanced characterizations.
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Affiliation(s)
- Xiangbo Meng
- Department of Mechanical Engineering, University of Arkansas, AR 72701, United States of America
| | - Zonghai Chen
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL 60439, United States of America
| | - Jianlin Li
- Electrification and Energy Infrastructures Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States of America
| | - Katharine L Harrison
- Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, NM 87185, United States of America
| | - Wenquan Lu
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL 60439, United States of America
| | - Xueliang Sun
- Department of Mechanical and Materials Engineering, University of Western Ontario, ON N6A 6B9, Canada
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