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A Long Cycle-Life High-Voltage Spinel Lithium-Ion Battery Electrode Achieved by Site-Selective Doping |
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| Authors: | Gemeng Liang Zhibin Wu Dr Christophe Didier Dr Wenchao Zhang Dr Jing Cuan Prof Baohua Li Kuan-Yu Ko Po-Yang Hung Dr Cheng-Zhang Lu Dr Yuanzhen Chen Dr Grzegorz Leniec Dr Sławomir Maksymilian Kaczmarek Dr Bernt Johannessen Dr Lars Thomsen Dr Vanessa K Peterson Dr Wei Kong Pang Prof Zaiping Guo |
| Institution: | 1. Faculty of Engineering, Institute for Superconducting & Electronic Materials, University of Wollongong, Wollongong, NSW, Australia;2. Faculty of Engineering, Institute for Superconducting & Electronic Materials, University of Wollongong, Wollongong, NSW, Australia
Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organization, Sydney, NSW, Australia;3. Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055 P. R. China;4. Industrial Technology Research Institute, Hsinchu, Taiwan) (China;5. School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049 P. R. China;6. Faculty of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology in Szczecin, Al. Piastów, 17, 70-310 Szczecin, Poland;7. Australian Synchrotron, Australian Nuclear Science and Technology Organization, 800 Blackburn Road, Clayton, Victoria, 3168 Australia |
| Abstract: | Spinel LiNi0.5Mn1.5O4 (LNMO) is a promising cathode candidate for the next-generation high energy-density lithium-ion batteries (LIBs). Unfortunately, the application of LNMO is hindered by its poor cycle stability. Now, site-selectively doped LNMO electrode is prepared with exceptional durability. In this work, Mg is selectively doped onto both tetrahedral (8a) and octahedral (16c) sites in the Fd m structure. This site-selective doping not only suppresses unfavorable two-phase reactions and stabilizes the LNMO structure against structural deformation, but also mitigates the dissolution of Mn during cycling. Mg-doped LNMOs exhibit extraordinarily stable electrochemical performance in both half-cells and prototype full-batteries with novel TiNb2O7 counter-electrodes. This work pioneers an atomic-doping engineering strategy for electrode materials that could be extended to other energy materials to create high-performance devices. |
| Keywords: | high energy density lithium-ion batteries long cycle life site-selective doping spinel cathodes |