Stabilizing the structure and suppressing the voltage decay of Li[Li0.2Mn0.54Co0.13Ni0.13]O2 cathode materials for Li-ion batteries via multifunctional Pr oxide surface modification |
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| Affiliation: | 1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, No. 30 College Road, Haidian District, Beijing, 100083 China;2. Lab of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084 China;1. College of Chemical Engineering, Sichuan University, Chengdu 610065, China;2. College of Energy, Xiamen University, Xiamen 361005, China;3. College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China;1. China Aviation Lithium Battery Co. Ltd., Luoyang 471003, China;2. School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, China;3. College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, China;1. Department of Advanced Technology Fusion, Graduate School of Science and Engineering, Saga University, Honjo-1 840-8520, Saga, Japan;2. Nissan Research Center, Nissan Motor Co., Ltd., Natsushima-cho, Yokosuka 237-8523, Kanagawa, Japan;1. Department of Energy Engineering, Hanyang University, Seoul 133-791, South Korea;2. Department of Nano Engineering, Sejong University, Seoul 143-747, South Korea;3. Department of Chemistry, Bar-Ilan University, Ramat-Gan 5290002, Israel;1. Helmholtz Institute Ulm (HIU), Electrochemistry I, Helmholtzstr. 11, 89081 Ulm, Germany;2. Karlsruhe Institute of Technology (KIT), P.O. Box 3640, 76021 Karlsruhe, Germany;1. Department of Energy Engineering, Hanyang University, Seoul, 04763, Republic of Korea;2. Center for Energy Convergence, Green City Technology Institute, Korea Institute of Science and Technology, Hwarangno 14 gil 5, Seongbuk-gu, Seoul, 136-791, Republic of Korea |
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| Abstract: | The development of Li-rich layer cathode materials has been limited by poor cycle, rate performance, phase transformation and voltage decay. To improve these properties, a facile and low-cost wet method is employed to fabricate Pr6O11 coating layer on LiLi0.2Mn0.54Co0.13Ni0.13]O2 nanoparticles. The 3–6 nm Pr6O11 coating layer is observed on the surface of LiLi0.2Mn0.54Co0.13Ni0.13]O2 by HRTEM. Interestingly, HAADF-STEM and EDS analyses show that the transition metal ions and the praseodymium ions mutually infiltrate in the Pr6O11 coating layer and LiLi0.2Mn0.54Co0.13Ni0.13]O2 nanoparticles during calcination. A combination of HAADF-STEM with EDS and XPS studies reveals that Pr6O11 coating layer is bridged to LiLi0.2Mn0.54Co0.13Ni0.13]O2 nanoparticles by the chemical bonds of transition phase Li1.2MXPr1?xO2. XRD patterns show that all samples are indexed to the layered structure α-NaFeO2, but the lattice parameters are influenced lightly after Pr6O11 coating. HRTEM and SAED analyses elucidate that the super large Pr ions surface-doping and the Pr6O11 coating are verified to suppress the transformation of layer to spinel structure in the bulk nanoparticles after cycles. The sample coated with 3 wt% Pr6O11 exhibits wonderful electrochemical performance with the first coulomb efficiency of 85.6%, the capacity retention ratio of 97.9% after 50 cycles and the discharge capacity of 162.2 mAh g?1 at 5 C. The resistant of charge transfer and the electrodes polarization are reduced by Pr6O11 coating according to EIS. Therefore, Pr6O11, which contains the super large Pr ions, plays two roles: the first one, it is coated on the LiLi0.2Mn0.54Co0.13Ni0.13]O2 nanoparticles to optimize the environment of the interface reaction between electrodes and electrolyte; the other one, its Pr ions surface-doping stabilizes the structure in the superficial region of LiLi0.2Mn0.54Co0.13Ni0.13]O2 nanoparticles and suppresses the voltage decay. The multifunctional Pr6O11 can play a significant role in accelerating development of new materials with excellent stabilization and high capacity. |
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| Keywords: | Super large Pr ions surface-doping Stabilizing the structure Suppressing the voltage decay |
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