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Enhanced electrochemical performance of layered Li-rich cathode materials for lithium ion batteries via Aluminum and Boron dual-doping
Ceramics International ( IF 5.2 ) Pub Date : 2019-03-01 , DOI: 10.1016/j.ceramint.2018.11.087
Zhongdong Peng , Kunchang Mu , Yanbing Cao , Lian Xu , Ke Du , Guorong Hu

Abstract Lithium-rich layer oxides can possess satisfactory specific capacity but suffer from severe voltage attenuation and poor cycle stability. In this work, Al-B dual-doping technique is introduced to modify Li-rich layered oxide cathode materials. Cross-section scanning electron microscopy, Energy Disperse Spectroscopy and X-ray photoelectron spectroscopy results confirm that Al and B successfully doped into the interior of the bulk Li1.2Ni0.2MnO2 particles, and the High-resolution transmission electron microscopy and X-ray diffraction Rietveld refinement results reveal that the c-axis distance of LMR-AB increases. The Al-B co-doped sample shows greatly enhanced electrochemical performance. Specifically, it exhibits of a discharge capacity of 120 mAh g−1 at 5 C and a capacity retention of 89.12% after 100 cycles at 1 C. The voltage decay is also greatly alleviated. The enhanced electrochemical performance of LMR-AB is due to the synergistic effects bought by the Al-B dual-doping, where increase of c-axis distance decreases Li+ intercalation/deintercalation barrier. B3+ doping into the tetrahedral site block the migration of TM ions and Al3+ act as pillars in the octahedral site, stabilizing the structure and suppressing the phase transition during cycling.

中文翻译:

通过铝和硼双掺杂增强锂离子电池层状富锂正极材料的电化学性能

摘要 富锂层状氧化物具有令人满意的比容量,但电压衰减严重,循环稳定性差。在这项工作中,引入了Al-B双掺杂技术来改性富锂层状氧化物正极材料。横截面扫描电子显微镜、能量色散光谱和 X 射线光电子能谱结果证实,Al 和 B 成功掺杂到 Li1.2Ni0.2MnO2 块体内部,高分辨率透射电子显微镜和 X 射线衍射Rietveld 细化结果表明 LMR-AB 的 c 轴距离增加。Al-B 共掺杂样品显示出大大增强的电化学性能。具体而言,它在 5 C 下的放电容量为 120 mAh g-1,在 1 C 下循环 100 次后容量保持率为 89.12%。电压衰减也大大减轻。LMR-AB 增强的电化学性能是由于 Al-B 双掺杂带来的协同效应,其中 c 轴距离的增加会降低 Li+ 的嵌入/脱嵌势垒。B3+ 掺杂到四面体位点阻止了 TM 离子的迁移,Al3+ 在八面体位点中充当支柱,稳定结构并抑制循环过程中的相变。
更新日期:2019-03-01
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