| The multiple effects of Al-doping on the structure and electrochemical performance of LiNi0.5Mn0.5O2 as cathode material at high voltage | |
Jia, Guofeng ; Liu, Suqin; Yang, Guowei; Li, Faqiang; Wu, Kang; He, Zhen; Shangguan, Xuehui
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| 2018-12 | |
| 发表期刊 | IONICS
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| ISSN | 0947-7047 |
| 卷号 | 24期号:12页码:3705-3715 |
| 摘要 | The application of LiNi0.5Mn0.5O2 as a high-voltage cathode material for lithium-ion batteries is limited by its poor cycle performance. Therefore, we attempt to improve the cyclability of this material at high voltage by using a doping method and propose a detailed mechanism for the effect of the doping amount on the structure and electrochemical performance. In this work, LiNi0.5-zAlzMn0.5O2 (z=0.00, 0.03, 0.05, 0.08) electrodes were prepared via a simple co-precipitation followed by a solid-state method. X-ray diffraction and Rietveld refinement revealed that a suitable amount of Al doping into LiNi0.5Mn0.5O2 can stabilize the structure and lower the Li/Ni cation mixing, but an excessive doping would lead to Al-ion doping in the lithium layer, which can block lithium diffusion and affect the rate property. Specifically, LiNi0.47Al0.03Mn0.5O2 shows a much higher capacity retention compared to LiNi0.5Mn0.5O2 both at 25 degrees C (78.5 vs. 68.8% at 0.2 C) and 60 degrees C (70.8 vs. 69.0% at 0.2 C). Moreover, Al-doping can retard the voltage drop during the discharge-charge state, with the discharge voltage for LiNi0.5-zAlzMn0.5O2 (z=0.00, 0.03, 0.05, 0.08) decreasing slowly with increasing Al content. |
| DOI | 10.1007/s11581-018-2553-z |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.isl.ac.cn/handle/363002/34497 |
| 专题 | 盐湖资源与化学实验室 |
| 推荐引用方式 GB/T 7714 | Jia, Guofeng,Liu, Suqin,Yang, Guowei,et al. The multiple effects of Al-doping on the structure and electrochemical performance of LiNi0.5Mn0.5O2 as cathode material at high voltage[J]. IONICS,2018,24(12):3705-3715. |
| APA | Jia, Guofeng.,Liu, Suqin.,Yang, Guowei.,Li, Faqiang.,Wu, Kang.,...&Shangguan, Xuehui.(2018).The multiple effects of Al-doping on the structure and electrochemical performance of LiNi0.5Mn0.5O2 as cathode material at high voltage.IONICS,24(12),3705-3715. |
| MLA | Jia, Guofeng,et al."The multiple effects of Al-doping on the structure and electrochemical performance of LiNi0.5Mn0.5O2 as cathode material at high voltage".IONICS 24.12(2018):3705-3715. |
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