The multiple effects of Al-doping on the structure and electrochemical performance of LiNi0.5Mn0.5O2 as cathode material at high voltage
The multiple effects of Al-doping on the structure and electrochemical performance of LiNi0.5Mn0.5O2 as cathode material at high voltage
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Al掺杂对LiNi0.5Mn0.5O2正极材料结构和高电压电化学性能的多重影响
DOI：
10.1007/s11581-018-2553-z
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发表时间：
2018-05
期刊：
影响因子：
2.8
通讯作者：
Jia Guofeng
中科院分区：
文献类型：
--
作者：
Liu Suqin;Jia Guofeng
LiNi0.5Mn0.5O2作为锂离子电池高压正极材料的应用受到循环性能差的限制。因此，我们试图通过掺杂的方法来改善这种材料在高压下的循环性能，并提出了掺杂量对结构和电化学性能的影响的详细机制。采用共沉淀法和固相法制备了LiNi 0.5-zAlzMn 0.5O2（z = 0.00，0.03，0.05，0.08）电极材料。X射线衍射和Rietveld精修表明，适量的Al掺杂可以稳定LiNi 0. 5 Mn 0. 5 O2的结构，降低Li/Ni阳离子混合，但过量的Al掺杂会导致Li层中的Al离子掺杂，阻碍Li的扩散，影响速率性能。具体地，LiNi0.47Al0.03Mn0.5O2在25 °C（在0.2C下为78.5%对68.8%）和60 °C（在0.2C下为70.8%对69.0%）下均显示出比LiNi0.5Mn0.5O2高得多的容量保持率。此外，Al的掺杂还可以抑制LiNi_（0.5-z）Al_（0.5-z）Mn_（0.5-z）O_2（z = 0.00，0.03，0.05，0.08）在充放电过程中的电压降，随着Al含量的增加，放电电压下降缓慢。
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 °C (78.5 vs. 68.8% at 0.2 C) and 60 °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.
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影响因子：
3.9
作者：
Yang Guowei;Jia Guofeng;Shangguan Xuehui;Zhu Zenghu;Peng Zhengjun;Zhuge Qin;Li Faqiang;Cui Xiaoling
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影响因子：
6.6
作者：
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影响因子：
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DOI：
10.1016/s0140-6701(02)86302-0
发表时间：
2001-07
期刊：
Fuel and Energy Abstracts
影响因子：
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作者：
F. Alessandrini
通讯作者：
F. Alessandrini