Improving cycling performance and rate capability of Ni-rich LiNi0.8Co0.1Mn0.1O2 cathode materials by Li4Ti5O12 coating
Improving cycling performance and rate capability of Ni-rich LiNi0.8Co0.1Mn0.1O2 cathode materials by Li4Ti5O12 coating
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Li4Ti5O12涂层提高富镍LiNi0.8Co0.1Mn0.1O2正极材料的循环性能和倍率性能
DOI：
10.1016/j.electacta.2018.02.049
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发表时间：
2018-04-01
影响因子：
6.6
通讯作者：
Zhong, Ben-He
中科院分区：
文献类型：
--
作者：
Xu, Ya-Di;Xiang, Wei;Zhong, Ben-He
采用湿化学法在富镍LiNi0.8Co0.1Mn0.1O2表面包覆了锂离子导电材料Li 4 Ti 5 O 12。物化表征结果表明，Li 4 Ti 5 O 12均匀分布在微球表面，厚度约为2-3 nm，微球的结构和形貌未发生明显变化。电化学测试结果表明，适当含量的Li 4 Ti 5 O 12包覆层可以提高锂离子的扩散速率，抑制电极与电解液之间的副反应，从而显著改善富镍LiNi0.8Co0.1Mn0.1O2的循环性能和倍率性能。值得注意的是，1wt%Li4Ti5O12涂覆的样品表现出优异的循环稳定性，当在25 ℃下在2.7和4.3V之间循环时，在1C下170次循环后的容量保持率为75.86%，而对于裸LiNi0.8Co0.1Mn0.1O2仅为39.40%。(c)2018爱思唯尔有限公司版权所有
A simple wet chemical process followed by high temperature calcination has been successfully used to coat Li-ion conductive Li4Ti5O12 on the surface of Ni-rich LiNi0.8Co0.1Mn0.1O2. Physicochemical characterization results indicate that a Li4Ti5O12 with a thickness of about 2-3 nm was uniformly distributed on the surface of microspheres, without inducing significant change of the structure and morphology. Electrochemical test results show that proper content of Li4Ti5O12 coating layer can greatly improve the cycling performance and rate capability of Ni-rich LiNi0.8Co0.1Mn0.1O2 for the improved Li+ ions diffusion rate and suppressed side reactions between electrode and electrolyte. Notably, the 1 wt% Li4Ti5O12 coated sample exhibits excellent cycling stability with the capacity retention of 75.86% at 1 C after 170 cycles when cycled between 2.7 and 4.3 V at 25 degrees C, while that is only 39.40% for bare LiNi0.8Co0.1Mn0.1O2. (c) 2018 Elsevier Ltd. All rights reserved.