尖晶石
共沉淀
结晶度
材料科学
涂层
化学工程
电化学
锂(药物)
电池(电)
扩散
阴极
功率密度
复合材料
冶金
功率(物理)
化学
电极
热力学
物理化学
内分泌学
工程类
物理
医学
作者
Shiyou Li,Wenbiao Liang,Jing Xie,Wei Yuan,Xiaoling Cui
出处
期刊:Journal of electrochemical energy conversion and storage
[ASME International]
日期:2020-01-11
卷期号:17 (3)
被引量:12
摘要
Abstract Spinel LiNi0.5Mn1.5O4 (LNMO) has become one of the most practical power lithium-ion battery cathode materials due to its advantages of three-dimensional Li+ diffusion channel, higher potential window (3.5–5V), high-energy density (∼660 Wh/kg), and high-power density. In this manuscript, a hollow spherical LNMO material with large size and high crystallinity is prepared by a modified coprecipitation method using ethyl alcohol as a peptizator. Subsequently, the prepared LNMO material is further modified by an Al2O3 coating to improve its cycle stability. Results show that the initial discharge-specific capacity of LNMO material with 1 wt% Al2O3 coating is 133.7 mAh g−1 at 0.2 C rate, and the capacity retention rate is 97.7% after 100 cycles. The effective increase in the cycle life of the battery can be attributed to the uniform and dense Al2O3 coating on the surface of the material.
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