期刊
CHEMICAL ENGINEERING JOURNAL
卷 415, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129042
关键词
Lithium-ion battery; Full concentration gradient lithium-rich; layered oxides; Surface spinel modification; High-temperature performance; Thermal stability
资金
- National Key Research and Development Program of China [2019YFA0705600]
- National Natural Science Foundation of China [21706261]
- Science Fund for Creative Research Groups of the National Natural Science Foundation of China [21921005]
- Hebei Natural Science Foundation [B2020103028]
The study designed a full concentration gradient lithium-rich layered oxide with spinel modification, enhancing its performance in terms of cycle stability and thermal stability. This approach has the potential to improve the practical application of LLOs.
Lithium-rich layered oxides (LLOs) are considered as the most promising candidate for the cathode of high energy density lithium-ion batteries. However, the poor cycle stability especially under high temperature is hindering its practical applications. Herein, a full concentration gradient LLO with spinel modification is designed and prepared. This synergistic strategy not only makes full use of high Ni content that improving the discharge voltage but also mitigates the detrimental influence of surface residual alkalis. The surface spinel modified cathode exhibits a higher initial coulombic efficiency of 87.52% with enhanced cycle stability at 55 ?C (191.5mAh/g after 200 cycles at 1C), the average discharge voltage drop is also alleviated to 3.17 mV per cycle (at 55 ?C). Furthermore, it also shows enhanced thermal stability, in which the exothermic onset temperature rises from 265.380 to 295.221 ?C, and the thermal release decreases from 211.525 to 181.181 J/g. This work proposes an integrated strategy to enhance the comprehensive performance of LLOs, thus shed a light on the way for its practical application.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据