Effect of N/P ratios on the performance of LiNi0.8Co0.15Al0.05O2∥SiOx/Graphite lithium-ion batteries
Effect of N/P ratios on the performance of LiNi0.8Co0.15Al0.05O2∥SiOx/Graphite lithium-ion batteries
复制标题
N/P比对LiNi0.8Co0.15Al0.05O2||SiOx/石墨锂离子电池性能的影响
DOI：
10.1016/j.jpowsour.2019.227056
复制
发表时间：
2019-11-01
影响因子：
9.2
通讯作者：
Zhang, Suojiang
中科院分区：
文献类型：
--
作者：
Chen, Zhan;Zhang, Lan;Zhang, Suojiang
Silicon is considered as a promising anode material to improve the energy density of lithium ion batteries. However, the huge capacity loss in the initial cycles not only consumes the active Li from the cathode, but also shows great influence on the long-term cycle stability for the varied negative/positive capacity ratio (N/P ratio) that may lead to over-charge/discharge, thus hinders silicon from commercial application. Therefore, it's of vital importance to study the N/P ratio to realize the tradeoff between initial coulombic efficiency (ICE) and cycling stability. LiNi0.8Co0.15Al0.05O2 parallel to SiOx/Graphite pouch cells with different N/P ratios between 0.85 and 1.8 are designed and prepared in this paper, electrochemical tests prove that a N/P ratio close to unity provide the best balance between energy density and cycle performance. Moreover, capacity decay mechanisms in cathode and anode are carefully studied, which demonstrates that up to 90% of the capacity loss is due to the active Li host sites loss in anode, while the crosstalk between the two electrodes also must be considered.
