法拉第效率
锂(药物)
氧化物
插层(化学)
单斜晶系
离子
电化学
材料科学
化学
无机化学
化学工程
分析化学(期刊)
结晶学
物理化学
冶金
电极
晶体结构
有机化学
医学
工程类
内分泌学
作者
Bao Qiu,Jun Wang,Yonggao Xia,Zhen Wei,Shaojie Han,Zhaoping Liu
标识
DOI:10.1016/j.jpowsour.2014.06.031
摘要
In this study we report on the temperature dependence of the initial coulombic efficiency (ICE) in Li-rich layered Li[Li0.144Ni0.136Co0.136Mn0.544]O2 oxide, consisting of rhombohedral LiNi1/3Co1/3Mn1/3O2 and monoclinic Li2MnO3 component confirmed by SXRD and SAED. The electrochemical result shows that the ICE increases from 74.6 to 91.5% with the applied charging/discharging temperature from 0 to 50 °C, and it reproducibly approaches 92% when discharged at 50 °C, regardless of the applied charging temperature. From the dQ/dV plots, it is observed that the discharging temperature significantly influences the lithium intercalation into the MnO2-like component derived from Li2MnO3 component, i.e. the discharge process determines the ICE. This phenomenon indicates that the lithium re-intercalation into the MnO2-like component appears to be the most important factor.
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