期刊
JOURNAL OF POWER SOURCES
卷 281, 期 -, 页码 7-10出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.01.149
关键词
Lithium-ion battery; Lithium-rich cathode material; Transition metal ion migration; Voltage decay; Charge/discharge voltage range
资金
- National Natural Science Foundation of China [21403263]
- China Postdoctoral Science Foundation [2014M551783]
- Zhejiang Province Preferential Postdoctoral scientific research project [BSH1402076]
- Ningbo Natural Science Foundation [2014A610040]
Voltage decay of Li-rich cathode material is caused by migration of transition metal (TM) ions and layered phase transformation to spinel phase. Here electrochemical studies demonstrate that charge/discharge voltage ranges have a strong impact on the voltage decay. For cells cycling in the charge/discharge condition of voltage range at 2.0-4.6 V, 3.2-4.6 V and 4.2-4.6 V, voltage decay phenomena occur to the same extent. While for the serial conditions of 2.0-4.2 V, 2.0-4.4 V, 2.0-4.6 V, 2.0-4.8 V and 2.0-4.6V + hold at 4.6 V for 5 h, voltage decay starts to occur at a typical voltage when the potential is high enough, and then phase transformation becomes severer with increased potentials, or prolonged time holding at high voltages. TM ions at high voltages have high enough energy, which can be denoted as activation energy, to stride across the transition state and migrate to Li vacancy, which results in spinet formation and voltage decay. (C) 2015 Elsevier B.V. All rights reserved.
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