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锰基富锂正极材料Li1.2Ni0.2Mn0.59Co0.01O2的首次充放电曲线分析
作者:刘燕燕1 刘道坦2 陈立泉1 
单位:1. 中国科学院物理研究所 北京 100190 2. 中国电力科学研究院 北京 100192 
关键词:锰基富锂正极材料 Coulomb效率 充放电行为 充放电曲线 
分类号:TM 912
出版年,卷(期):页码:2015,43(1):8-13
DOI:DOI:10.14062/j.issn.0454-5648.2015.01.02
摘要:

 采用溶胶−凝胶法制备了锰基富锂正极材料Li1.2Ni0.2Mn0.59Co0.01O2。在类似的实验条件下制备了3组样品。分别用3组共计13个样品作为正极、金属锂作为负极制备了扣式电池以研究其首次充放电曲线和Coulomb效率。发现首次充电时平台容量(CP)占总充电容量(CT)的比例为首次Coulomb效率的曲线函数。而首次放电时,在3.5 V两侧均有1个放电平台,其微分容量曲线(dQ/dU)中2个峰的峰值比(PB/PC)为首次Coulomb效率的线性函数。通过分析,提出一个模型来解释锰基富锂材料的首次充放电行为。

 
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  Manganese-based lithium-rich cathode materials Li1.2Ni0.2Mn0.59Co0.01O2 were prepared via a sol−gel method. Three groups of coin cells were assembled with Li1.2Ni0.2Mn0.59Co0.01O2 as the cathode and metal lithium as the anode. The 13 cells were cycled galvanostatically between 2.0–4.8 V, and the first cycle curves were analyzed. The ratio of the high voltage charging plateau capacity (CP) to the total charge capacity (CT) is a Gauss faction of the Coulomb efficiency of the first cycle. In the differential (dQ/dU) curves of the discharge process, there are two peaks, named PB and PC, respectively. The ratio of P B/PC is a linear faction of the Coulomb efficiency of the first cycle. A model was proposed to explain the electrochemical behavior of the first cycle for the cathode material of Li1.2Ni0.2Mn0.59Co0.01O2.

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基金项目:
作者简介:
第一作者:刘燕燕(1977—),女,博士,副主任工程师。
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参考文献:

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