Improving the Electrochemical Performance of Li1.14Ni0.18Mn0.62O2 by Modulating Structure Defects via a Molten Salt Method
Improving the Electrochemical Performance of Li1.14Ni0.18Mn0.62O2 by Modulating Structure Defects via a Molten Salt Method
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熔盐法调节结构缺陷改善Li1.14Ni0.18Mn0.62O2的电化学性能
DOI：
10.1002/celc.201500390
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发表时间：
2016
期刊：
影响因子：
4
通讯作者：
Sun Shi-Gang
中科院分区：
文献类型：
--
作者：
Zhang Tao;Li Jun-Tao;Liu Jie;Deng Ya-Ping;Wu Zhen-Guo;Yin Zu-Wei;Wu Jiao-Hong;Huang Ling;Sun Shi-Gang
以KCl为熔体，采用熔盐法制备了纳米晶li1.14 ni0.18 mn0.62正极材料。研究了烧结温度和KCl与li1.14 ni0.18 mn0.62 2o的质量比对结构和电化学性能的影响。烧结温度对层状结构的形成和层错的含量有显著影响。氯化钾的用量影响材料阳离子的有序度。当KCl用量为R=4、8和12时，在800℃下得到的材料的Li+/Ni2+取代率分别为16.51%、8.39%和4.46%。随着KCl用量的增加，得到了较低的空间位阻，这与Li+扩散系数的趋势一致。本研究展示了一种控制富锂层状正极材料中Li+/Ni2+取代以提高其电化学性能的新方法。
Nanocrystalline Li1.14Ni0.18Mn0.62O2cathode materials are synthesized by a molten salt method using KCl as the molten agent. The influence of the sintering temperature and the mass ratio of KCl to Li1.14Ni0.18Mn0.62O2on the structure and electrochemical performance are investigated. The sintering temperature can markedly affect the formation of the layered structure and the content of stacking faults. The amount of KCl influences the cation ordering of the materials. The ratios of Li+/Ni2+replacement for the materials obtained at 800 °C with a KCl amount ofR=4, 8, and 12 [R=m(KCl)/m(Li1.14Ni0.18Mn0.62O2)] are 16.51, 8.39, and 4.46 %, respectively. A lower steric hindrance—related to a better cationic ordering—is obtained when the amount of KCl is increased, which is in agreement with the tendency of the Li+diffusion coefficient. This study demonstrates a new approach to control the Li+/Ni2+replacement in lithium‐rich layered cathode materials to improve their electrochemical performance.
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