Investigation of the Effect of Extra Lithium Addition and Postannealing on the Electrochemical Performance of High-Voltage Spinel LiNi0.5Mn1.5O4 Cathode Material
Investigation of the Effect of Extra Lithium Addition and Postannealing on the Electrochemical Performance of High-Voltage Spinel LiNi0.5Mn1.5O4 Cathode Material
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DOI：
10.1021/jp503584k
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发表时间：
2014-07
影响因子：
3.7
通讯作者：
Yunxian Qian;Yuanfu Deng;Lina Wan;Hongjie Xu;Xusong Qin;Guohua Chen
中科院分区：
文献类型：
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作者：
Yunxian Qian;Yuanfu Deng;Lina Wan;Hongjie Xu;Xusong Qin;Guohua Chen
LiNi0.5Mn1.5O4（LNMO）尖晶石是下一代锂离子电池的有吸引力的阴极候选者，因为它提供高功率和能量密度。本文研究了锂的添加量和退火工艺对球形LNMO材料的物理化学和电化学性能的影响。结果表明，锂的加入量和退火工艺对球形LNMO正极材料的Mn 3+含量、相杂质（岩盐相）和相结构（Fd 3 m和P4332）有显著影响，从而影响其电化学性能。特别是，发现从Fd 3 m到P4332的相变和LNMO尖晶石的Mn 3+含量通过锂添加和退火后过程来调节。由于Mn ~（3+）的存在、杂质相（岩盐相）的不存在以及尖晶石中阳离子的有序化，使得产物的电化学速率性能和容量保持率显著提高。
The LiNi0.5Mn1.5O4 (LNMO) spinel is an attractive cathode candidate for next generation lithium-ion batteries as it offers high power and energy density. In this paper, the effects of extra amounts of lithium addition and postannealing process on the physicochemical and electrochemical properties of the spherical LNMO material were investigated. The experimental results show that the amount of lithium and the postannealing process have significant impacts on the Mn3+ content, phase impurity (rock-salt phase) and phase structures (Fd3m and P4332) of the spherical LNMO cathode materials, so as their electrochemical performance. In particular, the phase transition from Fd3m to P4332 and the Mn3+ content of the LNMO spinels were found to be adjusted by lithium additions and the postannealing process. With the presence of Mn3+, the absence of the impurity phase (rock-salt phase) and the cation ordering in the spinels, the electrochemical rate performance and capacity retention of the products could be signific...