不同组分下富锂正极材料xLi2MnO3·(1-x)LiNi0.5Mn0.5O2(x=0.1-0.8)的晶体结构与电化学性能

doi:10.3866/PKU.WHXB201312252

Abstract

Abstract:

A series of lithium-rich cathode materials, xLi₂MnO₃·(1-x)LiNi_0.5Mn_0.5O₂ (x=0.1-0.8), were successfully synthesized by a sol-gel method. X-ray diffraction, scanning electron microscopy, and electrochemical tests were used to investigate the crystal structure, morphology, and electrochemical performance of the as-synthesized materials, respectively. The results showed that the materials with higher Li₂MnO₃ content had higher initial discharge capacity but poorer cycle stability, while the materials with lower Li₂MnO₃ content showed lower discharge capacity but better cycle stability, and the spinel impurity phase was also found. Based on the data, the optimal electrochemical properties were obtained when x=0.5 in xLi₂MnO₃·(1-x)LiNi_0.5Mn_0.5O₂. Moreover, the electrochemical properties were also worthy of attention when x=0.4, 0.6.

Key words: Lithium-ion battery, Cathode, Li₂MnO₃, Crystal structure, Electrochemical performance

CHEN Lai, CHEN Shi, HU Dao-Zhong, SU Yue-Feng, LI Wei-Kang, WANG Zhao, BAO Li-Ying, WU Feng. Crystal Structure and Electrochemical Performance of Lithium-Rich Cathode Materials xLi₂MnO₃·(1-x)LiNi_0.5Mn_0.5O₂ (x=0.1-0.8)[J].Acta Phys. -Chim. Sin., 2014, 30(3): 467-475.

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Crystal Structure and Electrochemical Performance of Lithium-Rich Cathode Materials xLi₂MnO₃·(1-x)LiNi_0.5Mn_0.5O₂ (x=0.1-0.8)

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Crystal Structure and Electrochemical Performance of Lithium-Rich Cathode Materials xLi2MnO3·(1-x)LiNi0.5Mn0.5O2 (x=0.1-0.8)

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Crystal Structure and Electrochemical Performance of Lithium-Rich Cathode Materials xLi₂MnO₃·(1-x)LiNi_0.5Mn_0.5O₂ (x=0.1-0.8)