A novel LiCoPO4-coated core-shell structure for spinel LiNi0.5Mn1.5O4 as a high-performance cathode material for lithium-ion batteries

作者：Liu, Yang; Lu, Zhongpei; Deng, Chenfang; Ding, Jingjing; Xu, Yue; Lu, Xiaojun; Yang, Gang^*

来源：Journal of Materials Chemistry A, 2017, 5(3): 996-1004.

DOI：10.1039/c6ta08659d

• ELECTROCHEMICAL PROPERTIES
• HIGH-ENERGY
• ANTISITE DEFECTS
• MN3+ CONTENT
• COMPOSITE
• OXIDATION

The electrochemical performance of spinel LiNi0.5Mn1.5O4 is strongly influenced by the content of Mn3+. In this work, a novel olivine LiCoPO4 shell coated structure was designed to tune the content of Mn3+ in LiNi0.5Mn1.5O4. The results indicated that after modification, LiNi0.5Mn1.5O4@ LiCoPO4 can greatly improve the electrochemical performance by inducing an appropriate amount of Mn3+. A sample containing 5 wt% LiCoPO4 addition shows the best properties delivering 137 mA h g (-1) at a current density of 0.5 degrees C and remains at 132 mA h g (- 1) with 98.5% charge/discharge efficiency after 100 cycles and 130 mA h g (-1) at a high current density of 20 degrees C, better than any other samples. This novel functional cathode material can be considered as a promising and useful choice for next generation LIB devices.

• 出版日期2017-1-21
• 单位常熟理工学院; 中国矿业大学（北京）