Nano-Y2O3-coated LiNi0.5Co0.2Mn0.3O2 cathodes with enhanced electrochemical stability under high cut-off voltage and high temperature

作者：Xu, Junna; Chen, Xiaoqing; Wang, Chunhui; Yang, Lishan^*; Gao, Xiong; Zhou, Youyuan; Xiao, Kesong; Xi, Xiaoming^*

来源：Ceramics International, 2017, 43(15): 11848-11854.

DOI：10.1016/j.ceramint.2017.06.028

• Lithium ion batteries
• LiNi0.5Co0.2Mn0.3O2
• Surface coating
• Y2O3
• High voltage
• High temperature

LiNi0.3Co0.2Mn0.3O2 (523) coated with similar to 20 nm thick Y2O3 nano-membrane is prepared via a sol-type chemical precipitation process based on electrostatic attraction between the materials. The nano-Y2O3-coated 523 cathode can deliver 160.3 mA h g(-1) (87.8% of its initial discharge capacity) after 50 cycles at 1 C (180 mA g(-1)) between 3.0 and 4.6 V by coin cell testing, while the pristine 523 keeps only 146.2 mA h g(-1) with 78.6% capacity retention left. The capacity retention rate increases from 50% to 86.7% after 150 cycles at 1 C in 3.0-4.35 V by soft package testing under 45 degrees C. Through this novel Y2O3 coating operation, both the charge transfer resistance and the electrode polarization of the 523 electrode have been suppressed, and its structure stability is also improved.

• 出版日期2017-10-15
• 单位中南大学; 湖南师范大学