电子科技大学学报2020，Vol.49Issue(1)：1-12,12.DOI:10.12178/1001-0548.2020015
原子层沉积MgO薄膜改性LiNi0.6Co0.2Mn0.2O2
Atomic Layer Deposition of Ultrathin MgO Coating onto LiNi0.6Co0.2Mn0.2O2
摘要
Abstract
As one of the most promising cathode materials for high energy density lithium ion batteries,LiNi0.6Co0.2Mn0.2O2 with high reversible capacity suffers poor cycling performances,especially at high cutoff potentials.To address this challenge,in this study,an atomic layer deposition is utilized to design controllable MgO coating layers onto LiNi0.6Co0.2Mn0.2O2 cathode material.It is confirmed that the optimized LiNi0.6Co0.2Mn0.2O2 cathode shows an improved electrochemical performance comparing with the pristine material at the cutoff potentials of 4.5 V as well as 4.7 V.After 100 cycles,the LiNi0.6Co0.2Mn0.2O2 with MgO coating displays the reversible capacities of 157 mAh·g-1 and 158 mAh·g-1 at the cutoff potential of 4.5 V and 4.7 V,respectively,which is higher than those of the pristine one (131 mAh·g-1 and 144 mAh·g-1).This study demonstrates that the ALD derived MgO coating layer shows some promising potentials to improve LiNi0.6C00.2Mn0.2O2 performance for lithium ion batteries.This is mainly due to the effective protection of MgO layer to the material surface,that is,the MgO coating can stabilize the interface and block the metal ion dissolution by reducing the direct connection between LiNi0.6Co0.2Mn0.2O2 and electrolyte.关键词
原子层沉积/氧化镁薄膜/锂离子电池正极材料Key words
atomic layer deposition/MgO film/lithium ion battery cathode material分类
通用工业技术引用本文复制引用
寇华日,李喜飞,刘文,鄯慧,颜波,丁书江..原子层沉积MgO薄膜改性LiNi0.6Co0.2Mn0.2O2[J].电子科技大学学报,2020,49(1):1-12,12.基金项目
National Natural Science Foundation of China (51572194)国家自然科学基金(51572194)This research was supported by Academic Innovation Funding of Tianjin Normal University (52XC1404) and Training Plan of Leader Talent of University in Tianjin. （51572194）
