Threefold Modification with Dual-Cation Doping and LiVO3 Coating Boosts Long-Term Cyclability and Rate Capability of Li-Rich Cathode Materials for Lithium-Ion Batteries

作者：Qu, Yifan; Tang, Weijian; Liu, Honglei; Li, Cong; Zou, Lei; Chen, Zhangxian; Yang, Zeheng; Su, Jianhui; Zhang, Weixin^*

来源：Industrial and Engineering Chemistry Research, 2023, 62(27): 10467-10476.

DOI：10.1021/acs.iecr.3c00889

• PERFORMANCE
• STABILITY
• LAYER

Li-rich cathode materials are attracting widespread attentionowingto their advantages such as high specific capacity and operating voltage.However, irreversible lattice oxygen loss and structural distortionhinder their further commercial application. Herein, a threefold modificationstrategy with LiVO3 surface coating and Na and V dual-cationdoping has been utilized to boost the electrochemical performanceof Li-rich oxides Li1.2Mn0.54Co0.13Ni0.13O2, which is achieved simply by introducingNaVO(3) treatment. The LiVO3 surface coating preventsinterfacial side reactions, promotes Li-ion diffusion kinetics inthe interphase, and inhibits irreversible O-2 release. Additionally,the Na and V dual-cation doping in the bulk can also contribute toboosting Li-ion transfer and restrain irreversible O-2 evolution.Na-ion doping with the pillar effect expands the lattice space forfaster Li-ion intercalation/deintercalation, and V-ion doping by formingstronger V-O bonds further strengthens structural stability.Therefore, the treated Li-rich sample exhibits extended cycle durabilityand stable voltage stability, with an 82.4% capacity retention rateafter 250 cycles and an average voltage fading of 2.4 mV per cycleat 2 C. Moreover, a pouch cell based on the modified Li1.2Mn0.54Co0.13Ni0.13O2@LiVO3 cathode presents an outstanding cyclability, maintaining80.4% of its initial capacity after 400 cycles at 1 C. Our resultsdemonstrate a promising strategy for addressing the issues of Li-richcathode materials.