Preparation and Performance Study on Synergistically Modified Lithium-rich Manganese-based Cathode Material with Surface Coating and Ion Anchoring
ZHANG Kangjin1,2,†, CHEN Huai1,2,†, MA Jun1,2,*
1 College of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550000, China 2 Guizhou Provincial Key Laboratory of Green Chemical and Clean Energy Technology, Guizhou University, Guiyang 550000, China
Abstract: Lithium-rich manganese layered oxides(LLOs) are considered as ideal cathode candidates for high-energy-density lithium-ion batteries. Ho-wever, the lower initial coulombic efficiency, capacity/voltage decay, poorer rate and cycle performance of LLOs hinder their practical application. A large number of studies have shown that surface modification of LLOs is an effective means to improve the electrochemical performance of LLOs. In view of this, LLOs (PPLLOs) coated with PVA and PAA cross-linked organic coatings were obtained by modifying LLOs with polyvinyl alcohol (PVA) and polyacrylic acid (PAA). The electrochemical performance test indicates that the reversible specific capacities of LLOs and PPLLOs-5 after 100 cycles at 1C are 152.9 mAh·g-1 and 175.2 mAh·g-1, respectively, and the capacity retention rates are 79% and 90.5%, respectively. The improvement of this performance is due to the fact that the organic coating can alleviate the unevenly accumulated stress caused by the repeated deintercalation of lithium ions during the electrochemical cycle of LLOs, inhibit the interfacial side reactions, and improve the structural stability of LLOs. The hydrogen bond network anchored the transition metal ions in the surface phase of LLOs, which inhibited the migration and dissolution of transition metal ions in LLOs during the electrochemical cycle. This work provides new insights into the surface modification of LLOs.
张康进, 陈槐, 马俊. 表面涂层协同离子锚定改性富锂锰基正极材料及其性能研究[J]. 材料导报, 2026, 40(10): 25040191-6.
ZHANG Kangjin, CHEN Huai, MA Jun. Preparation and Performance Study on Synergistically Modified Lithium-rich Manganese-based Cathode Material with Surface Coating and Ion Anchoring. Materials Reports, 2026, 40(10): 25040191-6.
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