Lithium-Ion Conductor Li2ZrO3-Coated Primary Particles To Optimize the Performance of Li-Rich Mn-Based Cathode Materials

Jiarui Chen; Shuang Cao; Zhi Li; Heng Li; Changmeng Guo; Ruijuan Wang; Lei Wu; Yixu Zhang; Yansong Bai; Xianyou Wang

doi:10.1021/acsami.3c07453

Lithium-Ion Conductor Li₂ZrO₃-Coated Primary Particles To Optimize the Performance of Li-Rich Mn-Based Cathode Materials

ACS Appl Mater Interfaces. 2023 Aug 2;15(30):36394-36403. doi: 10.1021/acsami.3c07453. Epub 2023 Jul 21.

Authors

Jiarui Chen¹, Shuang Cao¹, Zhi Li¹, Heng Li¹, Changmeng Guo¹, Ruijuan Wang¹, Lei Wu¹, Yixu Zhang¹, Yansong Bai¹, Xianyou Wang¹

Affiliation

¹ National Base for International Science & Technology Cooperation, National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery, Hunan Province Key Laboratory of Electrochemical Energy Storage & Conversion, School of Chemistry, Xiangtan University, Xiangtan 411105, China.

PMID: 37479676
DOI: 10.1021/acsami.3c07453

Abstract

A lithium-rich manganese-based cathode material (LRMC) is currently considered as one of the most promising next-generation materials for lithium-ion batteries, which has received much attention, but the LRMC still faces some key scientific issues to break through, such as poor rate capacity, rapid voltage, capacity decay, and low first coulomb efficiency. In this work, homogeneous Li₂ZrO₃ (LZO) was successfully coated on the surface of Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ (LRO) by molten salt-assisted sintering technology. Li₂ZrO₃ has good chemical and electrochemical stability, which can effectively inhibit the side reaction between electrode materials and electrolytes and reduce the dissolution of transition metal ions. Thus, the as-prepared LRO@LZO composites are expected to improve the cycling performance. It can be found that the discharge specific capacity of LRO is 271 mAh g^-1 at 0.1 C, and the capacity retention rate is still 93.7% after 100 cycles at 1 C. In addition, Li₂ZrO₃ is an excellent lithium-ion conductor, which is prone to increasing the lithium-ion transfer rate and improving the rate capacity of LRO. Therefore, this study provides a new solution to improve the structure stability and electrochemical performance of LRMCs.

Keywords: capacity retention; lithium-ion battery; lithium-rich manganese-based cathode materials; molten salt-assisted sintering technology; primary particle coating.