Surface topological synthesis of polymetallic oxides coatings on lithium layered oxide for improved capacity and high-rate performance

Bingyi Lu; Hao Chen; Chaoqun Guan; Hongbin Feng

doi:10.1016/j.jcis.2022.02.045

Surface topological synthesis of polymetallic oxides coatings on lithium layered oxide for improved capacity and high-rate performance

J Colloid Interface Sci. 2022 Jul:617:293-303. doi: 10.1016/j.jcis.2022.02.045. Epub 2022 Feb 14.

Authors

Bingyi Lu¹, Hao Chen¹, Chaoqun Guan¹, Hongbin Feng²

Affiliations

¹ Institute of Materials for Energy and Environment, School of Materials Science and Engineering, Qingdao University, Qingdao 266071, China.
² Institute of Materials for Energy and Environment, School of Materials Science and Engineering, Qingdao University, Qingdao 266071, China. Electronic address: fenghongbin@qdu.edu.cn.

PMID: 35278867
DOI: 10.1016/j.jcis.2022.02.045

Abstract

Surface coating of lithium layered oxide cathode (e.g., LiNi_0.5Co_0.3Mn_0.2O₂, NCM532) has become an important modified method in lithium-ion batteries for pursuing higher capacity and rate performance and safety. However, the design and synthesis of polymetallic oxide (PMO) coatings on lithium layered oxide is still a challenge. Herein, polymetallic alloys (PMA) such as NiCoMn alloys (NCM), LaZrHfMo alloys (LZHM) and LaZrHfZn alloys (LZHZ) are introduced to synthesize PMO coatings on NCM532 by a surface topological conversion strategy. The advantage of this method is that numerous kinds of elements could be converted into PMO coating layer with high reaction efficiency, element universality and uniform arrangement at atomic scale. The PMO coatings modified cathodes show excellent rate performance. All of these are attributed to the fact that the PMO coating layers can effectively reduce the side reaction with electrolyte, increase the conductivity of Li⁺ and effectively reduce the mixing of Li⁺/Ni²⁺, maintain the stability of structure, and greatly increase the reversible capacity of NCM532. Our PMO coating strategy is also applicable to other cathode materials, such as Ni-rich and Li-rich cathode materials.

Keywords: Cathode; Lithium layered oxide; Lithium-ion battery; Polymetallic oxides coatings; Surface coating.