Enhanced Cathode Performance: The Heterostructure Construction of LiCoO2@Co3O4@Li6.4La3Zr1.4Ta0.6O12

Yue Leng; Shengde Dong; Yanxia Sun; Luxiang Ma; Jinyao Li; Hang Feng; Chunxi Hai; Yuan Zhou

doi:10.1021/acs.langmuir.3c03794

Enhanced Cathode Performance: The Heterostructure Construction of LiCoO₂@Co₃O₄@Li_6.4La₃Zr_1.4Ta_0.6O₁₂

Langmuir. 2024 Mar 26;40(12):6295-6303. doi: 10.1021/acs.langmuir.3c03794. Epub 2024 Mar 14.

Authors

Yue Leng^{1

2}, Shengde Dong^{1

2}, Yanxia Sun¹, Luxiang Ma^{1

2}, Jinyao Li¹, Hang Feng¹, Chunxi Hai^{1

2}, Yuan Zhou^{1

2}

Affiliations

¹ College of Materials and Chemistry and Chemical Engineering, Chengdu University of Technology, Sichuan 610059, China.
² Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institution, Chengdu University of Technology, Sichuan 610059, China.

PMID: 38484330
DOI: 10.1021/acs.langmuir.3c03794

Abstract

In this study, the heterostructure cathode material LiCoO₂@Co₃O₄@Li_6.4La₃Zr_1.4Ta_0.6O₁₂ was prepared by coating Li_6.4La₃Zr_1.4Ta_0.6O₁₂ on the surface of LiCoO₂ through a one-step solid-phase synthesis. The morphology, structure, electrical state, and elemental contents of both pristine and modified materials were assessed through a range of characterization techniques. Theoretical calculations revealed that the LCO@LLZTO material possessed a reduced diffusion barrier compared to LiCoO₂, thereby facilitating the movement of Li ions. Electrochemical tests indicated that the capacity retention rate of the modified cathode composites stood at 70.43% following 300 cycles at a 2C rate. This high rate occurred because the Li_6.4La₃Zr_1.4Ta_0.6O₁₂ film on the surface enhanced the migration of Li⁺, and the spinel phase of Co₃O₄ had better interfacial stability to alleviate the generation of microcracks by inhibiting the phase change from the layered phase to the rock-salt phase, which considerably improved the electrochemical properties.