In Situ Coating of Li7P3S11 Electrolyte on CuCo2S4/Graphene Nanocomposite as a High-Performance Cathode for All-Solid-State Lithium Batteries

Liangting Cai; Hongli Wan; Qiang Zhang; Jean Pierre Mwizerwa; Xiaoxiong Xu; Xiayin Yao

doi:10.1021/acsami.0c09295

In Situ Coating of Li₇P₃S₁₁ Electrolyte on CuCo₂S₄/Graphene Nanocomposite as a High-Performance Cathode for All-Solid-State Lithium Batteries

ACS Appl Mater Interfaces. 2020 Jul 29;12(30):33810-33816. doi: 10.1021/acsami.0c09295. Epub 2020 Jul 14.

Authors

Liangting Cai¹, Hongli Wan^{1

2}, Qiang Zhang^{1

2}, Jean Pierre Mwizerwa^{1

2}, Xiaoxiong Xu^{3

4}, Xiayin Yao^{1

2}

Affiliations

¹ Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China.
² Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
³ Zhejiang Funlithium New Energy Technology Co., Ltd., Ningbo 315201, P. R. China.
⁴ Ganfeng Lithium Co., Ltd., Xinyu 338015, P. R. China.

PMID: 32662624
DOI: 10.1021/acsami.0c09295

Abstract

A cathode material, CuCo₂S₄/graphene@10%Li₇P₃S₁₁, is reported for all-solid-state lithium batteries with high performance. The electrical conductivity of CuCo₂S₄ is improved by compounding with graphene. Meanwhile, Li₇P₃S₁₁ electrolyte is coated on the surface of CuCo₂S₄/graphene nanosheets to build an intimate contact interface between the solid electrolyte and the electrode effectively, facilitating lithium-ion conduction. Benefitting from the balanced and efficient electronic and ionic conductions, all-solid-state lithium batteries using CuCo₂S₄/graphene@10%Li₇P₃S₁₁ composite as cathode materials demonstrate superior cycling stability and rate capabilities, exhibiting an initial discharge specific capacity of 1102.25 mAh g^-1 at 50 mA g^-1 and reversible capacity of 556.41 mAh g^-1 at a high current density of 500 mA g^-1 after 100 cycles. These results demonstrate that the CuCo₂S₄/graphene@10%Li₇P₃S₁₁ nanocomposite is a promising active material for all-solid-state lithium batteries with superior performances.

Keywords: CuCo2S4/graphene@10Li7P3S11 nanocomposite; all-solid-state lithium batteries; electrochemical performance; electronic conductivity; ionic conductivity.