Effects of Li+ conduction on the capacity utilization of cathodes in all-solid-state lithium batteries

Frontiers in Chemistry

Chemistry

Zhiping Wang¹  Xiaokun Zhang¹  Shipai Song¹  Chunzhi Jiang¹  Yong Xiang²  Yongmin Wu³ 

[1] School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, Sichuan, China;School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, Sichuan, China;Advanced Energy Research Institute, University of Electronic Science and Technology of China, Chengdu, Sichuan, China;Sichuan Provincial Engineering Research Center of Flexible Display Material Genome, University of Electronic Science and Technology of China, Chengdu, Sichuan, China;State Key Laboratory of Space Power-sources Technology, Shanghai Institute of Space Power-sources, Shanghai, China;

关键词: all-solid-state lithium batteries;    cathode;    capacity;    Li diffusivity;    modeling;   

DOI  :  10.3389/fchem.2023.1169896

 received in 2023-02-20, accepted in 2023-03-13,  发布年份 2023

来源: Frontiers

【 摘 要 】

Li+ conduction in all-solid-state lithium batteries is limited compared with that in lithium-ion batteries based on liquid electrolytes because of the lack of an infiltrative network for Li+ transportation. Especially for the cathode, the practically available capacity is constrained due to the limited Li+ diffusivity. In this study, all-solid-state thin-film lithium batteries based on LiCoO2 thin films with varying thicknesses were fabricated and tested. To guide the cathode material development and cell design of all-solid-state lithium batteries, a one-dimensional model was utilized to explore the characteristic size for a cathode with varying Li+ diffusivity that would not constrain the available capacity. The results indicated that the available capacity of cathode materials was only 65.6% of the expected value when the area capacity was as high as 1.2 mAh/cm2. The uneven Li distribution in cathode thin films owing to the restricted Li+ diffusivity was revealed. The characteristic size for a cathode with varying Li+ diffusivity that would not constrain the available capacity was explored to guide the cathode material development and cell design of all-solid-state lithium batteries.

【 授权许可】

Unknown   
Copyright © 2023 Wang, Song, Jiang, Wu, Xiang and Zhang.