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

Zhiping WANG, Shipai SONG, Chunzhi JIANG, Yongmin WU*, Yong XIANG*, Xiaokun ZHANG*

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Article number1169896
JournalFrontiers in Chemistry
Volume11
Early online date13 Mar 2023
DOIs
Publication statusPublished - 21 Apr 2023
Externally publishedYes

Bibliographical note

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

Keywords

  • all-solid-state lithium batteries
  • capacity
  • cathode
  • Li diffusivity
  • modeling

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