Composite Cathodes with Succinonitrile-Based Ionic Conductors for Long-Cycle-Life Solid-State Lithium Metal Batteries

Chengzhou XIN, Kaihua WEN, Chuanjiao XUE, Shuo WANG, Ying LIANG, Xinbin WU, Liangliang LI*, Ce Wen NAN

*Corresponding author for this work

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

4 Citations (Scopus)

Abstract

Poor interfacial contacts between cathode active materials and solid-state electrolytes in solid-state lithium (Li) metal batteries often lead to a poor Li-ion conductive pathway, and thus a short cycle life and a low energy density. In this work, we synthesized succinonitrile (SCN)-based ionic conductors (ICs) with different flowability at room temperature for using in the composite cathodes and investigated the effect of the ICs on the cycle performance of the solid-state Li metal batteries with a poly(vinylidene fluoride) (PVDF)-based polymer electrolyte separator. Our results showed that the gel-like SCN-LiClO4 IC was superior to the flowable SCN-LiTFSI [lithium bis(trifluoromethanesulfonyl)imide] IC and the rigid SCN-LiClO4 IC. The gel-like IC can build an effective Li-ion conduction path in the cathodes, establish a stable cathode/electrolyte interface with a small interfacial resistance change during cycling, and allow a high mass loading of active materials, which enables a long cycle life and high energy density of solid-state batteries.

Original languageEnglish
Article numbere202100162
JournalBatteries and Supercaps
Volume5
Issue number1
Early online date7 Sept 2021
DOIs
Publication statusPublished - Jan 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2021 Wiley-VCH GmbH

Funding

This work was supported by the basic science center program of National Natural Science Foundation of China (Grant no. 51788104) and Tsinghua-Foshan Innovation Special Fund (Grant no. 2018THFS0409).

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