Designing Polymer-in-Salt Electrolyte and Fully Infiltrated 3D Electrode for Integrated Solid-State Lithium Batteries

Wenyi Liu; Chengjun Yi; Linpo Li; Shuailei Liu; Qiuyue Gui; Deliang Ba; Yuanyuan Li; Dongliang Peng; Jinping Liu

doi:10.1002/anie.202101537

Designing Polymer-in-Salt Electrolyte and Fully Infiltrated 3D Electrode for Integrated Solid-State Lithium Batteries

Angew Chem Int Ed Engl. 2021 Jun 1;60(23):12931-12940. doi: 10.1002/anie.202101537.

Authors

Wenyi Liu¹, Chengjun Yi¹, Linpo Li², Shuailei Liu¹, Qiuyue Gui¹, Deliang Ba², Yuanyuan Li², Dongliang Peng³, Jinping Liu¹

Affiliations

¹ State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan, Hubei, 430070, P. R. China.
² School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China.
³ State Key Lab of Physical Chemistry of Solid Surface, Fujian Key Laboratory of Materials Genome, Collaborative Innovation Center of Chemistry for Energy Materials, College of Materials, Xiamen University, Xiamen, 361005, P. R. China.

PMID: 33797171
DOI: 10.1002/anie.202101537

Abstract

Solid-state lithium batteries (SSLBs) are promising owing to enhanced safety and high energy density but plagued by the relatively low ionic conductivity of solid-state electrolytes and large electrolyte-electrode interfacial resistance. Herein, we design a poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)-based polymer-in-salt solid electrolyte (PISSE) with high room-temperature ionic conductivity (1.24×10^-4 S cm^-1 ) and construct a model integrated TiO₂ /Li SSLB with 3D fully infiltration of solid electrolyte. With forming aggregated ion clusters, unique ionic channels are generated in the PISSE, providing much faster Li⁺ transport than common polymer electrolytes. The integrated device achieves maximized interfacial contact and electrochemical and mechanical stability, with performance close to liquid electrolyte. A pouch cell made of 2 SSLB units in series shows high voltage plateau (3.7 V) and volumetric energy density comparable to many commercial thin-film batteries.

Keywords: 3D electrolyte infiltration; interfacial engineering; nanostructured thin-film batteries; polymer-in-salt electrolytes; solid-state lithium batteries.

Abstract

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