An integrated cathode and solid electrolyte via in situ polymerization with significantly reduced interface resistance

Jialiang Yuan; Ran Dong; Yuan Li; Yang Liu; Zhuo Zheng; Yuxia Liu; Yan Sun; Benhe Zhong; Zhenguo Wu; Xiaodong Guo

doi:10.1039/d1cc04485k

An integrated cathode and solid electrolyte via in situ polymerization with significantly reduced interface resistance

Chem Commun (Camb). 2021 Dec 3;57(96):13004-13007. doi: 10.1039/d1cc04485k.

Authors

Jialiang Yuan¹, Ran Dong¹, Yuan Li¹, Yang Liu², Zhuo Zheng³, Yuxia Liu⁴, Yan Sun⁵, Benhe Zhong¹, Zhenguo Wu¹, Xiaodong Guo¹

Affiliations

¹ School of Chemical Engineering, Sichuan University, Chengdu, 610065, China. zhenguowu@scu.edu.cn.
² School of Materials Science and Engineering, Henan Normal University, XinXiang, 453007, China. liuyang20208@htu.edu.cn.
³ The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, 610065, P. R. China.
⁴ The Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, China.
⁵ School of Mechanical Engineering, Chengdu University, Chengdu, 610106, China. sunyan@cdu.edu.cn.

PMID: 34806094
DOI: 10.1039/d1cc04485k

Abstract

Reducing the interfacial resistance between solid electrolytes and electrodes is critical for developing high-energy density solid-state batteries. In the present study, a simple strategy of designing an integrated cathode and solid electrolyte (ICSE) to avoid a contact interface is proposed and successfully fulfilled with the help of UV curving. Firstly, a porous polymer film (PVDF-HFP/PVDF) was formed on the surface of the porous LiFePO₄ electrode via PVP dissolution. Secondly, curable monomers, including PEGDA/PETMP/TFEMA, were filled into the porous membrane via infiltration and concentration. Lastly, the ICSE was obtained via curing with ultraviolet light. The as-prepared LiFePO₄//ICSE//Li solid battery displays excellent electrochemical performance with a high reversible capacity of 153 mA h g^-1 and a capacity of over 140 mA h g^-1 was retained after 150 cycles at 0.1C and 25 °C. This ICSE strategy may effectively contribute to the practical application of all-solid-state batteries.