Zeolitic imidazolate framework upgrading polyethylene oxide composite electrolyte for high-energy solid-state lithium batteries

Lai Wei; Xin Xu; Sen Jiang; Kang Xi; Linghao Zhang; Yuelang Lan; Junying Yin; Haihua Wu; Yunfang Gao

doi:10.1016/j.jcis.2022.09.142

Zeolitic imidazolate framework upgrading polyethylene oxide composite electrolyte for high-energy solid-state lithium batteries

J Colloid Interface Sci. 2023 Jan 15;630(Pt A):232-241. doi: 10.1016/j.jcis.2022.09.142. Epub 2022 Oct 2.

Authors

Lai Wei¹, Xin Xu¹, Sen Jiang¹, Kang Xi¹, Linghao Zhang¹, Yuelang Lan¹, Junying Yin², Haihua Wu³, Yunfang Gao⁴

Affiliations

¹ State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
² State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China; Engineering Research Center for Industrial Wastewater Treatment and Reuse of Shandong Province, Binzhou Key Laboratory of Applied Electrochemistry, College of Chemical Engineering and Safety, Binzhou University, Binzhou 256603, China.
³ State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China. Electronic address: haihuawu@zjut.edu.cn.
⁴ State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China. Electronic address: gaoyf@zjut.edu.cn.

PMID: 36242883
DOI: 10.1016/j.jcis.2022.09.142

Abstract

The energy density of solid-state lithium batteries (SSLBs) has been primarily limited by the low ionic conductivity of solid electrolyte and poor interface compatibility between electrolyte and electrodes. Herein, a multifunctional composite solid polymer electrolyte (CSPE) based on polyethylene oxide (PEO) embedded with zeolitic imidazolate framework-8 deposited on carboxymethyl cellulose (ZIF@CMC) is reported. The ZIF@CMC interpenetrated in PEO matrix creates a continuous Li⁺ conductive network by combining Zn²⁺ in ZIF with the unsaturated group in PEO to boost the Li⁺ transport through the PEO chain segment. On the other hand, Zn²⁺ can bond with bis(trifluoromethane)sulfonimide (TFSI^-) anion, thus promoting the dissolution of lithium salt and releasing more lithium ions. This CSPE demonstrates brilliant electrochemical properties, including a high ionic conductivity of 1.8 × 10^-4 S cm^-1 at room temperature and a wide electrochemical window of 5 V. The integrated LiFePO₄/CSPE/Li batteries using 20 wt.% ZIF-8@CMC show excellent reversible capacity of 145.6 mAh g^-1 with a capacity retention of 88.95 % after 200 cycles at a high current density of 0.5C. Our study proposed a novel and effective strategy to construct high-performance solid-state lithium batteries.

Keywords: Composite solid polymer electrolyte; Metal-organic framework; Polyethylene oxide; Solid-state lithium batteries.