Hybrid covalent organic-framework-based electrolytes for optimizing interface resistance in solid-state lithium-ion batteries

Year: 2022

Type: article

Abstract: High ion conductivity and low electrode-electrolyte interface resistance are intensively pursued topics for the development of solid-state Li-ion batteries with high safety and energy density. Here, we propose a design using keto-enamine covalent organic frameworks (TPBD) and polyethylene oxide (PEO) to prepare a solid-state electrolyte (TPBD-LiPF6@PEO), achieving a high ion conductivity of 0.543 mS cm−1 at 25°C and optimizing the electrode-electrolyte interface resistance in Li-ion batteries. Solid-state nuclear magnetic resonance experiments and density functional theory calculations show that the strong interaction between the –C=O site in TPBD and Li+ ions promotes the dissociation of LiPF6. The assembled LiFePO4|TPBD-LiPF6@PEO|Li batteries without using liquid electrolytes offer a specific capacity of nearly 140 mAh g−1 at 0.2 C with a columbic efficiency of 99.6% after 200 cycles at 25°C. This strategy for preparing solid-state electrolytes provides practical ideas and suggestions in the development of solid-state energy devices.

Source: Cell Reports Physical Science

DOI: 10.1016/j.xcrp.2021.100731

Authors: Dongming Cheng, Cui Sun, Zhongling Lang, Jinhua Zhang, Ajuan Hu, Jianing Duan, Xinyu Chen, Hong-Ying Zang, Jiajia Chen, Mingsen Zheng, Quanfeng Dong

Institutions: Northeast Normal University, Xiamen University, Collaborative Innovation Center of Chemistry for Energy Materials

Language: English

Topic: Advanced Battery Materials and Technologies

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: gold

Estimated APC paid: $5,200

Funders: Natural Science Foundation of Jilin Province, Innovative Research Group Project of the National Natural Science Foundation of China, National Natural Science Foundation of China, Chinese Academy of Sciences, People's Government of Jilin Province, Xiamen University, Education Department of Jilin Province, State Key Laboratory of Polymer Physics and Chemistry, Foundation for Innovative Research Groups of the National Natural Science Foundation of China, Changchun Institute of Applied Chemistry, Fundamental Research Funds for the Central Universities

OpenAlex ID: W4206489408