Constructing Wide‐Temperature Lithium–Sulfur Batteries by Using a Covalent Organic Nanosheet Wrapped Carbon Nanotube

Author:

Zhu Acheng1,Li Shaokai2,Yang Yuting1,Peng Bo1,Cheng Yuwen1,Kang Qi3ORCID,Zhuang Zechao4,Ma Lianbo1,Xu Jie1ORCID

Affiliation:

1. School of Materials Science and Engineering Anhui University of Technology Ma'anshan 243002 P. R. China

2. Luzhou Dongfang Agrochemical Co. Ltd. Hangzhou Branch Zhejiang 310000 P. R. China

3. Department of Polymer Science and Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China

4. Department of Chemical Engineering Columbia University New York NY 10027 USA

Abstract

AbstractLithium–sulfur (Li–S) batteries hold the superiority of eminent theoretical energy density (2600 Wh kg−1). However, the ponderous sulfur reduction reaction and the issue of polysulfide shuttling pose significant obstacles to achieving the practical wide‐temperature operation of Li–S batteries. Herein, a covalent organic nanosheet‐wrapped carbon nanotubes (denoted CON/CNT) composite is synthesized as an electrocatalyst for wide‐temperature Li–S batteries. The design incorporates the CON skeleton, which contains imide and triazine functional units capable of chemically adsorbing polysulfides, and the underlaid CNTs facilitate the conversion of captured polysulfides enabled by enhanced conductivity. The electrocatalytic behavior and chemical interplay between polysulfides and the CON/CNT interlayer are elucidated by in situ X‐ray diffraction detections and theoretical calculations. Resultantly, the CON/CNT‐modified cells demonstrate upgraded performances, including wide‐temperature operation ranging from 0 to 65 °C, high‐rate performance (625 mAh g−1 at 5.0 C), exceptional high‐rate cyclability (1000 cycles at 5.0 C), and stable operation under high sulfur loading (4.0 mg cm−2) and limited electrolyte (5 µL mgs−1). These findings might guide the development of advanced Li–S batteries.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

Biomaterials,Biotechnology,General Materials Science,General Chemistry

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