Interpenetrating network‐reinforced gel polymer electrolyte for ultra‐stable lithium−iodine batteries

Author:

Jiang Ying1,Huang Peng1,Tong Minman1,Qi Bingxin1,Sun Tao1,Xian Zhongyun1,Yan Wen1ORCID,Lai Chao1ORCID

Affiliation:

1. School of Chemistry and Materials Science Jiangsu Normal University Xuzhou Jiangsu China

Abstract

AbstractLi−I2 batteries have attracted much interest due to their high capacity, exceptional rate performance, and low cost. Even so, the problems of unstable Li anode/electrolyte interface and severe polyiodide shuttle in Li−I2 batteries need to be tackled. Herein, the interfacial reactions on the Li anode and I2 cathode have been effectively optimized by employing a well‐designed gel polymer electrolyte strengthened by cross‐linked Ti–O/Si–O (GPETS). The interpenetrating network‐reinforced GPETS with high ionic conductivity (1.88 × 10−3 S cm−1 at 25°C) and high mechanical strength endows uniform Li deposition/stripping over 1800 h (at 1.0 mA cm−2, with a plating capacity of 3.0 mAh cm−2). Moreover, the GPETS abundant in surface hydroxyls is capable of capturing soluble polyiodides at the interface and accelerating their conversion kinetics, thus synergistically mitigating the shuttle effect. Benefiting from these properties, the use of GPETS results in a high capacity of 207 mAh g−1 (1 C) and an ultra‐low fading rate of 0.013% per cycle over 2000 cycles (5 C). The current study provides new insights into advanced electrolytes for Li−I2 batteries.

Funder

Natural Science Foundation of Jiangsu Province

National Natural Science Foundation of China

Publisher

Wiley

Subject

Materials Chemistry,Energy (miscellaneous),Materials Science (miscellaneous),Renewable Energy, Sustainability and the Environment

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