A Bidirectional Ion Kinetic Regulator Suppressing Lithium Dendrites in Advanced Lithium‐Sulfur Batteries
Abstract
Abstract Liquid organic electrolytes (LOEs) are of crucial significance in secondary battery deposition processes. Based on Sand's time formula, this study proposes a novel bidirectional ion kinetic regulator concept. Verified in lithium‐sulfur batteries (LSBs), it is demonstrated that regulating the migration of anions and cations simultaneously can effectively promote the realization of dendrite‐free batteries. This bidirectional ion kinetic regulator forms octahedral complexes with TFSI − , decreasing TFSI − migration, enhancing Li + desolvation and diffusion, and thus extending the dendrite formation time by over 25 times. Moreover, the attraction of the regulator towards solvent molecules and its improvement on the sulfur reduction kinetics effectively suppress the shuttle effect. Subsequently, the assembled Li||Li (1 mA cm −2 for 2000 h), Li‐Cu (99.4% of CE), and Li‐S (1000 cycles at 4 C) cells deliver extremely excellent cycling stability. An Ah‐level Li‐S pouch cell also exhibits negligible capacity decay (50 cycles without capacity decay). This confirms the importance of regulating both anions and cations for high‐safety LSBs.
Article Details
Authors (12)
Jun Jiang
State Key Laboratory of Precision and Intelligent Chemistry, Hefei National Research Center for Physical Sciences at the Microscale, School of Chemistry and Materials Science
Yanwen Ding
Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology Nanjing 210094 China
Shujun Liu
Research Center for Carbon-Neutral Environmental & Energy Technology, Institute of Fundamental and Frontier Sciences
Zhijie Qi
Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology Nanjing 210094 China
Tong Guo
Zhihua Wang
School of Materials Science and Engineering, Tianjin Key Laboratory of Metal and Molecular Materials Chemistry, Frontiers Science Center for New Organic Matter, Nankai University, Tongyan Road 38, Tianjin 300350, P. R. China
Jingwen Sun
Department of Chemistry and Biochemistry
He Zhu
Xiaoping Ouyang
Xin Wang
Junwu Zhu
Key Laboratory for Soft Chemistry and Functional Materials of Ministry Education, School of Chemistry and Chemical Engineering
Yongsheng Fu
Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology Nanjing 210094 China