Deep Eutectic Solvent Binder Facilitating Reaction Kinetics of Lithium Sulfur Batteries
Abstract
Abstract Existing binders fail to integrate all designed functionalities, including the polysulfide shuttle effect, sluggish kinetic transformation, electrode volume variation, slow Li⁺ transfer, and flammable characteristics. Herein, the microwave irradiation method is used to prepare deep eutectic solvent (DES) binder; with the rapid conduction and full utilization of energy, citric acid and betaine (CB) binder is formed in a flash. Intramolecular and intermolecular hydrogen bonds between C and B provide robust adhesion, self‐healing capability, and flame‐retardant properties. More importantly, Li⁺ flux is directly improved by hydrogen bond acceptor (B) of DES rather than introducing additional segments or chemical treatment; then the redox kinetics are significantly promoted and the polysulfide shuttle is further suppressed. The types and dynamics of the hydrogen bonds are observed via Raman and dynamic mechanical analysis, while effective LiPS adsorption capability is confirmed through theoretical calculations and in situ Raman measurements. Furthermore, rapid LiPS conversion is verified by nucleation/dissolution experiments of Li 2 S and distribution of relaxation times (DRTs) analysis, and nucleation transformation ratio ( NTR ) calculation shows the similar result. Benefiting from the superior merits of the DES binder, lithium–sulfur (Li─S) battery presents stable cycling at 5 C with 61.3% capacity retention after 300 cycles.
Article Details
Authors (11)
Chen Li
Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY, USA.
Zhaokun Wang
Drug Discovery and Design Center, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences
Zuohang Li
State Key Laboratory of Crystal Materials School of Materials Science and Engineering Tianjin University of Technology Tianjin 300384 China
Junshi Zhang
Su Wang
Yue Ma
Xixi Shi
State Key Laboratory of Crystal Materials School of Materials Science and Engineering Tianjin University of Technology Tianjin 300384 China
Hongzhou Zhang
Dawei Song
State Key Laboratory of Crystal Materials School of Materials Science and Engineering Tianjin University of Technology Tianjin 300384 China
Jinshi Zhao
State Key Laboratory of Crystal Materials School of Materials Science and Engineering Tianjin University of Technology Tianjin 300384 China
Lianqi Zhang
State Key Laboratory of Crystal Materials, Institute for New Energy Materials and Low Carbon Technologies, School of Materials Science & Engineering