Journal
SCIENCE CHINA-MATERIALS
Volume 64, Issue 1, Pages 105-114Publisher
SCIENCE PRESS
DOI: 10.1007/s40843-020-1389-x
Keywords
sodium-ion batteries; solid electrolyte interphase; polymer binder; metal sulfides; initial coulombic efficiency
Categories
Funding
- National Natural Science Foundation of China [U1804129, 21771164, 21671205, U1804126]
- Zhongyuan Youth Talent Support Program of Henan Province
- Zhengzhou University Youth Innovation Program
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In this study, a polar polymer binder sodium polyacrylate (PAANa) was used to improve the performance of metal chalcogenides (FeS) without modifying the active materials, demonstrating a special network structure that enhances the interface between active material particles and electrolytes. This new approach not only improves cyclic stability and rate performance, but also provides a new understanding of the binder on electrodes for potential battery applications.
High-capacity metal chalcogenides often suffer from low initial coulombic efficiency (ICE) and serious capacity fading owing to the shuttle effect and volumetric expansion. Various carbon-coating and fixing methods were used to improve the above-mentioned performance. However, the synthesis processes of them are complex and time-consuming, limiting their engineering applications. Herein, polar polymer binder sodium polyacrylate (PAANa) is selected as an example to solve the problems of metal chalcogenides (bare micro-sized FeS) without any modification of the active materials. The special function of the polymer binder in the interface between the active material particles and the electrolytes demonstrates that a PAANa-induced network structure on the surface of ion sulfide microparticles not only buffers the mechanical stress of particles during discharging-charging, but also participates in forming a ductile solid electrolyte interphase (SEI) with high interfacial ion transportation and enhanced ICE. The cyclic stability and rate performance can be simultaneously improved. This work not only provides a new understanding of the binder on electrode, but also introduces a new way to improve the performance of batteries.
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