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A bi-polymer-crosslinked binder to improve the kinetics of sodiation,desodiation and reversibility of antimony for sodium ion battery anodes.

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Title
A bi-polymer-crosslinked binder to improve the kinetics of sodiation,desodiation and reversibility of antimony for sodium ion battery anodes.
Other Titles
소듐 이차전지용 안티모니 음극의 키네틱과 용량유지율을 향상시키는 가교 결합 바인더
Author
Kim, Dohyoung
Advisor
Song, Hyun-Kon
Keywords
Na-ion battery, antimony, polysaccharide binder, cross-linked binder, cation migration
Issue Date
2019-08
Publisher
Graduate School of UNIST
Abstract
Antimony has been developed as a promising anode material of sodium ion batteries (SIBs) even if its volume is tremendously expanded during the alloying reaction with sodium. Repeated volume changes along sodiation/desodiation cycles encourage capacity fading by triggering pulverization accompanying electrolyte decomposition. Also, low cation transference number of sodium ion is another huddle of SIBs In this work, a binder for antimony in SIB cells was designed to have bifunctionality to improve (1) the mechanical toughness to suppress the serious volume change and (2) the transference number of sodium ion. A crosslinked composite of poly(acrylic acid) (PAA) and cyanoethyl pullulan (pullulan-CN) was presented as the binder. The polysaccharide backbone of pullulan-CN was responsible for the mechanical toughness while the cyanoethyl groups improved by pullulan-CN. The antimony-based SIB cells using the composite binder showed improved cycle life with enhanced kinetics.
Description
Department of Chemical Engineering
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