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Photo-Cross-Linkable Polymeric Binder for Si Anodes in Lithium Ion Batteries

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Title
Photo-Cross-Linkable Polymeric Binder for Si Anodes in Lithium Ion Batteries
Author
Lee, Sueun
Advisor
Kim, Byeong-Su
Keywords
Binder; Poly acrylic acid; Photo crosslinking; Lithium ion batteries; Silicon anode; Benzophenone
Issue Date
2013-02
Publisher
Graduate School of UNIST
Abstract
Silicon has received much interest as an attractive anode material for lithium ion batteries due to its superior theoretical specific capacity of ca. 4200 mAh g-1, which is an order of magnitude higher than those of the conventional graphite anodes. However, Si-based anodes suffer from severe volume expansion during the lithiation and delithiation, which cause high stress and pulverization, resulting in degradation of cycle life. Recent studies have demonstrated that the development of polymeric binders plays an important role in controlling the electrochemical performance of batteries by inhibiting mechanical fracture of Si anodes during cycling. According to the previous reports, poly (acrylic acid) (PAA) binders effectively accommodate volume expansion of Si particle due to reversible cross-linking nature between carboxylic groups. However, this reversible cross-linking is often susceptible to the environmental changes. Herein, we report for the first time that PAA functionalized with photo-cross-linkable benzophenone moiety (PAA-BP) with an aim to enhance the cycle life of batteries. PAA-BP binders form irreversible cross-linked structure by covalent bond upon UV-irradiation, leading to the enhanced mechanical and chemical stability that endure the environmental changes. We demonstrate PAA-BP binders effectively bind Si particles together and suppress the large volume change with superior cycle stability and high capacity.
Description
Energy Conversion & Storage
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