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Published on: May 22, 2018
A Modified Natural Polysaccharide as a High-Performance Binder for Silicon Anodes in Lithium-Ion Batteries
Shanming Hu1, Zhixiang Cai2, Tao Huang1
1Laboratory of Advanced Materials, Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, Collaborative Innovation Center of Chemistry for Energy Materials , Fudan University , Shanghai 200438 , China.
Abstract:
A modified natural polysaccharide (carboxymethylated gellan gum) is investigated as a water-soluble high-performance binder for silicon anodes in lithium-ion batteries to improve poor cycle life and fast capacity fade of silicon anodes due to dramatic volume expansion during lithiation/delithiation process. The numberof carboxyl and acetyl groups distributed homogeneously in the modified polysaccharide polymer chain can form strong hydrogen bonds with the surface of Si particle and copper current collector, thus effectively restricting the volume change of silicon and maintaining electronic integrity of Si electrodes during repeated charge/discharge cycles. As a result, Si anodes with carboxymethylated natural polysaccharide polymer present high capacity performance, excellent rate capability, and stable cycling.
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