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    New, Effective, and Low-Cost Dual-Functional Binder for Porous Silicon Anodes in Lithium-Ion Batteries

    Editor:yingwen Date:2019-04-03 Hits:104

    Rongnan Guo, Shunlong Zhang, Hangjun Ying, Wentao Yang, Jianli Wang, and Wei-Qiang Han [ACS Applied Materials & Interfaces]

    ABSTRACT: In this work, a new effective and low-cost binder applied in porous silicon anode is designed through blending of low-cost poly(acrylic acid) (PAA) and poly-(ethylene-co-vinyl acetate) (EVA) latex (PAA/EVA) to avoid pulverization of electrodes and loss of electronic contact because of huge volume changes during repeated charge/discharge cycles. PAA with a large number of carboxyl groups offers strong binding strength among porous silicon particles.EVA with high elastic property enhances the ductility of the PAA/EVA binder. The high-ductility PAA/EVA binder tolerates the huge silicon volume variations and keeps the electrode integrity during the charge/discharge cycle process. EVA colloids acting as host aterials for electrolytes increase the electrolyte uptake of electrodes. The porous silicon electrode with the PAA/EVA binder exhibits a reversible capacity of 2120 mA h g−1 at 500 mA g−1 after 140 cycles because of the excellent ductility and lithium-ion transport properties of the PAA/EVA binder.

    DOI: 10.1021/acsami.8b21936

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