Electrochemical characteristics of surfaced modified silicon powder as the anode material for lithium ion batteries

Electrochemical characteristics of surfaced modified silicon powder as the anode material for lithium ion batteries
Issue Date
International Conference on Advanced Electromaterials 2011
Silicon has been widely proposed as a anode material of lithium ion batteries, due to its high natural abundance, low discharge potential, and high theoretical charge capacity (4200mAhg−1). However, the large volume changes (400%) and loss via reduced electronic contact during lithium-ion insertion and extraction result in capacity fading. Several approaches can be considered to enhance the capacity retention, such as reducing the silicon particle size to the nanoscale or making the silicon-based composites or modifying the silicon surface.[1-3] The surface modification of silicon helps accommodate the large volume variations that occur during the lithium-ion insertion/extraction processes. In this study, the surface modified silicon powders were prepared by metal-assisted etching process as the anode material of lithium ion batteries. The surface etched silicon powders were synthesized by electroless silver deposition on surface of silicon particles in etching solution at room temperature. The silicon powders with an average particle size of 5μm, which were used as the raw material by Kojundo co., and the etching solutions were mixtures of AgNO3 (0.036molL−1) and aqueous HF solution (2.5molL−1). The morphologies of the surface etched silicon were characterized by scanning electron microscope (SEM) and the surface areas were measured by the Brunauer emmett Teller (BET) method. The assembly of coin-type (CR-2032) half cells was fabricated in a dry room kept with a moisture content of less of than 0.5%. The conducting material was denka black (DB) and the binder was polyimide (PI) and the separator was a polypropylene (PP) micro-porous membrane and the liquid electrolyte was 1M LiPF6 dissolved in a mixture of ethylene carbonate (EC), ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC) (1:1:1 in vol %).
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