School of Chemistry and Chemical Engineering，Shanghai Jiao Tong University
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DOI:
10.7502/j.issn.1674-3962.2016.07.06
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Abstract:
Silicon has attracted enormous attentions because of its theoretical capacity ten times higher than that of graphite and its proper discharge potential, which makes silicon one of the most promising anode materials for lithium-ion batteries. However, silicon has poor electronic conductivity and enormous volume change（＞300%）during lithiation process, which lead to the pulverization of materials, crash of electrode and electrical contact loss.Moreover, continuous formation of SEI layer on the silicon surface in the electrolytecauses the problems like polarization increase, low coulombic efficiency and electrolyte consumption.Approachesto overcome these hinders and realize the commercial application of silicon based electrodes mainly include preparing advanced silicon-based materials to suppress the volume effect and rise the conductivity, improving the binder to strengthen the electrode structure and prevent its collapse, and ameliorating electrolyte to enhancethe quality of SEI film andcoulombic efficiency. Currently, the main strategies of improving the performance of Si materials are the structure designs towards nanoscale, porosity and composite.The improvement of binder can be divided into two aspects: developing new binders and ameliorating existing binders. This paper summarizes the recent process from two aspects of silicon-based materials and binder, and discusses the development trends.