Preparation and Performance Improvement of Porous Silicon Carbon Composite Materials
Lithium-ion batteries are mainly developing in the direction of high energy density. At room temperature, silicon-based negative electrode materials alloy with lithium to produce lithium-rich product Li3.75Si phase, with a specific capacity of up to 3572 mAh/g, which is much higher than the theoretical specific capacity of graphite negative electrode 372 mAh/g. However, during the repeated charging and discharging process of silicon-based negative electrode materials, the phase transformation of Si and Li3.75Si can produce huge volume expansion (about 300%), which will lead to structural powdering of electrode materials and continuous formation of SEI film, and finally cause the capacity to drop rapidly. The industry mainly improves the performance of silicon-based […]
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