山崖一角
幼苗
共回答了19个问题采纳率:84.2% 举报
Silicon is the most likely alternative graphite anode materials of lithium ion batteries,because silicon has a large capacity (Li4.4Si alloy was 4200mAh / g ),lithium intercalation potential is low ( below 0.5V) and an electrolyte and has the advantages of low reaction activity.But the silicon particles in the insertion / extraction process generates intense volume change,making silicon particle powder electrode failure,rapid attenuation.Through the pyrolysis tar or polyvinyl chloride ( PVC ) preparing a silicon / carbon composite can significantly improve the cycle performance of material,the carbon to volume changes can effectively buffer,thereby inhibiting capacity attenuation,and the carbon has small volume expansion,good conductivity,light weight and so on are closely related.
1年前
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