碳材披覆於矽／石墨／氮化鋁複合物之鋰離子電池負極材料性能研究

Carbon-Coated Si/Graphite/AlN Composites as Anode Materials for Lithium Ion Batteries

10.29507/JT.201006.0005

吳玉祥(Yu-Shiang Wu)；陳伯坤(Po-Kun Chen)

鋰離子電池 ； 負極材料 ； 矽 ； 天然石墨 ； 氮化鋁 ； Li-ion battery ； anode ； silicon ； natural graphite ； aluminum nitride AlN

技術學刊

25卷2期（2010 / 06 / 01）

131 - 139

繁體中文

本研究主要是將矽、石墨和氮化鋁三種材料，依不同的混合比例與處理形成複合材料，作爲鋰離子電池負極材料。當矽／石墨／氮化鋁複合材料分別以不同的重量比例，再披覆40 wt.%的咈喃樹脂，經8小時研磨後，由充放電測試結果發現，利用緩衝效應將氮化鋁視爲一種非活性的緩衝材，與矽混合後能抑制矽於充放電時的體積膨脹問題，有效改善電容量的循環穩定性，並降低第一次不可逆性至10%，且經過5次充放電循環測試後電容量可維持在700 mAh/g左右，其電化學性能顯示有較佳的電容量和穩定的循環壽命。因爲氮化鋁的加入與研磨處理，有助於矽的第一次不可逆電容量降低；另將矽複合材料披覆咈喃樹脂處理後，其電容量的衰退較爲穩定，且循環穩定性也有所提升。

Silicon/graphite/aluminum nitride (AlN) composites with different weight ratios were mixed as precursors for anode materials of Li-ion batteries. The silicon/graphite/AlN composites with different proportions of weight separately and coating containing 40 wt.% furan resin after milling for 8 hours, are measured with charge and discharge tests. The inactive AlN working as a buffer matrix successfully prevents silicon large volume change during charge and discharge electrochemical test. The composites show excellent cycling performance with a reasonable value of the first irreversible capacity to 10%. The capacity is retained about 700 mAh/g after 5 cycles. The first irreversibility will obviously be reduced. The capacity decade of carbon-coated silicon composites with furan resin will be comparatively steady and the circulation stability will be also improved.