采用湿法混料及高温热解法制备了锂离子电池用硅/石墨/碳复合负极材料,并研究了不同配方的复合材料结构及电化学性能。研究发现,硅含量为20%（质量分数）时,复合材料首次可逆容量为865mAh/g,循环30次后仍为757mAh/g,容量保持率可达88%,大大改善了硅基材料作为锂离子电池负极材料的电化学性能。
The Si/graphite/carbon composites were prepared through wet milling technique followed by pyrolysis method in this work. The phase structures, electrochemical performances and kinetics of the as-prepared composites were analyzed respectively. The effect of different components ratio on cycling performance was investigated specially. The results showed that the composites consisted of 20wt% Si and 30wt% graphite exhibited the best overall performances, in which the first reversible capacity was up to 865mAh/g with Coulomb efficiencvof69%, and the capacity retention after 30 cycles was 88%.
参考文献
| [1] | Huggins RA. .Alternative materials for negative electrodes in lithium systems[J].Solid state ionics,2002(Pt.A):61-68. |
| [2] | Wang GX;Ahn JH;Yao J;Bewlay S;Liu HK .Nanostructured Si-C composite anodes for lithium-ion batteries[J].Electrochemistry communications,2004(7):689-692. |
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