硅/活性炭复合材料的制备及其电化学性能  

Preparation and lithium storage properties of lithium titanate with a hierarchical structure

作　　者：王瑨 王建全 阮殿波 谢皎 杨斌 WANG Jin;WANG Jianquan;RUAN Dianbo;XIE Jiao;YANG Bin(Sichuan Best Graphite New Energy Co.Ltd.;Sichuan Jingke Eterprise Management Service Co.Ltd.,Suining 629000,Sichuan,China;Faculty of Mechanical Engineering&Mechanics,Ningbo University,Ningbo 315000,Zhejiang,China)

机构地区：[1]四川佰思格新能源有限公司 [2]四川经科企业管理服务有限公司,四川遂宁629000 [3]宁波大学机械工程与力学学院,浙江宁波315000

出　　处：《储能科学与技术》2021年第1期104-110,共7页Energy Storage Science and Technology

摘　　要：以纳米硅作为硅源,苯胺作为碳源,通过原位聚合结合炭化合成硅/炭复合材料,接着通过水蒸气物理活化得到硅/活性炭复合物。使用XRD、N2吸附法、透射电镜以及半电池充放电测试等方法对硅/活性炭复合材料的结构和锂电池性能进行分析。实验数据表明:水蒸气活化温度与活化时间分别为750°C和20 min时,得到的硅/活性炭复合材料表现出比硅/炭复合材料更好的倍率和循环性能,该样品在100、200、300和500 mA/g电流密度下的克容量分别为2860、2482、2212和1933 mA·h/g,当电流密度达到1000 mA/g时,克容量仍有1505 mA·h/g,而当电流密度降低为100 mA/g时,材料的克容量恢复到2554 mA·h/g,保持率为89.3%,反映了良好的倍率性能。Silicon/carbon(Si/C)composites were prepared from nano silicon and aniline by in-situ polymerization and carbonization.After further H2O steam activation,the Si/AC composites were obtained.The microstructure and electrochemical performances of the as-prepared Si/AC composites were characterized by X-ray diffraction,N2 isotherm adsorption,transmission electron microscopy,and galvanostatic chargedischarge measurement.The results show that when the activation temperature was 750°C and the activation time was 20 min,the obtained Si/AC composites showed a better high-rate and cycling performance than the Si/C composites.The specific capacities of the Si/AC 20 composites are 2860,2482,2212,and 1933 mA·h/g at the current densities of 100,200,300 and 500 mA/g.Moreover,the specific capacity is still as high as 1505 mA·h/g at the current density of 1000 mA/g.When the current density returns to 100 mA/g,the discharge specific capacity recovers to 2554 mA·h/g,with a capacity retention ratio of 89.3%.

关 键 词：硅/活性炭复合物 电化学性能 锂离子电池 

分 类 号：O646[理学—物理化学]