摘要
采用高温热解法制得Si/C/B2O3复合材料,并用XRD和XPS分析材料的物相结构和组成。以复合材料为锂离子电池电极进行恒流充放电测试,并通过循环伏安曲线和充放电曲线研究了材料的电化学反应特性。结果表明,复合材料中的硼以氧化物的形式存在,材料的可逆容量和电化学循环稳定性较硅/碳材料均有较为明显的提高,900℃条件下热解得到的材料的首次可逆容量为584mA·h·g-1,复合材料在第40次循环的可逆容量可达到mA·h·g-1。
The Si/C/B2O3 composites were prepared by pyrolyzing the phenol-formaldehyde resin （PFR） mixed with silicon and boric acid powders. The phase structure and composition of the prepared Si/C/B2O3 composites were analyzed by X-ray diffraction （XRD） and X-ray Photoelectron Spectroscopy （XPS）. Using the prepared Si/C/B2O3 composites as negative electrodes in Li-ion batteries, their charge-discharge performance were tested, and the electrochemical reactions of the composites were also studied by cyclic voltammograms （CV） and charge-discharge curves. The results show that the element boron in the composite is in the form of boron oxide, and the initial reversible capacity and cycle performance of the Si/C/B2O3 composites prepared are improved significantly by the addition of the compound containing element boron into the silicon/carbon materials. The charge-discharge test results show that the Si/C/B2O3 composite prepared by pyrolysis at 900℃ exhibits an initial capacity of 584 mA·h·g^-1 with a coulombic efficiency of 60%, and its reversible capacity remains 325 mA·h·g^-1 after 40 cycles.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2009年第4期705-708,共4页
Journal of Chemical Engineering of Chinese Universities
基金
国家自然科学基金(20673032)
黑龙江省科技攻关重点项目(GB06A309)
中国博士后基金(20070420860)项目
关键词
锂离子电池
负极材料
硅
碳
氧化硼复合材料
电化学性能
Li-ion battery
negative electrode material
Si/C/B2O3 composite
electrochemical performance
