a-V_2O_5/BC复合正极材料的制备及其性能研究  

Study on synthesis and performance of a-V_2O_5/BC composite cathode material

作　　者：张勇[1] 王鸿旻[2] 王力臻[1] 张爱勤[1] 冯辉[1] 李晓峰[1] 宋延华[1] 

机构地区：[1]郑州轻工业学院河南省表界面科学重点实验室,河南郑州450002 [2]中国烟草总公司职工进修学院

出　　处：《无机盐工业》2010年第8期13-16,共4页Inorganic Chemicals Industry

基　　金：河南省高等学校青年骨干教师资助计划项目(豫教高(2009)844号);郑州市科技攻关项目(0910SGYG23259);郑州市金水区科技攻关项目(200935)

摘　　要：以天然毛竹为原料,采用固相反应法在惰性气体气氛下合成了竹炭（BC）和无定型五氧化二钒（a-V2O5/BC）复合正极材料。采用XRD,SEM和电化学测试等手段表征样品结构、形貌以及电化学性能。结果表明,所制备的BC样品为多孔无定型结构,粒径在0.2-90μm。掺杂BC在很大程度上可以改善a-V2O5的电化学性能,尤其是大电流放电性能。当a-V2O5与BC的质量比为1∶4时,a-V2O5/BC的电性能最佳,10 mA/g充放电的首次放电比容量为116.4 mA.h/g,200 mA/g放电的比容量为54.3 mA.h/g,为首次放电比容量的46.6%,而纯a-V2O5电极的比容量仅为其首次放电比容量时的0.7%。Using natural moso bamboo as raw material,bamboo charcoal（BC） and amorphous vanadic oxide（a-V2O5） composite cathode material（i.e.a-V2O5/BC） was synthesized by solid state method in inert atmosphere.Structure,morphology,and electrochemical properties of a-V2O5/BC were characterized by X-ray diffraction（XRD）,scanning electron microscope（SEM）,and electrochemical measurement methods etc..Results showed that the BC samples had an amorphous structure with grain size of 0.2~90 μm.Doping BC can improve electrochemical properties of a-V2O5 to a large extent,especially the high-current discharge performance.When mass ratio of a-V2O5 to BC was 1∶4,a-V2O5/BC had the best electrochemical properties.First discharge specific capacity was 116.4 mA·h/g at 10 mA/g,and discharge specific capacity kept at 54.3 mA·h/g at 200 mA/g,which was 46.6% of the first discharge specific capacity.But the discharge specific capacity of pure a-V2O5 was only 0.7% of the first discharge specific capacity.

关 键 词：无定型五氧化二钒 锂离子电池 竹炭 

分 类 号：TQ135.11[化学工程—无机化工]