双碳源制备磷酸钒锂及其电化学性能  

Preparation and Electrochemical Performance of Lithium Vanadium Phosphate with Double Carbon Sources

作　　者：孙华斌[1] 张露露[1,2] 杨学林[1] 李明[1] 温兆银[2] Sun Huabin Zhang Lulu Yang Xuelin Li Ming Wen Zhaoyin(China Three Gorges University, Yichang 443002, China CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China)

机构地区：[1]三峡大学,湖北宜昌443002 [2]中国科学院能量转换材料重点实验室上海硅酸盐研究所,上海200050

出　　处：《稀有金属材料与工程》2016年第11期3023-3029,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(51302153;51272128);中国科学院能量转换材料重点实验室开放课题基金项目(CKEM131404);湖北省教育厅重点项目(D20131303);三峡大学人才科研启动基金项目(KJ2012B043)

摘　　要：以葡萄糖为主碳源,抗坏血酸(AA)为辅助碳源,采用固相法合成了倍率性能优良的碳包覆磷酸钒锂(LVP/C-AA)复合正极材料。通过X射线衍射(XRD)仪、扫描电镜(SEM)、透射电镜(TEM)、拉曼光谱(Raman)、恒电流充放电测试、循环伏安(CV)和交流阻抗(EIS)测试表征了材料的物相、形貌、结构和电化学性能。结果表明,添加少量的抗坏血酸为辅助碳源对Li_3V_2(PO_4)_3晶体结构没有明显的影响,但能明显提高Li_3V_2(PO_4)的高倍率性能。LVP/C-AA在5 C时的首次放电比容量可达162.4 mAh·g^(-1),100次循环后容量保持率高达80.4%。Carbon coated lithium vanadium phosphate（LVP/C-AA） with high-rate performance was synthesized by a solid-state reaction using glucose as a main carbon source and ascorbic acid（AA） as an accessory carbon source. The phases, morphologies, structures and electrochemical performance of samples were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, charging and discharging measurements, cyclic voltammogram（CV） testing and electrochemical impedance spectra（EIS）. The results show that trace ascorbic acid as the accessory carbon source almost has no effect on the crystal structure of Li3V2（PO4）3, but greatly enhances the high-rate performance. The LVP/C-AA electrode delivers an initial capacity as high as 162.4 mAh·g-1 at 5 C, and exhibits an excellent capacity retention ratio of 80.4% even after 100 cycles.

关 键 词：锂离子电池 正极材料 磷酸钒锂 抗坏血酸 

分 类 号：TB332[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]