Li_3V_2(PO_4)_3溶胶-凝胶-微波合成工艺优化及性能研究  

Optimization and Performance Study of Li_3V_2(PO_4)_3 Synthesized by Sol-gel-microwave Method

作　　者：张勇[1] 吕艳[1] 王力臻[1] 张爱勤[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

出　　处：《热加工工艺》2011年第4期14-16,19,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(21001097);河南省科技厅基础与前沿技术研究项目(102300410107);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(金科字[2009]35号(35))

摘　　要：用溶胶-凝胶-微波法制备了锂离子电池正极材料Li3V2(PO4)3样品,用正交试验法考察了影响样品性能的因素,分析并优化了工艺。XRD、SEM和电化学测试表明:该方法所制备的样品为单斜结构,粒径尺寸0.2～1μm,颗粒分布比较均匀。锂源为Li2CO3、反应物摩尔比为Li∶V=3.0∶2.0、微波时间为25 min时,为最佳合成工艺条件。在此优化条件下,3.0～4.3 V区间内0.2 C放电比容量达到106 mAh/g,交换电流密度高达6.17×10-6 A/cm2。Li3V2（PO4）3 cathode materials for lithium ion batteries were synthesized by sol-gel-microwave method.The influencing factors on the properties of the samples were discussed and the technology parameters were optimized using orthogonal experiment method.XRD,SEM and electrochemical test show that the material has a single monoclinic structure and grain size is from 0.2 μm to 1 μm and in uniform distribution.The optimal condition is that lithium source is Li2CO3,the ratio of reactant Li ∶ V is 3.0 ∶ 2.0 and microwave time is 25 min.Under the conditions,the product has excellent electrochemical performance,the initial specific discharge capacity is 106 mAh/g,when 0.2C charge-discharge is 3.0～4.3 V.The exchange current density is determined as 6.17 × 10-6 A/cm2 by Tafel curve.

关 键 词：LI3V2(PO4)3 锂离子电池 正交试验 溶胶-凝胶-微波法 

分 类 号：TM912.9[电气工程—电力电子与电力传动] TG146.263[一般工业技术—材料科学与工程]