锂离子电池正极材料LiMnPO_4/C的固相法制备及性能研究  

Study on Synthesis and Characterization of LiMnPO_4/C Cathode Materials for Lithium Ion Batteries by Solid State Method

作　　者：李志军[1] 王红英[1] 汤伟杰[1] 罗大伟[2] 

机构地区：[1]深圳职业技术学院工业中心,深圳518055 [2]深圳职业技术学院应用化学与生物技术学院,深圳518055

出　　处：《人工晶体学报》2015年第3期773-778,共6页Journal of Synthetic Crystals

基　　金：广东省高等学校优秀青年教师培养计划资助项目(YQ2013191);深圳市科技计划项目(JCYJ20130331145557683)

摘　　要：以碳酸锂、碳酸锰和磷酸二氢铵为原料,以蔗糖为碳源,采用固相法制备了Li Mn PO4/C复合正极材料。利用正交试验考察了焙烧温度、焙烧时间、球磨时间、锂锰摩尔比和蔗糖用量对材料首次放电比容量的影响,得到了最佳工艺条件。通过XRD、SEM、同步热分析仪和充放电测试仪等测试了材料的结构和电化学性能。所得材料在室温下电流密度为0.1 C、0.5 C和1 C时首次放电比容量分别为130.5 m Ah/g、125.8 m Ah/g和117.1 m Ah/g,经过50次循环性能测试后容量分别为113.2 m Ah/g、98.1 m Ah/g和85.4 m Ah/g;在电流密度为0.1 C且温度为60℃时,其首次放电比容量为156.4 m Ah/g,测试结果表明循环性能较好。Li Mn PO4/ C composite cathode materials were synthesized by solid phase method using Li2CO3,Mn CO3,NH4H2PO4 as starting materials and sucrose as carbon source. The effects of roasting temperature and time,ball-milling time,the molar ratio of x（ Li） ∶ x（ Mn） and the dosage of sucrose on the initial discharge specific capacity were studied through orthogonal tests,thus optimized technology were gained. The structure of material and its electrochemical performance were tested by XRD,SEM,thermal analyser and constant current charge-and-discharge instrument. Under the optimized technology,the initial discharge specific capacities are 130. 5 m Ah / g,125. 8 m Ah / g and 117. 1 m Ah / g at 0. 1 C,0.5 C and 1 C rate respectively,at room temperature. After 50 times of circulation,its discharge specific capacities change to 113. 2 m Ah / g,98. 1 m Ah / g and 85. 4 m Ah / g respectively. And its initial discharge specific capacity is 156. 4 m Ah / g at 60 ℃ at 0. 1 C,and has good cycle performance.

关 键 词：LiMnPO4/C 正交试验 锂离子电池 正极材料 

分 类 号：TM912.9[电气工程—电力电子与电力传动] TB321[一般工业技术—材料科学与工程]