球磨时间对LiFePO_4/C性能的影响  

Effect of different ball-milling time on the preparation of LiFePO_4/C

作　　者：李春霞 李普良 李华成 唐跃波 

机构地区：[1]中信大锰矿业有限责任公司,南宁530028

出　　处：《化工新型材料》2013年第12期105-106,110,共3页New Chemical Materials

基　　金：广西科学研究与技术开发计划资助项目(桂科攻11107019-2)

摘　　要：以碳酸锂、磷酸铁、单水葡萄糖为主要原料,选用高效的立式搅拌磨做球磨设备,采用湿法球磨混料和高温固相反应法合成锂离子电池正极材料LiFePO4/C。研究了不同球磨时间对LiFePO4/C的物理性能和电化学性能的影响。通过粒度分布、振实密度、比表面积、扫描电子显微镜、充放电测试对材料性能进行表征。结果表明,控制球磨时间为3h,在热处理温度为700℃的条件下,合成的LiFePO4/C正极材料具有较好的性能,振实密度为1.41g/cm3,比表面积为13.9m2/g,以0.2C倍率充放电时的首次充放电效率为95.2%、首次放电容量为151.4mAh·g-1,1C充放循环100次的容量保持率为99.3%。LiFePO4/C was synthesized by high temperature solid phase method with wet ball-milling procedure, used LiFePO4, FePO4 · 2H2 O, C6 Hi2 O6 · H2O as raw materials. Vertical stirring ball mill using as ball milling equipment had the advantage of high efficiency. Effect of different ball-milling time on physical and electrochemical performance of samples was discussed. Samples were characterized by average particle size（D500 ）, tap density（T. D. ）, surface area（BET）, scanning electron microscopy（ SEM） and charge-discharge test. Results indicated that samples synthesized at 700℃, con trolled by wet ball-milling time for 3h presented best performance. The tap density（T. D. ）was 1.41g/cm3 ,and the surface area（BET）was 13.9 m2/g. The first discharge capacity was 151.4 mAh/g and the first charge-discharge efficiency was 95. 2% at 0. 2C. At 1C rate,99.3% of initial capacity were retained after 100 cycles.

关 键 词：锂离子电池 正极材料 LIFEPO4 C 球磨 

分 类 号：TM912[电气工程—电力电子与电力传动]