锂离子电池负极材料钛酸锂的掺镁改性  

Modifying lithium titanium oxide as Li-ion battery anode material by doping Mg

作　　者：肖志平[1] 肖方明[1] 王英[1] 唐仁衡[1] 

机构地区：[1]广东省工业技术研究院(广州有色金属研究院)稀有金属研究所,广州510650

出　　处：《电池》2013年第4期195-198,共4页Battery Bimonthly

基　　金：广东省战略性新兴产业发展专项资金

摘　　要：以醋酸镁为掺杂源，采用二步固相法合成负极材料尖晶石型Li-MgTi50。2（x=0,0．12、0．20、0．30和0．50），通过XRD、SEM及电化学等测试对材料的性能进行分析。当Li（A）位的Mg掺入量x≤0．20时，可获得具有单一尖晶石相的产物，Mg掺杂降低了合成材料的颗粒度及电极／溶液界面电荷转移阻抗，改性后的平均粒径为0．6μm。x=0．20的材料在1．0～3．0V充放电，10．0C首次放电比容量为93．8mAh／g，以5．0C循环200次，容量保持率为90．5％。Spinel-type anode materials Li4 xMgxTi5 O12 （ x = 0,0. 12,0.20,0. 30 and 0. 50） were synthesized using magnesium ace- tate as dopant source by two-step solid state method. The performance of the material was analyzed by XRD, SEM and electrochemical tests. A pure spinel phase was obtained as doping amount of magnesium x〈0. 20,an average particle size of 0. 6 p,m was ob tained and charge transfer resistance at electrode/electrolyte interface was reduced for the materials after modified. When the material（x = 0. 20） was charged-discharged at 1.0 - 3.0 V,its initial 10. 0 C discharge specific capacity was 93.8 mAh/g and 90. 5% of capacity retention rate was exhibited at 5.0 C after 200 cycles.

关 键 词：锂离子电池 负极材料 钛酸锂(LiTi5O12) 掺杂 

分 类 号：TM912.9[电气工程—电力电子与电力传动]