掺杂元素Co、Cr、La对尖晶石型锰酸锂电化学性能的影响  

Effect of doped-cation on electrochemistry speciality of lithium manganese spinel

作　　者：卢星河 唐致远[2] 张娜[2] 韩冬[1] 李海梅[1] 牛兰芹[1] 

机构地区：[1]河北工程学院理学院,邯郸056038 [2]天津大学化工学院,天津300072

出　　处：《河北建筑科技学院学报》2005年第3期4-7,共4页Journal of Hebei Institute of Architectural Science & Technology

基　　金：国家自然科学基金资助项目(20273047)

摘　　要：采用高温固相法合成了掺杂Co、Cr、La元素的尖晶石型锰酸锂Li1.02Co0.02M1xM2yMn1.98-x-yO4电池材料;X射线衍射(XRD)表征所合成的产物呈现出良好的尖晶石型结构材料;扫描电子显微镜(SEM)显示合成材料均具有良好的粒径分布(2～3μm)及外貌.以该活性物质作为锂离子电池正极材料,经充放电测试研究表明:掺杂的尖晶石型锰酸锂正极材料Li1.02Co0.02M1xM2yMn1.98-x-yO4能够更好地抑制尖晶石型锰酸锂材料的可逆容量在充放电过程中的衰减,循环性能有了很大改善,表现出更好的电化学可逆特性,100次循环后放电容量仍能保持初始容量的95%以上.作为锂离子电池正极材料LiCoO2的替代材料,该研究为锰酸锂尖晶石型正极材料的改性提供了一种新方法.The spinel materials Li1.02MxMn2-xO4 doped with Co^3＋ , Cr^3＋ and La^3＋ ions were prepared by solid-state reaction method. X-ray diffraction showed that the samples have perfect spinel structure. SEM indicated that the particles of the samples had uniform size （2 - 3 μm） and were distributed evenly. The results of the charge/discharge curves showed that Li1.02MxMn2-xO4 had better performance than the undoped materials according to the inhibition of decline of reversible capacity of spinel Li1.02MxMn2-xO4. Therefore, cycle performance had been improved so obviously that 95 % of the initial capacity were preserved respectively after 100 cycles. As cathode material of Lithium-ion battery, this doped-cation spinels is one of the most competitive substitutes for LiCoO2.

关 键 词：锂离子电池 掺杂尖晶石 正极材料 电化学性能 

分 类 号：O614[理学—无机化学]