锂离子电池正极材料Li_(3+x)V_2(PO_4)_(3-x)(SiO_4)_x(0≤x≤0.3)合成及电化学性能  

Synthesis and electrochemical properties of a novel cathode material Li_(3+x)V_2(PO_4)_(3-x)(SiO_4)_x(0≤x≤0.3) for lithium ion battery

作　　者：时喜喜[1,2] 任丽彬[1] 孙文彬[1] 张联齐[3] 刘兴江[1] 

机构地区：[1]中国电子科技集团公司第十八研究所,天津300381 [2]天津大学化工学院,天津300072 [3]天津理工大学材料科学与工程学院,天津300384

出　　处：《电源技术》2011年第9期1050-1052,共3页Chinese Journal of Power Sources

摘　　要：采用溶胶凝胶结合碳热还原法制备了一种新型锂离子电池正极材料。该材料中,硅酸根取代了磷酸钒锂中的部分磷酸根,得到组成为Li3+xV2(PO4)3-x(SiO4)x(0≤x≤0.3)的材料。采用沥青作为碳源,碳既是还原剂又作为导电剂。比较了x=0,0.05,0.1,0.2,0.3时,材料的库仑效率,容量和循环性能。当x=0.1时,库仑效率最高,其次是x=0.05时。x=0时,材料的容量最高,R25/1最大;x=0.05时,R25/5最大。结果表明,在磷酸钒锂中采用硅酸根取代部分的磷酸根可以有效地提高材料的库仑效率和循环稳定性。A novel cathode material for lithium ion battery was synthesized by a sol-gel method combined with a carbothermal reduction method. In this new material, phosphate in lithium vanadium phosphate was partially substituted by silicate, with a composition of Li3＋xV2（PO4）3-x（SiO4）x（0≤x≤0.3）. Pitch was used as a carbon source, which provided carbon as both reducing agent and conductive agent. The coulomb efficiency, capacity and cycle performance of the materials were compared with x=- 0,0.05,0.1,0.2,0.3. It is concluded that the material with x=0.1 has the highest coulomb efficiency, and the second is that with x= 0.05.The material with x=0 possesses the highest capacity and R25/1, and the material with x= 0.05 has the highest R25/5. The results show that phosphate partially substituted by silicate can effectively improve the coulomb efficiency and capacity maintenance.

关 键 词：锂离子电池 正极材料 溶胶凝胶法 碳热还原法 

分 类 号：TM912.9[电气工程—电力电子与电力传动]