COBALT-DOPING Li4-XCoXTi5O12 AS ANODE MATERIAL FOR LITHIUM-ION BATTERIES
Cobalt-doping Li4-xCoxTi5O12 (x=0, 0.1, 0.2, 0.3) materials were synthesized by a sol-gel method from Ti(OC4H9)4, LiOH.H2O and Co(CH3COO)2.4H2O. Cobalt-doping increases the lattice parameter and decreases the crystallinity of Li4-xCoxTi5O12.Cobalt substitution for Li deteriorates the lithium storage capacity of Li4Ti5O12, but enhances significantly the rate-capability and structural stability. The generation of mixed valence of Ti3+/Ti4+ caused by the replacement of Co for Li in Li4Ti5O12 can increase the electronic conductivity and alleviate the electrode polarization. Co-ions with high valency located on Li-site, however, may impede the Li-ions diffusion in Li4-xCoxTi5O12 during charge/discharge process and hence affect its specific capacity. Cobalt-doping improve the electrochemical reaction process of Li4-xCoxTi5O12 electrode.
Lithium-ion battery Li4Ti5O12 cobalt-doping rate capability
ZHIHONG TIAN HAILEI ZHAO JIE WANG ZHIFENG WANG YUEQING ZHAO
Departmentof Inorganic Nonmetallic Materials, School of Materials Science and Engineering, Universit Departmentof Inorganic Nonmetallic Materials, School of Materials Science and Engineering, Universit
国际会议
The 12th Asian Conference on Solid State Ionics(第十二届亚洲固态离子学会议暨第十五届中国固态离子学会议)
武汉
英文
588-596
2010-05-02（万方平台首次上网日期，不代表论文的发表时间）