IMPROVEMENT OF ELECTROCHEMICAL PROPERTIES OF TITANIUM-DOPED TERNARY LAYERED CATHODE MATERIALS PREPARED BY THERMAL POLYMERIZATION
To improve the electrochemical properties of LiNi1/3Co1/3Mn1/3O2, Ti doped cathode materials, LiNi1/3Co1/3Mn1/3-xTixO2 (x=0, 0.01, 0.025, 0.05), are synthesized via a thermal polymerization method. Their crystal structure, morphology and electrochemical behavior are investigated by XRD, SEM, galvanostatic charge-discharge cell cycling. The lithium ion diffusion coefficient (DLi+) and cell impedance are measured by galvanostatic intermittent titration technique (GITT) and direct current (DC) interruption method. All the prepared compounds have a hexagonal α-NaFeO2 structure and the lattice parameters increase monotonously with increasing the Ti content. Electrochemical tests results indicate that a small amount of Ti substitution leads to a slightly decreased specific capacity, but with enhanced value of DLi+, lower DC resistance and improved cyclability. Moreover, the composition LiNi1/3Co1/3Mn1/3-0.01Ti0.01O2 gives the optimal electrochemical performance with a capacity retention of 87.6% after 100 cycles.
C.X. DING Y.C. BAI C.H. CHEN
CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineeri CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineeri
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
551-560
2010-05-02（万方平台首次上网日期，不代表论文的发表时间）