STUDIES ON PURE AND Co-DOPED LiMn2O4 PREPARED BY NaCl:KCl MOLTEN SALT METHOD
Pure and Co-doped (0.17) LiMn2O4 are prepared using NaCl:KCl (1:1) eutectic melt at T=700850 ℃. They are characterized by X-ray diffraction (XRD), Rietveld refinement, Scanning Electron Microscopy (SEM), density and BET surface area. Single-phase compounds with cubic spinel structure are obtained in all cases. The lattice parameter (a~8.23A) of LiMn2O4 does not vary with the synthesis temperature, and the Co-doped compound shows a smaller value (a~8.21A). SEM shows 1-5 m sized spherical particles with～20 nm nanosized aggregates. Electrochemical properties are evaluated at ambient (24 ℃) and elevated (50 ℃) temperatures in cells with Li-metal as the counter electrode by cyclic voltammetry (CV), and galvanostatic cycling. CV results show characteristic redox peaks around 3.9/4.1 V and 4.0V/4.2 V vs. Li. Galvanostatic cycling at 0.25 and 1 C-rates in the voltage range, 3.5-4.3V vs. Li up to 100 cycles showed that Co-doping significantly reduces the capacity-fading at 50 刟C in comparison to bare LiMn2O4.
X. ZHAO M.V. REDDY H. X . LIU G.V. SUBBA RAO B.V.R. CHOWDARI
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University Department of Physics, National University of Singapore, 117542 Singapore State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University
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
725-732
2010-05-02（万方平台首次上网日期，不代表论文的发表时间）