Development of structural stability and the electrochemical performances of 'La' substituted spinel LiMn2O4 cathode materials for rechargeable lithium-ion batteries

作者：Arumugam D; Kalaignan G Paruthimal^*; Manisankar P

来源：Solid State Ionics, 2008, 179(15-16): 580-586.

DOI：10.1016/j.ssi.2008.04.010

• lithium-ion batteries
• LiMn2O4
• La substituted
• XRD
• Raman
• SEM
• Galvanostatic charge/discharge
• Cyclic voltammetry

The LiLaxMn2-xO4 (x = 0.00 to 0.10) cathode materials for rechargeable lithium ion batteries were synthesized by simple sol-gel technique using aqueous solutions of metal nitrates and succinic acid as the chelating agent. The gel precursors of metal succinates were dried in vacuum oven for 10 h at 110 degrees C. After drying, the gel precursors were ground and heated at 900 degrees C. The structural characterization was carried out by X-ray powder diffraction and Laser Raman spectroscopy. The sample exhibited a well-defined spinel structure and the lattice parameter was linearly increased with the increasing lanthanum contents in LiLaxMn2-xO4. Surface morphology of the synthesized materials was determined by Scanning electron microscope and it was found that the cathode materials consisted of highly-ordered single crystalline particles with cubic spinel structure. Electrochemical properties were characterized by the assembled test cells using Galvanstatic charge/discharge studies which were carried out at a current rate 0.1C and Cyclic voltammetry was carried out in the potential range of 2.75 to 4.5 V at a scan rate 0.1 mVs(-1). Among them, lanthanum doped spinel LiLa0.05Mn1.95O4 has improved the structural stability, high reversible capacity and excellent electrochemical performance of rechargeable lithium batteries.

• 出版日期2008-6-30