X-ray powder diffraction investigation of lithium manganese spinel oxides with cubic, tetragonal and orthorhombic structure.
Adam Mickiewicz University, Faculty of Chemistry, Grunwaldzka 6, Poznań 60-780, Poland
Lithium-ion rechargeable batteries find wide application in modern portable electronic devices. LiMn2O4 spinel is the most attractive cathode material for lithium-ion batteries due to its low cost, low toxicity and high energy density. An important problem prohibiting it from wider use as a cathode material is capacity fading during cycling. Jahn-Teller distortion and spinel solution are two main causes for the capacity loss. The charge ordering of Mn4+ and Mn3+ ions and Jahn-Teller distortion induces a phase transformation near the room temperature. The partial substitution of Li+ ions for manganese reduces the concentration of Mn3+ ions, suppresses the Jahn-Teller effect, and the cubic spinel phase can be retained at low temperature.
Presentation: poster at E-MRS Fall Meeting 2003, Symposium B, by Paweł Piszora
See On-line Journal of E-MRS Fall Meeting 2003
Submitted: 2003-05-07 14:35 Revised: 2009-06-08 12:55