Synthesis and electrochemical properties of nonstoichiometric LiAl{sub x}Mn{sub 2-x}O{sub 4-{delta}} as cathode materials for rechargeable lithium ion battery
- Department of Applied Chemistry, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8552 (Japan)
Nonstoichiometric spinel oxides, LiAl{sub x}Mn{sub 2-x}O{sub 4-{delta}} (x=0.1,0.2), were synthesized under controlled partial pressure of oxygen, and their elecrochemical performances were investigated. As an Al content increases, solubility limit of the oxygen nonstoichiometry, {delta}, increased, while partial molar enthalpy {delta}H-bar {sub O{sub 2}} of the formation of oxygen nonstoichiometry decreased. Cycle performance of LiAl{sub x}Mn{sub 2-x}O{sub 4} showed significant improvement comparing with that of LiMn{sub 2}O{sub 4} cathode. However, the decrease of theoretical capacity was accompanied with Al doping. Nonstoichiometric LiAl{sub x}Mn{sub 2-x}O{sub 4-{delta}} showed the increase in capacity with keeping good cycle performances as well as stoichiometric LiAl{sub x}Mn{sub 2-x}O{sub 4}. Although the introduction of oxygen nonstoichiometry leads to the increase of Mn{sup 3+} which is known as Jahn-Teller ion, DSC curves for LiAl{sub x}Mn{sub 2-x}O{sub 4-{delta}} showed no exothermic peak due to phase transition arising from Jahn-Teller distortion around room temperature.
- OSTI ID:
- 20902479
- Journal Information:
- Journal of Solid State Chemistry, Vol. 179, Issue 11; Other Information: DOI: 10.1016/j.jssc.2006.07.023; PII: S0022-4596(06)00418-X; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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