Dependence of battery performance of spinel Li{sub 1+x}Mn{sub 2}O{sub 4} on the preparation method

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:162909

Yoshio, Masaki; Xia, Yongyao; Ikeda, Kazutaka; Noguchi, Hideyuki ^[1]

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1. Saga Univ. (Japan). Dept. of Applied Chemistry

The formation process of the spinel phase by the melt-impregnation method was extensively investigated by the pore volume distribution measurement. Two kinds of the spinel structure compounds Li{sub 1+x}Mn{sub 2}O{sub 4} optimized in this method were examined as a 4V cathode in a lithium nonaqueous cell. The first one has an initial charge capacity of 135--147 mAh/g and an unstable rechargeability with the characteristic two-step process, and another one delivers a slightly lower capacity of 105--120 mAh/g and ideal rechargeability with the quasi-one step process. These compounds preserve a capacity of more than 110 mAh/g for the first 100 cycles. The capacity fading on cycling of the former spinel only occurs at the second charge plateau in the rage of x < 0.4 in Li{sub x}Mn{sub 2}O{sub 4}, and is due to the unstable two-phase structure for lithium intercalation coexisting in this region. The excellent rechargeability for the later spinel results from a homogeneous reaction occurring over the entire intercalated region.

• OSTI ID: 162909
• Report Number(s): CONF-950412--; ISBN 1-55899-296-0
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
CATHODES
CHEMICAL ANALYSIS
CRYSTAL STRUCTURE
ELECTRIC BATTERIES
ELECTRIC CURRENTS
ELECTRIC POTENTIAL
ELECTROCHEMISTRY
EXPERIMENTAL DATA
HEAT TREATMENTS
IMPREGNATION
LATTICE PARAMETERS
LITHIUM OXIDES
MANGANESE OXIDES
OXIDATION
POROSITY
STOICHIOMETRY
SYNTHESIS
X-RAY DIFFRACTION