The spinel phases LiM{sub y}Mn{sub 2{minus}y}O{sub 4} (M = Co, Cr, Ni) as the cathode for rechargeable lithium batteries
- Tokyo Inst. of Tech. (Japan). Dept. of Chemical Engineering
To improve the cycle performance of spinel LiMn{sub 2}O{sub 4} as the cathode of 4 V class lithium secondary batteries, the quaternary spinel phases LiM{sub y}Mn{sub 2{minus}y}O{sub 4} (M = Co, Cr, Ni; y = 1/12, 1/9, 1/6, 1/3) were prepared at 750 C in air. X-ray diffraction and electrochemical studies were carried out using the Li{vert_bar}Li{sub x}M{sub y}Mn{sub 2{minus}y}O{sub 4} cells. These cathodes were more tolerant to repeated lithium extraction and insertion than a standard LiMn{sub 2}O{sub 4} spinel electrode in spite of a small reduction in the initial capacity. Considering both cycle life and capacity density, LiCo{sub 1/6}Mn{sub 11/6}O{sub 4} showed good cycle performance with an energy density of 370 Wh/kg at the 300th cycle. The improvement in cycling performance is attributed to the stabilization in the spinel structure by the doped metal cations.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 201403
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 1 Vol. 143; ISSN 0013-4651; ISSN JESOAN
- Country of Publication:
- United States
- Language:
- English
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