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8323825 
Journal Article 
A rechargeable lithium battery employing a porous thin film of Cu3+δMo6S7.9 
Wakihara, M; Uchida, T; Morishita, T; Wakamatsu, H; Taniguchi, M 
1987 
Yes 
Journal of Power Sources
ISSN: 0378-7753 
20 
3-4 
199-204 
English 
Porous, thin films of copper molybdenum sulfides (Cu3+δMo6S7.9), that have been prepared by the technique of painting and subsequent reaction with mixed H2/H2S gases at 500 °C, have been used as a cathode material for lithium secondary batteries. The test cell comprised: Li/2 M LiClO4 in PC-THF (4:6)/Cu3+δMo6S7.9 (porous, thin film). The discharge reaction proceeded via the intercalation of lithium ions into the structural interstices of the cathode material. The first discharge curve of the cell showed that the porous film could incorporate up to ∼18 lithium ions per formula unit. The capacity of the thin film was four times higher than that previously reported for powder or pressed-pellet electrodes. The theoretical energy density was 675 W h kg-1, i.e., higher than that of TiS2 (455 W h kg-1) which is one of the best materials for high-energy lithium batteries. From X-ray diffraction studies of the lithium incorporated in the thin film at each discharge step, it is suggested that there are four incorporation reactions of lithium ions into the cathode. Finally, cycling tests have been conducted at room temperature. © 1987.