An improved Li/Li sub x CoO sub 2 rechargeable cell

Journal Article · Sat Jul 01 04:00:00 EDT 1989 · Journal of the Electrochemical Society; (USA)

OSTI ID:6839907

Chun, D; Ebner, W B; Lin, H W ^[1]; Plichta, E; Slane, S; Uchiyama, M; Salomon, M ^[2]

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1. Honeywell Power Services Center, Horsham, PA (US)
2. U.S. Army Electronics Technology and Devices Lab., Power Sources Div., Ft. Monmouth, NJ (US)

This paper reports how improvement of the cycling behavior of the Li/Li{sub x}CoO{sub 2} cell has been brought about by the use of esters and alkyl carbonate-based mixed solvents, and by physical modifications of the cathode structure. Binary solvent mixtures of methyl formate with either dimethyl carbonate, diethyl carbonate, or CO{sub 2} and LiAsF{sub 6} electrolyte exhibit superior resistance towards solvent oxidation as well as improved lithium cycling efficiencies. Use of these mixed solvents with newly developed thin cathodes has resulted in stable Li/Li{sub x}CoO{sub 2} cells which can be cycled more than 100 times at current densities of 1-10 mA cm{sup {minus} 2}, and at an average cell discharge voltage of between 3.9 and 3.7V. Due to the high rate of solid-state diffusion of Li{sup +}, the Li{sub x}CoO{sub 2} cathode can be charged at rates of up to 2 mA cm{sup {minus} 2} over at least 10 deep charge and discharge cycles.

• OSTI ID: 6839907
• Journal Information: Journal of the Electrochemical Society; (USA), Journal Name: Journal of the Electrochemical Society; (USA) Vol. 136:7; ISSN 0013-4651; ISSN JESOA
• Country of Publication: United States
• Language: English

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