Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Patent
1994-03-16
1996-08-13
Nuzzolillo, M.
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
429114, 429197, H01M 402
Patent
active
055454682
ABSTRACT:
A rechargeable lithium cell comprises a cathode having a discharge potential not less than 2 V relative to a Li/Li.sup.+ anode, an anode capable of doping and un-doping lithium and made of a material comprising a lithium titanate having a spinel structure and represented by the general formula, LixTiyO.sub.4 wherein 0.8.ltoreq.x.ltoreq.1.4 and 1.6.ltoreq.y.ltoreq.2.2, a separator separating the cathode and the anode from each other, and an electrolytic solution impregnated at least in the separator and dissolving a lithium salt in a non-aqueous solvent. When subjected to X-ray diffraction analysis, the material has peaks at least at 4.84.+-.0.02 angstroms, 2.53.+-.0.02 angstroms, 2.09.+-.0.02 angstroms and 1.48.+-.0.02 angstroms and a ratio of a peak intensity at 4.84.+-.0.02 angstroms and a peak intensity at 1.48.+-.0.02 angstroms of 100:30.+-.10. The material may consist of the lithium titanate or mixed crystals of the lithium titanate and rutile-type titanium dioxide. A process for making the anode is also described.
REFERENCES:
patent: 4507371 (1985-03-01), Thackeray et al.
patent: 5147739 (1992-09-01), Beard
patent: 5160712 (1992-11-01), Thackeray et al.
patent: 5187033 (1993-02-01), Koshiba
"Metal Oxides of Group I and IV as Cathode Materials for Nonaqueous Lithium Cells" The Electrochemical Society of Japan; vol. 46, No. 7, Jul. 1978; pp. 407-410.
"Structure and Electrochemistry of the Spinel Oxides LiTi204 and Li4/3Ti5/304 by M. K. Colbow, et al," Journal of Power Sources, vol. 26, No. 3/4, May 16, 1989, pp. 397-402.
Structure & Electrochemistry of the Spinel Oxide Liti.sub.2 O4 +Li 4/3 Ti5.sub.3 O4 by M. K. Colbow et al, Journal of Power Sources, vol. 26, Nov. 3/4, May 16, 1981.
Asaka Emi
Koshiba Nobuharu
Nakanishi Makoto
Takata Kenichi
Matsushita Electric - Industrial Co., Ltd.
Nuzzolillo M.
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