Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Include electrolyte chemically specified and method
Patent
1995-10-31
1998-02-03
Kalafut, Stephen
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Include electrolyte chemically specified and method
429198, 429199, H01M 1040
Patent
active
057142807
ABSTRACT:
A lithium secondary battery comprising a positive electrode, a negative electrode and an organic electrolyte, and the electrolyte comprises a solvent mixture of at least one kind of fluorine substituted propylene carbonates used as a first solvent and at least one kind of low viscous solvents for lowering the viscosity of fluorine substituted propylene carbonates, used as a second solvent. At least one solvent selected from a group of dimethyl carbonate, methyl ethyl carbonate, diethyl carbonate, methyl propyl carbonate and methyl butyl carbonate is preferably used as the second solvent. There can be obtained resultant electrolytes which are excellent in self-extinguishing ability, resulting in high safety and easy in handling, and also excellent in battery performance, discharge characteristics at a low temperature, charge/discharge efficiency of the negative electrode at the initial stage of charge/discharge cycles, energy density, and suppression of the deterioration of the characteristics of the positive electrode, made of one kind of lithium containing complex oxides, during recharging cycles at a deep or large charging depth. When 4-trifluoromethyl-ethylene carbonate is used, the above-mentioned characteristics can be much more improved.
REFERENCES:
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patent: 5529859 (1996-06-01), Shu et al.
JP-A-62 290071 -Abstract- Matsushita Electric Ind Co Ltd. Dec. 16, 1987, vol. 012 No. 187 (E-615), May 31, 1988.
JP-A-62 290072 -Abstract- Matsushita Electric Ind Co Ltd. Dec. 16, 1987, vol. 012 No. 187 (E-615), May 31, 1988.
Masoka et al., Fluorine Containing Cyclic Carbonates, Patent Abstracts of Japan, Kokai patent application 63-68583, vol. 12, No. 299, C520, Aug. 15, 1988.
Yokoyama et al., "Novel Carbonate Compounds, No-Aqueous Electrolytic Solutions and Batteries", European Patent Application 0 599534, Jun. 1, 1991.
Nakano Kenji
Yamamoto Masahiro
Chaney Carol
Furukawa Denchi Kabushiki Kaisha
Kalafut Stephen
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