Non-aqueous electrolyte battery

Details Non-aqueous electrolyte battery Non-aqueous electrolyte battery

1999-09-24

2001-11-27

Maples, John S. (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Include electrolyte chemically specified and method

C429S344000, C429S326000

Reexamination Certificate

active

06322930

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a non-aqueous electrolyte battery having a positive electrode, a negative electrode and an non-aqueous electrolyte. Specifically, the present invention relates to an improvement in the cycle characteristics of a non-aqueous electrolyte battery.
BACKGROUND OF THE INVENTION
High electromotive force non-aqueous electrolyte batteries which utilize oxidation and reduction of lithium have lately attracted attention as high capacity and high energy density batteries.
As the non-aqueous electrolyte for these types of batteries, there are generally used electrolytes in which a solute, for example, lithium hexafluorophosphate (LiPF
6
), lithium perchlorate (LiClO
4
), and the like, is dissolved in a solvent, for example, propylene carbonate, dimethyl carbonate and the like.
It has been proposed that acetyl propylene carbonate having an acetyl substituent group at the 3- or 4-position be used as a solvent of a non-aqueous electrolyte to increase current efficiency during charge-discharge cycles of the negative electrode (Japanese patent Laid-Open publication No. Sho 63-32870).
However, the non-aqueous electrolyte reacts with the negative electrode, etc. in the non-aqueous electrolyte battery described above. There are still problems that cycle characteristics are reduced.
OBJECT OF THE INVENTION
An object of the present invention is to solve the problems explained above. That is, the present invention prevents a non-aqueous electrolyte from reacting with a negative electrode, etc. and provides a non-aqueous electrolyte battery having excellent cycle characteristics.
SUMMARY OF THE INVENTION
The present invention provides a non-aqueous electrolyte battery having a positive electrode, a negative electrode and a non-aqueous electrolyte, wherein the non-aqueous electrolyte contains boric acid ester as a solvent.


REFERENCES:
patent: 5849432 (1998-12-01), Angell et al.
patent: 06-338321 A (1994-12-01), None
patent: 11-054133 A (1999-02-01), None
Michel W. Barsoum et al, “In situ determination of the kinetics of reaction between lithium and fast ion conducting lithium borate glasses”,Solid State Ionics, 18 & 19 pp. 388-392, 1986. (No Month).
J. Bartel et al., “A New Class of Electrochemically and Thermally Stable Lithium Salts for Lithium Battery Electrolytes”,J. Electrochem. Soc., vol. 142, pp. 2527-2531, 1995, Aug.
D. A. Hensley et al., “Scanning Force Microscopy Investigation of Surface Forces at the Tungsten Oxide/Lithium Borate Interface”,J. Electrochem. Soc., vol. 145, No. 2, pp. 669-675, 1998, Feb.

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