Manganese-lithium ion electrolytic cell

Details Manganese-lithium ion electrolytic cell Manganese-lithium ion electrolytic cell

1999-07-14

2001-09-11

Weiner, Laura (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

C429S217000, C429S218100, C429S221000, C429S223000, C429S231500

Reexamination Certificate

active

06287727

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a lithium ion electrolytic cell using a manganic material.
2. Description of Relevant Art
There are known a cobalt-lithium ion electrolytic cell using lithium cobaltate and a manganese-lithium ion electrolytic cell using lithium manganate, as a positive electrode of a secondary electrolytic cell.
SUMMARY OF THE INVENTION
While the cost of the material of a manganese-lithium ion electrolytic cell is lower than that of the material of a cobalt-lithium ion electrolytic cell, manganese (Mn) ion in the positive electrode active material of the former is high in the dissolution into its electrolytic solution. Moreover, the lifetime of the manganese-lithium ion electrolytic cell is short.
An object of the present invention is to suppress the dissolution of Mn to prevent the deterioration of a manganese-lithium ion electrolytic cell and make its lifetime longer.
To achieve the object described above, the present invention provides a manganese-lithium ion cell, comprising: a positive electrode comprising: positive electrode active material granules which are each composed of lithium manganate; and a first surface layer is formed on each of the positive electrode active material granules and is to transmit lithium (Li) ion but not manganese (Mn) ion therethrough.


REFERENCES:
patent: 5705291 (1998-01-01), Amatucci et al.
patent: 5789114 (1998-08-01), Adachi et al.
patent: 5856044 (1999-01-01), McLin et al.
patent: 5916516 (1999-06-01), Kolb

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