Lithium secondary cells and methods for preparing active materia

Details Lithium secondary cells and methods for preparing active materia Lithium secondary cells and methods for preparing active materia

1996-10-29

1999-02-16

Kalafut, Stephen

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

4234494, 423460, H01M 458

Patent

active

058718648

ABSTRACT:
A lithium secondary cell wherein a carbon material treated with a fluorinating agent and having substantially no C-F covalent bond, is used as an active material for negative electrode, provides a secondary cell having improved cell life. Further, a lithium secondary cell wherein a carbon material treated with a fluorinating agent and having an amount of fluorine extractable with an aqueous alkaline solution being at most 0.05 wt %, is used as an active material for negative electrode, or a lithium secondary cell wherein a carbon material treated with a fluorinating agent and containing lithium, is used as an active material for negative electrode, provides a secondary cell which is free from a problem of expansion of the casing during charging due to fluorine remaining in a small amount in the cell.

REFERENCES:
patent: 4565649 (1986-01-01), Vogel
patent: 4780112 (1988-10-01), Lloyd et al.
patent: 5328782 (1994-07-01), Binder et al.
patent: 5527643 (1996-06-01), Sonobe et al.
patent: 5556723 (1996-09-01), Ohsaki et al.
patent: 5589289 (1996-12-01), Zhang et al.
patent: 5622793 (1997-04-01), Iijima et al.

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