Additives for improving cycle life of non-aqueous rechargeable l

Details Additives for improving cycle life of non-aqueous rechargeable l Additives for improving cycle life of non-aqueous rechargeable l

1998-03-03

2000-04-04

Nuzzolillo, Maria

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

429199, 429324, H01M 1024

Patent

active

060459484

ABSTRACT:
The loss in delivered capacity (fade rate) after cycling non-aqueous rechargeable lithium batteries can be reduced by incorporating a small amount of an improved additive in the battery. Improved additives include boron trifluoride (BF.sub.3), fluoboric acid (HBF.sub.4), or complexes thereof. The invention is particularly suited to lithium ion batteries. Complexes comprising BF.sub.3 and dietyl carbonate or ethyl methyl carbonate can be prepared which are particularly effective additives. Preferably, the additive is dissolved in the electrolyte.

REFERENCES:
patent: 3915743 (1975-10-01), Lauck
patent: 5437944 (1995-08-01), Kita et al.
patent: 5783333 (1998-07-01), Mayer

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