Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Patent
1997-08-14
2000-06-20
Nuzzolillo, Maria
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
429212, H01M 462
Patent
active
060776242
ABSTRACT:
The methods and compositions of the invention provide two solutions to reduce the reactivity of VDF-based copolymers to lithiated graphite. The two approaches can be used separately or combined. In one embodiment, the relative proportion of the VdF and the other fluorinated monomer (OFM, i.e. HFP) in the copolymer is significantly reduced below conventional formulations in order to reduce the reactivity of the copolymer. In a second approach, the reactivity of the copolymer, over a broad range of monomer VdF:OFM molar ratios, is reduced by deactivating the reactive sites on the copolymer, thereby blocking the ability to undergo undesired reaction during cell operation. These methods and compositions have heretofore not been proposed and are of primary importance in preventing large exothermic reaction which can lead to thermal runaway when conventional polymer formulations are utilized in batteries in the presence of reactive components such as lithiated graphite.
REFERENCES:
patent: 3876654 (1975-04-01), Pattison
patent: 3894118 (1975-07-01), Aronoff et al.
patent: 4200568 (1980-04-01), Trautvetter et al.
patent: 4489196 (1984-12-01), Schmiegel
patent: 4496682 (1985-01-01), Schmiegel
patent: 4868234 (1989-09-01), Tabb
patent: 5415958 (1995-05-01), Takahashi et al.
patent: 5418091 (1995-05-01), Gozdz et al.
patent: 5429891 (1995-07-01), Gozdz
patent: 5456000 (1995-10-01), Gozdz et al.
patent: 5460904 (1995-10-01), Gozdz
patent: 5468571 (1995-11-01), Fujimoto et al.
patent: 5739234 (1998-04-01), Kashio et al.
W.W. Schmigel, "Crosslinking of Elastomeric Vinylidene Fluoride Copolymers with Nucleophiles," Die Angewandte Makromolekulare Chemie, vol. 76/77, 39-65 (1979) No month.
Barker Jeremy
Kelley Tracy E.
Mitchell Porter H.
Nuzzolillo Maria
Ruthkosky Mark
Valence Technology Inc.
LandOfFree
Lithium ion cells with improved thermal stability does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Lithium ion cells with improved thermal stability, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lithium ion cells with improved thermal stability will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1850543