Polymerizable aromatic additives for overcharge protection in no

Details Polymerizable aromatic additives for overcharge protection in no Polymerizable aromatic additives for overcharge protection in no

1996-07-22

1999-03-09

Maples, John S.

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Include electrolyte chemically specified and method

429194, H01M 1040

Patent

active

058798340

ABSTRACT:
Non-aqueous rechargeable lithium batteries can be protected against overcharge abuse by incorporating small amounts of suitable aromatic additives into the electrolyte. The additives are electrochemically polymerized at abnormally high voltages, thereby increasing the internal resistance of the battery and thus protecting it. Aromatic additives such as biphenyl, 3-chlorothiophene, and furan are particularly suitable for certain lithium ion batteries. The additives need not and may preferably not polymerize during overtemperature abuse.

REFERENCES:
patent: 4489145 (1984-12-01), Abraham et al.
patent: 4943497 (1990-07-01), Oishi et al.
Matsuda et al., Journal of Power Sources, 54(2) Apr. (1995) 301-305.
Waltman, et al., "Electroactive Properties of Polyaromatic Molecules", J. Electrochem. Soc., vol. 131, No. 6, Jun. 1984, pp. 1452-1456.

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