Method for prolonging the life of lithium ion batteries

Details Method for prolonging the life of lithium ion batteries Method for prolonging the life of lithium ion batteries

2006-05-02

2006-05-02

Tibbits, Pia (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

Regulated discharging

Reexamination Certificate

active

07038426

ABSTRACT:
A method for reconditioning lithium ion batteries in-situ to restore their capacity. The battery capacity is reduced by a reversible mechanism. The process for reconditioning a battery includes providing a power source and connecting the power source to a lithium ion battery. The lithium ion battery is slowly discharged at a predetermined voltage sufficiently high so as not to damage the battery cells and sufficiently low so to completely extract all lithium from the negative electrode and fully reincorporate it in the positive electrode, while the battery is being completely discharged. After the battery has been completely discharged, power is provided to the battery from the power source to recharge the lithium ion battery so as to uniformly redistribute the lithium in the negative electrode. The discharge cycle is repeated a plurality of times. Upon completion of recharging, the capacity of the battery is restored.

REFERENCES:
patent: 5543245 (1996-08-01), Andrieu et al.
patent: 6239578 (2001-05-01), Schnell et al.
patent: 6433511 (2002-08-01), Bohne
patent: 6618644 (2003-09-01), Bean
patent: 6660428 (2003-12-01), Hall
patent: 6737830 (2004-05-01), Bean et al.
patent: 2002/0168567 (2002-11-01), Hall
patent: 2002/0187372 (2002-12-01), Hall et al.

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