H - Electricity – 01 – M
Patent
H - Electricity
01
M
H01M 10/44 (2006.01) H01M 6/16 (2006.01) H01M 10/40 (2006.01)
Patent
CA 2347630
An initial charging operation is carried out by a charging step composed of two- stages or more to improve an initial charging and discharging efficiency, reduce the charge of wasteful materials and improve a high capacity and a high cyclic characteristic without deteriorating various kinds of battery properties. In order to realize the improvements, a nonaqueous solvent which is decomposed under a potential higher than the reduction and decomposition potential of a main solvent is included in electrolyte. This charging method is a method for achieving the addition effect of such a nonaqueous solvent as much as possible. As a specific means, the electrolyte to which vinylene carbonate is added is employed and a constant- current and constant-voltage charge under about 3.2 V is carried out for 1 to 2 hours before a battery is completely charged. Thus, a good coat can be formed on the surface of an anode while suppressing the quantity of electricity required for forming the coat.
Hara Tomitaro
Kita Akinori
Shibuya Mashio
Suzuki Yusuke
Gowling Lafleur Henderson Llp
Sony Corporation
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