Appeal 2007-1524
Application 09/770,725
1 “an electrode unit produced by winding or laminating a positive
2 electrode and a negative electrode via a separator,” all as recited
3 in appealed claim 1, is not contested.
4 10. Compared to the subject matter of appealed claim 1, Takami
5 does not disclose “a cumulative concentration of water (H2O)
6 released from both of the said positive electrode and said
7 negative electrode in relation to the weight of said electrode
8 unit, exclusive of weight of current collectors, is suppressed to
9 5,000 ppm or lower in case of heating both electrodes at 25 to
10 200°C and to 1,500 ppm or lower in case of heating said
11 electrodes at 200 to 300°C.”
12 11. Takami discloses that water is one of the main impurities in the
13 electrolyte solvent that causes “the formation of an insulating
14 film on the surface of a graphitized substance, thereby
15 increasing the surface resistance of the electrodes.” (Takami,
16 10:25-29.)
17 12. Takami discloses that the formation of the insulating film on
18 the surface of the graphitized substance as a result of water
19 impurities “may give a bad influence to the battery, thereby not
20 only deteriorating the cycle life or capacity thereof, but also
21 increasing the-self-discharge during a high temperature (60o C.
22 or more) storage of the battery.” (Takami, 10:30-35.)
23 13. Accordingly, Takami discloses that it would be desirable to
24 eliminate water as an impurity as much as possible, such that
25 the water content in the electrolyte does not exceed 50 ppm.
26 (Takami, 10:38-39.)
6
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