Appeal 2007-0693
Application 10/188,519
1 manufacturing the negative electrode.” (Specification 1:12-13.) According
2 to Applicants, the invention “provides batteries having a superior high-rate
3 discharge characteristic, especially the discharge characteristic at low
4 temperatures, and a superior charge-discharge cycle characteristic in a large
5 quantity and with stability.” (Specification 3:4-7.)
6 Representative claims 1, 5, and 16 read as follows:
7 1. A non-aqueous electrolyte secondary battery
8 comprising a rechargeable positive electrode, a non-aqueous
9 liquid electrolyte, and a negative electrode comprising a
10 negative electrode on a current collector;
11 in which:
12 the negative electrode material comprises: a mixture of
13 (1) a carbon material that is capable of absorbing and desorbing
14 lithium, and (2) a binder;
15 the carbon material is a graphite material;
16 the binder consists essentially of at least one material
17 selected from the group consisting of ethylene-propylene-
18 acrylic acid copolymers, ethylene-propylene-acrylate
19 copolymers, ethylene-propylene-methyl acrylic acid
20 copolymers, ethylene-propylene-methacrylic acid copolymers,
21 ethylene-propylene-methacrylate copolymers, and ethylene-
22 propylene-methyl methacrylic acid copolymers; and
23 the binder has an ethylene-propylene weight content in
24 the range of 70-95%.
25
26 5. The non-aqueous electrolyte secondary battery of
27 claim 1 wherein the binder comprises –COO- Na+ or –COO- K+
28 groups.
29
30 16. The non-aqueous electrolyte secondary battery of
31 claim 1 wherein the binder is an ethylene-propylene-methyl
32 acrylic acid copolymer and the binder has an ethylene to
33 propylene weight % between 80:20 and 20:80.
34
2
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