Appeal 2007- 3662
Application 09/997,604
I. BACKGROUND
The invention relates to the production of lithium secondary batteries.
Claim 17 is illustrative of the subject matter on appeal:
17. A method of making a lithium secondary battery having low
internal resistance, comprising:
welding a plurality of current collecting portions directly to a positive
electrode, said positive electrode comprising a positive electrode active
material formed by a process comprising:
forming a raw material mixture comprising positive
electrode precursor material, said raw material mixture
comprising Li and Mn; and
heating said raw material mixture to a temperature and
for a time which is effective to convert said raw material
mixture into a positive electrode active material having a cubic
spinel structure, primary particles of the positive electrode
active material having a substantially octahedral shape
constituted mainly by flat crystal faces, said primary particles
including particles having at least one side of each flat crystal
face of length of 1 µm or more;
said battery having a capacity of 2 Ah or more.
The Examiner relies on the following prior art references to show
unpatentability:
Okada1 JP 08-217452 Aug. 27, 1996
Zhong US 5,700,597 Dec. 23, 1997
Watanabe US 6,106,975 Aug. 22, 2000
Zhong US 5,631,104 May 20, 1997
Manev US 5,961,949 Oct. 5, 1999
1 With regard to Okada, we have considered both the machine translation
and the translation provided by Schreiber Translations, Inc. We cite to the
Schreiber translation in the following discussion.
2
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