Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Reexamination Certificate
2004-03-30
2009-12-29
Dove, Tracy (Department: 1795)
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
C429S231500, C429S231600, C029S623100
Reexamination Certificate
active
07638240
ABSTRACT:
Provided are a cathode material capable of improving battery characteristics by improving its structural stability, a method of manufacturing the cathode material, and a battery using the cathode material. A cathode comprises a complex oxide represented by LiaMnbCrcAl1−b−cOdor Li1+e(MnfCrgM1−f−g)1−eOh. the values lof a through h are within a range of 1.0<a<1.6, 0.5<b+c<1, 1.8<d<2.5, 0<e<0.4, 0.2<f<0.5, 0.3<g<1, f+g<1 and 1.8<h<2.5, and M is at least one kind selected from the group consisting of Ti, Mg and Al. The crystalline structure can be stabilized by Ti, Mg or Al, and charge-discharge cycle characteristics can be improved. Moreover, the charge capacity can be improved by an excessive amount of lithium, and even after charge, a certain amount of lithium remains in the crystalline structure, so the stability of the crystalline structure can be further improved.
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patent: 2001122628 (2001-05-01), None
patent: 2003068282 (2003-03-01), None
Jaephil Cho and Byungwoo Park; Li2+xMn0.91Cr1.09O4 Cathode Materials for Li-Ion Cells; Electrochemical and Solid-State Letters; 3 (8) 355-358; 2000.
Brett Ammundsen et al.; Local Structure and First Cycle Redox Mechanism of Layered Li1.2Cr0.4Mn0.4O2 Cathode Material; Journal of the Electrochemical Society; 149 (4) A431-A436; 2002.
Dove Tracy
Sonnenschien Nath & Rosenthal LLP
Sony Corporation
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