Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Reexamination Certificate
2005-07-12
2005-07-12
Weiner, Laura (Department: 1745)
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
C429S231950, C429S231300, C429S223000, C429S224000, C429S232000, C252S520400, C252S521200
Reexamination Certificate
active
06916580
ABSTRACT:
A positive active material for a rechargeable lithium battery is provided. The positive active material comprises a lithiated intercalation compound and a coating layer formed on the lithiated intercalation compound. The coating layer comprises a solid-solution compound and an oxide compound having at least two coating elements, the oxide compound represented by the following Formula 1:in-line-formulae description="In-line Formulae" end="lead"?MpM′qOr (1)in-line-formulae description="In-line Formulae" end="tail"?wherein M and M′ are not the same and are each independently at least one element selected from the group consisting of Zr, Al, Na, K, Mg, Ca, Sr, Ni, Co, Ti, Sn, Mn, Cr, Fe, and V; 0<p<1; 0<q<1; and 1<r≦2, where r is determined based upon p and q. The solid-solution compound is prepared by reacting the lithiated intercalation compound with the oxide compound. The coating layer has a fracture toughness of at least 3.5 MPam1/2. A method of making the positive active material is also provided.
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Cho Jae-Phil
Kim Tae-Jun
Kim Yong-Jeong
Park Byung-Woo
Christie Parker and Hale, LLP
Samsung SDE Co., Ltd.
Weiner Laura
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