Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Reexamination Certificate
2011-03-01
2011-03-01
Alejandro, Raymond (Department: 1727)
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
C429S218100, C252S182100
Reexamination Certificate
active
07897283
ABSTRACT:
To provide a nonaqueous secondary battery ensuring that a charge-discharge irreversible capacity at an initial cycle is sufficiently small even when an active material layer comprising a negative electrode active material on a current collector is increased in a density for obtaining a high capacity.This object is attained by a graphite composite particle for a nonaqueous secondary battery, which satisfies the requirements (1) and (2):(1) DL/DSis more than 1 and 2 or less, wherein DLμm means a volume-based median size measured by a laser diffraction/scattering-type particle size distribution measuring apparatus, and DSμm means an average circle-equivalent particle size which is determined from a measured area S of particles each having a contour not overlapped with a contour of another particle in a SEM; and(2) a Raman R value is 0.04 or more and 0.14 or less, wherein the Raman R value means an intensity ratio IB/IAbetween an intensity IAof a maximum peak of 1580 cm−1around and an intensity IBof a maximum peak of 1360 cm−1around in a Raman spectrum.
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U.S. Appl. No. 12/521,372, filed Jun. 26, 2009, Matsumoto, et al.
Matsumoto Hitoshi
Satoh Hideharu
Alejandro Raymond
Mitsubishi Chemical Corporation
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Tokai Carbon Co., Ltd.
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