发明授权
US07897283B2 Non-aqueous secondary battery-use graphite composite particle, cathode active substance material containing IT, cathode and non-aqueous secondary battery 有权
非水二次电池用石墨复合颗粒,含有IT的正极活性物质材料,阴极和非水二次电池

Non-aqueous secondary battery-use graphite composite particle, cathode active substance material containing IT, cathode and non-aqueous secondary battery
摘要:
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/DS is more than 1 and 2 or less, wherein DL μm means a volume-based median size measured by a laser diffraction/scattering-type particle size distribution measuring apparatus, and DS μm 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/IA between an intensity IA of a maximum peak of 1580 cm−1 around and an intensity IB of a maximum peak of 1360 cm−1 around in a Raman spectrum.
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