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Abstract

Provided are composite carbon particles capable of obtaining a lithium-ion secondary battery having good cycle characteristics and small electrode expansion. Composite carbon particles including a porous carbon material and a silicon component, the composite carbon particle having an average aspect ratio of 1.25 or less, and a ratio (I_Si/I_G) of a peak intensity (I_Si) in the vicinity of 470 cm⁻¹ to a peak intensity (I_G) in the vicinity of 1580 cm⁻¹ as measured by Raman spectroscopy of 0.30 or less, wherein the porous carbon material satisfies V₁/V₀>0.80 and V₂/V₀<0.10, when a total pore volume at a maximum value of a relative pressure P/P₀ is defined as V₀ and P₀ is a saturated vapor pressure, a cumulative pore volume at a relative pressure P/P₀=0.1 is defined as V₁, a cumulative pore volume at a relative pressure P/P₀=10⁻⁷ is defined as V₂ in a nitrogen adsorption test, and has a BET specific surface area of 800 m²/g or more.

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First Claim