Composite carbon particles and use thereof
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 V 1 /V 0 >0.80 and V 2 /V 0 <0.10, when a total pore volume at a maximum value of a relative pressure P/P 0 is defined as V 0 and P 0 is a saturated vapor pressure, a cumulative pore volume at a relative pressure P/P 0 =0.1 is defined as V 1 , a cumulative pore volume at a relative pressure P/P 0 =10 −7 is defined as V 2 in a nitrogen adsorption test, and has a BET specific surface area of 800 m 2 /g or more.
1. Composite carbon particles comprising 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 V 1 /V 0 >0.80 and V 2 /V 0 <0.10,
when a total pore volume at a maximum value of a relative pressure P/P 0 is defined as V 0 and P 0 is a saturated vapor pressure,
a cumulative pore volume at a relative pressure P/P 0 =0.1 is defined as V 1 ,
a cumulative pore volume at a relative pressure P/P 0 =10 −7 is defined as V 2 in a nitrogen adsorption test,
and has a BET specific surface area of 800 m 2 /g or more.
2. The composite carbon particles according to claim 1 , wherein the porous carbon material satisfies V 3 /V 0 >0.50, when a cumulative pore volume at the relative pressure P/P 0 =10 −2 is defined as V 3 in the nitrogen adsorption test.
3. The composite carbon particles according to claim 1 , wherein the silicon component is adhered to inner wall of pores of the porous carbon material.
4. The composite carbon particles according to claim 1 , wherein a 50% particle size (D V50 ) in a volume-based cumulative particle size distribution by laser diffraction method is 4.0 μm or more and 30.0 μm or less, a 10% particle size (D V10 ) is 1.0 μm or more, and the BET specific surface area is 0.50 m 2 /g or more and 40.0 m 2 /g or less.
5. The composite carbon particles according to claim 1 , wherein an R value (I D /I G ), which is a ratio of a peak intensity (I D ) in the vicinity of 1350 cm-1 to a peak intensity (I G ) in the vicinity of 1580 cm −1 in a Raman spectrum, is 0.80 or more and 1.50 or less.
6. The composite carbon particles according to claim 1 , wherein in an XRD pattern using a Cu-Kα ray, a full width at half maximum of a peak of a 111 plane of Si is 3.00° or more and (peak intensity of a 111 plane of SiC)/(peak intensity of the 111 plane of Si) is 0.01 or less.
7. The composite carbon particles according to claim 1 , wherein a content of the silicon component in the composite carbon particles is 15% by mass or more and 85% by mass or less.
8. The composite carbon particles according to claim 1 , wherein the composite carbon particle has an average circularity of 0.95 or more and 1.00 or less.
9. The composite carbon particles according to claim 1 , further comprising inorganic particles and a polymer on a portion or the entire surface of the composite carbon particles, wherein the inorganic particles contain one or more selected from graphite and carbon black, and a content of the polymer is 0.1 to 10.0% by mass.
10. An electrode material for a lithium-ion secondary battery comprising the composite carbon particles according to claim 1 .
11. A negative electrode material comprising the composite carbon particles according to claim 1 .
12. A negative electrode mixture layer comprising the negative electrode material according to claim 11 .
13. A lithium-ion secondary battery comprising the negative electrode mixture layer according to claim 12 .