Carbonaceous substance-coated graphite particles, negative electrode for lithium ion secondary battery and lithium ion secondary battery
Provided are carbonaceous substance-coated graphite particles that include: graphite particles; and carbonaceous coatings covering at least part of surfaces of the graphite particles, the carbonaceous substance-coated graphite particles have a maximum particle diameter of 30.0 to 90.0 μm, a pore volume V s of pores with a pore size of 7.8 to 36.0 nm is 0.009 to 0.164 cm 3 /g, and in a pore size distribution graph with the pore size being plotted on a horizontal axis and a dV/dP value obtained by differentiating the pore volume with the pore size being plotted on a vertical axis, a pore size P max with which the dV/dP value is maximized is 2.5 to 5.5 nm.
1. Carbonaceous substance-coated graphite particles comprising: graphite particles; and carbonaceous coatings covering at least part of surfaces of the graphite particles,
wherein the carbonaceous substance-coated graphite particles have a maximum particle diameter of 30.0 to 90.0 μm,
a pore volume V s of pores with a pore size of 7.8 to 36.0 nm is 0.009 to 0.164 cm 3 /g,
in a pore size distribution graph with the pore size being plotted on a horizontal axis and a dV/dP value obtained by differentiating the pore volume with the pore size being plotted on a vertical axis, a pore size P max with which the dV/dP value is maximized is 2.5 to 5.5 nm,
in a particle size distribution of primary particles that is obtained using X-ray computed tomography, a volume ratio of primary particles with an equivalent spherical diameter of not more than 0.8 μm is 3.0 to 21.0%, and
in a particle shape distribution of secondary particles that is obtained using X-ray computed tomography, a volume ratio of rod-shaped secondary particles is 2.6 to 65.0%.
2. The carbonaceous substance-coated graphite particles according to claim 1 , wherein an amount of the carbonaceous coatings is 0.1 to 15.0 parts by mass with respect to 100 parts by mass of the graphite particles.
3. The carbonaceous substance-coated graphite particles according to claim 1 , wherein the carbonaceous substance-coated graphite particles are used as a negative electrode material for a lithium ion secondary battery.
4. A negative electrode for a lithium ion secondary battery containing the carbonaceous substance-coated graphite particles according to claim 1 .
5. A lithium ion secondary battery including the negative electrode according to claim 4 .
6. The carbonaceous substance-coated graphite particles according to claim 2 , wherein the carbonaceous substance-coated graphite particles are used as a negative electrode material for a lithium ion secondary battery.
7. A negative electrode for a lithium ion secondary battery containing the carbonaceous substance-coated graphite particles according to claim 2 .
8. A lithium ion secondary battery including the negative electrode according to claim 7 .