NEGATIVE ELECTRODE MATERIAL FOR LITHIUM ION SECONDARY BATTERY, NEGATIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERY, AND LITHIUM ION SECONDARY BATTERY
A negative electrode material for a lithium ion secondary battery includes particles in a state in which a plurality of flat graphite particles are aggregated or bonded, and in the negative electrode material, with respect to a volume-based particle diameter measured by a laser diffraction/scattering method, a cumulative value at 9.516 μm is 8.0% or less, a standard deviation of a particle size distribution is 0.22 or less, and a specific surface area is 3.0 m 2 /g or less.
1 . A negative electrode material for a lithium ion secondary battery, the negative electrode material comprising particles in a state in which a plurality of flat graphite particles are aggregated or bonded,
wherein, with respect to a volume-based particle diameter measured by a laser diffraction/scattering method, a cumulative value at 9.516 μm is 8.0% or less, a standard deviation of a particle size distribution is 0.22 or less, and a specific surface area is 3.0 m 2 /g or less.
2 . The negative electrode material for a lithium ion secondary battery according to claim 1 , wherein a graphitization degree of the negative electrode material is 93% or more.
3 . The negative electrode material for a lithium ion secondary battery according to claim 1 , wherein the specific surface area is from 0.5 m 2 /g to 2.5 m 2 /g.
4 . The negative electrode material for a lithium ion secondary battery according to claim 1 , wherein a springback rate of a composition layer containing the negative electrode material for a lithium ion secondary battery is from 2.0% to 4.0%.
5 . A negative electrode for a lithium ion secondary battery, the negative electrode comprising:
a current collector; and
a negative electrode material layer containing the negative electrode material for a lithium ion secondary battery according to claim 1 , disposed on the current collector.
6 . A lithium ion secondary battery, comprising:
a positive electrode;
the negative electrode for a lithium ion secondary battery according to claim 5 ; and
an electrolyte.
7 . The negative electrode material for a lithium ion secondary battery according to claim 2 , wherein the specific surface area is from 0.5 m 2 /g to 2.5 m 2 /g.
8 . The negative electrode material for a lithium ion secondary battery according to claim 2 , wherein a springback rate of a composition layer containing the negative electrode material for a lithium ion secondary battery is from 2.0% to 4.0%.
9 . The negative electrode material for a lithium ion secondary battery according to claim 3 , wherein a springback rate of a composition layer containing the negative electrode material for a lithium ion secondary battery is from 2.0% to 4.0%.
10 . The negative electrode material for a lithium ion secondary battery according to claim 7 , wherein a springback rate of a composition layer containing the negative electrode material for a lithium ion secondary battery is from 2.0% to 4.0%.
11 . A negative electrode for a lithium ion secondary battery, the negative electrode comprising:
a current collector; and
a negative electrode material layer containing the negative electrode material for a lithium ion secondary battery according to claim 2 , disposed on the current collector.
12 . A negative electrode for a lithium ion secondary battery, the negative electrode comprising:
a current collector; and
a negative electrode material layer containing the negative electrode material for a lithium ion secondary battery according to claim 3 , disposed on the current collector.
13 . A negative electrode for a lithium ion secondary battery, the negative electrode comprising:
a current collector; and
a negative electrode material layer containing the negative electrode material for a lithium ion secondary battery according to claim 4 , disposed on the current collector.
14 . A negative electrode for a lithium ion secondary battery, the negative electrode comprising:
a current collector; and
a negative electrode material layer containing the negative electrode material for a lithium ion secondary battery according to claim 7 , disposed on the current collector.
15 . A negative electrode for a lithium ion secondary battery, the negative electrode comprising:
a current collector; and
a negative electrode material layer containing the negative electrode material for a lithium ion secondary battery according to claim 8 , disposed on the current collector.
16 . A negative electrode for a lithium ion secondary battery, the negative electrode comprising:
a current collector; and
a negative electrode material layer containing the negative electrode material for a lithium ion secondary battery according to claim 9 , disposed on the current collector.
17 . A negative electrode for a lithium ion secondary battery, the negative electrode comprising:
a current collector; and
a negative electrode material layer containing the negative electrode material for a lithium ion secondary battery according to claim 10 , disposed on the current collector.