Negative electrode for lithium ion secondary battery and lithium ion secondary battery
A negative electrode for a lithium ion secondary battery includes: a negative electrode current collector ( 11 ); and a negative electrode active material for a lithium ion secondary battery, which is disposed on the negative electrode current collector and contains a carbon material and an aqueous binder. The carbon material is a graphite particle having a covering layer containing amorphous carbon by 5 wt % or less relative to a total weight of the carbon material.
1. A negative electrode for a lithium ion secondary battery, comprising:
a negative electrode current collector; and
a negative electrode active material for a lithium ion secondary battery, which is disposed on the negative electrode current collector and contains a carbon material, an aqueous binder, and a conductive agent,
wherein the carbon material is a graphite particle having a covering layer containing amorphous carbon by 5 wt % or less relative to a total weight of the carbon material;
wherein the graphite particle has an uneven and irregular surface;
wherein the negative electrode active material has from 4 wt % to 7 wt % of the aqueous binder relative to the total weight of the negative electrode active material; and
wherein is the only carbon particle in the carbon material is the graphite particle.
2. The negative electrode for a lithium ion secondary battery according to claim 1 , wherein the aqueous binder comprises at least one material selected from styrene butadiene rubber, carboxymethyl cellulose, and a mixture thereof.
3. The negative electrode for a lithium ion secondary battery according to claim 1 , wherein the graphite particle comprises a particle of natural graphite.
4. The negative electrode for a lithium ion secondary battery according to claim 1 , wherein the aqueous binder comprises at least one material selected from a group consisting of butadiene rubber (BR), chloroprene rubber (CR), isoprene rubber (IR), and acrylonitrile butadiene rubber (NBR).
5. The negative electrode for a lithium ion secondary battery according to claim 1 , wherein the aqueous binder comprises polyvinylidene fluoride (PVDF).
6. The negative electrode for a lithium ion secondary battery according to claim 1 , wherein the aqueous binder comprises at least one material selected from a group consisting of xanthan gum, guar gum, and pectin.
7. The negative electrode for a lithium ion secondary battery according to claim 1 , wherein the aqueous binder comprises polytetrafluoroethylene (PTFE) and/or polyvinyl fluoride (PVF).
8. The negative electrode for a lithium ion secondary battery according to claim 1 , wherein the aqueous binder comprises at least one conductive polymer selected from the group consisting of polyanilines, polythiophenes, polyacetylenes, and polypyrroles.
9. The negative electrode for a lithium ion secondary battery according to claim 1 , wherein the conductive agent is selected from the group consisting of carbon fiber, carbon black, activated carbon, mesoporous carbon, fullerenes, and carbon nanotube.
10. The negative electrode for a lithium ion secondary battery according to claim 1 , further comprising at least one additive selected from the group consisting of thickener, dispersant, and stabilizer.
11. The negative electrode for a lithium ion secondary battery according to claim 1 , wherein the graphite particle is in contact with an adjacent graphite particle at a plurality of points.
12. The negative electrode for a lithium ion secondary battery according to claim 1 , wherein the carbon material consists of the graphite particle.
13. A lithium ion secondary battery comprising a power generating element inside a package, the power generating element comprising:
a positive electrode;
the negative electrode according to claim 1 ;
a separator; and
an electrolyte solution.
14. A negative electrode for a lithium ion secondary battery, comprising:
a negative electrode current collector; and
a negative electrode active material for a lithium ion secondary battery, which is disposed on the negative electrode current collector and contains a carbon material, an aqueous binder, and a conductive agent,
wherein the carbon material is a graphite particle having a covering layer containing amorphous carbon by 5 wt % or less relative to a total weight of the carbon material;
wherein the graphite particle is in contact with an adjacent graphite particle at a plurality of points;
wherein the negative electrode active material has from 4 wt % to 7 wt % of the aqueous binder relative to the total weight of the negative electrode active material; and
wherein is the only carbon particle in the carbon material is the graphite particle.
15. The negative electrode for a lithium ion secondary battery according to claim 14 , wherein the aqueous binder comprises at least one material selected from styrene butadiene rubber, carboxymethyl cellulose, and a mixture thereof.
16. The negative electrode for a lithium ion secondary battery according to claim 14 , wherein the graphite particle comprises is a particle of natural graphite.
17. The negative electrode for a lithium ion secondary battery according to claim 14 , wherein the aqueous binder comprises at least one material selected from a group consisting of butadiene rubber (BR), chloroprene rubber (CR), isoprene rubber (IR), and acrylonitrile butadiene rubber (NBR).
18. The negative electrode for a lithium ion secondary battery according to claim 14 , wherein the carbon material consists of the graphite particle.
19. A lithium ion secondary battery comprising a power generating element inside a package, the power generating element comprising:
a positive electrode;
the negative electrode according to claim 14 ;
a separator; and
an electrolyte solution.
20. A negative electrode for a lithium ion secondary battery, comprising:
a negative electrode current collector; and
a negative electrode active material for a lithium ion secondary battery, which is disposed on the negative electrode current collector and contains a carbon material, an aqueous binder, and a conductive agent,
wherein the carbon material is a graphite particle having a covering layer containing amorphous carbon by 5 wt % or less relative to a total weight of the carbon material; and
wherein the graphite particle has an uneven and irregular shape;
wherein the negative electrode active material has from 4 wt % to 7 wt % of the aqueous binder relative to the total weight of the negative electrode active material; and
wherein is the only carbon particle in the carbon material is the graphite particle.
21. The negative electrode for a lithium ion secondary battery according to claim 20 , wherein the carbon material consists of the graphite particle.