ANODE AND BATTERY

Abstract

An anode and a battery capable of improving conductivity in spite of reducing the ratio of a binder are provided. A cathode and an anode face each other with a separator and an electrolyte in between. The anode includes an anode current collector and an anode active material layer arranged on the anode current collector. The anode active material layer includes an anode active material, a binder and a member including at least one kind selected from the group consisting of nickel, iron and a nickel compound or an iron compound. The content of the binder in the anode active material layer is within a range from 0.5 wt % to 5.0 wt %, both inclusive.

Description

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an exploded perspective view of a secondary battery according to an embodiment.

FIG. 2 is a sectional view of a spirally wound electrode body taken along a line II-II of FIG. 1.

Claims

1. An anode comprising: an anode current collector and an anode active material layer arranged on the anode current collector,wherein the anode active material layer includes an anode active material, a binder and a member including at least one member selected from the group consisting of nickel, iron, a nickel compound and an iron compound, andthe content of the binder in the anode active material layer ranges from 0.5 wt % to 5.0 wt %, both inclusive.

2. The anode according to claim 1, wherein a purity of nickel or iron in the member is 90 wt % or more.

3. The anode according to claim 1, wherein the binder includes at least one material selected from the group consisting of polyvinylidene fluoride, styrene butadiene rubber and polyacrylonitrile.

4. The anode according to claim 1, wherein the member has a fibrous shape, and the fiber diameter is 5 μm or less, and the ratio of the fiber length to the fiber diameter (fiber length/fiber diameter) is 5 or more.

5. The anode according to claim 1, wherein the anode active material includes an anode material capable of inserting and extracting lithium.

6. A battery comprising: a cathode, an anode and an electrolyte,wherein the anode includes an anode current collector and an anode active material layer arranged on the anode current collector,the anode active material layer includes an anode active material, a binder and a member including at least one member selected from the group consisting of nickel, iron, a nickel compound and an iron compound, andthe content of the binder in the anode active material layer is ranges from 0.5 wt % to 5.0 wt %, both inclusive.

7. The battery according to claim 6, wherein a purity of nickel or iron in the material is 90 wt % or more.

8. The battery according to claim 6, wherein the binder includes at least one material selected from the group consisting of polyvinylidene fluoride, styrene butadiene rubber and polyacrylonitrile.

9. The battery according to claim 6, wherein the material has a fibrous shape, and the fiber diameter is 5 μm or less, and the ratio of the fiber length to the fiber diameter (fiber length/fiber diameter) is 5 or more.

10. The battery according to claim 6, wherein the anode active material includes a material capable of inserting and extracting lithium.

11. The battery according to claim 6, wherein the electrolyte includes an electrolytic solution and a polymer including vinylidene fluoride as a component.

12. The battery according to claim 6, wherein the electrolyte includes an electrolytic solution and a polymer having a structure in which at least one material selected from the group consisting of polyvinyl acetal and polymerized derivatives thereof.

13. The battery according to claim 6, wherein the cathode, the anode and the electrolyte are contained in a film-shaped package member.

14. The battery according to claim 6, wherein the open circuit voltage in a fully charged state per a pair of the cathode and the anode is ranges from 4.10 V to 6.00 V, both inclusive.