# US 7,407,727 B2 · Electrode used for a non-aqueous electrolyte secondary battery and a non-aqueous electrolyte secondary battery used the same for a negative electrode

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- Number: US 7,407,727 B2
- Document ID: US7407727B2
- Status: Granted
- Kind: B2
- Application number: 10/671,460
- Filed: 2003-09-29
- Published: 2005-04-07
- Granted: 2008-08-05
- Earliest claimed: 2002-09-30
- Assignees: Hitachi Maxell, Ltd.
- Inventors: Hiromu Sugiyama; Hideyuki Morimoto; Atsushi Ueda; Shigeo Aoyama
- Web page: https://patentgrep.com/patent/US7407727B2

## CPC

- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 4/75: Wires, rods or strips
- H01M 10/052: Li-accumulators
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

An electrode according to the invention can provide a non-aqueous electrolyte secondary battery having an ability to release a volume expansion at the time of charge and discharge as well as the time of a cycle. The electrode comprises a current collector made of a material which is not alloyed with Li, and a dot pattern 2 of a metallic material able to be alloyed with Li formed on the current collector. At the time of charge, since the volume expansion of each dot 3 is carried out so as to bury adjoining crevices 4 between the dots, a stress generated is released, thereby degradation of an electrode being avoided. Each dot may also be made into porosity.

## Claims

### Claim 1

An electrode used for a non-aqueous electrolyte secondary battery, which comprises a current collector of a metallic material not to be alloyed with Li and a pattern of dots formed on the current collector, which is an active material of a metallic material able to be alloyed with Li,
wherein the diameter of each dot is 1-500 micrometers,
the shape of the dots is a cylindrical column or a cone,
the dots are regularly arranged and also are completely separated from each other and project outward from the current collector,
the metallic material able to be alloyed with Li is at least one element selected from the group consisting of elements of group 14 and alloy thereof, and
the occupancy rate of the dots on the current collector is 50-90%.

### Claim 2 (depends on 1)

The electrode according to claim 1, wherein the height of said dot is 1-15 micrometers.

### Claim 3 (depends on 1)

The electrode according to claim 1, wherein the metallic material able to be alloyed with Li is an alloy comprising a) at least one element selected from the group consisting of Bi, Cu, Fe, Ni, Zn, and Ag and b) at least one element selected from the group consisting of elements of group 14.

### Claim 4 (depends on 1)

The electrode according to claim 1, wherein the interval of each dot is 5 micrometers or more.

### Claim 5 (depends on 1)

The electrode according to claim 1, wherein the dot pattern of the metallic material able to be alloyed with Li is formed on a current collector having a pattern of concave or convex.

### Claim 6 (depends on 1)

The electrode according to claim 1, wherein each of the dots is porous.

### Claim 7

A non-aqueous electrolyte secondary battery which comprises positive and negative electrodes, the negative electrode comprising a current collector of a metallic material not to be alloyed with Li and a pattern of dots formed on the current collector, which is an active material of a metallic material able to be alloyed with Li,
wherein the diameter of each dot is 1-500 micrometers,
the shape of the dots is a cylindrical column or a cone,
the dots are regularly arranged and also are completely separated from each other and project outward from the current collector,
the metallic material able to be alloyed with Li is at least one element selected from the group consisting of elements of group 14 and alloy thereof, and
the occupancy rate of the dots on the current collector is 50-90%.

### Claim 8 (depends on 7)

The non-aqueous electrolyte secondary battery according to claim 7, wherein the height of said dot in the negative electrode is 1-15 micrometers.

### Claim 9 (depends on 7)

The non-aqueous electrolyte secondary battery according to claim 7, wherein the metallic material able to be alloyed with Li is an alloy comprising a) at least one element selected from the group consisting of Bi, Cu, Fe, Ni, Zn, and Ag and b) at least one element selected from the group consisting of elements of group 14.

### Claim 10 (depends on 2)

The non-aqueous electrolyte secondary battery according to claim 2, wherein the interval of each dot is 5 micrometers or more.

### Claim 11 (depends on 7)

The non-aqueous electrolyte secondary battery according to claim 7, wherein the dot pattern of the metallic material able to be alloyed with Li is formed on a current collector having a pattern of concave or convex.

### Claim 12 (depends on 7)

The non-aqueous electrolyte secondary battery according to claim 7, wherein each of the dots is porous.