# US 7,611,804 B2 · Nonaqueous secondary battery and electronic equipment using the same

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- Number: US 7,611,804 B2
- Document ID: US7611804B2
- Status: Granted
- Kind: B2
- Application number: 11/092,652
- Filed: 2005-03-30
- Published: 2005-10-06
- Granted: 2009-11-03
- Earliest claimed: 2004-03-31
- Assignees: Hitachi Maxell, Ltd.
- Inventors: Hideo Sakata; Hayato Higuchi; Fusaji Kita
- Web page: https://patentgrep.com/patent/US7611804B2

## CPC

- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- H01M 6/10: with wound or folded electrodes
- H01M 6/166: {by the solute}
- H01M 10/0565: Polymeric materials, e.g. gel-type or solid-type
- H01M 10/0567: characterised by the additives
- H01M 10/0568: characterised by the solutes
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2300/004: Three solvents
- 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

A nonaqueous secondary battery comprising an electrode body which comprises a positive electrode and a negative electrode laminated with a separator interposed between them, and a nonaqueous electrolyte, wherein said negative electrode comprises graphite as a negative electrode active material, and has a coating density of at least 1.70 g/cm3, pore diameter of the maximum of less than 0.5 μm, and the logarithmic value of differential intrusion of at least 0.14 cm3/g at the pore diameter of the maximum.

## Claims

### Claim 1

A nonaqueous secondary battery comprising an electrode body which comprises a positive electrode, a negative electrode, a separator laminated between the positive and negative electrodes, and a nonaqueous electrolyte,
wherein said negative electrode contains graphite as a negative electrode active material, has a dried and pressed coating density of at least 1.70 g/cm3, a pore diameter of the maximum of less than 0.5 μm, and a logarithmic value of differential intrusion of at least 0.14 cm3/g at the pore diameter of the maximum.

### Claim 2 (depends on 1)

The nonaqueous secondary battery according to the claim 1, wherein the active material of the negative electrode comprises a solvent and at least one metal salt comprising carbon which is soluble in the solvent.

### Claim 3 (depends on 2)

The nonaqueous secondary battery according to the claim 2, wherein the metal salt comprising carbon has a solubility of at least 0.5 mol/L in the solvent.

### Claim 4 (depends on 2)

The nonaqueous secondary battery according to The claim 2, wherein The metal salt comprising carbon is an organolithium salt.

### Claim 5 (depends on 4)

The nonaqueous secondary battery according to the claim 4, wherein the organolithium salt is at least one selected from the group consisting of LiCF3CO2, Li2C2F4(SO3)2, LiN(RfSO2)(Rf′SO2), LiN(RfOSO2)(Rf′OSO2), LiC(RfO2)3, LiCnF2n+1SO3 (n≧1), LiN(RfOSO2)2, and polymer imide lithium salt,
wherein Rf and Rf′ are each a fluoroalkyl group having 1 to 18 carbon atoms, and wherein n≧1.

### Claim 6 (depends on 2)

The nonaqueous secondary battery according to the claim 2, wherein the solvent comprises an ester, carbonate or mixtures thereof.

### Claim 7 (depends on 1)

The nonaqueous secondary battery according to the claim 1, wherein the active material of the negative electrode comprises electrically inert particles having an average particle diameter of 2 μm or less.

### Claim 8 (depends on 7)

The nonaqueous secondary battery according to the claim 7, wherein the electrically inert particles are a metal salt, a metal oxide or mixtures thereof.

### Claim 9 (depends on 7)

The nonaqueous secondary battery according to the claim 7, wherein the nonaqueous electrolyte in active material of the negative electrode comprises at least one metal salt comprising carbon which is soluble in the solvent,
wherein the total content of the soluble metal salt comprising carbon and the electrically inert particles is 2 wt % or less based on the total weight of the active material in the negative electrode.

### Claim 10 (depends on 1)

The nonaqueous secondary battery according to the claim 1, wherein the dried and pressed coating density is at least 1.75 g/cm3, and the logarithmic value of differential intrusion is at least 0.17 cm3/g at the pore diameter of the maximum.

### Claim 11 (depends on 1)

The nonaqueous secondary battery according to the claim 1, wherein the specific surface area of the graphite is at least 0.5 m2/g.

### Claim 12 (depends on 1)

The nonaqueous secondary battery according to the claim 1, wherein the graphite comprises a combination of primary particles having an average particle diameter of 5 μm or less and secondary particles having an average particle diameter of at least 10 μm.

### Claim 13 (depends on 1)

An electronic device comprising the nonaqueous secondary cell of claim 1.