# US 6,294,291 B1 · Secondary battery or cell with a non-aqueous electrolyte

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- Number: US 6,294,291 B1
- Document ID: US6294291B1
- Status: Granted
- Kind: B1
- Application number: 07/863,043
- Filed: 1992-04-03
- Granted: 2001-09-25
- Earliest claimed: 1991-01-17
- Assignees: Matsushita Electric Industrial Co., Ltd.
- Inventors: Yoshiyuki Ozaki; Nobuo Eda; Akiyoshi Morita
- Web page: https://patentgrep.com/patent/US6294291B1

## CPC

- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 4/587: for inserting or intercalating light metals
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- 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 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- 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
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A secondary battery with non-aqueous electrolyte having a high voltage and energy density and a superior cycle property, characterized in that a cathode comprises composite oxides containing lithium and an anode comprises composite carbon materials containing graphite spherical particles and carbon fibers. The carbon fiber improves the stiffness of the anode depolarizing mix to prevent the body made thereof from swelling and decomposing.

## Claims

### Claim 1

A secondary battery or cell with a non-aqueous electrolyte comprising:
a cathode containing composite oxides including lithium;
a non-aqueous electrolyte; and
an anode capable of being recharged repeatedly, said anode being a composite carbon material containing carbon fibers and graphite spherical particles, wherein said graphite spherical particles are mesocarbon microbeads.

### Claim 2 (depends on 1)

The secondary battery or cell with a non-aqueous electrolyte according to claim 1, wherein said mesocarbon microbeads have a lameller structure and a lattice spacing (d002) of 3.36 to 3.42 Å, measured by a wide angle X-ray diffraction method.

### Claim 3 (depends on 1)

The secondary battery or cell with a non-aqueous electrolyte according to claim 1, wherein the carbon fiber content among the carbon material is from 5 wt. % to 20 wt. %.

### Claim 4 (depends on 1)

The secondary battery or cell with a non-aqueous electrolyte according to claim 1, wherein the carbon fiber is selected from the group consisting of a vapor grown carbon fiber, a pitch carbon fiber and a PAN carbon fiber.