US 2004/0170898 A1Published application

Nonaqueous electrolyte battery

AssigneeSony Corporation

InventorsMashio Shibuya, Kenichi Kawase, Fumiko Hara, Yusuke Fujishige

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Abstract

The present invention uses the mixture of spherical carbonaceous materials having different average particle sizes as an anode active material in an anode composite mixture layer of an anode. The spherical carbonaceous material of large particle size decreases a reaction with non-aqueous electrolyte solution to suppress the decrease of a battery capacity, form clearances having suitable sizes in the anode composite mixture layer, and retain the non-aqueous electrolyte solution. The clearances in the anode composite mixture layer are efficiently filled with the carbonaceous material of small particle size while spaces capable of suitably retaining the non-aqueous electrolyte solution are left. Thus, the volume density of the anode composite mixture layer is improved and the battery capacity is increased. Accordingly, energy density can be increased without deteriorating battery characteristics.

Claims6

Dependent claims

A non-aqueous electrolyte battery comprising:

a cathode having a cathode active material containing lithium;
an anode having an anode active material capable of being doped with/dedoped from lithium;
and
a non-aqueous electrolyte including electrolyte salt, wherein the anode active material is composed of a mixture of a plurality of kinds of carbonaceous materials having different average particle sizes, and when the plurality of kinds of carbonaceous materials are arranged in order of small particle size, assuming that the particle size in the order of 10% from the side of a small particle size is D10, the particle size in the order of 50% from the side of a small particle size is D50, and the particle size in the order of 90% from the side of a small particle size is D90, the anode active material has a particle size distribution satisfying relations represented by following expressions (1) and (2).
log(D50)−log(D10)≦0.3 (1)
(The unit of D is μm and logarithms are respectively common logarithms having their bases of 10.)
log(D90)−log(D50)≦0.3 (2)
(The unit of D is μm and logarithms are respectively common logarithms having their bases of 10.)

5 more elements

A non-aqueous electrolyte battery comprising:

a cathode having a cathode active material containing lithium;
an anode having an anode active material capable of being doped with/dedoped from lithium;
and
a non-aqueous electrolyte including electrolyte salt, wherein the anode active material is composed of a mixture at least including graphite of large particle size whose average particle size is located within a range of 20 μm or larger and 40 μm or smaller and graphite of small particle size whose average particle size is located within a range of 5 μm or larger and 16 μm or smaller, and the average particle size of the graphite of small particle size is 0.55 times or smaller as small as the average particle size of the graphite of large particle size.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 10/474,941Filed 8 Apr 2004
Priority: JP 2002-5021626 Feb 2002
Published: 2 Sep 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification19 codes

H01M 4/587
Carbonaceous material, e.g. graphite-intercalation compounds or CFx: for inserting or intercalating light metals
H01M 4/133
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…
H01M 4/364
Composites: as mixtures
H01M 50/179
Adapted for the shape of the cells: for cells having curved cross-section, e.g. round or elliptic