US 7,118,831 B2 · Nonaqueous electrolyte cell

Abstract

An anode with a multi-layer structure including a first layer (21) having carbon as a main component, and a second layer (22) having lithium-ion conductivity and including a material as a main component thereof which can insert and extract lithium ions, or a multi-layer structure including a third layer (23) containing lithium in addition to the first layer and the second layer, and a lithium secondary battery including the same. The lithium secondary battery can be provided in which the battery capacity is substantially enhanced in the voltage range where the battery is actually used while maintaining the higher charge-discharge efficiency and the excellent cycle performance.

Claims8

Dependent claims

A lithium secondary battery comprising:

(i) a cathode including a lithium-containing composite oxide,
(ii) an anode having a multi-layer structure including a first layer (21) having carbon as a main component thereof, a second layer (22) having a lithium-ion conductivity and including a material as a main component thereof which can insert and extract lithium ions, and a third layer (23) which contains lithium and is not in direct contact with the first layer (21), and
(iii) a non-aqueous electrolyte composed of a mixed solvent including a first non-aqueous solvent having a specific dielectric constant of 30 or more and a viscosity of 1 cP or more and a second non-aqueous solvent having a specific dielectric constant of 10 or less and a viscosity below 1 cP in a volume ratio from 2:8 to 6:4, and dissolving therein a lithium salt in a range from 0.5 to 1.5 mol/liter.

Dependencies are inferred from the claim text.

Facts

Application

10/503,956Filed 9 Apr 2003

Priority

JP 2002-10792110 Apr 2002

Published

US 2005/0089757 A128 Apr 2005

Granted

10 Oct 2006

Term ends

Not estimatedThe source records don’t support an estimate.

Classification11 codes

H01M 4/13
Electrodes composed of, or comprising, active material: electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators;…
H01M 10/0525
Li-accumulators: rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
H01M 4/133
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…
H01M 4/134
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…

Nonaqueous electrolyte cell

Life of this patent

Nonaqueous electrolyte cell

Life of this patent

Abstract

Claims8