US 10,374,219 B2Granted

Lithium ion secondary battery

AssigneeNEC Corporation

InventorsRyuichi Kasahara, Jiro Iriyama, Shin Serizawa, Hiroo Takahashi, Tatsuji Numata

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Abstract

The object of an exemplary embodiment of the invention is to provide a lithium ion secondary battery having an excellent charge and discharge cycle property. An exemplary embodiment of the invention is a lithium ion secondary battery, comprising a battery assembly in which a positive electrode and a negative electrode are stacked through a separator and a package in which the battery assembly and an electrolyte are placed; wherein the negative electrode comprises a negative electrode collector which is composed of a metal and a negative electrode active material layer which is formed on the negative electrode collector and which comprises a negative electrode active material and a binder; wherein the negative electrode collector and the negative electrode active material layer have a crack which is formed so as to be communicated with each of them; and wherein the crack reaches an outer peripheral edge from an inside of the negative electrode.

Claims10

Dependent claims

A lithium ion secondary battery, comprising a battery assembly in which a positive electrode and a negative electrode are placed oppositely through a separator and a package which accommodates the battery assembly and an electrolyte;

wherein the negative electrode comprises a negative electrode collector, which is composed of a metal, and a negative electrode active material layer which comprises a negative electrode active material and a binder and which is formed on the negative electrode collector;
wherein the negative electrode collector has a first crack and the negative electrode active material layer has a second crack, and the first and second cracks form a slit;
wherein the slit reaches an outer peripheral edge from an inside of the negative electrode;
wherein the negative electrode active material comprises at least a particle comprising simple substance silicon, wherein the weight ratio of the simple substance silicon in the negative electrode active material layer is 5% or more and less than 50%;
and
wherein the slit is formed by cutting both the negative electrode collector and the negative electrode active material layer.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/119,201Filed 13 Apr 2012
Priority: JP 2011-13037310 Jun 2011
Published: US 2014/0127557 A18 May 2014
Granted: 6 Aug 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

H01M 4/13
Electrodes composed of, or comprising, active material: electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators;…
H01M 4/0404
Methods of deposition of the material: by coating on electrode collectors
H01M 4/134
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…
H01M 4/1395
Processes of manufacture: of electrodes based on metals, Si or alloys

Family

US 2014/0127557 A1Pre-grant publication · published 8 May 2014
US 10,374,219 B2This patent

From the US filing history. Foreign family members aren’t listed.

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