Negative electrode for power storage device, method for forming the same, and power storage device

Patent metadata

Field	Value
Publication number	US-2016315309-A1
Application number	US-201615200015-A
Country	US
Kind code	A1
Filing date	Jul 1, 2016
Priority date	Apr 6, 2012
Publication date	Oct 27, 2016
Grant date	—

Abstract

An object is to suppress electrochemical decomposition of an electrolyte solution and the like at a negative electrode in a lithium ion battery or a lithium ion capacitor; thus, irreversible capacity is reduced, cycle performance is improved, or operating temperature range is extended. A negative electrode for a power storage device including a negative electrode current collector, a negative electrode active material layer which is over the negative electrode current collector and includes a plurality of particles of a negative electrode active material, and a film covering part of the negative electrode active material. The film has an insulating property and lithium ion conductivity.

First claim

What is claimed is:

1 . A method for forming a battery, comprising the steps of:
forming a dispersion solution by dispersing a particle of an active material in a solution including one of metal alkoxide and silicon alkoxide, a stabilizing agent, and a solvent; attaching a gel, formed by hydrolyzing and condensing the one of metal alkoxide and silicon alkoxide in the dispersion solution, on a surface of the particle of the active material; and forming an oxide film on the surface by performing heating treatment on the gel.

2 . The method for forming a battery according to claim 1 , wherein the active material comprises a graphite.

3 . The method for forming a battery according to claim 1 , wherein the oxide film comprises Nb 2 O 5 .

4 . The method for forming a battery according to claim 1 , wherein the oxide film comprises silicon oxide.

5 . The method for forming a battery according to claim 1 , further comprising the steps of:
applying a slurry including the particle of the active material provided with the oxide film and a binder over a current collector; and baking the slurry.

6 . The method for forming a battery according to claim 1 , wherein the heating treatment is performed at more than or equal to 300° C. and less than or equal to 900° C.

7 . A power storage device comprising a battery formed by the method according to claim 1 .

Assignees

• Semiconductor Energy Lab

Inventors

• Inoue Nobuhiro
• Kataniwa Sachiko
• Kuriki Kazutaka
• Momo Junpei

Classifications

• H01M4/623

  fluorinated polymers · CPC title

• Y02E60/13

  Energy storage using capacitors · CPC title

• H01G11/28 Primary

  arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives · CPC title

• H01G11/50

  specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation · CPC title

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title