Power storage device, method for manufacturing power storage device, and electronic device

Patent metadata

Field	Value
Publication number	US-2024258575-A1
Application number	US-202418613703-A
Country	US
Kind code	A1
Filing date	Mar 22, 2024
Priority date	Dec 10, 2015
Publication date	Aug 1, 2024
Grant date	—

Abstract

To provide a power storage device whose charge and discharge characteristics are unlikely to be degraded by heat treatment. To provide a power storage device that is highly safe against heat treatment. The power storage device includes a positive electrode, a negative electrode, a separator, an electrolytic solution, and an exterior body. The separator is located between the positive electrode and the negative electrode. The separator contains polyphenylene sulfide or solvent-spun regenerated cellulosic fiber. The electrolytic solution contains a solute and two or more kinds of solvents. The solute contains LiBETA. One of the solvents is propylene carbonate.

First claim

What is claimed is:

1 . A power storage device comprising:
a positive electrode; a negative electrode; a separator; an electrolytic solution; and an exterior body, wherein the exterior body comprises a plurality of projections and a plurality of depressions formed at regular intervals in a long axis direction of the power storage device, wherein one of the plurality of projections and one of the plurality of depressions are formed so as to extend in a short axis direction of the power storage device, wherein the positive electrode comprises a positive electrode active material layer and a positive electrode current collector, wherein the negative electrode comprises a negative electrode active material layer and a negative electrode current collector, wherein the separator is located between the positive electrode and the negative electrode, wherein the separator comprises polyphenylene sulfide or solvent-spun regenerated cellulosic fiber, wherein the electrolytic solution comprises a solute and two or more kinds of solvents, and further comprises propane sultone as an additive, wherein the solute comprises lithium bis(pentafluoroethanesulfonyl)amide, and wherein the solvents comprise propylene carbonate and ethylene carbonate.

2 . The power storage device according to claim 1 , wherein the negative electrode active material layer comprises graphite.

3 . The power storage device according to claim 2 ,
wherein the negative electrode active material layer comprises spherical natural graphite, wherein the spherical natural graphite comprises a first region and a second region, wherein the first region covers the second region, and wherein the first region has lower crystallinity than the second region.

4 . The power storage device according to claim 1 , wherein the positive electrode active material layer comprises LiCoO 2 .

5 . The power storage device according to claim 1 , wherein the positive electrode current collector comprises aluminum or stainless steel.

6 . An electronic device comprising:
the power storage device according to claim 2 ; a band; a display panel; and a housing, wherein the power storage device comprises a positive electrode lead and a negative electrode lead, wherein the positive electrode lead is electrically connected to the positive electrode, wherein the negative electrode lead is electrically connected to the negative electrode, wherein the power storage device is buried in the band, wherein a part of the positive electrode lead and a part of the negative electrode lead protrude from the band, wherein the power storage device has flexibility, wherein the power storage device is electrically connected to the display panel, wherein the display panel is incorporated in the housing, wherein the band is connected to the housing, and wherein the band comprises a rubber material.

Assignees

• Semiconductor Energy Lab

Inventors

• Narita Kazuhei
• Tajima Ryota
• Oguni Teppei

Classifications

• H01M4/661

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M2300/0037

  Mixture of solvents · CPC title

• H01M10/0568

  characterised by the solutes · CPC title