Anode and battery

Patent metadata

Field	Value
Publication number	US-2016365610-A1
Application number	US-201615244824-A
Country	US
Kind code	A1
Filing date	Aug 23, 2016
Priority date	Oct 15, 2007
Publication date	Dec 15, 2016
Grant date	—

Abstract

A battery including a cathode, an anode, and an electrolytic solution. The electrolytic solution is impregnated in a separator provided between the cathode and the anode. The anode has an insulative coat on an anode active material layer provided on an anode current collector. The coat contains an insulating material such as a meal hydroxide and a metal oxide. The coat is in a form of plate divided into a plurality of portions. The insulation property of the coat prevents internal short circuit. A plurality of portions of the coat prevent separation of the anode active material layer and decomposition of the electrolytic solution. Further, even when short circuit occurs, heat generation is prevented by heat absorption characteristics of the coat.

First claim

What is claimed is:

1 . An anode comprising:
an anode current collector; an active material layer on the anode current collector; and an insulative coat on a first surface of the anode active material layer facing away from the current collector, wherein the insulative coat exposes sidewalls and a second surface of the anode active material layer, the second surface facing the anode current collector, wherein,
the insulative coat comprises a plurality of spaced apart portions across the first surface,
the anode active material layer contains a plurality of anode active material particles, and
the insulative coat comprises a material having a specific heat at 300° Kelvin of 1.7 J/K·g or more.

2 . The anode according to claim 1 , wherein the insulative coat is in the form of a plate.

3 . The anode according to claim 1 , wherein the plurality of anode active material particles contain silicon.

4 . The anode according to claim 1 , wherein where an area of the anode active material layer is S1 and an area of the insulative coat is S2, and an area ratio S2/S 1 is in a range from 0.2 to 0.9, inclusive.

5 . The anode according to claim 1 , wherein a weight per unit area of the insulative coat is in a range from 0.02 mg/cm 2 to 1 mg/cm 2 , inclusive.

6 . The anode according to claim 1 , wherein the active material layer comprises a plurality of layers.

7 . The anode according to claim 1 , wherein the insulative coat extends along a surface of two or more of the anode active material particles.

8 . The anode according to claim 1 , wherein the insulative coat comprises at least one of a metal hydroxide or a metal oxide.

9 . A battery comprising:
a cathode; an anode comprising (a) an anode current collector, (b) an active material layer on the anode current collector, and (c) an insulative coat on a first surface of the anode active material layer facing away from the current collector, wherein the insulative coat exposes sidewalls and a second surface of the anode active material layer, the second surface facing the anode current collector; and an electrolytic solution, wherein,
the insulative coat comprises a plurality of spaced apart portions across the first surface,
the anode active material layer contains a plurality of anode active material particles, and
the insulative coat comprises a material having a specific heat at 300° Kelvin of 1.7 J/K·g or more.

10 . The battery according to claim 9 , wherein the insulative coat is in the form of a plate.

11 . The battery according to claim 9 , wherein the plurality of anode active material particles contain silicon.

12 . The battery according to claim 9 , wherein where an area of the anode active material layer is S 1 and an area of the coat is S2, and an area ratio S2/S 1 is in a range from 0.2 to 0.9, inclusive.

13 . The battery according to claim 9 , wherein a weight per unit area of the coat is in a range from 0.02 mg/cm 2 to 1 mg/cm 2 , inclusive.

14 . The battery according to claim 9 , wherein the active material layer comprises a plurality of layers.

15 . The battery according to claim 9 , where the active material layer comprises a plurality of layers.

16 . The battery according to claim 9 , wherein the insulative coat extends along a surface of two or more of the anode active material particles.

17 . The battery according to claim 9 , wherein the insulative coat extends along a surface of two or more of the anode active material particles.

18 . The battery according to claim 9 , wherein the insulative coat comprises at least one of a metal hydroxide or a metal oxide.

19 . The battery according to claim 9 , wherein the insulative coat comprises at least one of a metal hydroxide or a metal oxide.

20 . The battery according to claim 9 , wherein the insulative coat is at least one selected from the group consisting of aluminum hydroxide, zirconium hydroxide, and titanium hydroxide, aluminum oxide, zirconium oxide, or titanium oxide.

21 . The battery according to claim 9 , wherein the active material layer comprises a carbon material.

Assignees

• Sony Corp

Inventors

• Fujii Takayuki
• Kawase Kenichi
• Nakai Hideki
• Imoto Rikako
• Yamamoto Kensuke

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M2220/00

  Batteries for particular applications · CPC title

• H01M10/4235 Primary

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title