Active material and battery

Patent metadata

Field	Value
Publication number	US-2020020929-A1
Application number	US-201916504210-A
Country	US
Kind code	A1
Filing date	Jul 5, 2019
Priority date	Jul 13, 2018
Publication date	Jan 16, 2020
Grant date	—

Abstract

A main object of the present disclosure is to provide a novel active material whose volume variation due to charge/discharge is small. The present disclosure achieves the object by providing an active material having a composition represented by NaxMySi46, wherein M is a metal element other than Na, x and y satisfy 0<x, 0≤y, y≤x and 0<x+y<8, and comprising a crystal phase of a Type I silicon clathrate.

First claim

1 . An active material having a composition represented by Na x M y Si 46 , wherein M is a metal element other than Na, x and y satisfy 0<x, 0≤y, y≤x and 0<x+y<8, and
comprising a crystal phase of a Type I silicon clathrate.

2 . The active material according to claim 1 , wherein the active material comprises the crystal phase of the Type I silicon clathrate as a main phase.

3 . The active material according to claim 1 , wherein the crystal phase of the Type I silicon clathrate has a peak at a position of 2θ=30.33°±1.00°, 31.60°±1.00°, 32.82°±1.00°, 52.39°±1.00° and 55.49°±1.00° in X-ray diffraction measurement using a CuKα ray.

4 . The active material according to claim 1 , wherein the active material does not comprise a Si crystal phase of a diamond-type.

5 . The active material according to claim 3 , wherein the active material comprises a Si crystal phase of a diamond-type,
the Si crystal phase of the diamond-type has a peak at a position of 2θ=28.44°±1.00° in X-ray diffraction measurement using a CuKα ray, and when a diffraction intensity of the peak at 2θ=32.82°±1.00° is regarded as I A , and a diffraction intensity of the peak at 2θ=28.44°±1.00° is regarded as I B , I B /I A is more than 0, and 0.1 or less.

6 . The active material according to claim 1 , wherein the x and the y satisfy 2.9≤x, 2.9≤x+y≤7.1.

7 . A battery comprising a cathode layer, an electrolyte layer, and an anode layer, in this order, and
the anode layer includes the active material according to claim 1 .

8 . The battery according to claim 7 , wherein the electrolyte layer includes an inorganic solid electrolyte.

9 . The battery according to claim 7 , wherein the electrolyte layer includes a liquid electrolyte.

10 . The battery according to claim 7 , wherein the battery is a lithium ion battery.

11 . The battery according to claim 7 , wherein the battery is a sodium ion battery.

Assignees

• Toyota Motor Co Ltd

Inventors

• Yoshida Jun
• Kosaka Daichi
• Otomo Takamasa
• Waseda Tetsuya
• Nakano Hideyuki

Classifications

• H01M4/386 Primary

  Silicon or alloys based on silicon · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M10/0525

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

• H01M10/054

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title

• H01M10/0562

  Solid materials · CPC title