Negative Electrode Active Material for Electric Device and Electric Device Using the Same

Patent metadata

Field	Value
Publication number	US-2018013141-A1
Application number	US-201415537170-A
Country	US
Kind code	A1
Filing date	Dec 17, 2014
Priority date	Dec 17, 2014
Publication date	Jan 11, 2018
Grant date	—

Abstract

A negative electrode active material including a silicon-containing alloy having a predetermined composition is used in an electric device. A ratio value (B/A) of a diffraction peak intensity B of a (001) plane of Sn to a diffraction peak intensity A of a (111) plane of Si is 0.3 or more and 3.7 or less in an X-ray diffraction measurement of the silicon-containing alloy using a CuKα1 ray. Here, the diffraction peak of the (111) plane of Si is present in a range of 2θ=24 to 33° and the diffraction peak of the (001) plane of Sn is present in a range of 2θ=26 to 35°.

First claim

1 . A negative electrode active material for lithium ion secondary battery comprising a silicon-containing alloy having a composition represented by the following Chemical Formula (1)
[Chemical Formula 1] Si x Sn y M z A a   (1)
(in Chemical Formula (1) above, A is an unavoidable impurity, M is one or two or more elements selected from the group consisting of a transition metal, aluminum (Al), zinc (Zn), and carbon (C) and comprises one or two or more transition metal elements, x, y, z, and a represent values in terms of percent by mass, and 0<x<100, 0<y<100, 7<z<100, and 0≦a<0.5 and x+y+z+a=100), wherein a ratio value (B/A) of a diffraction peak intensity B of a (001) plane of Sn in a range of 2θ=26 to 35° to a diffraction peak intensity A of a (111) plane of Si in a range of 2θ=24 to 33° is 0.3 or more and 3.7 or less in an X-ray diffraction measurement of the silicon-containing alloy using a CuKα1 ray, and the silicon-containing alloy has a structure comprising a parent phase containing amorphous or low crystalline silicon as a main component and a silicide phase containing a silicide of a transition metal, wherein tin (Sn) is dispersed in silicon (Si) of the parent phase.

2 . The negative electrode active material for lithium ion secondary battery according to claim 1 , wherein B/A is 0.4 or more and 2.7 or less.

3 . The negative electrode active material for lithium ion secondary battery according to claim 2 , wherein B/A is 0.9 or more and 2.7 or less.

4 . The negative electrode active material for lithium ion secondary battery according to claim 3 , wherein B/A is 0.9 or more and 2.2 or less.

5 . The negative electrode active material for lithium ion secondary battery according to claim 1 , wherein a full width at half maximum of a diffraction peak of a (001) plane of Sn in a range of 2θ=26 to 35° is 0.6° or greater in an X-ray diffraction measurement of the silicon-containing alloy using a CuKα1 ray.

6 . The negative electrode active material for lithium ion secondary battery according to claim 1 , wherein M in Chemical Formula (1) above is titanium (Ti).

7 . (canceled)

8 . A negative electrode for lithium ion secondary battery comprising the negative electrode active material for lithium ion secondary battery set forth in claim 1 .

9 . A lithium ion secondary battery comprising the negative electrode for lithium ion secondary battery set forth in claim 8 .

Assignees

• Nissan Motor

Inventors

• Yoshioka Youichi
• Chiba Nobutaka
• Watanabe Manabu
• Miki Humihiro
• Kaburagi Tomohiro

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/386 Primary

  Silicon or alloys based on silicon · CPC title

• B22F9/002

  amorphous or microcrystalline · CPC title

• H01M10/052

  Li-accumulators · CPC title

• C22C29/18

  based on silicides · CPC title