Active material and lithium ion battery

Patent metadata

Field	Value
Publication number	US-9634320-B2
Application number	US-201314763801-A
Country	US
Kind code	B2
Filing date	Dec 25, 2013
Priority date	Jan 30, 2013
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

An active material used for an electrochemical device utilizing Li ion conduction, and capable of improving cycle stability. The object is attained by providing an active material used for an electrochemical device utilizing Li ion conduction, including an active substance capable of absorbing and releasing a Li ion, and an Na ion conductor disposed on the surface of the active substance and having a polyanionic structure.

First claim

The invention claimed is:

1. An electrochemical device utilizing Li ion conduction, comprising
an active substance having an active material capable of absorbing and releasing a Li ion,
a nonaqueous liquid electrolyte, and
an Na ion conductor disposed on a surface of the active substance and having a polyanionic structure,
wherein the Na ion conductor is represented by a general formula:
Na 1−w Li w M 1 x M 2 2−x (AO y ) z

where:
(M 1 is at least one selected from the group consisting of Al, Fe, In, Cr, Sc, Ga, La, and Y;
M 2 is at least one selected from the group consisting of Ti, Zr, Ge, Sn, and Hf;
A is at least one selected from the group consisting of P, Si, Ti, V, W, and Nb; and
0≦x≦1,
0<y,
0<z, and
0≦w<1.

2. The electrochemical device according to claim 1 , wherein the Na ion conductor is provided with a nasicon-type crystal phase.

3. The electrochemical device according to claim 1 , wherein the electrochemical device is a lithium ion battery.

4. The electrochemical device according to claim 1 , wherein the active substance is a cathode active material.

5. The electrochemical device according to claim 1 , wherein A is at least one selected from the group consisting of P, Si, Ti, and V.

6. The electrochemical device according to claim 1 , wherein A is P.

7. The electrochemical device according to claim 1 , wherein M 1 is at least one selected from the group consisting of Al, Fe, and In.

8. The electrochemical device according to claim 1 , wherein M 1 is Al.

9. The electrochemical device according to claim 1 , wherein M 2 is at least one selected from the group consisting of Ti, Zr, and Ge.

10. The electrochemical device according to claim 1 , wherein M 2 is Ti.

11. The electrochemical device according to claim 1 , wherein M 1 is Al, and M 2 is Ti.

12. The electrochemical device according to claim 1 , wherein M 1 is Al, and M 2 is Zr.

13. The electrochemical device according to claim 1 , wherein 0≦x≦0.4.

14. The electrochemical device according to claim 1 , wherein M 2 is Ti, and A is P.

Assignees

• Nat Univ Corp Gunma Univ
• Toyota Motor Co Ltd

Inventors

• Morimoto Hideyuki
• Tobishima Shin-Ichi
• Shindo Yohei

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01G11/30

  characterised by their material · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M10/0525

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

• H01G11/06

  with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC] · CPC title