Composite material as electrode for sodium ion batteries, production method therefor, and all-solid-state sodium battery

Patent metadata

Field	Value
Publication number	US-2017005337-A1
Application number	US-201415039913-A
Country	US
Kind code	A1
Filing date	Dec 1, 2014
Priority date	Dec 9, 2013
Publication date	Jan 5, 2017
Grant date	—

Abstract

A composite material as an electrode for a sodium ion secondary battery includes an active material crystal, a sodium-ion conductive crystal, and an amorphous phase. The active material crystal may contain Na, M (where M represents at least one kind of transition metal element selected from Cr, Fe, Mn, Co, and Ni), P, and O.

First claim

1 . A composite material as an electrode for a sodium ion secondary battery, comprising:
an active material crystal; a sodium-ion conductive crystal; and an amorphous phase.

2 . The composite material as an electrode for a sodium ion secondary battery according to claim 1 , wherein the active material crystal contains: Na; M, where M represents at least one kind of transition metal element selected from Cr, Fe, Mn, Co, and Ni; P; and O.

3 . The composite material as an electrode for a sodium ion secondary battery according to claim 2 , wherein the active material crystal comprises a triclinic crystal belonging to a space group P1 or P-1.

4 . The composite material as an electrode for a sodium ion secondary battery according to claim 2 , wherein the active material crystal comprises a crystal represented by the general formula Na x M y P 2 O 7 , where x satisfies 1.20≦x≦2.80 and y satisfies 0.95≦y≦1.60.

5 . The composite material as an electrode for a sodium ion secondary battery according to claim 1 , wherein the active material crystal contains: at least one kind selected from Nb and Ti; and O.

6 . The composite material as an electrode for a sodium ion secondary battery according to claim 5 , wherein the active material crystal contains Na and/or Li.

7 . The composite material as an electrode for a sodium ion secondary battery according to claim 5 , wherein the active material crystal comprises an orthorhombic crystal, a hexagonal crystal, a cubic crystal, or a monoclinic crystal.

8 . The composite material as an electrode for a sodium ion secondary battery according to claim 5 , wherein the active material crystal comprises a monoclinic crystal belonging to a space group P2 1 /m.

9 . The composite material as an electrode for a sodium ion secondary battery according to claim 1 , wherein the active material crystal comprises a crystal of at least one kind of metal selected from Sn, Bi, and Sb.

10 . The composite material as an electrode for a sodium ion secondary battery according to claim 1 , wherein the sodium-ion conductive crystal contains: at least one kind selected from Al, Y, Zr, Si, and P; Na; and O.

11 . The composite material as an electrode for a sodium ion secondary battery according to claim 10 , wherein the sodium-ion conductive crystal comprises a monoclinic crystal, a hexagonal crystal, or a trigonal crystal.

12 . The composite material as an electrode for a sodium ion secondary battery according to claim 1 , wherein the amorphous phase contains: at least one kind selected from P, B, and Si; Na; and O.

13 . An all-solid-state sodium battery comprising a positive electrode that is constituted by the composite material as an electrode for a sodium ion secondary battery of claim 1 .

14 . An all-solid-state sodium battery comprising a negative electrode that is constituted by the composite material as an electrode for a sodium ion secondary battery of claim 1 .

15 . A method of producing the composite material as an electrode for a sodium ion secondary battery of claim 1 , the method comprising firing raw powder material containing crystallizable glass powder, to form the amorphous phase.

Assignees

• Nippon Electric Glass Co

Inventors

• IKEJIRI Junichi
• Yamauchi Hideo

Classifications

• C03C3/14

  containing boron · CPC title

• H01M10/054

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

• H01M4/5825 Primary

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title