Secondary battery, composite electrolyte, battery pack, and vehicle

Patent metadata

Field	Value
Publication number	US-2017077547-A1
Application number	US-201615262275-A
Country	US
Kind code	A1
Filing date	Sep 12, 2016
Priority date	Sep 16, 2015
Publication date	Mar 16, 2017
Grant date	—

Abstract

According to one embodiment, a composite electrolyte includes lithium-containing oxide particles and an electrolytic composition. The electrolytic composition includes lithium ions, an organic solvent and a polymer. A content of the lithium-containing oxide particles in the composite electrolyte falls within a range of from 90% by weight to 98% by weight. A specific surface area of the lithium-containing oxide particles falls within a range of 10 m 2 /g to 500 m 2 /g and is measured by a BET adsorption method using N 2 .

First claim

What is claimed is:

1 . A secondary battery comprising:
a positive electrode active material-containing layer; a negative electrode active material-containing layer; and a composite electrolyte provided between the positive electrode active material-containing layer and the negative electrode active material-containing layer, wherein: the composite electrolyte comprises lithium-containing oxide particles and an electrolytic composition which comprises lithium ions, an organic solvent and a polymer, and a content of the lithium-containing oxide particles in the composite electrolyte falls within a range of from 90% by weight to 98% by weight and a specific surface area of the lithium-containing oxide particles falls within a range of 10 m 2 /g to 500 m 2 /g and is measured by a BET adsorption method using N 2 .

2 . The secondary battery according to claim 1 , wherein the organic solvent comprises carbonates.

3 . The secondary battery according to claim 2 , wherein the carbonates is at least one selected from a group consisting of propylene carbonate, ethylene carbonate, diethyl carbonate, and methylethyl carbonate.

4 . The secondary battery according to claim 1 , wherein the lithium-containing oxide particles include at least one selected from particles of a lithium ion conductive oxide solid electrolyte having a garnett type structure, and particles of a lithium phosphate solid electrolyte having NASICON type structure.

5 . The secondary battery according to claim 1 , wherein the negative electrode active material-containing layer contains a titanium-containing oxide.

6 . The secondary battery according to claim 5 , wherein the titanium-containing oxide comprises at least one selected from a group consisting of a lithium titanium oxide having a spinel structure, a monoclinic titanium oxide, and a niobium titanium oxide.

7 . The secondary battery according to claim 1 , further comprising a current collector having a first surface and a second surface positioned opposite to the first surface,
wherein the current collector has a bipolar structure in which the positive electrode active material-containing layer is formed on the first surface of the current collector and the negative electrode active material-containing layer is formed on the second surface.

8 . The secondary battery according to claim 1 , wherein the positive electrode active material-containing layer contains a positive electrode active material containing at least one selected from a phosphate compound having an olivine structure, and Li x Ni 1−y−x Co y Mn z O 2 where 0<x≦1, 0<y≦1, 0≦z≦1.

9 . The secondary battery according to claim 8 , wherein the phosphate compound having the olivine structure is represented by Li x Fe 1−y−z Mn y M z PO 4 ,
wherein: M is at least one element selected from the group consisting of Mg, Al, Ti, and Zr; and 0≦x≦1.1, 0≦y≦1, and 0≦z≦0.2 are set.

10 . A battery pack comprising the secondary battery according to claim 1 .

11 . The battery pack according to claim 10 further comprising:
an external power distribution terminal; and
a protective circuit.

12 . The battery pack comprising secondary batteries, each according to claim 1 ; and
the secondary batteries are electrically connected in series, in parallel, or in combination of series and parallel.

13 . A vehicle comprising the battery pack according to claim 10 .

14 . The vehicle according to claim 13 , wherein the battery pack is configured to recover a regenerative energy of a power of the vehicle.

15 . A composite electrolyte comprising:
lithium-containing oxide particles having a specific surface area, which is measured by a BET adsorption method using N 2 , of 10 m 2 /g to 500 m 2 /g, and a content of the lithium-containing oxide particles in the composite electrolyte falling within a range of from 90% by weight to 98% by weight; and an electrolytic composition comprising lithium ions, an organic solvent, and a polymer.

Assignees

• Toshiba Kk

Inventors

• Takami Norio
• Yoshima Kazuomi
• Harada Yasuhiro

Classifications

• H01M10/0565

  Polymeric materials, e.g. gel-type or solid-type · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/5815

  Sulfides · CPC title

• H01M10/0567

  characterised by the additives · CPC title