Active material, electrode, secondary battery, battery pack, and vehicle

Patent metadata

Field	Value
Publication number	US-2024105917-A1
Application number	US-202318174909-A
Country	US
Kind code	A1
Filing date	Feb 27, 2023
Priority date	Sep 15, 2022
Publication date	Mar 28, 2024
Grant date	—

Abstract

According to one embodiment, provided is an active material including a niobium titanium-containing oxide phase and a carbon coating layer. The niobium titanium-containing oxide phase contains a niobium titanium-containing oxide having a monoclinic structure and Na, and a Na content therein is 0 ppm or more and 100 ppm or less. The carbon coating layer coats at least a part of the niobium titanium-containing oxide phase, and contains 0.001% or more of carboxyl group.

First claim

What is claimed is:

1 . An active material comprising:
a niobium titanium-containing oxide phase that comprises a niobium titanium-containing oxide having a monoclinic structure and Na, a Na content in the niobium titanium-containing oxide phase being 0 ppm or more and 100 ppm or less; and a carbon coating layer that coats at least a part of the niobium titanium-containing oxide phase, the carbon coating layer containing 0.001% or more of carboxyl group.

2 . The active material according to claim 1 , wherein the niobium titanium-containing oxide phase contains a crystal structure of at least one phase selected from a group consisting of Nb 2 TiO 7 phase, Nb 10 Ti 2 O 29 phase, Nb 14 TiO 37 phase, and Nb 24 TiO 64 phase.

3 . The active material according to claim 2 , wherein the at least one phase contains at least one selected from a group consisting of K, Zr, Sn, V, Nb, Ta, Mo, W, Y, Fe, Co, Cr, Mn, Ni, and Al.

4 . The active material according to claim 1 , containing an active material particle having a BET specific surface area of 0.8 m 2 /g or greater and less than 50 m 2 /g.

5 . An electrode comprising the active material according to claim 1 .

6 . The electrode according to claim 5 , comprising an active material-containing layer, the active material-containing layer containing the active material and an electro-conductive agent that contains a fibrous carbon.

7 . A secondary battery comprising:
a positive electrode; a negative electrode; and an electrolyte, the negative electrode comprising the electrode according to claim 5 .

8 . The secondary battery according to claim 7 , wherein the positive electrode comprises a positive electrode active material, and the positive electrode active material comprises a lithium phosphate having an olivine structure.

9 . The secondary battery according to claim 7 , wherein the positive electrode comprises a positive electrode active material, and the positive electrode active material comprises at least one selected from a group consisting of lithium manganese composite oxide having a spinel structure, lithium cobalt composite oxide, lithium nickel cobalt composite oxide, lithium manganese cobalt composite oxide, and lithium nickel cobalt manganese composite oxide.

10 . A battery pack comprising the secondary battery according to claim 7 .

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

12 . The battery pack according to claim 10 , further comprising plural of the secondary battery, the secondary batteries being electrically connected in series, in parallel, or in a combination of in series and in parallel.

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

14 . The vehicle according to claim 13 , comprising a mechanism that converts kinetic energy of the vehicle into regenerative energy.

Assignees

• Toshiba Kk

Inventors

• Harada Yasuhiro
• Fukaya Taro
• Yamashita Yasunobu
• Ueda Kakuya
• Murata Yoshiaki
• Takami Norio

Classifications

• B60L3/0046

  relating to electric energy storage systems, e.g. batteries or capacitors · CPC title

• B60L2240/545

  Temperature · CPC title

• B60L58/18

  of two or more battery modules · CPC title

• B60L50/64

  Constructional details of batteries specially adapted for electric vehicles · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title