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

Patent metadata

Field	Value
Publication number	US-2019296346-A1
Application number	US-201816122150-A
Country	US
Kind code	A1
Filing date	Sep 5, 2018
Priority date	Mar 26, 2018
Publication date	Sep 26, 2019
Grant date	—

Abstract

According to one embodiment, an active material is provided. The active material includes particles of a monoclinic niobium titanium composite oxide. The particles include primary particles. The primary particles have an average aspect ratio of 5 or more.

First claim

What is claimed is:

1 . An active material comprising particles of a monoclinic niobium titanium composite oxide, which comprise primary particles having an average aspect ratio of 5 or more.

2 . The active material according to claim 1 , wherein an average length of major axes of the primary particles is from 2.0 μm to 50.0 μm.

3 . The active material according to claim 1 , wherein an average length of minor axes of the primary particles is from 0.4 μm to 10.0 μm.

4 . The active material according to claim 1 , wherein the monoclinic niobium titanium composite oxide is represented by a general formula Ti 1-x M1 x Nb 2-y M2 y O 7 :
in the general formula, 0≤x<1 and 0≤y<1 are set, each of the elements M1 and M2 is at least one selected from the group consisting of V, Ta, Fe, Bi, P, Cr, Mo, W, B, K, Na, Mg, Al, and Si, and the elements M1 and M2 are the same element or are elements different from each other.

5 . An active material composite material comprising:
the active material according to claim 1 ; and a carbon body covering at least a portion of surfaces of particles of the active material.

6 . The active material according to claim 1 , wherein the average aspect ratio is from 5 to 25.

7 . The active material according to claim 1 , wherein a size of a crystallite corresponding to a (020) plane is from 60 nm to 110 nm.

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

9 . An electrode comprising the active material composite material according to claim 5 .

10 . A secondary battery comprising:
the electrode according to claim 8 as a negative electrode; a positive electrode; and an electrolyte.

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

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

13 . The battery pack according to claim 11 , which includes plural of the secondary battery, wherein the plural of the secondary battery are electrically connected in series, in parallel, or in combination of series and parallel.

14 . A vehicle comprising the battery pack according to claim 11 .

15 . The vehicle according to claim 14 , which comprises a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

Assignees

• Toshiba Kk
• Toshiba Infrastructure Systems & Solutions Corp

Inventors

• Harada Yasuhiro
• Takami Norio
• Fukaya Taro
• Iwasaki Takuya

Classifications

• B60L53/80

  Exchanging energy storage elements, e.g. removable batteries · CPC title

• B60L50/66

  Arrangements of batteries · CPC title

• B60L50/64

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

• C01G33/006

  Compounds containing niobium, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title