Nonaqueous electrolyte battery and battery pack

Patent metadata

Field	Value
Publication number	US-2016190651-A1
Application number	US-201615065162-A
Country	US
Kind code	A1
Filing date	Mar 9, 2016
Priority date	Sep 18, 2013
Publication date	Jun 30, 2016
Grant date	—

Abstract

According to one embodiment, a nonaqueous electrolyte battery includes a positive electrode, a negative electrode and a nonaqueous electrolyte. The negative electrode contains a negative electrode active material having a Li insertion/extraction potential of 0.4 V (vs. Li/Li + ) or more. The nonaqueous electrolyte is a liquid at 20 degrees Celsius and 1 atom and contains a silicon compound having an isocyanate group or an isothiocyanate group.

First claim

What is claimed is:

1 . A nonaqueous electrolyte battery comprising:
a positive electrode; a negative electrode containing a negative electrode active material having a Li insertion/extraction potential of 0.4 V (vs. Li/Li + ) or more; and a nonaqueous electrolyte which is a liquid at 20 degrees Celsius and 1 atom, and contains a silicon compound having an isocyanate group or an isothiocyanate group.

2 . The nonaqueous electrolyte battery according to claim 1 , wherein a content of the silicon compound is 0.01 mass % to 5 mass % in the nonaqueous electrolyte.

3 . The nonaqueous electrolyte battery according to claim 1 , wherein the silicon compound has a trimethylsilyl group.

4 . The nonaqueous electrolyte battery according to claim 1 , wherein the silicon compound is trimethylsilyl isocyanate, trimethylsilyl isothiocyanate, (trimethylsilyl)methyl isocyanate or (trimethylsilyl)methyl isothiocyanate.

5 . The nonaqueous electrolyte battery according to claim 1 , wherein the Li insertion/extraction potential of the negative electrode active material is 1.0 V (vs. Li/Li + ) or more.

6 . The nonaqueous electrolyte battery according to claim 5 , wherein the negative electrode active material is titanium composite oxide or niobium composite oxide.

7 . The nonaqueous electrolyte battery according to claim 6 , wherein the titanium composite oxide is a cubic crystal system spinel-type titanium composite oxide expressed by a general formula Li 4+x Ti 5 O 12 (−1≦x≦3) or a monoclinic β type titanium composite oxide expressed by a general formula Li x TiO 2 (0≦x≦1).

8 . The nonaqueous electrolyte battery according to claim 6 , wherein the niobium composite oxide is a monoclinic system niobium composite oxide expressed by a general formula Li x M (1-y) Nb y Nb 2 O (7+δ) (in which M is at least one selected from a group consisting of Ti and Zr, and x, y and δ satisfy 0≦x≦6, 0≦y≦1 and −1≦δ≦1, respectively).

9 . A battery pack comprising a nonaqueous electrolyte battery according to claim 1 .

10 . The battery pack according to claim 9 , which comprises a plurality of the nonaqueous electrolyte batteries, and the batteries are electrically connected in series, in parallel or in combination thereof.

11 . The battery pack according to claim 9 , further comprising a protective circuit which can detect a voltage of the nonaqueous electrolyte battery.

Assignees

• Toshiba Kk

Inventors

• Inagaki Hiroki
• Takami Norio

Classifications

• H01M50/595

  Tapes · CPC title

• H01M4/48

  of inorganic oxides or hydroxides · CPC title

• H01M10/0525

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

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title