Nonaqueous electrolyte secondary battery and battery pack

Patent metadata

Field	Value
Publication number	US-9825330-B2
Application number	US-201414167288-A
Country	US
Kind code	B2
Filing date	Jan 29, 2014
Priority date	Mar 15, 2012
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

A nonaqueous electrolyte secondary battery according to an embodiment includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The negative electrode contains a negative electrode active material. A lithium insertion-extraction reaction potential of a negative electrode active material is higher than the oxidation-reduction potential of lithium by a value of 1 V or more. The nonaqueous electrolyte contains an electrolytic salt, a nonaqueous solvent, at least one hydroxyalkylsulfonic acid, and at least one sulfonate.

First claim

The claims are as follows:

1. A nonaqueous electrolyte secondary battery, comprising:
a positive electrode;
a negative electrode comprising lithium titanium oxide; and
a nonaqueous electrolyte, the nonaqueous electrolyte consisting of:
a nonaqueous solvent,
an electrolyte,
0.01 to 18% by mass of at least one selected from the group consisting of hydroxymethanesulfonic acid, 2-hydroxyethanesulfonic acid, 3-hydroxypropanesulfonic acid, 4-hydroxybutanesulfonic acid, 5-hydroxypentanesulfonic acid, 3-hydroxypropenesulfonic acid, and 4-hydroxybutylenesulfonic acid, and
at least one sulfonate having a cyclic structure.

2. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the at least one sulfonate having a cyclic structure is selected from the group consisting of 1,2-ethanesultone, 1,3-propanesultone, 1,4-butanesultone, 1,5-pentanesultone, 1,3-propenesultone, and 1,4-butenesultone, and a content rate of the at least one sulfonate having a cyclic structure in the nonaqueous electrolyte is from 0.01 to 18% by mass.

3. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the negative electrode has, on a surface of the negative electrode, a coat comprising sulfur atoms on a surface of the negative electrode, and the coat has a thickness of 0.1 to 10 nm.

4. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the lithium titanium oxide is a spinel-type lithium titanate.

5. A battery pack comprising the nonaqueous electrolyte secondary battery according to claim 1 .

6. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the lithium titanium oxide is a ramsdellite-type lithium titanate.

7. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the lithium titanium oxide has an average primary particle size of 5 μm or less.

8. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the lithium titanium oxide has a specific surface area of 1 to 10 m 2 /g.

9. The nonaqueous electrolyte secondary battery according to claim 1 , wherein:
the concentration of the electrolyte in the nonaqueous electrolyte is 0.5 to 2 mol/L;
the content rate of the at least one selected from the group consisting of hydroxymethanesulfonic acid, 2-hydroxyethanesulfonic acid, 3-hydroxypropanesulfonic acid, 4-hydroxybutanesulfonic acid, 5-hydroxypentanesulfonic acid, 3-hydroxypropenesulfonic acid, and 4-hydroxybutylenesulfonic acid in the nonaqueous electrolyte is 0.01 to 10% by mass; and
the content rate of the at least one sulfonate having a cyclic structure in the nonaqueous electrolyte is 0.01 to 10% by mass.

10. The nonaqueous electrolyte secondary battery according to claim 9 , wherein:
the content rate of the at least one selected from the group consisting of hydroxymethanesulfonic acid, 2-hydroxyethanesulfonic acid, 3-hydroxypropanesulfonic acid, 4-hydroxybutanesulfonic acid, 5-hydroxypentanesulfonic acid, 3-hydroxypropenesulfonic acid, and 4-hydroxybutylenesulfonic acid in the nonaqueous electrolyte is 0.1 to 2% by mass; and
the content rate of the at least one sulfonate having a cyclic structure in the nonaqueous electrolyte is 0.1 to 2% by mass.

11. The nonaqueous electrolyte secondary battery according to claim 10 , wherein the lithium titanium oxide has an average primary particle size of 5 μm or less.

12. The nonaqueous electrolyte secondary battery according to claim 10 , wherein the lithium titanium oxide has a specific surface area of 1 to 10 m 2 /g.

13. The nonaqueous electrolyte secondary battery according to claim 1 , wherein:
the concentration of the electrolyte in the nonaqueous electrolyte is 0.5 to 2 mol/L;
the content rate of the at least one selected from the group consisting of hydroxymethanesulfonic acid, 2-hydroxyethanesulfonic acid, 3-hydroxypropanesulfonic acid, 4-hydroxybutanesulfonic acid, 5-hydroxypentanesulfonic acid, 3-hydroxypropenesulfonic acid, and 4-hydroxybutylenesulfonic acid in the nonaqueous electrolyte is 0.01 to15% by mass; and
the content rate of the at least one sulfonate having a cyclic structure in the nonaqueous electrolyte is 0.01 to 15% by mass.

14. The nonaqueous electrolyte secondary battery according to claim 1 , wherein:
the concentration of the electrolyte in the nonaqueous electrolyte is 0.5 to 2 mol/L;
the content rate of the at least one selected from the group consisting of hydroxymethanesulfonic acid, 2-hydroxyethanesulfonic acid, 3-hydroxypropanesulfonic acid, 4-hydroxybutanesulfonic acid, 5-hydroxypentanesulfonic acid, 3-hydroxy propenesulfonic acid, and 4-hydroxy butylenesulfonic acid in the nonaqueous electrolyte is 0.1 to 18% by mass; and
the content rate of the at least one sulfonate having a cyclic structure in the nonaqueous electrolyte is 0.1 to 18% by mass.

15. The nonaqueous electrolyte secondary battery according to claim 1 , wherein said at least one sulfonate having a cyclic structure has 2-5 carbon atoms.

Assignees

• Toshiba Kk

Inventors

• Kuriyama Hiromichi
• Saruwatari Hidesato
• Kuriyama Kazuya
• Matsuno Shinsuke

Classifications

• 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

• Y02T10/7011

  Cross-Sectional Technologies · mapped topic

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M4/366

  as layered products · CPC title