Non-aqueous electrolyte secondary battery and battery pack

Patent metadata

Field	Value
Publication number	US-2016261004-A1
Application number	US-201414483354-A
Country	US
Kind code	A1
Filing date	Sep 11, 2014
Priority date	Sep 13, 2013
Publication date	Sep 8, 2016
Grant date	—

Abstract

A non-aqueous electrolyte secondary battery of an embodiment includes an exterior member, a negative electrode containing a titanium-containing oxide housed in the exterior member, a positive electrode housed in the exterior member, a separator housed in the exterior member and arranged between the positive electrode and the negative electrode, and a non-aqueous electrolyte solution housed in the exterior member. At least one type or more chain carbonates are contained in a solvent of the non-aqueous electrolyte solution. A self-diffusion coefficient of the chain carbonate in −20° C. is front 1.4×10 −10 to 2.0×10 −10 m/sec.

First claim

What is claimed is:

1 . A non-aqueous electrolyte secondary battery comprising: an exterior member;
a negative electrode containing a titanium-containing oxide housed in the exterior member; a positive electrode housed in the exterior member; a separator housed in the exterior member, and arranged between the positive electrode and the negative electrode; and a non-aqueous electrolyte solution housed in the exterior member, wherein at least one type or more chain carbonates are contained in a solvent of the non-aqueous electrolyte solution, and a self-diffusion coefficient of the chain carbonate in −20° C. is from 1.4×10 −10 to 2.0×10 −10 m 2 /sec.

2 . The battery according to claim 1 , wherein the separator includes a hole having a diameter of from 10 to 100 μm.

3 . The battery according to claim 1 , wherein the thickness of the separator is from 2 to 30 μm.

4 . The battery according to claim 1 , wherein the thickness of the separator is from 3 to 15 μm.

5 . The battery according to claim 1 , wherein Rsol<20 Ω·cm 2 and Rct<120 Ω·cm 2 are satisfied where the magnitude of resistance of the non-aqueous electrolyte secondary battery at a time of application of an alternating-current voltage of 1 kHz in −20° C. is Rsol, and the magnitude of resistance at a time of application of an alternating-current voltage of 0.1 Hz is Rct.

6 . The battery according to claim 1 , wherein Rsol/Rct>0.16 is satisfied where the magnitude of resistance of the non-aqueous electrolyte secondary battery at a time of application of an alternating-current voltage of 1 kHz in −20° C. is Rsol, and the magnitude of resistance at a time of application of an alternating-current voltage of 0.1 Hz is Rct.

7 . The battery according to claim 1 , wherein 0.3>Rsol/Rct>0.16 is satisfied where the magnitude of resistance of the non-aqueous electrolyte secondary battery at a time of application of an alternating-current voltage of 1 kHz in −20° C. is Rsol, and the magnitude of resistance at a time of application of an alternating-current voltage of 0.1 Hz is Rct.

8 . A battery pack comprising:
a nonaqueous electrolyte secondary battery as a cell, wherein the nonaqueous electrolyte secondary battery comprises, an exterior member, a negative electrode containing a titanium-containing oxide housed in the exterior member, a positive electrode housed in the exterior member, a separator housed in the exterior member, and arranged between the positive electrode and the negative electrode, and a non-aqueous electrolyte solution housed in the exterior member, wherein at least one type or more chain carbonates are contained in a solvent of the non-aqueous electrolyte solution, and a non-aqueous electrolyte secondary battery in which a self-diffusion coefficient of the chain carbonate in −20° C. is from 1.4×10 −10 to 2.0×10 −10 m 2 /sec, is used as a cell.

9 . The battery pack according to claim 8 wherein the separator includes a hole having a diameter of from 10 to 100 μm.

10 . The battery pack according to claim 8 , wherein the thickness of the separator is from 2 to 30 μm.

11 . The battery pack according to claim 8 , wherein the thickness of the separator is from 3 to 15 μm.

12 . The battery back according to claim 8 , wherein Rsol<20 Ω·cm 2 and Rct<120 Ω·cm 2 are satisfied where the magnitude of resistance of the non-aqueous electrolyte secondary battery at a time of application of an alternating-current voltage of 1 kHz in −20° C. is Rsol, and the magnitude of resistance at a time of application of an alternating-current voltage of 0.1 Hz is Rct.

13 . The battery pack according to claim 8 , wherein Rsol/Rct>0.16 is satisfied where the magnitude of resistance of the non-aqueous electrolyte secondary battery at a time of application of an alternating-current voltage of 1 kHz in −20° C. is Rsol, and the magnitude of resistance at a time of application of an alternating-current voltage of 0.1 Hz is Rct.

14 . The battery pack according to claim 8 , wherein 0.3>Rsol/Rct>0.16 is satisfied where the magnitude of resistance of the non-aqueous electrolyte secondary battery at a time of application of an alternating-current voltage of 1 kHz in −20° C. is Rsol, and the magnitude of resistance at a time of application of an alternating-current voltage of 0.1 Hz is Rct.

Assignees

• Toshiba Kk

Inventors

• Yamamoto Dai
• Saruwatari Hidesato
• Tanaka Masanori
• Kuriyama Kazuya
• Satake Hideki
• Hayashida Hirotaka

Classifications

• H01M50/133

  Thickness · CPC title

• H01M50/107

  having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence) · CPC title

• H01M50/103

  prismatic or rectangular (H01M50/109, H01M50/11 take precedence) · CPC title

• H01M50/469

  tubular or cylindrical · CPC title

• H01M50/105

  Pouches or flexible bags · CPC title