Non-aqueous electrolyte secondary battery and battery pack

Patent metadata

Field	Value
Publication number	US-9627715-B2
Application number	US-201414483354-A
Country	US
Kind code	B2
Filing date	Sep 11, 2014
Priority date	Sep 13, 2013
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

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 2 /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,
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,
the separator includes a hole having a diameter of from 10 to 100 μm,
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, and
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,
the non-aqueous electrolyte solution includes lithium electrolyte, and
the lithium electrolyte includes LiPF 6 and at least one of LiBF 4 , LiBOB (lithium bis (oxalate) borate), LiH 2 PO 3 , Li 2 HPO 3 , Li 2 PO 2 , LiPO 2 F 2 , LiFSI (lithium bis (fluorosulfonyl) imide), LiTFSI (lithium bis (trifluoromethanesulfonyl) imide), LiClO 4 (lithium percrorate), and LiAsF 6 (lithium hexafluoroarsenate).

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

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

4. 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.

5. 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,
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,
the separator includes a hole having a diameter of from 10 to 100 μm,
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, and
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,
the non-aqueous electrolyte solution includes lithium electrolyte, and
the lithium electrolyte includes LiPF 6 and at least one of LiBF 4 , LiBOB (lithium bis (oxalate) borate), LiH 2 PO 3 , Li 2 HPO 3 , Li 2 PO 2 , LiPO 2 F 2 , LiFSI (lithium bis (fluorosulfonyl) imide), LiTFSI (lithium bis (trifluoromethanesulfonyl) imide), LiClO 4 (lithium percrorate), and LiAsF 6 (lithium hexafluoroarsenate).

6. The battery pack according to claim 5 , wherein the thickness of the separator is from 2 to 30 μm.

7. The battery pack according to claim 5 , wherein the thickness of the separator is from 3 to 15 μm.

8. The battery pack according to claim 5 , 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.

9. The battery according to claim 1 , wherein the lithium electrolyte is 10 wt % or less of the electrolyte solution.

10. The battery according to claim 1 , wherein the at least one type or more chain carbonates is selected from a dimethyl carbonate, an ethyl methyl carbonate and a diethyl carbonate.

11. The battery pack according to claim 5 , wherein the lithium electrolyte is 10 wt % or less of the electrolyte solution.

12. The battery pack according to claim 5 , wherein the at least one type or more chain carbonates is selected from a dimethyl carbonate, an ethyl methyl carbonate and a diethyl carbonate.

13. The battery according to claim 1 , wherein the negative electrode includes lithium titanate having a spinel structure.

14. The battery according to claim 1 , wherein the negative electrode includes Li 4+x Ti 5 O 12 having a spinel structure where x of Li 4+x Ti 5 O 12 satisfies 0≦x 3.

15. The battery according to claim 1 , wherein the positive electrode includes an oxide, a sulfide, or a polymer.

16. The battery according to claim 1 , wherein the positive electrode includes at least one selected from the consisting group of, manganese dioxide, iron oxide, copper oxide, nickel oxide, lithium-manganese compound oxide, lithium-nickel compound oxide, lithium-cobalt compound oxide, lithium-nickel-cobalt compound oxide, lithium-manganese-cobalt compound oxide, lithium-manganese-nickel compound oxide having a spinel structure, lithium-phosphate oxide having an olivine structure, iron sulfate, vanadium oxide, and lithium-nickel-cobalt-manganese compound oxide.

17. The battery pack according to claim 5 , wherein the negative electrode includes lithium titanate having a spinel structure.

18. The battery pack according to claim 5 , wherein the negative electrode includes Li 4+x Ti 5 O 12 having a spinel structure where x of Li 4+x Ti 5 O 12 satisfies 0≦x 3.

19. The battery pack according to claim 5 , wherein the positive electrode includes an oxide, a sulfide, or a polymer.

20. The battery pack according to claim 5 , wherein the positive electrode includes at least one selected from the consisting group of; manganese dioxide, iron oxide, copper oxide, nickel oxide, lithium-manganese compound oxide, lithium-nickel compound oxide, lithium-cobalt compound oxide, lithium-nickel-cobalt compound oxide,
lithium-manganese-cobalt compound oxide, lithium-manganese-nickel compound oxide having a spinel structure, lithium-phosphate oxide having an olivine structure, iron sulfate, vanadium oxide, and lithium-nickel-cobalt-manganese compound oxide.

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