Nonaqueous electrolyte battery and electrical apparatus

Patent metadata

Field	Value
Publication number	US-9647298-B2
Application number	US-201615184130-A
Country	US
Kind code	B2
Filing date	Jun 16, 2016
Priority date	Nov 13, 2007
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

A nonaqueous electrolyte battery is provided. The nonaqueous electrolyte battery includes an anode; a cathode; a separator; an electrolytic solution including a solvent and an electrolyte salt; wherein the solvent includes a fluoro ethylene carbonate, wherein the nonaqueous electrolyte battery has a discharge capacity ratio of a discharge capacity B when discharging at a 5 C rate to a discharge capacity A when discharging at a 0.2 C rate ((B/A)×100%), and wherein the discharge capacity ratio is 80% or more. An electrical apparatus including a nonaqueous electrolyte battery is also provided.

First claim

The invention is claimed as follows:

1. A nonaqueous electrolyte battery comprising:
an anode;
a cathode;
a separator;
an electrolytic solution including a solvent and an electrolyte salt;
wherein the solvent includes a fluoro ethylene carbonate,
wherein the nonaqueous electrolyte battery has a discharge capacity ratio of a discharge capacity B when discharging at a 5C rate to a discharge capacity A when discharging at a 0.2C rate ((B/A)×100%), and
wherein the discharge capacity ratio is 80% or more.

2. The nonaqueous electrolyte battery according to claim 1 , wherein the nonaqueous electrolyte battery does not include a positive temperature coefficient element.

3. The nonaqueous electrolyte battery according to claim 2 , wherein the anode includes an anode active material layer including carbon as a first active material.

4. The nonaqueous electrolyte battery according to claim 3 , wherein the anode active material layer is provided on a first surface and a second surface of an anode current collector.

5. The nonaqueous electrolyte battery according to claim 4 , wherein the anode active material layer provided on the first surface of the anode current collector after charging has a first thickness, and wherein the first thickness is 75 μm or less.

6. The nonaqueous electrolyte battery according to claim 5 , wherein the anode active material layer provided on the first surface of the anode current collector before battery assemble has a second thickness, and wherein the second thickness is 65 μm or less.

7. The nonaqueous electrolyte battery according to claim 3 , wherein the anode active material layer further includes silicon as a second active material.

8. The nonaqueous electrolyte battery according to claim 7 , wherein the second active material further includes at least one of oxygen or carbon.

9. The nonaqueous electrolyte battery according to claim 7 , wherein the anode active material layer is provided on a first surface and a second surface of an anode current collector.

10. The nonaqueous electrolyte battery according to claim 9 , wherein the anode active material layer provided on the first surface of the anode current collector after charging has a first thickness, and wherein the first thickness is 75 μm or less.

11. The nonaqueous electrolyte battery according to claim 10 , wherein the anode active material layer provided on the first surface of the anode current collector before battery assemble has a second thickness, and wherein the second thickness is 65 μm or less.

12. The nonaqueous electrolyte battery according to claim 10 , wherein a content of the fluoro ethylene carbonate is 1% by mass or more and 80% by mass or less with respect to the solvent.

13. The nonaqueous electrolyte battery according to claim 12 , wherein the content of the fluoro ethylene carbonate is 3% by mass or more and 60% by mass or less with respect to the solvent.

14. The nonaqueous electrolyte battery according to claim 10 , wherein the cathode includes a lithium transition metal composite oxide including at least one of nickel, manganese, or iron.

15. The nonaqueous electrolyte battery according to claim 14 , wherein the lithium transition metal has a spinel-type structure.

16. The nonaqueous electrolyte battery according to claim 1 , further comprising a battery can configured to accommodate a battery lid and a safety valve, wherein the safety valve directly contacts with at least part of the battery lid.

17. The nonaqueous electrolyte battery according to claim 16 , wherein the battery can is a cylindrical can.

18. The nonaqueous electrolyte battery according to claim 17 , wherein a diameter of the battery can is about 18 mm and a height of the battery can is about 65 mm.

19. The nonaqueous electrolyte battery according to claim 1 , wherein the discharge capacity B is evaluated based on a first condition when the nonaqueous electrolyte battery is charged at 2C rate at 25° C. followed by a constant voltage condition to 4.2V, and then performs a first discharge at 5C rate at 25° C. to 3V, and wherein the discharge capacity A is evaluated based on a second condition when the nonaqueous electrolyte battery is charged at 2C rate at 25° C. followed by the constant voltage condition to 4.2V, and then performs a second discharge at 0.2C rate at 25° C. to 3V.

20. An electrical apparatus comprising:
a nonaqueous electrolyte battery including:
an anode;
a cathode;
a separator;
an electrolytic solution including a solvent and an electrolyte salt;
wherein the solvent includes a fluoro ethylene carbonate,
wherein the nonaqueous electrolyte battery has a discharge capacity ratio of a discharge capacity B when discharging at a 5C rate to a discharge capacity A when discharging at a 0.2C rate ((B/A)×100%), and
wherein the discharge capacity ratio is 80% or more.

21. The electrical apparatus according to claim 20 , wherein the nonaqueous electrolyte battery does not include a positive temperature coefficient element.

22. The electrical apparatus according to claim 21 , wherein the anode active material layer includes carbon as a first active material.

23. The electrical apparatus battery according to claim 22 , wherein the anode active material layer is provided on a first surface and a second surface of an anode current collector.

24. The electrical apparatus battery according to claim 23 , wherein the anode active material layer provided on the first surface of the anode current collector after charging has a first thickness, and wherein the first thickness is 75 μm or less.

25. The electrical apparatus according to claim 24 , wherein the anode active material layer provided on the first surface of the anode current collector before battery assemble has a second thickness, and wherein the second thickness is 65 μm or less.

26. The electrical apparatus according to claim 22 , wherein the anode active material layer further includes silicon as a second active material.

27. The electrical apparatus according to claim 26 , wherein the second active material further includes at least one of oxygen or carbon.

28. The electrical apparatus according to claim 24 , further comprising a battery can configured to accommodate a battery lid and a safety valve, wherein the safety valve directly contacts with at least part of the battery lid.

29. The electrical apparatus according to claim 28 , wherein the battery can is a cylindrical can.

30. The electrical apparatus according to claim 20 , wherein the discharge capacity B is evaluated based on a first condition when the nonaqueous electrolyte battery is charged at 2C rate at 25° C. followed by a constant voltage condition to 4.2V, and then performs a first discharge at 5C rate at 25° C. to 3V, and wherein the discharge capacity A is evaluated based on a second condition when the nonaqueous electrolyte battery is charged at 2C rate at 25° C. followed by the constant voltage condition to 4.2V, and then performs a second discharge at 0.2C rate at 25° C. to 3V.

Assignees

• Sony Corp

Inventors

• Yamaguchi Akira
• Hayashi Kunihiko
• Kubota Tadahiko
• Suzuki Hiroyuki
• Ichihashi Akira
• Fukushima Yuzuru
• Sato Hironori
• Kuratsuka Masaki
• Watanabe Hideto
• Tajima Kimio
• Miyamoto Masahiro

Classifications

• H01M50/417

  Polyolefins · CPC title

• H01M50/548

  on opposite sides of the cell · CPC title

• H01M50/536

  characterised by the method of fixing the leads to the electrodes, e.g. by welding · CPC title

• H01M50/534

  characterised by the material of the leads or tabs · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title