Battery

Patent metadata

Field	Value
Publication number	US-10707539-B2
Application number	US-201715816588-A
Country	US
Kind code	B2
Filing date	Nov 17, 2017
Priority date	Nov 13, 2007
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

A battery is provided including an anode, a cathode and an electrolyte; wherein the electrolyte includes one or both of fluoro ethylene carbonate and difluoro ethylene carbonate in an amount of 0.5% by mass or more and 10% by mass or less, wherein the anode includes an anode active material layer provided on an anode current collector, and wherein a thickness of the anode active material layer, after charging the battery, is 58 um or more and 75 um or less.

First claim

The invention is claimed as follows:

1. A battery comprising:
an anode, a cathode and an electrolyte;
wherein the electrolyte includes one or both of fluoro ethylene carbonate and difluoro ethylene carbonate in an amount of 0.5% by mass or more and 10% by mass or less,
wherein the anode includes an anode active material layer provided on an anode current collector, and
wherein a thickness of the anode active material layer, after charging the battery, is 58 um or more and 75 um or less;
wherein a 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%) is 80% or more.

2. The battery according to claim 1 , wherein the thickness of the anode active material layer, after charging the battery, is 63 um or more and 69 um or less.

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

4. The battery according to claim 1 , wherein the anode current collector includes a first surface and a second surface, and wherein the anode active material layer is provided on the first and second surfaces of the anode current collector.

5. The battery according to claim 1 , wherein the anode active material layer includes a first active material that includes carbon.

6. The battery according to claim 5 , wherein the anode active material layer further includes a second active material that includes silicon.

7. The battery according to claim 6 , wherein the second active material further includes one or both of oxygen and carbon.

8. The battery according to claim 1 , wherein the cathode includes a cathode active material,
wherein the cathode active material includes one or both of a composite oxide including lithium and a transition metal element, and a phosphoric acid compound including lithium and a transition metal element.

9. The battery according to claim 8 , wherein the transition metal element is one or more of nickel, manganese and iron.

10. The battery according to claim 8 , wherein the composite oxide has a spinel-type structure.

11. The battery according to claim 8 , wherein the composite oxide is expressed by a formula LixMIO2 and the phosphoric acid compound is expressed by a formula LiyMIIPO4,
wherein MI and MII represent one or more transition metal elements, and wherein 0.05≤x≤1.10, and wherein 0.05≤y≤1.10.

12. The battery according to claim 8 , wherein the composite oxide is any one of a lithium cobalt composite oxide, a lithium nickel complex oxide, and a lithium nickel cobalt composite oxide.

13. The battery according to claim 8 , wherein the phosphoric acid compound is any one of a lithium-iron phosphoric acid compound, and a lithium-iron manganese phosphoric acid.

14. The battery according to claim 1 , further comprising a battery can configured to accommodate a battery lib and a safety valve, wherein the safety valve directly contacts at least part of the battery lib.

15. The battery according to claim 14 , wherein the battery can is a cylindrical can.

16. The battery according to claim 15 , wherein a diameter of the battery can is about 18 mm and a height of the battery can is about 65 mm.

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

18. The battery according to claim 1 , wherein the electrolyte contains a high boiling point solvent having a boiling point higher than 150° C. in atmospheric pressure and a low boiling point solvent having a boiling point lower than 150° C. in atmospheric pressure.

19. The battery according to claim 18 , wherein the high boiling point solvent includes one or more of cyclic carbonates, lactones, lactams, and cyclic sulfones, and wherein the low boiling point solvent includes at least one of chain carbonates, chain carboxylates, ketones, ethers, chain amides, and chain carbamates.

20. The battery according to claim 1 , wherein the electrolyte includes fluoro ethylene carbonate and difluoro ethylene carbonate.

21. The battery according to claim 1 , wherein the one or both of fluoro ethylene carbonate and difluoro ethylene carbonate is capable of suppressing an increase in temperature associated with the battery.

22. An electrical apparatus comprising the battery according to claim 1 .

23. A power tool comprising the battery according to claim 1 .

24. An electrical vehicle comprising the battery according to claim 1 .

25. A hybrid vehicle comprising the battery according to claim 1 .

Assignees

• Murata Manufacturing Co

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