Additives for improved battery performance, improved additive-containing membranes, improved battery separators, improved batteries, and related methods

Patent metadata

Field	Value
Publication number	US-2020161618-A1
Application number	US-201716347664-A
Country	US
Kind code	A1
Filing date	Nov 7, 2017
Priority date	Nov 7, 2016
Publication date	May 21, 2020
Grant date	—

Abstract

Described herein, are battery separators, comprising the following: a microporous polymeric film; and an optional coating layer on at least one side of the microporous polymeric film, wherein at least one of the microporous polymeric film and the optional coating comprises an additive. The additive is selected from the group consisting of a lubricating agent, a plasticizing agent, a nucleating agent, a shrinkage reducing agent, a surfactant, an SEI improving agent, a cathode protection agent, a flame retardant additive, LiPF6 salt stabilizer, an overcharge protector, an aluminum corrosion inhibitor, a lithium deposition agent or improver, or a solvation enhancer, an aluminum corrosion inhibitor, a wetting agent, and a viscosity improver. Also, described herein are batteries, including lithium-ion batteries, comprising one or more of the described separators. Methods for making the battery separators are also described.

First claim

1 . A battery separator, comprising:
a microporous polymeric film; and an optional coating layer on at least one side of the microporous polymeric film, wherein at least one of the microporous polymeric film and the optional coating comprises an additive selected from the group consisting of a lubricating agent, a plasticizing agent, a nucleating agent, a shrinkage reducing agent, and a surfactant.

2 . The battery separator of claim 1 , wherein the battery separator comprises a coating on a first side of the microporous polymeric film and the coating layer comprises the additive.

3 .- 4 . (canceled)

5 . (canceled)

6 . The battery separator of claim 1 , wherein the microporous polymeric film comprises the additive, which is optionally mainly present in one or more surface regions of the microporous film.

7 . (canceled)

8 . (canceled)

9 . (canceled)

10 . (canceled)

11 . The battery separator of claim 1 , wherein the microporous polymeric film is a nonwoven, a dry-process mono-layer film, a dry-process bi-layer film, a dry-process multilayer film, or a microporous polymeric film that comprises a polyolefin.

12 . (canceled)

13 . (canceled)

14 . (canceled)

15 . The battery separator of claim 1 , wherein the additive is a lubricating agent.

16 . (canceled)

17 . (canceled)

18 . (canceled)

19 . The battery separator of claim 15 , wherein the lubricating agent is a fatty acid salt.

20 . (canceled)

21 . The battery separator of claim 19 , wherein the lubricating agent is selected from lithium stearate, sodium stearate and potassium stearate.

22 . (canceled)

23 . The battery separator of claim 15 , wherein the lubricating agent is a compound comprising one or more siloxy functional groups, including a siloxane or polysiloxane.

24 . The battery separator of claim 23 , wherein the lubricating agent is an ultra-high molecular weight polysiloxane.

25 . The battery separator of claim 1 , wherein the additive is a plasticizing agent.

26 . The battery separator of claim 1 , wherein the additive is a nucleating agent.

27 . The battery separator of claim 1 , wherein the additive is a surfactant.

28 . The battery separator of claim 1 , wherein the additive is a shrinkage reducing agent.

29 . (canceled)

30 . (canceled)

31 . (canceled)

32 . (canceled)

33 . A battery separator, comprising:
a microporous polymeric film; and an optional coating layer on at least one side of the microporous polymeric film, wherein at least one of the microporous polymeric film and the optional coating comprises an electrolyte additive.

34 . The battery separator of claim 33 , wherein the battery separator comprises a coating on a first side of the microporous polymeric film and the coating layer comprises the electrolyte additive.

35 . (canceled)

36 . (canceled)

37 . (canceled)

38 . The battery separator of claim 33 , wherein the microporous polymeric film comprises an electrolyte additive, which is optionally mainly present in one or more surface regions of the microporous film.

39 . (canceled)

40 . (canceled)

41 . (canceled)

42 . The battery separator of claim 33 , wherein the microporous polymeric film is a non-woven, a dry-process bilayer, a dry-process monolayer, a dry-process multilayer film, or a microporous polymeric film that comprises a polyolefin.

43 . (canceled)

44 . The battery separator of claim 33 , wherein the electrolyte additive is selected from the group consisting of an SEI improving agent, a cathode protection agent, a flame retardant additive, LiPF 6 salt stabilizer, an overcharge protector, an aluminum corrosion inhibitor, a lithium deposition agent or improver, or a solvation enhancer, an aluminum corrosion inhibitor, a wetting agent, and viscosity improver.

45 . The battery separator of claim 33 , wherein the electrolyte additive is selected from the group consisting of a borate salt or a vinyl carbonate.

46 . A lithium battery comprising the separator of claim 1 .

47 .- 52 . (canceled)

53 . A lithium battery comprising the separator of claim 33 .

Assignees

• Celgard Llc

Inventors

• Adams Changqing Wang
• Xiao Kang Karen
• Reinartz Stefan
• Okada Masaaki
• Stepp Brian R
• Lu Yao
• White Eric Robert
• Chemelewski Katharine

Classifications

• H01M10/052 Primary

  Li-accumulators · CPC title

• H01M2/1653

  Electricity · mapped topic

• H01M2/1686 Primary

  Electricity · mapped topic

• H01M50/491

  Porosity · CPC title

• H01M50/403

  Manufacturing processes of separators, membranes or diaphragms · CPC title