阅读说明：本技术 涂有经表面处理的氧化铝的锂离子电池隔膜 (Lithium ion battery separator coated with surface treated alumina ) 是由 黄元璋 P-H·谢 D-W·金 J·安 S·李 T-S·柳 于 2020-04-28 设计创作，主要内容包括：本发明涉及一种用于锂离子电池的隔膜,所述隔膜包括涂有包含粘接剂和用通式(I)或(Ia)的硅烷表面处理的氧化铝颗粒的涂层的有机基材；本发明涉及合成所述隔膜的方法；以及所述隔膜在锂电池中的用途。(The present invention relates to a separator for a lithium ion battery, comprising an organic substrate coated with a coating comprising a binder and aluminum oxide particles surface treated with a silane of general formula (I) or (Ia); the invention relates to a method for synthesizing said membrane; and the use of the separator in a lithium battery.)

1. A separator for a lithium ion battery, the separator comprising an organic substrate coated with a coating layer comprising a binder and a surface-treated alumina, wherein the surface-treated alumina is prepared by surface-treating alumina with a compound of general formula (I) or (Ia):

wherein R is H or CH₃

0≤h≤2

A is H or a branched or unbranched C1 to C4 alkyl residue,

b is a branched or unbranched aliphatic, aromatic or mixed aliphatic-aromatic C1 to C30 carbon-based radical,

x is selected from Cl or a group OY, wherein Y is a H, C1 to C30 branched or unbranched alkyl, alkenyl, aryl, or aralkyl group, a branched or unbranched C2 to C30 alkyl ether group, or a branched or unbranched C2 to C30 alkyl polyether group, or mixtures thereof.

2. The membrane of claim 1, wherein the compound of formula (I) is selected from the group consisting of 3- (triethoxysilyl) propyl methacrylate, 3- (trimethoxysilyl) propyl methacrylate, 3- (trichlorosilyl) propyl methacrylate, and mixtures thereof.

3. The separator of claim 1, wherein the general formula (Ia)) Is selected from (dichlorosilanediyl) bis (propane-3, 1-diyl) bis (2-methacrylate) (Ia, R ═ CH₃,B＝-(CH₂)₃-, X ═ Cl), (dimethoxysilanediyl) bis (propane-3, 1-diyl) bis (2-methacrylate) (Ia, R ═ CH₃,B＝-(CH₂)₃-,X＝OCH₃) (diethoxysilanediyl) bis (propane-3, 1-diyl) bis (2-methacrylate) (Ia, R ═ CH)₃,B＝-(CH₂)₃-,X＝OC₂H₅) And mixtures thereof.

4. The separator according to any one of claims 1 to 3, wherein the surface-treated alumina is fumed alumina.

5. The separator according to any one of claims 1 to 4, wherein the surface-treated alumina has 50m²G to 150m²BET specific surface area in g.

6. The separator according to any one of claims 1 to 5, wherein the surface-treated alumina has a carbon content of 0.5 to 5.0 wt%.

7. The separator according to any one of claims 1 to 6, wherein the surface-treated alumina has a number average particle size d of 20nm-400nm₅₀。

8. The separator according to any one of claims 1 to 7, wherein the organic substrate comprises a polyolefin resin, a fluorinated polyolefin resin, a polyester resin, a polyacrylonitrile resin, a cellulose resin, a nonwoven fabric, or a mixture thereof.

9. The separator of any one of claims 1 to 8, wherein the binder is selected from the group consisting of polyvinylidene fluoride, copolymers of vinylidene fluoride and hexafluoropropylene, polyvinyl acetate, polyethylene oxide, polymethyl methacrylate, polyethylacrylate, polyvinyl chloride, polyurethane, polyacrylonitrile, copolymers of ethylene and vinyl acetate, carboxymethyl cellulose, polyimide, and mixtures thereof.

10. A separator as claimed in any one of claims 1 to 9 wherein the total thickness of the separator is 5-200 μ ι η.

11. Separator according to any one of claims 1 to 10, wherein the thickness of the coating is 0.1 μm-20 μm.

12. A method of producing a membrane as claimed in any one of claims 1 to 11, the method comprising the steps of:

1) preparing surface-treated alumina by surface-treating alumina with a surface-treating agent;

2) preparing a coating mixture comprising the surface-treated alumina and a binder;

3) coating the surface of the organic substrate with the coating mixture to form a coating layer comprising the surface-treated alumina and the binder on the surface of the organic substrate.

13. Use of a separator according to any one of claims 1 to 11 as a constituent part of a lithium ion battery.

14. Use of a separator according to claim 13, wherein the lithium ion battery comprises a gel electrolyte.

15. A lithium ion battery comprising the separator of any one of claims 1 to 11.