Binder for rechargeable battery, separator for rechargeable battery including same, and rechargeable battery including same

Patent metadata

Field	Value
Publication number	US-10050246-B2
Application number	US-201514960042-A
Country	US
Kind code	B2
Filing date	Dec 4, 2015
Priority date	Dec 26, 2014
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

A binder for a rechargeable battery includes an IPN-type acrylic-based resin including a hard segment having a glass transition temperature ranging from greater than or equal to about 50° C. and less than equal to about 200° C. and a soft segment having a glass transition temperature in a range of greater than or equal to about −100° C. and less than or equal to about 30° C.

First claim

What is claimed is:

1. A binder for a rechargeable lithium ion battery comprising an interpenetrating polymer network (IPN)-type acrylic-based resin including a hard segment having a glass transition temperature (Tg) of greater than or equal to about 50° C. and less than or equal to about 200° C.; and a soft segment having a glass transition temperature (Tg) of greater than or equal to about −100° C. and less than or equal to about 30° C.,
wherein the hard segment at least comprises one homopolymer selected from polymethacrylonitrile, poly N-(isobutoxymethyl)acrylamide and poly N-phenylmethacrylamide, and the soft segment comprises at least one homopolymer selected from polybutyl acrylate and poly 2-cyanoethylacrylate, and
wherein the hard segment has a Hildebrand solubility parameter of greater than or equal to about 21 and less than or equal to about 25, and the soft segment has a Hildebrand solubility parameter of greater than or equal to about 16 and less than or equal to about 25.

2. The binder of claim 1 , wherein the hard segment is having a glass transition temperature (Tg) of greater than or equal to about 50° C. and less than or equal to about 150° C.

3. A separator for a rechargeable lithium ion battery, comprising a substrate and a coating layer formed on at least one surface of the substrate, wherein the coating layer comprises a binder comprising an interpenetrating polymer network (IPN)-type acrylic-based resin including a hard segment having a glass transition temperature (Tg) of greater than or equal to about 50° C. and less than or equal to about 200° C.; and a soft segment having a glass transition temperature (Tg) of greater than or equal to about −100° C. and less than or equal to about 30° C.; and
wherein the hard segment at least comprises one homopolymer selected from polymethacrylonitrile, poly N-(isobutoxymethyl)acrylamide and poly N-phenylmethacrylamide, and the soft segment comprises at least one homopolymer selected from polybutyl acrylate and poly 2-cyanoethylacrylate.

4. A rechargeable lithium ion battery comprising:
a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte; wherein the separator further comprises a substrate and a coating layer formed on at least one surface of the substrate, wherein the coating layer comprises a binder comprising an interpenetrating polymer network (IPN)-type acrylic-based resin including a hard segment having a glass transition temperature (Tg) of greater than or equal to about 50° C. and less than or equal to about 200° C.; and a soft segment having a glass transition temperature (Tg) of greater than or equal to about −100° C. and less than or equal to about 30° C.; and
wherein the hard segment at least comprises one homopolymer selected from polymethacrylonitrile, poly N-(isobutoxymethyl)acrylamide and poly N-phenylmethacrylamide, and the soft segment comprises at least one homopolymer selected from polybutyl acrylate and poly 2-cyanoethylacrylate.

5. The rechargeable lithium ion battery of claim 4 , wherein the coating layer of the separator further comprises an inorganic particle.

6. The rechargeable lithium ion battery of claim 4 , wherein the binder comprises an interpenetrating polymer network (IPN)-type acrylic-based resin including a hard segment having a glass transition temperature (Tg) of greater than or equal to about 50° C. and less than or equal to about 150° C.; and a soft segment having a glass transition temperature (Tg) of greater than or equal to about −100° C. and less than or equal to about 30° C.

7. The rechargeable lithium ion battery of claim 4 , wherein the hard segment of binder has a Hildebrand solubility parameter of greater than or equal to about 21 and less than or equal to about 25, and the soft segment has a Hildebrand solubility parameter of greater than or equal to about 16 and less than or equal to about 25.

8. The rechargeable lithium ion battery of claim 4 wherein charge-reaching voltage is greater than or equal to about 4.3 V and less than or equal to about 5.0 V.

9. The rechargeable lithium ion battery of claim 4 , wherein the positive electrode further includes a current collector and a positive active material.

10. The rechargeable lithium ion battery of claim 9 , wherein the positive active material comprises a solid-solution oxide selected from a group consisting of Li a Mn x Co y Ni z O 2 (1.150≤a≤1.430, 0.45≤x≤0.6, 0.10≤y≤0.15, 0.15≤z≤0.28), LiMn x Co y Ni z O 2 (0.3≤x≤0.85, 0.10≤y≤0.3, 0.10≤z≤0.3), and LiMn 1.5 Ni 0.5 O 4 .

Assignees

• Samsung Sdi Co Ltd
• Samsug Sdi Co Ltd

Inventors

• Fukuchi Iwao

Classifications

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M50/443

  Particulate material · CPC title

• H01M50/457

  comprising three or more layers · CPC title

• H01M50/451

  comprising layers of only organic material and layers containing inorganic material · CPC title

• H01M50/489

  Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties · CPC title