Positive electrode for metal secondary battery and metal secondary battery including the same

Patent metadata

Field	Value
Publication number	US-11075373-B2
Application number	US-201715787149-A
Country	US
Kind code	B2
Filing date	Oct 18, 2017
Priority date	Oct 24, 2016
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

A positive electrode for a metal secondary battery includes a positive current collector; and a positive active material layer disposed on the positive current collector, wherein the positive active material layer includes: a positive active material, a salt including an alkali metal salt, an alkaline earth metal salts, or a combination thereof, and a polymeric first binder including a repeating unit represented by Formula 1wherein R is a substituted or unsubstituted C2-C5 alkylene group, a substituted or unsubstituted C2-C6 alkoxylene group, a substituted or unsubstituted C2-C6 alkoxycarbonylene group, a substituted or unsubstituted C2-C6 alkylene oxide group, or a combination thereof, and n is an integer from 90 to 2,700. Also a metal secondary battery including the same.

First claim

What is claimed is:

1. A positive electrode for a metal secondary battery, the positive electrode comprising
a positive current collector; and
a positive active material layer disposed on the positive current collector, wherein the positive active material layer comprises:
a positive active material,
a salt comprising an alkali metal salt, an alkaline earth metal salt, or a combination thereof, and
a polymeric first binder consisting essentially of a repeating unit represented by Formula 1:

wherein R is a C2-C5 alkylene group substituted with a halogen atom, a methyl group, a C1-C20 alkyl group substituted with a halogen atom, a hydroxyl group, a nitro group, a cyano group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group and a salt thereof, a benzylcarboxylic acid group and a salt thereof, a sulfonic acid group and a salt thereof, a phosphoric acid group and a salt thereof, a C2-C20 alkenyl group, a C2-C20 alkynyl group, a C3-C20 cycloalkyl group, a C6-C20 aryl group, a C6-C20 heteroaryl group, a C7-C20 arylalkyl group, or a C6-C20 heteroarylalkyl group,
a C2-C6 alkoxylene group substituted with a halogen atom, a methyl group, a C1-C20 alkyl group substituted with a halogen atom, a hydroxyl group, a nitro group, a cyano group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group and a salt thereof, a benzylcarboxylic acid group and a salt thereof, a sulfonic acid group and a salt thereof, a phosphoric acid group and a salt thereof, a C2-C20 alkenyl group, a C2-C20 alkynyl group, a C3-C20 cycloalkyl group, a C6-C20 aryl group, a C6-C20 heteroaryl group, a C7-C20 arylalkyl group, a C6-C20 heteroarylalkyl group, or an unsubstituted C2-C6 alkoxylene group,
a C2-C6 alkoxycarbonylene group substituted with a halogen atom, a methyl group, a C1-C20 alkyl group substituted with a halogen atom, a hydroxyl group, a nitro group, a cyano group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group and a salt thereof, a benzylcarboxylic acid group and a salt thereof, a sulfonic acid group and a salt thereof, a phosphoric acid group and a salt thereof, a C2-C20 alkenyl group, a C2-C20 alkynyl group, a C3-C20 cycloalkyl group, a C6-C20 aryl group, a C6-C20 heteroaryl group, a C7-C20 arylalkyl group, a C6-C20 heteroarylalkyl group, or an unsubstituted C2-C6 alkoxycarbonylene group,
a C2-C6 alkylene oxide group substituted with a halogen atom, a methyl group, a C1-C20 alkyl group substituted with a halogen atom, a hydroxyl group, a nitro group, a cyano group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group and a salt thereof, a benzylcarboxylic acid group and a salt thereof, a sulfonic acid group and a salt thereof, a phosphoric acid group and a salt thereofa C2-C20 alkenyl group, a C2-C20 alkynyl group, a C3-C20 cycloalkyl group, a C6-C20 aryl group, a C6-C20 heteroaryl group, a C7-C20 arylalkyl group, a C6-C20 heteroarylalkyl group, or an unsubstituted C2-C6 alkylene oxide group, or a combination thereof,
n is an integer from 90 to 2,700; and
wherein an amount of the polymeric first binder is in a range of about 0.1 parts by weight to about 30 parts by weight, based on 100 parts by weight of the positive electrode.

2. The positive electrode for a metal secondary battery of claim 1 , wherein R in Formula 1 is a C2-C5 alkylene group substituted with a methyl group, a phenyl group, a benzyl group, or a benzylcarboxyl group.

3. The positive electrode for a metal secondary battery of claim 1 , wherein R in Formula 1 comprises a group represented by Formulae 1-6 to 1-8, 1-11-1-13, or a combination thereof:

wherein * is a binding site to a main chain of a polymer of the repeating unit represented by Formula 1.

4. The positive electrode for metal secondary battery of claim 1 , wherein n in Formula 1 is an integer from 100 to 1,800.

5. The positive electrode for a metal secondary battery of claim 1 , wherein the salt comprises LiSCN, LiN(CN) 2 , LiClO 4 , LiBF 4 , LiAsF 6 , LiPF 6 , LiCF 3 SO 3 , Li(CF 3 SO 2 ) 2 N, LiSbF 6 , Li(CF 3 SO 2 ) 3 C, LiN(SO 2 C 2 F 5 ) 2 , LiPF 3 (C 2 F 5 ) 3 , LiPF 3 (CF 3 ) 3 , LiB(C 2 O 4 ) 2 , NaSCN, NaSO 3 CF 3 , NaN(SO 2 CF 3 ) 2 , KN(SO 2 CF 3 ) 2 , Ba(N(SO 2 CF 3 ) 2 ) 2 , Ca(N(SO 2 CF 3 ) 2 ) 2 , or a combination thereof.

6. The positive electrode for a metal secondary battery of claim 1 , wherein a weight ratio of the polymeric first binder comprising the repeating unit represented by Formula 1 to the salt is in a range of about 9:1 to about 1:9.

7. The positive electrode for a metal secondary battery of claim 1 , wherein a weight ratio of the polymeric first binder comprising the repeating unit represented by Formula 1 to the salt is in a range of about 8:2 to about 5:5.

8. The positive electrode for a metal secondary battery of claim 1 , further comprising a second binder, an organic solvent, or a plasticizer, and
wherein an amount of the second binder is in a range of about 0.1 parts by weight to about 50 parts by weight, based on 100 parts by weight of the positive electrode.

9. The positive electrode for a metal secondary battery of claim 8 , wherein the second binder comprises polyvinylidene difluoride, polyvinyl alcohol, a polyacrylic ester, a vinylidene fluoride-hexafluoro propylene copolymer, chloropolyethylene, a polymethacrylic acid ester, an ethylene-vinylalcohol copolymer, a polyimide, a polyamide, a polyamideimide, a carboxylic acid derivative thereof, or a combination thereof.

10. The positive electrode for a metal secondary battery of claim 8 , wherein the organic solvent comprises N-methylpyrrolidone, propylene carbonate, ethylene carbonate, fluoroethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, methylethyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, methylisopropyl carbonate, dipropyl carbonate, dibutyl carbonate, benzonitrile, acetonitrile, tetrahydrofuran, 2-methyltetrahydrofuran, y-butyrolactone, dioxolane, 4-methyldioxolane, N,N-dimethyl formamide, N,N-dimethylacetamide, dimethylsulfoxide, dioxane, 1,2-dimethoxyethane, sulforane, dichloroethane, chlorobenzene, nitrobenzene, diethylene glycol, dimethyl ether, or a combination thereof.

11. The positive electrode for a metal secondary battery of claim 8 , wherein the plasticizer comprises a phthalate plasticizer, a trimellitate plasticizer, a phosphate plasticizer, a polyester plasticizer, a chloride plasticizer, or a combination thereof, and the amount of the plasticizer is in a range of about 0.1 parts by weight to about 50 parts by weight, based on 100 parts by weight of the positive electrode.

12. The positive electrode for a metal secondary battery of claim 1 , wherein the positive active material comprises a compound capable of intercalation and deintercalation of lithium, inorganic sulfur, or a sulfur compound.

13. The positive electrode for a metal secondary battery of claim 1 , wherein the positive active material layer has a peel strength of about 0.2 kilo-Newtons per meter to about 0.8 kilo-Newtons per meter with respect to the positive current collector.

14. A metal secondary battery comprising:
a negative electrode comprising lithium metal or a lithium alloy;
the positive electrode of claim 1 ; and
a separator interposed between the negative electrode and the

Assignees

• Samsung Electronics Co Ltd
• Samsung Sdi Co Ltd

Inventors

• Lee Dongjin
• Jeong Joonseon
• Kim Chansu
• Yang Yooseong
• Yu Taehwan

Classifications

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title

• H01M4/136 Primary

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title

• H01M10/0565

  Polymeric materials, e.g. gel-type or solid-type · CPC title

• C08G63/06

  derived from hydroxycarboxylic acids · CPC title

• H01M4/137 Primary

  Electrodes based on electro-active polymers · CPC title