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

Patent metadata

Field	Value
Publication number	US-2018114976-A1
Application number	US-201715787149-A
Country	US
Kind code	A1
Filing date	Oct 18, 2017
Priority date	Oct 24, 2016
Publication date	Apr 26, 2018
Grant date	—

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 1

wherein 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 comprising a repeating unit represented by Formula 1:

wherein 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.

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

3 . The positive electrode for a metal secondary battery of claim 1 , wherein R in Formula 1 comprises a group represented by Formulae 1-1 to 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 an amount of the polymeric first binder comprising the repeating unit represented by Formula 1 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.

6 . 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.

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 9:1 to about 1:9.

8 . 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.

9 . The positive electrode for a metal secondary battery of claim 1 , further comprising a second binder, an oligomer, an organic solvent, an ionic liquid, and a plasticizer.

10 . The positive electrode for a metal secondary battery of claim 9 , 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.

11 . The positive electrode for a metal secondary battery of claim 9 , 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.

12 . The positive electrode for a metal secondary battery of claim 9 , wherein the oligomer comprises poly(ethylene oxide), poly(propylene oxide), poly(butylene oxide), poly(ethylene glycol), poly(ethylene glycol)diacrylate, poly(propylene glycol)diacrylate, poly(ethylene glycol)dimethacrylate, poly(propylene glycol)dimethacrylate, poly(ethylene glycol)urethane diacrylate, poly(ethylene glycol)urethane dimethacrylate, poly(ethylene glycol)urethane triacrylate, poly(ethylene glycol)urethane trimethacrylate, or a combination thereof.

13 . The positive electrode for a metal secondary battery of claim 9 , wherein an amount of the oligomer 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.

14 . The positive electrode for a metal secondary battery of claim 9 , wherein the organic solvent comprises 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, γ-butyrolactone, dioxolane, 4-methyldioxolane, N,N-dimethyl formamide, N,N-dimethyl acetamide, dimethylsulfoxide, dioxane, 1,2-dimethoxyethane, sulforane, dichloroethane, chlorobenzene, nitrobenzene, diethylene glycol, dimethyl ether, or a combination thereof.

15 . The positive electrode for a metal secondary battery of claim 9 , wherein the ionic liquid comprises a compound comprising:
a cation comprising ammonium, pyrrolidinium, pyridinium, pyrimidinium, imidazolium, piperidinium, pyrazolium, oxazolium, pyridazinium, phosphonium, sulfonium, triazolium, or a combination thereof; and an anion comprising BF 4 − , PF 6 − , AsF 6 − , SbF 6 − , AlCl 4 − , HSO 4 − , ClO 4 − , Cl − , Br, I − , SO 42 − , CF 3 SO 3 − , CF 3 CO 2 − , (C 2 FsSO 2 )(CF 3 SO 2 )N − , NO 3 − , Al 2 Cl 7 − , CH 3 COO − , CH 3 SO 3 − , (CF 3 SO 2 ) 3 C − , (CF 3 CF 2 SO 2 ) 2 N − , (CF 3 SO 2 ) 2 N − , (FSO 2 ) 2 N − , (CF 3 ) 2 PF 4 − , (CF 3 ) 3 PF 3 − , (CF 3 ) 4 PF 2 − , (CF 3 ) 5 PF − , (CF 3 ) 6 P − , SF 5 CF 2 SO 3 − , SF 5 CHFCF 2 SO 3 − , CF 3 CF 2 (CF 3 ) 2 CO − , (CF 3 SO 2 ) 2 CH − , (SF 5 ) 3 C − , (O(CF 3 ) 2 C 2 (CF 3 ) 2 O) 2 PO − , or a combination thereof.

16 . The positive electrode for a metal secondary battery of claim 9 , wherein a molar ratio of the ionic liquid to the salt is in a range of about 0.1:1 to about 2:1.

17 . The positive electrode for a metal secondary battery of claim 9 , wherein the plasticizer comprises a phthalate plasticizer, a trimellitate plasticizer, a phosphate plasticizer, a polyester plasticizer, a chloride plasticizer, or a combination thereof.

18 . The positive electrode for a metal secondary battery of claim 9 , wherein an 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.

19 . 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.

20 . The positive electrode for a metal secondary battery of claim 1 , wherein the positive electrode has an operating voltage of about 2.0 Volts to about 4.5 Volts vs. Li/Li + .

21 . The positive electrode for a metal secondary battery of claim 1 , wherein the positive active ma

Assignees

• Samsung Electronics Co Ltd
• Samsung Sdi Co Ltd

Inventors

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

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · 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

• H01M4/622 Primary

  being polymers · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title