Elastic polymer composite binder for lithium battery and method of manufacturing

Patent metadata

Field	Value
Publication number	US-2021098778-A1
Application number	US-202017063666-A
Country	US
Kind code	A1
Filing date	Oct 5, 2020
Priority date	Feb 24, 2017
Publication date	Apr 1, 2021
Grant date	—

Abstract

Provided is highly elastic polymer composite binder composition for use in an anode or cathode of a lithium battery, the composition comprising a polymerizing or cross-linking liquid precursor and a 0.01%-50% by weight of a conductive reinforcement material dispersed in the liquid precursor, wherein the liquid precursor is capable of chemically bonding to an anode active material or cathode active material in the lithium battery upon completion of polymerization or cross-linking reactions to form a high-elasticity polymer and the resulting high-elasticity polymer has a recoverable tensile strain from 5% to 700% when measured without the conductive reinforcement dispersed in the polymer.

First claim

1 . A highly elastic polymer composite binder composition for use in an anode or cathode of a lithium battery, said composition comprising a polymerizing or cross-linking liquid precursor and a 0.01%-50% by weight of a conductive reinforcement material dispersed in said liquid precursor, wherein said liquid precursor is capable of chemically bonding to an anode active material or cathode active material in said lithium battery upon completion of polymerization or cross-linking reactions to form a high-elasticity polymer and said high-elasticity polymer has a recoverable tensile strain from 5% to 700% when measured without the conductive reinforcement dispersed in said polymer.

2 . The binder composition of claim 1 , wherein said conductive reinforcement is selected from the group consisting of carbon nanotubes, graphene sheets, carbon nano-fibers, graphite nano-fibers, carbon fibers, graphite fibers, expanded graphite flakes, carbon black, acetylene black, carbon particles, graphite particles, metal nanowires or whiskers, and combinations thereof.

3 . The binder composition of claim 1 , wherein said high-elasticity polymer contains a cross-linked network polymer chains having an ether linkage, nitrile-derived linkage, benzo peroxide-derived linkage, ethylene oxide linkage, propylene oxide linkage, vinyl alcohol linkage, cyano-resin linkage, triacrylate monomer-derived linkage, tetraacrylate monomer-derived linkage, or a combination thereof in said cross-linked network of polymer chains.

4 . The binder composition of claim 1 , wherein said high-elasticity polymer contains a cross-linked network of polymer chains selected from nitrile-containing polyvinyl alcohol chains, cyanoresin chains, pentaerythritol tetraacrylate chains, pentaerythritol triacrylate chains, ethoxylated trimethylolpropane triacrylate (ETPTA) chains, ethylene glycol methyl ether acrylate (EGMEA) chains, or a combination thereof.

5 . The binder composition of claim 1 , wherein said high-elasticity polymer contains a cross-linked network of polymer chains of a conjugated polymer selected from polyacetylene, polythiophene, poly(3-alkylthiophenes), polypyrrole, polyaniline, poly(isothianaphthene), poly(3,4-ethylenedioxythiophene), alkoxy-substituted poly(p-phenylene vinylene), poly(2,5-bis(cholestanoxy) phenylene vinylene), poly(p-phenylene vinylene), poly(2,5-dialkoxy) paraphenylene vinylene, poly[(1,4-phenylene-1,2-diphenylvinylene)], poly(3′,7′-dimethyloctyloxy phenylene vinylene), polyparaphenylene, polyparaphenylene, polyparaphenylene sulphide, polyheptadiyne, poly(3-hexylthiophene), poly(3-octylthiophene), poly(3-cyclohexylthiophene), poly(3-methyl-4-cyclohexylthiophene), poly(2,5-dialkoxy-1,4-phenyleneethynylene), poly(2-decyloxy-1,4-phenylene), poly(9,9-dioctylfluorene), polyquinoline, a derivative thereof, a copolymer thereof, a sulfonated version thereof, or a combination thereof, and wherein the high-elasticity polymer has a recoverable tensile strain from 5% to 700%, when measured without a conductive additive or reinforcement dispersed in the polymer.

6 . The binder composition of claim 1 , wherein said binder composition further comprises a lithium-ion conducting material dispersed in said liquid precursor.

7 . The binder composition of claim 6 , wherein said lithium ion-conducting additive is selected from Li 2 CO 3 , Li 2 O, Li 2 C 2 O 4 , LiOH, LiX, ROCO 2 Li, HCOLi, ROLi, (ROCO 2 Li) 2 , (CH 2 OCO 2 Li) 2 , Li 2 S, Li x SO y , or a combination thereof, wherein X=F, Cl, I, or Br, R=a hydrocarbon group, x=0-1, y=1-4.

8 . The binder composition of claim 6 , wherein said lithium ion-conducting additive is selected from lithium perchlorate, LiClO 4 , lithium hexafluorophosphate, LiPF 6 , lithium borofluoride, LiBF 4 , lithium hexafluoroarsenide, LiAsF 6 , lithium trifluoro-metasulfonate, LiCF 3 SO 3 , bis-trifluoromethyl sulfonylimide lithium, LiN(CF 3 SO 2 ) 2 , lithium bis(oxalato)borate, LiBOB, lithium oxalyldifluoroborate, LiBF 2 C 2 O 4 , lithium oxalyldifluoroborate, LiBF 2 C 2 O 4 , lithium nitrate, LiNO 3 , Li-Fluoroalkyl-Phosphates, LiPF 3 (CF 2 CF 3 ) 3 , lithium bisperfluoro-ethysulfonylimide, LiBETI, lithium bis(trifluoromethanesulphonyl)imide, lithium bis(fluorosulphonyl)imide, lithium trifluoromethanesulfonimide, LiTFSI, an ionic liquid-based lithium salt, or a combination thereof.

9 . The binder composition of claim 6 , wherein said lithium ion-conducting additive is selected from poly(ethylene oxide) (PEO), Polypropylene oxide (PPO), poly(acrylonitrile) (PAN), poly(methyl methacrylate) (PMMA), poly(vinylidene fluoride) (PVdF), Poly bis-methoxy ethoxyethoxide-phosphazenex, Polyvinyl chloride, Polydimethylsiloxane, poly(vinylidene fluoride)-hexafluoropropylene (PVDF-HFP), a sulfonated derivative thereof, or a combination thereof.

10 . The binder composition of claim 1 , wherein said high-elasticity polymer has a lithium ion conductivity from 1×10 −8 S/cm to 2×10 −2 S/cm.

11 . The binder composition of claim 1 , wherein said binder composition further comprises a foaming agent or blowing agent dispersed in said liquid precursor.

12 . An anode or cathode active material layer for a lithium battery, said anode or cathode active material layer comprising multiple particles of the anode or cathode active material and an optional conductive additive that are bonded together by a polymer composite binder comprising a high-elasticity polymer matrix and 0.01%-50% by weight of a conductive reinforcement material dispersed in said high-elasticity polymer matrix, wherein the high-elasticity polymer has a recoverable tensile strain from 5% to 700% when measured without the conductive reinforcement dispersed in said polymer and the conductive reinforcement material is selected from the group consisting of graphite nano-fibers, carbon fibers, graphite fibers, expanded graphite flakes, carbon black, acetylene black, carbon particles, graphite particles, metal nanowires or whiskers, carbon nanotubes, graphene sheets, or carbon nano-fibers, and combinations thereof.

13 . The anode or cathode active material layer of claim 12 , wherein the high-elasticity polymer has a lithium ion conductivity no less than 10 −8 S/cm at room temperature.

14 . The anode or cathode active material layer of claim 12 , wherein said high-elasticity polymer contains a cross-linked network of polymer chains.

15 . The anode or cathode active material layer of claim 14 , wherein said high-elasticity polymer contains a cross-linked network of polymer chains having an ether linkage, nitrile-derived linkage, benzo peroxide-derived linkage, ethylene oxide linkage, propylene oxide linkage, vinyl alcohol linkage, cyano-resin linkage, triacrylate monomer-derived linkage, tetraacrylate monomer-derived linkage, or a combination thereof in said cross-linked network of polymer chains.

16 . The anode or cathode active material layer of claim 14 , wherein said high-elasticity polymer contains a cross-linked network of polymer chains selected from nitrile-containing polyvinyl alcohol chains, cyanoresin chains, pentaerythritol tetraacrylate chains, pentaerythritol triacrylate chains, ethoxylated trimethylolpropane triacrylate (ETPTA) chains, ethylene glycol methyl ether acrylate (EGMEA) chains, or a combination thereof.

17 . The anode or cathode active material layer of claim 14 , wherein said high-elasticity polymer contains a material or polymer chains selected from natural polyisoprene, synthetic polyisoprene, polybutadiene, chloroprene rubber, polychloroprene, butyl rubber, styrene-butadiene rubber, nitrile rubber, ethylene propylene rubber, ethylene

Assignees

• Global Graphene Group Inc

Inventors

• He Hui
• Jang Bor Z

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M4/62 Primary

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M4/364 Primary

  as mixtures · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title