US2020259159A1PendingUtilityA1

Elastic and stretchable gel polymer electrolyte

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Assignee: HERCULES LLCPriority: Oct 4, 2017Filed: Oct 3, 2018Published: Aug 13, 2020
Est. expiryOct 4, 2037(~11.2 yrs left)· nominal 20-yr term from priority
Inventors:Alan E. GoliaszewskiShufu PengDonghai WangJiangxuan SongQingquan HuangKelly A. Brush
C08G 18/4854H01M 4/13H01M 2300/0085C08G 18/7671H01M 4/587H01M 4/364H01M 4/139H01M 10/0565H01M 10/052H01M 4/625H01M 4/483H01M 2004/027H01M 2300/004H01M 4/62C08G 18/7664H01M 10/0525H01M 4/662H01M 4/466H01M 4/621H01M 4/583H01M 4/387H01M 4/386C08G 18/3203H01M 4/0404H01M 4/133H01M 4/1393C09D 175/08H01M 10/0566C08G 18/1808C08G 18/12H01M 4/622Y02E60/10
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Claims

Abstract

The present disclosure relates generally to a coated electrode for use in preparation of lithium ion batteries and methods of preparing such. More particularly, the present disclosure relates to a polymer coating composition for coating electrodes of the lithium ion batteries (LIBs). The polymer coating composition comprises a polyurethane gel polymer electrolyte (GPE) formed by a reaction of an isocyanate and a polyol.

Claims

exact text as granted — not AI-modified
1 . A coated electrode for use in preparation of a lithium ion battery, comprising:
 an electrode comprising: (1) a film comprising) an electrode active material, (ii) a binder composition, and (iii) a conductive agent; and (2) a current collector; and a polymer coating composition comprising a. polyurethane gel polymer electrolyte,   wherein the polymer coating composition substantially covers an outer surface of the electrode.   
     
     
         2 . The electrode of  claim 1 , wherein the polyurethane gel polymer electrolyte comprises a polyurethane formed by a reaction of (i) isocyanate and (ii) a polyol. 
     
     
         3 . The electrode of  claim 2 , wherein the isocyanate is an aromatic diisocyanate. 
     
     
         4 . The electrode of  claim 3 , wherein the isocyanate is 4,4′-methylenebis(phenyl isocyanate) 
     
     
         5 . The electrode of  claim 2 , wherein the polyol is a polyether polyol. 
     
     
         6 . The electrode of  claim 5 , wherein the polyol poly(tetrahydrofuran), 
     
     
         7 . The electrode of  claim 2 , wherein a molar ratio of the polyol to the isocyanate is in a range of from about 1.0:1.2 to about 1.0:2.0. 
     
     
         8 . The electrode of  claim 7 , wherein the molar ratio of the polyol to the isocyanate is about 1.0:1.5. 
     
     
         9 . The electrode of  claim 2 , wherein the polyol has a number average molecular weight in arrange of from about 1,000 to about 3,500 Daltons. 
     
     
         10 . The electrode of  claim 9 , wherein the polyol has a number average molecular weight of about 1,570 Daltons. 
     
     
         11 . The electrode of  claim 2 , wherein the reaction is substantially free of ethylene diamine. 
     
     
         12 . The electrode of  claim 2 , wherein the reaction is quenched by a quenching agent. 
     
     
         13 . The electrode of  claim 12 , wherein the quenching agent is selected from the group consisting of methanol, ethanol, isopropanol and butanol, 
     
     
         14 . The electrode of  claim 1 , wherein the polymer coating composition is solution-coated on the electrode. 
     
     
         15 . The electrode of  claim 1 , wherein the electrode active material is an anode active material. 
     
     
         16 . The electrode of  claim 15 , wherein the anode active material is selected from the group consisting of (A) a carbonaceous material, (B) a silicon- based alloy, (C) a complex compound comprising a carbonaceous material and a metal selected from the group consisting of Al, Ag, Bi, Ge, Mg, Pb, Si, Sn, Ti, and combinations thereof, (D) a lithium complex metal oxide, (E) a lithium-containing nitride, and (F) combinations of components comprising items (A)-(E). 
     
     
         17 . The electrode composition of  claim 16 , wherein the anode active material comprises graphite and silicon oxide, wherein a weight ratio of the graphite to the silicon oxide is in a range of from about 99:1 to about 1:99. 
     
     
         18 . The electrode of  claim 1 , wherein the binder composition is substantially free of polyurethane. 
     
     
         19 . The electrode of  claim 1 , wherein the conductive agent is conductive carbon. 
     
     
         20 . The electrode of  claim 1 , wherein the current collector is selected from the group consisting of aluminum, carbon, copper, stainless steel, nickel, zinc, silver, and combinations thereof. 
     
     
         21 . A method of making a coated electrode for use in preparation of a lithium ion battery comprising:
 combining (1) an electrode active material, (2) a binder composition, and (3) a conductive agent to form a slurry;   applying the slurry to a current collector to form a coated current collector comprising a slurry layer on the current collector;   drying the slurry layer on the coated current collector to form a film on the current collector, wherein the electrode comprises the film and the current collector;   applying a polymer coating composition in solvent to the electrode to form a coated electrode having. an outer surface substantially covered by the polymer coating composition; and   evaporating the solvent from the polymer coating composition to form a polyurethane gel polymer electrolyte coating on the electrode.   
     
     
         22 . The method of  claim 21 , wherein a mass ratio of the electrode active material to the conductive agent to the binder composition is about 8:1:1. 
     
     
         23 . The method of  claim 21 , wherein the polymer coating composition has a mass loading in a range of from about 0.1 mg/cm 2  to about 0.9 mg/cm 2 . 
     
     
         24 . The method of  claim 21 , wherein the polyurethane gel polymer electrolyte comprises a polyurethane formed by a reaction comprising (i) an isocyanate and (ii) a polyol. 
     
     
         25 . The method of  claim 24 , wherein the polyurethane is present in the polymer coating composition in a range of from about 1% to about 25% by weight. 
     
     
         26 . The method of  claim 24 , wherein the isocyanate is an aromatic diisocyanate. 
     
     
         27 . The method of  claim 26 , wherein the aromatic isocyanate is 4,4′-methylenebis(phenyl isocyanate). 
     
     
         28 . The method of  claim 24 , wherein the polyol is a polyether polyol. 
     
     
         29 . The method, of  claim 28 , wherein the polyether polyol is poly(tetrahydrofuran). 
     
     
         30 . The method of  claim 24 , wherein a molar ratio of the polyol to the isocyanate is in a range of from about 1.0:1.2 to about 1.0:2.0. 
     
     
         31 . The method of  claim 30 , wherein the molar ratio of the polyol to the isocyanate is about 1.0:1.5. 
     
     
         32 . The method of  claim 24 , wherein the polyol has a number average molecular weight in a range of from about 1,000 to about 3,500 Daltons. 
     
     
         33 . The method of  claim 32 , wherein the polyol has a number average molecular weight of about 1,570 Daltons. 
     
     
         34 . The method of  claim 24 , wherein the reaction is substantially free of ethylene diamine. 
     
     
         35 . The method of  claim 21 , wherein the polymer coating composition is solution-coated an the electrode. 
     
     
         36 . The method of  claim 21 , wherein the electrode active material is an anode active material. 
     
     
         37 . The method of  claim 36 , wherein the anode active material is selected from the group consisting of
 (A) a carbonaceous material, (B) a silicon-based alloy, (C) a complex compound comprising a carbonaceous material and a metal selected from the group consisting of Al, Ag, Bi, Ge, Mg, Pb, Si, Sn, Ti, and combinations thereof, (D) a lithium complex metal oxide, (E) a lithium-containing nitride, and (F) combinations of components comprising items (A)-(E).   
     
     
         38 . The method of  claim 37 , wherein the anode active material comprises graphite and silicon oxide, wherein a eight ratio of the graphite to the silicon oxide is in a range of from about 99;1 to about 1:99. 
     
     
         39 . The method of  claim 21 , wherein the binder composition is substantially free of polyurethane. 
     
     
         40 . The method of  claim 21 , wherein the conductive agent is selected from the group consisting of conductive carbon, carbon nanotubes, carbon black, carbon fiber, graphite, graphene, and combinations thereof. 
     
     
         41 . The method of  claim 21 , wherein the current collector is selected from the group consisting of aluminum, carbon, copper, stainless steel, nickel, zinc, silver, and combinations thereof. 
     
     
         42 . The method of  claim 21 , wherein the solvent is selected from the group consisting of N,N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidone (NMP), tetrahydrofuran (THF), dimethyl sulfoxide (DMSO), tetramethylsilane (TMS), and dimethylformamide (DMF).

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