US20180048025A1 - Additive containing electrolytes for high energy rechargeable metal anode batteries - Google Patents

Additive containing electrolytes for high energy rechargeable metal anode batteries Download PDF

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US20180048025A1
US20180048025A1 US15/676,532 US201715676532A US2018048025A1 US 20180048025 A1 US20180048025 A1 US 20180048025A1 US 201715676532 A US201715676532 A US 201715676532A US 2018048025 A1 US2018048025 A1 US 2018048025A1
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lithium
electrochemical cell
rechargeable electrochemical
bis
electrolyte
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Robert Jilek
Robert Ellis Doe
David Eaglesham
Andrew J. Gmitter
Jocelyn M. Newhouse
Matthew Trahan
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Viking Power Systems Pte Ltd
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PELLION TECHNOLOGIES Inc
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Publication of US20180048025A1 publication Critical patent/US20180048025A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0567—Liquid materials characterised by the additives
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0568—Liquid materials characterised by the solutes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0569—Liquid materials characterised by the solvents
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/46—Accumulators structurally combined with charging apparatus
    • H01M2/14—
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H01M4/381—Alkaline or alkaline earth metals elements
    • H01M4/382—Lithium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M2010/4292—Aspects relating to capacity ratio of electrodes/electrolyte or anode/cathode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the invention relates to electrochemical cells in general and particularly to secondary electrochemical cells containing non-aqueous electrolytes and metal anodes.
  • Rechargeable or secondary electrochemical storage devices or batteries have wide-ranging applications and improvement of battery performance is a long-standing goal.
  • Li-ion batteries contain a graphitic carbon, or alloy, anode capable of “insertion” (or intercalation) of Lithium ions. Therefore in Li-ion batteries the host material affords a protective barrier against reactions with a liquid electrolyte.
  • the electrolyte of Li-ion batteries generally contains a non-aqueous electrolyte comprising lithium hexafluorophosphate (LiPF 6 ) dissolved in a mixture of carbonate solvents, examples of which include ethylene carbonate (EC), dimethyl carbonate (DMC), diethyl carbonate (DEC), and propylene carbonate (PC).
  • EC ethylene carbonate
  • DMC dimethyl carbonate
  • DEC diethyl carbonate
  • PC propylene carbonate
  • an electrolyte additive to modify the interface between the electrolyte and the intercalating compound.
  • the additive acts to modify the chemistry and conductivity of a stable Solid Electrolyte Interphase (SEI) that forms between the active electrode and the electrolyte.
  • SEI Solid Electrolyte Interphase
  • Li metal anodes have been a long-standing goal of battery research for decades, but have failed to gain commercial traction.
  • the anode operation comprises at least in part plating deposition of metallic lithium or lithium alloy at the anode.
  • Most batteries of this type involve a conversion cathode such as sulfur (S).
  • Additives are known in the Li—S cell, which act to prevent parasitic reactions (primarily the poly-sulphide shuttle reactions).
  • intercalation/plating cell Yet another class of batteries involves a conventional (“intercalation” or “insertion”) material as a cathode and plating lithium metal at the anode.
  • intercalation/plating cell we will refer to this as an intercalation/plating cell.
  • Coatings may be polymeric, solid-electrolyte, graphene, core-shell, “yolk-shell” or “pomegranate”, depending on the choice of materials.
  • barrier layers to prevent reaction of Li with the electrolyte are also being explored in Li—S batteries.
  • CsPF 6 has been proposed as a means to modify the kinetics of the reaction.
  • LiPF 6 has been the primary salt of Li-ion batteries for decades; however its propensity to form HF, PF 5 , and POF 3 in the presence of trace water impurities is expected to be a major problem for Li-metal batteries (Xu, Kang Nonaqueous Liquid Electrolytes for Lithium-Based Rechargeable Batteries Chem. Rev. 2004, 104, 4303-4417). Fortunately, a variety of other salts are known to reversibly plate and strip lithium metal with less reactivity towards water.
  • lithium bis(oxalato)borate LiBOB
  • lithium tetrafluoroborate LiBF 4
  • lithium bis(trifluoromethanesulfonyl)imide LiTFSI
  • these salts yield coulombic efficiencies as high as 90+% against Li metal, which is far below the 99+% of LiPF 6 in traditional Li-ion (Winter, M.
  • Blends of lithium bis(oxalate)borate and lithium tetrafluoroborate useful substitutes for lithium difluoro(oxalato)borate in electrolytes for lithium metal based secondary batteries? Electrochimica Acta, 2013, 107, 26-32).
  • additives that are either more readily oxidized at the cathode or reduced at the anode than electrolyte salts and solvents.
  • additive mixtures are typically selected so that at least one component is reduced at, and therefore passivates, the anode and another is oxidized at the cathode. This is common practice in the Li-ion industry with commercial cells containing up to 3 or 4 individual low percentage ( ⁇ 2% by mass) additives.
  • Li-ion Cells that Promote Long Lifetime, High Discharge Rate, and Better Safety, JES, 2014, 161, A1261-A1265).
  • lithium salts as electrolyte additives.
  • Non-limiting examples include lithium bis(oxalato)borate or lithium difluoro(oxalato)borate (LiDFOB) (EP 2,660,906 A1, U.S. Pat. No. 7,524,579 B1), and lithium methoxide (LiOMe) (US 2011/0006738 A1).
  • Li-ion (carbonaceous-anode) cells generally utilize additives in fashions that avoid Li metal deposition. For example, one can generate an SEI that alters the rate of electrochemical intercalation and deintercalation of lithium ions to the solid phase of the electrodes (US20110104574 A1, US20150030937 A1), so that the cells can operate at higher C-rates without plating Li metal on the carbon, which is a well-known pitfall of Li-ion batteries.
  • Lithium-Sulfur batteries employing Li metal anodes mainly utilize additives as a means of mitigating the redox-shuttle related to the cathode dissolution and subsequent reduction at the surface of the anode (U.S. Pat. No.
  • rechargeable Li metal batteries generally coat the anode with a thin layer of polymer, ceramic, or both (e.g., lithium phosphorus oxynitride (LiPON)), which serves as a protective barrier for the Li metal surface.
  • LiPON lithium phosphorus oxynitride
  • those practiced in the art have said “because of the enormous challenge involved in stabilizing the Li surface chemically and mechanically through the use of electrolyte additives, the preferred treatment for rechargeable Li-based cells is the use of a solid-electrolyte membrane (US20150050543 A1).”
  • the present invention comprises an electrochemical device containing a metal negative electrode; a positive electrode comprising an electrode active material that reversibly intercalates and de-intercalates lithium cations; a barrier comprising any one of a number of porous polyolefin separators preventing the negative electrode from contacting the positive electrode; and a non-aqueous electrolyte contacting the negative and positive electrodes, comprising at least one lithium salt, one or more organic solvents, and one or more chemical additives.
  • the fluid electrolytes comprising at least one lithium salt, one or more organic solvents, and one or more chemical additives are expected to be suitable for secondary lithium battery systems containing N/P ratio ⁇ 0.9 wherein N/P is defined as the capacity ratio of the negative electrode to positive electrode.
  • the fluid electrolytes comprising at least one lithium salt, one or more organic solvents, and one or more chemical additives are expected to be suitable for secondary lithium battery systems comprising one or more lithium salts comprising at least two of the following elements boron, fluorine, carbon, nitrogen, or oxygen.
  • Preferred embodiments comprise the following lithium salts: lithium tetrafluoroborate (LiBF 4 ), lithium bis(trifluorosulfonyl)imide (LiTFSI), lithium bis(fluorosulfonyl)imide (LiFSI), lithium bis(oxalate)borate (LiBOB), lithium bis(perfluoroethylsulfonyl)imide (LiBETI), lithium dicyanamide (LiDCA), lithium tricyanomethanide (LiTCM), lithium tetracyanoborate (LiTCB), lithium triflate (LiOTf), lithium difluoro(oxalate)borate (LiDFOB), lithium perfluorobutanesulfonate (LiPFBS), lithium thiocyanate (LiSCN), lithium triflinate (LiCF 3 SO 2 ), lithium nitrate (LiNO 3 ), lithium bis(benzenesulfonyl)imide (LiBBI),
  • hexafluorophosphate PF 6 1 ⁇
  • hexafluoroarsenate AsF 6 1 ⁇
  • perchlorate ClO 4 1 ⁇
  • the Li + molarity is in the range from 0.5 M to 2.5 M.
  • the Li molarity is in the range of 0.1 M to 1 M.
  • the Li molarity is in the range of 1 M to 3 M.
  • the Li molarity is in the range of 3 M to 8 M.
  • the solution conductivity is greater than 1 mS/cm at 25 degrees Celsius.
  • a solution Coulombic efficiency is greater than 98% at 25 degrees Celsius.
  • organic solvents are suitable for use in the electrolyte of the present invention.
  • the organic solvents can be used alone or in combination. Whether a solvent comprises a single organic composition or a plurality of organic compositions, for the purposes of further exposition, the organic solvent will be referred to as “the solvent” in the singular.
  • the solvent advantageously should provide appreciable solubility by coordination of the constituent inorganic salts of the electroactive metal.
  • Non-limiting examples of suitable solvents include 1-methyl-3-trifluoromethyl-2-pyrazolin-5-one (MTMP), Bis(2,2,2-trifluoroethyl) ether (BTFE), Tris(2,2,2-trifluoroethyl) phosphite (TTFP), Dimethyl methylphosphonate (DMMP), THF, 2-methyl THF, dimethoxyethane, diglyme, triglyme, tetraglyme, 1,2-diethoxyethane, diethylether, 3-(1,1,2,2-tetrafluoroethoxy)-1,1,2,2-tetrafluoropropane, proglyme, ethyl diglyme, butyl diglyme, ethylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, propylene carbonate, 1,2-Butylene carbonate, bis(2,2,2-trifluoroethyl)carbonate, methyl 2,2,3,3-te
  • additives are appropriate for use in the electrolyte of the present invention. These additives may be used alone or in combination to generate the most beneficial electrolyte solutions.
  • the additives include pyrrolidones, sulfonimides, carbodimides, sulfonylfluorides, fluoroacetates, silanes, cyano-silanes, triflate, organo-borates, nitriles, or isocyanates.
  • suitable additives include 1-ethyl-2-pyrrolidone (NEP), N-fluorobenzenesulfonimide (FBSI), bis(alkyl)- or bis(aryl)carbodiimides, allyl trifluoroacetate, vinyltrimethylsilane, tetra(isocyanato)silane, carbon dioxide, LiBSB, LiOTf, perfluorobutanesulfonyl fluoride (PFBS-F), LiPFBS, lithium vinyltrifluoroborate, aryl nitriles (particularly any of a number of substituted benzonitriles), alkyl- or aryl-isocyanates, examples of which include ethyl-, pentyl-, dodecyl-, and 4-fluorophenyl-isocyanate.
  • NEP 1-ethyl-2-pyrrolidone
  • FBSI N-fluorobenzenesulfonimide
  • FBSI N-flu
  • the invention features a rechargeable electrochemical cell having a non-aqueous fluid electrolyte solution, comprising: a negative electrode comprising lithium metal in part in direct physical contact with the non-aqueous fluid electrolyte; a positive electrode in direct physical contact with the non-aqueous fluid electrolyte; an electronically insulating separator configured to separate the negative electrode and the positive electrode; the non-aqueous fluid electrolyte comprising: at least one organic solvent; at least one electrolytically active, soluble, lithium (Li) salt other than LiPF 6 or LiAsF 6 or LiClO 4 ; and at least one additive from the following: pyrrolidones, sulfonimides, carbodimides, sulfonylfluorides, nitriles, isocyanates, fluoroacetates, silanes, triflate, halides, or organo-borates.
  • At least one electrolytically active lithium salt is selected from the group of salts consisting of lithium bis(perfluoroalkylsulfonyl)imide, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium bis(perfluoroethylsulfonyl)imide, lithium dicyanamide, lithium tricyanomethide, lithium tetracyanoborate, lithium bis(oxalato)borate, lithium difluoro(oxalato)borate, lithium difluoro(malonato)borate, lithium tetrafluoroborate, lithium bis(benzenesulfonyl)imide, lithium triflate, lithium bis(perfluoropinacolato)borate, lithium bis(salicylato)borate, lithium perfluorobutanesulfonate, lithium thiocyanate, lithium triflinate, lithium nitrate.
  • At least one additive is selected from the group of chemicals consisting of bis(trimethylsilyl)carbodiimide, 1-ethyl-2-pyrrolidone, 1-phenylpyrrolidine, N-nitrosopyrrolidine, carbon dioxide, Disuccinimidyl carbonate, N-fluorobenzenesulfonimide, allyl trifluoroacetate, lithium trifluoroacetate, methyl difluoroacetate, ethyl difluoroacetate, Ethyl 4,4,4-trifluoro(aceto)acetate, Methyl 2,2-difluoro-2-(fluorosulfonyl)acetate, vinyltrimethylsilane, tetra(isocyanato)silane, lithium bis(salicylato)borate, lithium triflate, lithium fluoride, Lithium nonafluorobutanesulfonate “nonaflate”, perfluoro-1-butanesulfonyl
  • an anode polarization between electrodeposition and electrodissolution is less than 500 mV at 25 degrees Celsius.
  • the cell Coulombic efficiency is greater than 99.35% at 25 degrees Celsius.
  • the electrolyte solution comprises one or more liquid-infused polymers or gels.
  • the negative electrode and the positive electrode are configured such that a capacity of the negative electrode is strictly less than a capacity of the positive electrode.
  • a ratio of reversible capacity between the negative electrode and the positive electrode is such that Q (negative electrode)/Q (positive electrode) ⁇ 0.9.
  • the rechargeable electrochemical cell is configured to charge to greater than or equal to 4.0 V.
  • the rechargeable electrochemical cell is configured to charge to greater than or equal to 4.3 V.
  • the rechargeable electrochemical cell is configured to discharge to ⁇ 2.5 V.
  • the rechargeable electrochemical cell is configured to charge and discharge at ⁇ 10 C-rate of rated capacity.
  • the rechargeable electrochemical cell is configured to discharge and charge at temperatures in the range of ⁇ 20° C. and 200° C.
  • the rechargeable electrochemical cell is configured to provide at least 80% of initial capacity for greater than 30 charging and discharging cycles.
  • the rechargeable electrochemical cell is wherein the negative electrode is configured to provide >1000 mAh/cc.
  • the active cation is lithium
  • an anode Coulombic efficiency is greater than 99.35% at 25 degrees Celsius.
  • the non-aqueous electrolyte comprises a salt, or combination of salts in a concentration in the range of 0.5 M to saturated.
  • At least one of the negative electrode or positive electrode comprises one of a metal, an alloy, and an intermetallic compound.
  • At least one of the negative electrode or positive electrode comprises a material configured to undergo a reaction selected from the group of reactions consisting of an insertion reaction, an alloying, an intercalation, a disproportionation, a conversion reaction, or a combination thereof.
  • the positive electrode comprises an electroactive material in a solid state, or a liquid state, but not in a gaseous state.
  • the present invention is not directed to lithium-oxygen batteries.
  • a pressure perpendicular to the interface of the positive and negative electrodes is greater than 0.06 MPa.
  • the rechargeable electrochemical cell further comprises at least one gate electrode having a gate electrode electrical terminal, the gate electrode in communication with the non-aqueous fluid electrolyte and permeable to at least one mobile species which is redox-active at at least one of the positive electrode or the negative electrode, the gate electrode situated between the positive electrode and the negative electrode.
  • the rechargeable electrochemical cell comprises lithium metal which is configured to plate onto a negative electrode current collector during charging.
  • the invention relates to a rechargeable electrochemical cell comprising: a negative electrode comprising in direct physical contact with the non-aqueous fluid electrolyte; a positive electrode in direct physical contact with the non-aqueous fluid electrolyte; an electronically insulating separator configured to separate the negative electrode and the positive electrode; and a non-aqueous electrolyte wherein lithium ions are the primary charge carrier comprising: at least one organic solvent; at least one salt comprising at least two of the following elements: boron, fluorine, carbon, nitrogen, or oxygen; and at least one additive from the following: pyrrolidones, sulfonimides, carbodimides, sulfonylfluorides, nitriles, isocyanates, fluoroacetates, silanes, triflate, halides, or organo-borates.
  • At least one electrolytically active lithium salt is selected from the group of salts consisting of lithium bis(perfluoroalkylsulfonyl)imide, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium bis(perfluoroethylsulfonyl)imide, lithium dicyanamide, lithium tricyanomethide, lithium tetracyanoborate, lithium bis(oxalato)borate, lithium difluoro(oxalato)borate, lithium difluoro(malonato)borate, lithium tetrafluoroborate, lithium bis(benzenesulfonyl)imide, lithium triflate, lithium bis(perfluoropinacolato)borate, lithium bis(salicylato)borate, lithium perfluorobutanesulfonate, lithium thiocyanate, lithium triflinate, and lithium nitrate.
  • At least one additive is selected from the group of chemicals consisting of Bis(trimethylsilyl)carbodiimide, 1-ethyl-2-pyrrolidone, 1-phenylpyrrolidine, N-nitrosopyrrolidine, carbon dioxide, Disuccinimidyl carbonate, N-fluorobenzenesulfonimide, allyl trifluoroacetate, lithium trifluoroacetate, methyl difluoroacetate, ethyl difluoroacetate, Ethyl 4,4,4-trifluoro(aceto)acetate, Methyl 2,2-difluoro-2-(fluorosulfonyl)acetate, vinyltrimethylsilane, tetra(isocyanato)silane, lithium bis(salicylato)borate, lithium triflate, lithium fluoride, Lithium nonafluorobutanesulfonate “nonaflate”, perfluoro-1-butanesulfonyl
  • an anode polarization between electrodeposition and electrodissolution is less than 500 mV at 25 degrees Celsius.
  • the cell Coulombic efficiency is greater than 99.35% at 25 degrees Celsius.
  • the electrolyte solution comprises one or more liquid-infused polymers or gels.
  • the negative electrode and the positive electrode are configured such that a capacity of the negative electrode is strictly less than a capacity of the positive electrode.
  • a ratio of reversible capacity between the negative electrode and the positive electrode is such that Q (negative electrode)/Q (positive electrode) ⁇ 0.9.
  • Applicant hereby incorporates by reference the disclosures of co-pending US Patent Application Publication Number 2016-0172660 A1 published Jun. 16, 2016, and US Patent Application Publication Number 2016-0172661 A1 published Jun. 16, 2016, corresponding to U.S. Ser. No. 14/966,100 and U.S. Ser. No. 14/966,392, respectively.
  • the rechargeable electrochemical cell is configured to charge to greater than or equal to 4.0 V.
  • the rechargeable electrochemical cell is configured to charge to greater than or equal to 4.3 V.
  • the rechargeable electrochemical cell is configured to discharge to ⁇ 2.5 V.
  • the rechargeable electrochemical cell is configured to charge and discharge at ⁇ 10 C-rate of rated capacity.
  • the rechargeable electrochemical cell is configured to discharge and charge at temperatures in the range of ⁇ 20° C. and 200° C.
  • the rechargeable electrochemical cell is configured to provide at least 80% of initial capacity for greater than 30 charging and discharging cycles.
  • the negative electrode is configured to provide >1000 mAh/cc.
  • the active cation is lithium
  • an anode Coulombic efficiency is greater than 99.35% at 25 degrees Celsius.
  • the non-aqueous electrolyte comprises a salt, or combination of salts in a concentration in the range of 0.5 M to saturated.
  • At least one of the negative electrode or positive electrode comprises one of a metal, an alloy, and an intermetallic compound.
  • At least one of the negative electrode or positive electrode comprises a material configured to undergo a reaction selected from the group of reactions consisting of an insertion reaction, an alloying, an intercalation, a disproportionation, a conversion reaction, or a combination thereof.
  • a pressure perpendicular to the interface of the positive and negative electrodes is greater than 0.06 MPa.
  • the rechargeable electrochemical cell further comprises at least one gate electrode having a gate electrode electrical terminal, the gate electrode in communication with the non-aqueous fluid electrolyte and permeable to at least one mobile species which is redox-active at at least one of the positive electrode or the negative electrode, the gate electrode situated between the positive electrode and the negative electrode.
  • the rechargeable electrochemical cell comprises lithium metal which is configured to plate onto a negative electrode current collector during charging.
  • FIG. 1 depicts charge (curve 104) and discharge (curve 102) voltage vs. percent of rated capacity for cycle 1 (black) and charge (curve 106) and discharge (curve 108) voltage vs. percent of rated capacity for cycle 60 (grey) of cells containing lithium transition metal oxide cathode, a lithium metal anode, and an 0.85 M lithium bis(oxalato)borate in EC:DMC 1:2 (v/v) electrolyte.
  • FIG. 2 depicts charge (curve 204) and discharge (curve 202) voltage vs. percent of rated capacity for cycle 1 (black) and charge (curve 206) and discharge (curve 208) voltage vs. percent of rated capacity for cycle 60 (grey) of cells containing lithium transition metal oxide cathode, a lithium metal anode, and an 0.85 M lithium bis(oxalato)borate+with 1 wt % dodecyl isocyanate additive in EC:DMC 1:2 (v/v) electrolyte.
  • FIG. 3 shows the number of charge-discharge cycles to 50% rated capacity for 1 M LiPF 6 in EC:DMC 1:2 (v/v) (bar 302) as compared to 0.85 M LiBOB in EC:DMC 1:2 (v/v) (bar 304), and 0.85 M LiBOB+1 wt % dodecyl isocyanate in EC:DMC 1:2 (v/v) (bar 306) under the same cycling conditions in cells containing a lithium transition metal oxide cathode and a lithium metal anode.
  • the embodiments herein provide new electrolyte solvents or additives that enable reversible deposition and dissolution of lithium metal for many charge-discharge cycles.
  • the additive containing non-aqueous electrolytes also provide benefit in terms of ability to maintain cycle life higher rates of charge and discharge, or in terms of reduced impedance, or reduced volume of gas evolved due to parasitic reactions.
  • the embodiments herein describe chemical compounds, which, when used either as bulk electrolyte solvents or co-solvents, or as additives in low concentrations, can form passivation layers on either the anode or cathode surface or both.
  • Electrolyte solutions are formulated from the salts, solvents, and additives mentioned herein.
  • the lithium metal batteries that can be fabricated using the aforementioned electrolytes are commercially viable.
  • solvent systems that are expected to be suitable for secondary lithium metal battery electrolytes.
  • These solvent systems contain one or more chemicals from the following classes: ethers, fluoro-ethers, organic carbonates, carbonate esters, sulfoxides, sulfites, sulfones, nitriles, alkanes, dioxanes, phosphates, aliphatic and aromatic hydrocarbon solvents or ionic liquids.
  • Non-limiting examples of the electrolyte solvent or solvents include the following: THF, 2-methyl THF, dimethoxyethane, diglyme, triglyme, tetraglyme, 1,2-diethoxyethane, diethylether, 3-(1,1,2,2-tetrafluoroethoxy)-1,1,2,2-tetrafluoropropane, proglyme, ethyl diglyme, butyl diglyme, ethyl acetate (EA), ethylene carbonate (EC), 1,2-Butylene carbonate (BC), dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), propylene carbonate (PC), fluoro-ethylene carbonate (FEC), bis(2,2,2-trifluoroethyl)carbonate, methyl 2,2,3,3-tetrafluoropropyl carbonate, dimethylsulfoxide, dimethylsulfite, sulfolane,
  • At least one component of the electrolyte solvent is a cyclic carbonate.
  • At least one component of the electrolyte solvent is ethylene carbonate.
  • ethylene carbonate comprises greater than or equal to 33% by volume of the electrolyte solvent mixture.
  • At least one other component of the electrolyte solvent mixture is chosen from the remaining solvents listed herein.
  • the second component is either an acyclic carbonate or ether molecule.
  • the second component is DMC, EMC, DEC, PC, bis(2,2,2-trifluoroethyl)carbonate, methyl 2,2,3,3-tetrafluoropropyl carbonate, ethyl diglyme or 3-(1,1,2,2-tetrafluoroethoxy)-1,1,2,2-tetrafluoropropane, comprising less than or equal to 67% by volume of the electrolyte solvent mixture.
  • the example fluid electrolytes that are expected to be suitable for secondary lithium battery systems contain one or more lithium salts comprising at least two of the following elements boron, fluorine, carbon, nitrogen, or oxygen.
  • materials contemplated for use in the electrolytes of the invention can be described by the general formula LiA, where A is a polyatomic monovalent negative ion.
  • Non-limiting examples of polyatomic monovalent anions, A, that are believed to be useful in practicing the invention include, but are not limited to, those described in Table I, and mixtures thereof
  • the example fluid electrolytes that are expected to be suitable for secondary lithium battery systems contain N/P ratio ⁇ 0.9.
  • Additives are included in the electrolyte either unaccompanied or in combination and are selected from the following groups: pyrrolidones, sulfonimides, carbodiimides, acetates, vinyl-substituted compounds, sulfonyl fluorides, aryl nitriles, aryl- or alkyl-isocyanates, carbon dioxide, or lithium salts.
  • individual additives or combinations thereof are chosen from those listed in Table II and comprise between 0 and 10 wt % of the total electrolyte mass.
  • the electrolyte solution is prepared in an environment that is moisture- and oxygen-free by dissolving one lithium salt or a combination of lithium salts selected from Table I in a mixture that is one part EC and two parts DMC by volume.
  • the total concentration of lithium cations should occur in the range of 0.25 M to 5 M.
  • a single additive or combination of additives is selected from Table II and dissolved in the electrolyte solution between 0 and 10 wt %. Dissolution occurs within 1-2 hours and the electrolyte may or may not be filtered prior to use.
  • Intercalation cathodes used in conjunction with the electrolyte according to the present invention preferably include transition metal oxides, transition metal oxo-anions, chalcogenides, and halogenides and combinations thereof.
  • positive electrode active material for the rechargeable Li metal anode battery include Chevrel phase Mo 6 S 8 , MnO 2 , CuS, Cu 2 S, Ag 2 S, CrS 2 , VOPO 4 , layered structure compounds such as TiS 2 , V 2 O 5 , MgVO 3 , MoS 2 , MgV 2 O 5 , MoO 3 , Spinel structured compounds such as CuCr 2 S 4 , MgCr 2 S 4 , MgMn 2 O 4 , MgNiMnO 4 , Mg 2 MnO 4 , NASICON structured compounds such as MgFe 2 (PO 4 ) 3 and MgV 2 (PO 4 ) 3 , Olivine structured compounds such as MgMnSiO 4 and MgF
  • Non-limiting examples of positive electrode active materials for the rechargeable Li metal anode battery include lithium transition metal oxides comprised of one or more transition metals and one or more redox active transition metals such as Lithium Cobalt Oxide, Lithium Nickel Managnese Cobalt Oxide, and Lithium Nickel Cobalt Aluminum Oxide compositions.
  • Non-limiting examples of positive electrode active materials for the Li battery include Lithium metal phosphates and tavorites such as LiFePO 4 , Lithium metal oxide spinels LiMn 2 O 4 , and Li NASICON's Li 3 V 2 (PO 4 ) 3 .
  • the focus of this invention excludes the use of air, or oxygen cathodes due to chemical incompatibility of the non-aqueous electrolyte solutions disclosed herein as well as the inherent voltage, and hence energy, limitation of such systems.
  • the present invention is not directed to lithium-oxygen batteries.
  • the positive electrode layer further comprises an electronically conductive additive.
  • electronically conductive additives include carbon black, Super P®, C-NERGY Super C65, Ensaco® black, Ketjenblack®, acetylene black, synthetic graphite such as Timrex® SFG-6, Timrex® SFG-15, Timrex® SFG-44, Timrex® KS-6, Timrex® KS-15, Timrex® KS-44, natural flake graphite, graphene, carbon nanotubes, fullerenes, hard carbon, or mesocarbon microbeads.
  • the positive electrode layer further comprises a polymer binder.
  • polymer binders include poly-vinylidene fluoride (PVdF), poly(vinylidene fluoride-co-hexafluoropropene) (PVdF-HFP), Polytetrafluoroethylene (PTFE), Kynar Flex® 2801, Kynar® Powerflex LBG, and Kynar® HSV 900, or Teflon®.
  • Negative electrodes used in conjunction with the present invention comprise a negative electrode active material that can accept Li-ions into the metallic form.
  • Non-limiting examples of negative electrode active material for the rechargeable Li metal anode battery include Li, Li alloys such as Si, Sn, Bi, Al, Li4Ti5O12, hard carbon, Cu, graphitic carbon, amorphous carbon.
  • the negative electrode layer further comprises an electronically conductive additive.
  • electronically conductive additives include carbon black, Super P®, C-NERGY Super C65, Ensaco® black, Ketjenblack®, acetylene black, synthetic graphite such as Timrex® SFG-6, Timrex® SFG-15, Timrex® SFG-44, Timrex® KS-6, Timrex® KS-15, Timrex® KS-44, natural flake graphite, carbon nanotubes, fullerenes, hard carbon, or mesocarbon microbeads.
  • the negative electrode layer further comprises a polymer binder.
  • polymer binders include poly-vinylidene fluoride (PVdF), poly(vinylidene fluoride-co-hexafluoropropene) (PVdF-HFP), Polytetrafluoroethylene (PTFE), Kynar Flex® 2801, Kynar® Powerflex LBG, and Kynar® HSV 900, or Teflon®.
  • the positive and negative electrodes are separated by a porous separator comprising a polyolefin, ceramic, or composite thereof, which is ionically conductive, yet electronically resistive,
  • a porous separator comprising a polyolefin, ceramic, or composite thereof, which is ionically conductive, yet electronically resistive
  • materials comprising separators include polypropylene (PP), polyethylene (PE), aluminum oxide (Al 2 O 3 ), and poly-vinylidene fluoride (PVdF).
  • the rechargeable Li metal anode battery used in conjunction with the electrolyte described herein comprises a positive electrode current collector comprising carbonaceous material, or a current collector comprising a metal substrate coated with an over-layer to prevent corrosion in the electrolyte.
  • the rechargeable Li metal battery described herein comprises a negative electrode current collector comprising any material capable of sufficiently conducting electrons.
  • the rechargeable Li metal battery described herein comprises positive and negative electrode current collectors comprising any material capable of sufficiently conducting electrons.
  • the rechargeable Li metal battery disclosed herein is a button or coin cell battery comprising a stack of negative electrode, porous polyolefin or glass fiber separator, and positive electrode disks sit in a can base onto which the can lid is crimped.
  • the rechargeable Li metal battery used in conjunction with the electrolyte disclosed herein is a stacked cell battery.
  • the rechargeable Li metal battery disclosed herein is a prismatic, or pouch, cell comprising one or more stacks of negative electrode, porous polyolefin or glass fiber separator, and positive electrode sandwiched between current collectors wherein one or both current collectors comprise a metal, carbonaceous materials, or a metal substrate coated with an over-layer to prevent corrosion in the electrolyte.
  • the stack(s) are folded within a polymer coated aluminum foil pouch, vacuum and heat dried, filled with electrolyte, and vacuum and heat sealed.
  • the rechargeable Li metal battery disclosed herein is a prismatic, or pouch, bi-cell comprising one or more stacks of a positive electrode, which is coated with active material on both sides and wrapped in porous polypropylene or glass fiber separator, and a negative electrode folded around the positive electrode wherein one or both current collectors a metal, carbonaceous materials, or a metal substrate coated with an over-layer to prevent corrosion in the electrolyte.
  • the stack(s) are folded within a polymer coated aluminum foil pouch, dried under heat and/or vacuum, filled with electrolyte, and vacuum and heat sealed.
  • an additional tab composed of a metal foil or carbonaceous material of the same kind as current collectors described herein, is affixed to the current collector by laser, resistance, or ultrasonic welding, adhesive, or mechanical contact, in order to connect the electrodes to the device outside the packaging.
  • the rechargeable Li metal battery used in conjunction with the electrolyte disclosed herein is a wound or cylindrical cell comprising wound layers of one or more stacks of a positive electrode which is coated with active material on one or both sides, sandwiched between layers of porous polypropylene or glass fiber separator, and a negative electrode wherein one or both current collectors a metal, carbonaceous materials, or a metal substrate coated with an over-layer to prevent corrosion in the electrolyte.
  • the stack(s) are wound into cylindrical roll, inserted into the can, dried under heat and/or vacuum, filled with electrolyte, and vacuum and crimped, or welded shut.
  • an additional tab composed of a metal foil or conducting material of the same kind as current collectors described herein, is affixed to the current collector by laser, resistance, or ultrasonic welding, adhesive, or mechanical contact, in order to connect the electrodes to an external circuit outside the packaging.
  • the rechargeable Li metal battery comprises a positive electrode terminal, a negative electrode terminal, and at least one additional (i.e., 3 rd ) terminal capable of acting as a simple reference electrode for monitoring resistance, passive voltage, temperature, pressure, an active gate electrode for controlling voltage, current, resistance, or a lithium reservoir electrode for replacing depleted lithium.
  • FIG. 1 depicts voltage vs. percent of rated capacity for cycle 1 (black) and cycle 60 (grey) of cells containing lithium transition metal oxide cathode, a lithium metal anode, and an 0.85 M lithium bis(oxalato)borate in EC:DMC 1:2 (v/v) electrolyte.
  • This is a zero excess lithium cell (i.e., N/P ⁇ 1, all the lithium in the as built cell resides in the cathode.)
  • FIG. 2 depicts voltage vs.
  • Cycle 1 black and cycle 60 (grey) of cells containing lithium transition metal oxide cathode, a lithium metal anode, and an 0.85 M lithium bis(oxalato)borate with an additive comprising 1 wt % dodecyl isocyanate dissolved in EC:DMC 1:2 (v/v) electrolyte.
  • This is a zero excess lithium cell (i.e., N/P ⁇ 1, all the lithium in the as built cell resides in the cathode.)
  • the cell cycled at room temperature utilizing constant current discharge at one C-rate to 100% depth of discharge.
  • electrolyte additives to a rechargeable lithium metal cell comprising a lithium intercalation cathode, lithium anode, and separator electronically isolating the electrodes from one another, can improve the character of the cell performance by at least one of the following means: enhancing the mobility of lithium ions, enhancing the kinetics of lithium ion de-solvation, so as mitigate parasitic reduction of other electrolyte components, and/or be consumed at either or both electrode-electrolyte interfaces enhancing the stability of the interface while facilitating transport of lithium ions to and fro the surface.
  • FIG. 3 depicts the number of charge-discharge cycles to 50% rated capacity for each of the three cells.
  • the electrolyte in one cell comprises 1 M LiPF 6 in EC:DMC 1:2 (v/v) while the electrolyte in the second cell comprises 0.85 M LiBOB in EC:DMC 1:2 (v/v), and the third cell comprises 0.85 M LiBOB and an additive 1 wt % dodecyl isocyanate in EC:DMC 1:2 (v/v).
  • the 1M LiPF 6 in EC:DMC 1:2 (v/v) requires only 10 cycles to fade down to 50% capacity while the electrolyte comprised of 0.85 M LiBOB in EC:DMC 1:2 (v/v) enables 50% capacity retention at cycle 36, and additive containing electrolyte, namely 0.85 M LiBOB and an additive 1 wt % dodecyl isocyanate in EC:DMC 1:2 (v/v) reaches the 50% capacity retention mark at 62 cycles.
  • the cells comprising electrolytes that contain one or more lithium salts comprising at least two of the following elements boron, fluorine, carbon, nitrogen, or oxygen suffer significantly less capacity fade that the cell with an electrolyte comprised of LiPF 6 lithium salt.
  • the electrolyte comprised of an additive disclosed herein, 1 wt % dodecyl isocyanate, and one or more lithium salts comprising at least two of the following elements boron, fluorine, carbon, nitrogen, or oxygen provides surprisingly high cycle life in a zero excess rechargeable lithium cell.
  • 250 mAh cells comprised of a lithium transition metal oxide cathode, a lithium metal anode, a non-aqueous fluid electrolyte from Table III and an porous, electronically resistive separator were repeatedly cycled at room temperature utilizing constant current discharge at one C-rate to 100% depth of discharge and a charge rate of 0.5 C-rate to 100% depth of charge.
  • the percent increase in cycle life at 70% capacity retention relative to an additive free non-aqueous electrolyte solution comprising LiBF 2 (C 2 O 4 ) dissolved in carbonate solvents cycled with the same components and cycling regime is presented in TABLE III.
  • test group A1 about 3% increase in the number of cycles to achieve 70% capacity retention is shown,
  • test group B1 and C1 there is about 2% and 1% increase in the number of cycles to achieve 70% capacity retention relative to the additive free non-aqueous electrolyte composition.
  • Non-aqueous electrolytes comprising additives and formulations disclosed herein were prepared as shown in TABLE IV and added to “LiPo” style cells comprised of a lithium cobalt oxide cathode at 15 mg/cm2 aerial loading (250 mAh cell overall), a lithium metal anode as plated upon Cu-based current collector, and an porous, electronically resistive separator.
  • the cells were formed at low rate, then cycled aggressively on a 3 hour total time cycle (about 2 hours to charge, and 1 hour to discharge). This was conducted at temperature of 28 degrees Celcius and 100% depth-of-discharge in order to elucidate improvements in Coulombic efficiency.
  • TABLE IV depicts the results for the Coulombic efficiency as measure in the 5 th cycle.
  • the additive containing formulations provide for at least 96% Coulombic efficiency, and in the majority of cases the 5 th cycle Coulobic efficiency increases to at least 98%.
  • the class of fluoroacetates typically provide for at least about 98% Coulombic efficiency (e.g., MDFSA, LiTFA, MDFA).
  • the chlrosulfonyl isocyanate provides for 98.21% efficiency
  • NSP provides for greater than 97% efficiency during aggressive cycling.
  • any reference to “secondary” or “rechargeable” cell is understood to refer to an electrochemical cell capable of undergoing repeated charge and discharge cycles.
  • any reference to “capacity” is understood to refer to amp-hours provided by the cell or device under normal operating conditions.
  • non-aqueous fluid electrolyte refers to a non-aqueous liquid electrolyte and not to a molten salt, gel, or dry, solid polymer electrolyte.
  • any reference to “additive” is understood to refer to a constituent of a non-aqueous liquid electrolyte, and not to a molten salt, gel, or polymer electrolyte, that comprises ⁇ 10% by mass (wt %) of the non-aqueous fluid electrolyte.
  • any reference to “current collector” is understood to refer to any material capable of sufficiently conducting electrons.
  • any reference to an electronic signal or an electromagnetic signal is to be understood as referring to a non-volatile electronic signal or a non-volatile electromagnetic signal.
  • any reference to “record” or “recording” is understood to refer to a non-volatile or non-transitory record or a non-volatile or non-transitory recording.
  • Recording the results from an operation or data acquisition for example, recording results such as an electrical signal having a particular frequency or wavelength, or recording an image or a portion thereof, is understood to mean and is defined herein as writing output data in a non-volatile or non-transitory manner to a storage element, to a machine-readable storage medium, or to a storage device.
  • Non-volatile or non-transitory machine-readable storage media that can be used in the invention include electronic, magnetic and/or optical storage media, such as magnetic floppy disks and hard disks; a DVD drive, a CD drive that in some embodiments can employ DVD disks, any of CD-ROM disks (i.e., read-only optical storage disks), CD-R disks (i.e., write-once, read-many optical storage disks), and CD-RW disks (i.e., rewriteable optical storage disks); and electronic storage media, such as RAM, ROM, EPROM, Compact Flash cards, PCMCIA cards, or alternatively SD or SDIO memory; and the electronic components (e.g., floppy disk drive, DVD drive, CD/CD-R/CD-RW drive, or Compact Flash/PCMCIA/SD adapter) that accommodate and read from and/or write to the storage media.
  • electronic storage media such as RAM, ROM, EPROM, Compact Flash cards, PCMCIA cards, or alternatively SD or SD

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