EP3214207A1 - Verfahren zur herstellung von antimonnanodrähten - Google Patents

Verfahren zur herstellung von antimonnanodrähten Download PDF

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Publication number
EP3214207A1
EP3214207A1 EP16157979.2A EP16157979A EP3214207A1 EP 3214207 A1 EP3214207 A1 EP 3214207A1 EP 16157979 A EP16157979 A EP 16157979A EP 3214207 A1 EP3214207 A1 EP 3214207A1
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EP
European Patent Office
Prior art keywords
antimony
range
solution
gallium
nanowires
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English (en)
French (fr)
Inventor
Heino Sommer
Rihab AL-SALMAN
Torsten Brezesinski
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BASF SE
Karlsruher Institut fuer Technologie KIT
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BASF SE
Karlsruher Institut fuer Technologie KIT
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Priority to EP16157979.2A priority Critical patent/EP3214207A1/de
Publication of EP3214207A1 publication Critical patent/EP3214207A1/de
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/66—Electroplating: Baths therefor from melts
    • C25D3/665—Electroplating: Baths therefor from melts from ionic liquids
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/54—Electroplating: Baths therefor from solutions of metals not provided for in groups C25D3/04 - C25D3/50
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D1/00—Electroforming
    • C25D1/006—Nanostructures, e.g. using aluminium anodic oxidation templates [AAO]
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D1/00—Electroforming
    • C25D1/04—Wires; Strips; Foils

Definitions

  • the present invention relates to a process for producing antimony nanowires comprising at least the process step of electrochemically depositing antimony directly onto at least one surface of an electrode from a solution comprising at least one antimony compound (A), at least one gallium compound (B) and at least one ionic liquid (C).
  • High quality Sb nanostructures are normally synthesized by vacuum techniques like CVD [ Gopal Sapkota and U Philipose, Semicond. Sci. Technol., 29 (2014) 035001 ] or by focused ion beam induced synthesis [ Ch. Schoendorfer, A. Lugstein, Y.-J. Hyun, E. Bertagnolli, L. Bischoff, P. M. Nellen, V. Callegari and P. Pongratz, J. Appl. Phys., 102 (2007) 044308 ]. However, these methods are considered to be high-cost techniques.
  • WO 2012/170311 discloses a method of making metal nanoneedles on the surface of a substrate material via electrodeposition.
  • the SEM images of the nanoneedles show needles with an uneven surface and also needles being tapered along the axis.
  • WO 2013/052456 describes a method for producing nanostructured materials such as silicon nanowires and their application as anode component for lithium ion batteries. The preparation of antimony nanowires is experimentally not disclosed.
  • WO 2015/071189 discloses a process for producing tin nanowires by electrochemically depositing tin directly onto at least one surface of an electrode from a solution comprising at least one tin compound (A) such as SnCl 4 , at least one silicon compound (B) such as SiCl 4 and at least one ionic liquid (C). Conditions for the preparation of antimony nanowires are not disclosed.
  • A tin compound
  • B silicon compound
  • C ionic liquid
  • the object was to find a flexible and more efficient synthesis route to antimony nanowires which are useful in different applications as anode material in lithium ion batteries.
  • the object was to avoid the use of any template which has to be removed after formation of the antimony nanowires.
  • This object is achieved by a process for producing antimony nanowires having a thickness in the range from 10 nm to 300 nm comprising at least the process step of
  • the antimony nanowires obtainable or obtained by the inventive process are preferably crystalline.
  • the thickness of antimony nanowires obtainable or obtained by the inventive process is in the range from 10 nm to 300 nm, preferably in the range from 20 nm to 150 nm, in particular in the range from 30 nm to 60 nm.
  • the antimony nanowires consist essentially of antimony, that means that the antimony-content of the antimony nanowires is preferably at least 90 %, more preferably in the range of from 95 % to 100 %, in particular from 97 % to 100 % by weight based on the total weight of the antimony nanowires.
  • the length of the antimony nanowires can be varied depending on the reaction conditions. Antimony is electrochemically deposited onto at least one surface of an electrode. In particular the length of the antimony nanowires depends on e.g. the time antimony is electrochemically deposited onto the at least one surface of an electrode.
  • the antimony nanowires show an aspect ratio of at least 50, more preferably an aspect ratio in the range from 75 to 1000, in particular in the range from 100 to 200.
  • the length, the thickness, the aspect ratio or the morphological arrangement of the antimony nanowires obtained by the inventive process can be determined from the SEM images of the corresponding samples.
  • antimony nanowires are directly electrochemically deposited onto at least one surface of an electrode from a solution comprising at least one antimony compound (A), at least one gallium compound (B) selected from the group consisting of gallium(III) halides and organo gallium halides and at least one ionic liquid (C).
  • the solution from which antimony nanowires are electrochemically deposited comprises at least one antimony compound (A), also referred to hereinafter as component (A) for short.
  • the antimony of component (A) is usually in the oxidation state +3 or +5, preferably in the oxidation state +3.
  • Component (A) is preferably at least partly, preferably completely soluble in the formed solution.
  • antimony compounds (A) in the oxidation state +3 are antimony (III) halides like, SbCl 3 and SbBr 3 .
  • antimony compounds (A) in the oxidation state +5 are antimony (V) halides like SbF 5 or SbCl 5
  • antimony compounds (A) instead of using a single antimony compound (A) it is also possible to use two or more different antimony compounds (A) in the solution including mixtures of at least two antimony compounds (A) in the oxidation state +3, mixtures of at least two antimony compounds (A) in the oxidation state +5 or mixtures of at least one antimony compounds (A) in the oxidation state +3 and at least one antimony compounds (A) in the oxidation state +5.
  • Preferred antimony compounds (A) are antimony (III), in particular antimony trichloride.
  • the inventive process is characterized in that the antimony compound (A) is antimony trichloride
  • the concentration of component (A) in the solution can be varied in a wide range depending on the solubility of component (A) in the solution.
  • concentration of component (A) in the solution is in the range from 0.1 M to 1.0 M, more preferably in the range from 0.2 M to 0.8 M, in particular in the range from 0.3 M to 0.6 M.
  • the solution from which antimony nanowires are electrochemically deposited comprises further at least one gallium compound selected from the group consisting of gallium(III) halides and organo gallium halides, also referred to hereinafter as component (B) for short.
  • the gallium of component (B) is usually in the oxidation state +3.
  • Component (B) is preferably at least partly, more preferably completely soluble in the formed solution.
  • gallium compounds (B) selected from the group consisting of gallium(III) halides and organo gallium(III) halides are GaF 3 , GaCl 3 , GaBr 3 , Gal 3 , GaCl 2 Me, GaClMe 2 , GaBr 2 Me, GaBrMe 2 , GaBr 2 Ph or GaBrPh 2 .
  • Preferred gallium compounds (B) are gallium(III) halides, in particular gallium trichloride.
  • the inventive process is characterized in that the gallium compound (B) is gallium trichloride.
  • the inventive process is characterized in that either the antimony compound (A) or the gallium compound (B) is a trihalide, in particular a trichloride.
  • the electrochemical deposition of antimony from a solution comprising only one antimony compound (A) and an ionic liquid (C) and no gallium compound (B) results in dendritic growth of metallic antimony with granular morphology, while antimony nanowires are formed by the electrochemical deposition of antimony from a solution comprising component (A), component (B) and at least one ionic liquid (C), wherein the concentration of the gallium compound (B) in the solution is in the range from 0.05 M to 1 M, preferably in the range from 0.075 M to 0.2 M, more preferably in the range from 0.09 M to 0.15 M.
  • the inventive process is characterized in that the concentration of the gallium compound (B) in the solution is in the range from 0.09 M to 0.15 M.
  • the molar ratio of antimony to gallium in the solution can be varied in a wide range.
  • the molar ratio of antimony to gallium in the solution is in the range from 20 to 0.1, preferably in range from 15 to 0.5, more preferably in the range from 10 to 1, in particular in the range from 7 to 2.
  • the inventive process is characterized in that the molar ratio of antimony to gallium in the solution is in the range from 7 to 2.
  • the solution, from which antimony nanowires are electrochemically deposited comprises further at least one ionic liquid (C), also referred to hereinafter as component (C) for short.
  • Ionic liquids (C) are known to the person skilled in the art. Several ionic liquids, which are liquid salts with a melting point below 100 °C, in particular below room temperature, are commercially available or can be prepared according to known protocols. The ionic liquid (C) can be varied in a wide range as long as component (C) is liquid at the temperature of the deposition and dissolves the components (A) and (B) sufficiently and does not chemically react with them. In addition the ions of the ionic liquid (C) preferably do not react under the conditions of the electrochemical deposition.
  • Preferred examples of ionic liquids (C) are 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl) imide (BMP-TFSI), 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (EM-Im-TFSI) and 1-butyl-1-methylpyrrolidinium triflate (BMP-TFO).
  • BMP-TFSI 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl) imide
  • EM-Im-TFSI 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide
  • BMP-TFO 1-butyl-1-methylpyrrolidinium triflate
  • the inventive process is characterized in that the ionic liquid (C) is selected from the group consisting of 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl) imide (BMP-TFSI), 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (EMIm-TFSI) and 1-butyl-1-methylpyrrolidinium triflate (BMP-TFO), preferably BMP-TFSI.
  • BMP-TFSI 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl) imide
  • EMIm-TFSI 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide
  • BMP-TFO 1-butyl-1-methylpyrrolidinium triflate
  • the solution might comprise further components, which are inert under the conditions of the electrochemical deposition reaction like polar aprotic solvents which are usually used in electrolytes of electrochemical cell.
  • the solution is essentially free of water, i.e. the water content in the solution is below 0.1 % by weight, preferably below 500 ppm, in particular in the range from 0.1 ppm to 10 ppm.
  • component C for example as technical grade, comprises more water than desired
  • the water can be removed by known methods, like stripping the water from component A by heating it under reduced pressure, or by adding drying reagents like molecular sieves or by adding scavengers like aluminum alkyls, magnesium alkyls or lithium alkyls. It is also possible to remove excess water by adding additional amount of antimony trichloride or gallium trichloride, which form insoluble compounds by reacting with water.
  • the sum of the weight of all components (A), (B) and (C) is at least 90% by weight, preferably in the range from 95% to 100% by weight, in particular in the range from 98% to 100% by weight based on the total weight of the solution.
  • the organic solvent (D) is a polar aprotic solvent, more preferably a polar aprotic solvent selected from the group consisting of cyclic carbonates, in particular propylene carbonate, ethylene carbonate and fluoroethylene carbonate, acetonitrile, dimethylformamide, tetrahydrofurane, acetone and dimethyl sulfoxide.
  • a polar aprotic solvent selected from the group consisting of cyclic carbonates, in particular propylene carbonate, ethylene carbonate and fluoroethylene carbonate, acetonitrile, dimethylformamide, tetrahydrofurane, acetone and dimethyl sulfoxide.
  • the inventive process is characterized in that the solution comprises at least one organic solvent (D), preferably at least one polar aprotic solvent (D), more preferably a polar aprotic solvent selected from the group consisting of cyclic carbonates, in particular propylene carbonate, ethylene carbonate and fluoroethylene carbonate, acetonitrile, dimethylformamide, tetrahydrofurane, acetone and dimethyl sulfoxide.
  • D organic solvent
  • D polar aprotic solvent
  • the concentration of component (C) in the solution which comprises beside component (A) and component (B) also component (D), can be varied in a wide range.
  • concentration of all ionic liquids (C) in the solution is at least 0.05 M, more preferably at least 0.1 M, in particular at least 0.2 M up to the maximal concentration of the sum of all ionic liquids (C) in a solution comprising no organic solvent (D).
  • the inventive process is characterized in that the concentration of all ionic liquids (C) in the solution is at least 0.05 M, more preferably at least 0.1 M, in particular at least 0.2 M up to the maximal concentration of the sum of all ionic liquids (C) in a solution comprising no organic solvent (D).
  • the inventive process is characterized in that the solution comprises at least one organic solvent (D), preferably at least one polar aprotic solvent (D), more preferably a polar aprotic solvent selected from the group consisting of cyclic carbonates, in particular propylene carbonate, ethylene carbonate and fluoroethylene carbonate, acetonitrile, dimethylformamide, tetrahydrofurane, acetone and dimethyl sulfoxide, and wherein the concentration of all ionic liquids (C) in the solution is at least 0.05 M, more preferably at least 0.1 M, in particular at least 0.2 M up to the maximal concentration of the sum of all ionic liquids (C) in a solution comprising no organic solvent (D).
  • the concentration of all ionic liquids (C) in the solution is at least 0.05 M, more preferably at least 0.1 M, in particular at least 0.2 M up to the maximal concentration of the sum of all ionic liquids (C) in a solution comprising no organic solvent (D).
  • the solution used in process step a) is usually prepared by simply mixing the components (A), (B) and (C) preferably under inert and dry, i.e. water-free, conditions, using Schlenk technique or working in a glove-box.
  • the electrochemical deposition can be take place in a wide temperature range.
  • process step (a) takes place at a temperature in the range from 0 °C to 100 °C, more preferably in the range from 15 °C to 50 °C, in particular in the range from 20 °C to 35 °C.
  • the inventive process is characterized in that process step (a) takes place at a temperature in the range from 15 °C to 50 °C, in particular in the range from 20 °C to 35 °C.
  • the time of electrochemically depositing antimony can be varied in a broad range and is preferably adjusted to the desired length of the antimony nanowires deposited.
  • the electrochemical deposition can be take place in a wide range of deposit potentials which are given by reference to a Pt quasi-reference electrode.
  • process step (a) takes place at a deposit potential in the range from -1.9 V to - 2.5 V vs. Pt quasi-reference electrode.
  • the inventive process is characterized in that process step (a) takes place at a deposit potential in the range from -1.9 V to - 2.5 V vs. Pt quasi-reference electrode.
  • the surface of the electrode and the solution can be static to each other or the solution is in motion relative to the surface of the electrode, e.g. by simply stirring the solution or by continuously supplying the surface of the electrode with new solution using a pump around system.
  • the surface of the electrode, where the antimony nanowires are deposited during the electrochemical deposition can be selected from a large number of electrically conductive materials like metals and conductive carbons.
  • the electrochemical deposition of the antimony nanowire takes place on the surface of an electrode, wherein the surface is composed of glassy carbon.
  • the inventive process is characterized in that the surface of the electrode, where the antimony nanowires are deposited, is composed of glassy carbon.
  • Antimony nanowires with an aspect ratio in the range from 100 to 200 and a high number of nanowires per electrode area are preferably obtained in process step a) of the inventive process under conditions wherein the antimony compound (A) is antimony trichloride, wherein the concentration of antimony trichloride in the solution is in the range from 0.2 M to 0.7 M, in particular in the range from 0.3 to 0.6 M, and the gallium compound (B) is gallium trichloride, wherein the concentration of gallium trichloride in the solution is in the range from 0.075 M to 0.2 M, in particular in the range from 0.09 M to 0.15 M, and wherein process step (a) takes place at a temperature in the range from 15 °C to 50 °C, preferably 25 °C to 35 °C, and at a deposit potential in the range from -1.9 V to - 2.5 V vs. Pt quasi-reference electrode.
  • the inventive process is characterized in that the antimony compound (A) is antimony trichloride, wherein the concentration of antimony trichloride in the solution is in the range from 0.2 to 0.7 M, and the gallium compound (B) is gallium trichloride, wherein the concentration of gallium trichloride in the solution is in the range from 0.075 M to 0.2 M, and wherein process step (a) takes place at a temperature in the range from 15 °C to 50 °C and at a deposition potential in the range from -1.9 V to - 2.5 V vs. Pt quasi-reference electrode.
  • the inventive process is characterized in that for the first time no templates are needed during the electrochemical synthesis and pulsed electrochemical deposition can be avoided and the deposition can be performed at room temperature in one-step process.
  • the antimony nanowires obtained in process step a) of the inventive process are usually isolated by separation them mechanically from the surface of the electrode, for example by cutting.
  • the isolated antimony nanowires can be used in different applications e.g. in electronics and gas sensor applications.
  • the present invention further also provides antimony nanowires having a thickness in the range from 10 nm to 300 nm, preferably in the range from 20 nm to 150 nm, in particular in the range from 30 nm to 60 nm, and preferably having an aspect ratio of at least 50, more preferably an aspect ratio in the range from 75 to 1000, in particular in the range from 100 to 200 obtainable by a process for producing antimony nanowires as described above.
  • This process comprises the above-described process step (a) especially also with regard to preferred embodiments thereof.
  • the present invention likewise also provides antimony nanowires having a thickness in the range from 10 nm to 300 nm, preferably in the range from 20 nm to 150 nm, in particular in the range from 30 nm to 60 nm, and preferably having an aspect ratio of least 50, more preferably an aspect ratio in the range from 75 to 1000, in particular in the range from 100 to 200, wherein the antimony nanowires are prepared by a process comprising at least the process steps of
  • the antimony nanowires having a thickness in the range from 10 nm to 300 nm, preferably in the range from 20 nm to 150 nm, in particular in the range from 30 nm to 60 nm, and preferably having an aspect ratio of least 50, more preferably an aspect ratio in the range from 75 to 1000, in particular in the range from 100 to 200, which are obtainable or obtained by the inventive process, are preferably crystalline.
  • the antimony nanowires consist essentially of antimony, that means that the antimony-content of the antimony nanowires is preferably at least 90 %, more preferably in the range of from 95 % to 100 %, in particular from 97 % to 100 % by weight based on the total weight of the antimony nanowires.
  • the ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl) imide (BMP-TFSI, lo-Li-Tec) is used after drying under vacuum at 100 °C for several hours to water content below 3 ppm.
  • SbCl 3 99.99%, Sigma-Aldrich
  • SiCl 4 99.998%, Alfa Aesar
  • GaCl 3 99.999%, Sigma-Aldrich
  • Cu foil > 99.9%, GOULD Electronics
  • glassy carbon plate Alfa Aesar
  • Pt wires (99.997%, Alfa Aesar) were used as quasi-reference and counter electrodes.
  • the electrochemical cell was made of Teflon and clamped over a Teflon-covered O-ring yielding a geometric surface area of 0.5 cm 2 of the used substrate.
  • a Pt wire was coiled into three rings with a diameter of ⁇ 1.5 cm and was embedded into the Teflon cavity (0.6 cm deep and 0.5 cm thick) which surrounds the reaction area of the working electrode.
  • the Teflon cell looks like a small cylinder (8 mm in diameter, where the working electrode is underneath) surrounded by a bigger cylinder (18 mm in diameter, where the coiled Pt wire is placed on its Teflon ground).
  • This coiled wire was serving as a counter electrode.
  • a Pt wire was immersed into the reaction solution near from the working electrode (about 2 mm away from it) to serve as a quasi-reference electrode.
  • Teflon cell was filled with about 2 ml solution of 0.5 M SbCl 3 in BMP-TFSI IL.
  • the Sb deposition on Cu foil was then performed by applying a constant potential of -1.9 V vs. Pt quasi-reference electrode for ⁇ 1 hour at room temperature ( ⁇ 25 °C).
  • Figure 1 shows SEM images of the obtained deposit. No nanowires were obtained in the absence of GaCl 3 .
  • the Teflon cell was filled with about 2 ml solution of 0.5 M SbCl 3 + 0.1 M SiCl 4 in BMP-TFSI IL.
  • the Sb deposition on Cu foil was then performed by applying a constant potential of -2.4 V vs. Pt quasi-reference electrode for ⁇ 1 hour at room temperature ( ⁇ 25 °C).
  • Figure 2 shows SEM images of the obtained deposit. No Sb nanowires were obtained in the presence of SiCl 4 .
  • the Teflon cell was filled with about 2 ml of a solution of 0.5 M SbCl 3 + 0.1 M GaCl 3 in BMP-TFSI ionic liquid and the substrate was a Cu foil with a geometric surface area of 0.5 cm 2 .
  • the deposition was performed by applying a constant potential of - 1.9 V vs. Pt quasi-reference electrode for 1 hour at 25 °C.
  • the obtained deposit (Sb nanowires) was then removed from the reaction solution and was carefully rinsed with dried acetone for several times inside the glove box to remove the traces of the ionic liquid solution.
  • Figure 3 shows SEM images of the obtained Sb nanowires.
  • the Teflon cell was filled with about 2 ml of a solution of 0.5 M SbCl 3 + 0.1 M GaCl 3 + 0.2 M BMP-TFSI ionic liquid in propylene carbonate (PC) solvent and the substrate was a Cu foil with a geometric surface area of 0.5 cm 2 .
  • the deposition was performed by applying a constant potential of - 1.9 V vs. Pt quasi-reference electrode for 1 hour at 25 °C.
  • the obtained deposit (Sb with1-dimensional growth) was then removed from the reaction solution and was carefully rinsed with dried acetone for several times inside the glove box to remove the traces of the solution.
  • Figure 4 shows SEM images of the obtained Sb deposit.
  • the Teflon cell was filled with about 2 ml of a solution of 0.5 M SbCl 3 + 0.1 M GaCl 3 in BMP-TFSI ionic liquid and the substrate was a glassy carbon plate with a geometric surface area of 0.5 cm 2 .
  • the deposition was performed by applying a constant potential of - 1.9 V vs. Pt quasi-reference electrode for 1 hour at 25 °C.
  • the obtained deposit (Sb nanowires) was then removed from the reaction solution and was carefully rinsed with dried acetone for several times inside the glove box to remove the traces of the ionic liquid solution.
  • Figure 5 shows a SEM image of the obtained Sb nanowires.
EP16157979.2A 2016-03-01 2016-03-01 Verfahren zur herstellung von antimonnanodrähten Withdrawn EP3214207A1 (de)

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Cited By (1)

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WO2012170311A2 (en) 2011-06-06 2012-12-13 Washington State University Research Foundation Batteries with nanostructured electrodes and associated methods
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