WO1999049532A1 - Tin alloy electrode compositions for lithium batteries - Google Patents

Tin alloy electrode compositions for lithium batteries Download PDF

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Publication number
WO1999049532A1
WO1999049532A1 PCT/US1998/015295 US9815295W WO9949532A1 WO 1999049532 A1 WO1999049532 A1 WO 1999049532A1 US 9815295 W US9815295 W US 9815295W WO 9949532 A1 WO9949532 A1 WO 9949532A1
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WIPO (PCT)
Prior art keywords
electrochemically active
metal element
active metal
electrode
composition
Prior art date
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PCT/US1998/015295
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English (en)
French (fr)
Inventor
Robert L. Turner
Donald J. Mcclure
Larry J. Krause
Mary M. Buckett
Jeffery R. Dahn
Ou Mao
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3M Co
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Minnesota Mining and Manufacturing Co
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Application filed by Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Priority to DE69821262T priority Critical patent/DE69821262T2/de
Priority to JP2000538401A priority patent/JP2002508577A/ja
Priority to HK01104501.3A priority patent/HK1035262B/en
Priority to EP98937041A priority patent/EP1066659B1/en
Priority to AU85839/98A priority patent/AU8583998A/en
Priority to CA002325425A priority patent/CA2325425A1/en
Publication of WO1999049532A1 publication Critical patent/WO1999049532A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • 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
    • H01M4/40—Alloys based on alkali metals
    • 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
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M4/04—Processes of manufacture in general
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/134—Electrodes based on metals, Si or alloys
    • 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
    • H01M4/387—Tin or alloys based on tin
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/621—Binders
    • H01M4/622—Binders being polymers
    • H01M4/623—Binders being polymers fluorinated polymers
    • 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
    • H01M10/446—Initial charging measures
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • 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

  • This invention relates to electrode compositions useful in secondary lithium batteries
  • Two classes of materials have been proposed as anodes for secondary lithium batteries
  • One class includes materials such as graphite and carbon which are capable of intercalating lithium While the intercalation anodes generally exhibit good cycle life and coulombic efficiency, their capacity is relatively low
  • a second class includes metals that alloy with lithium metal Although these alloy-type anodes generally exhibit higher capacities relative to intercalation-type anodes, they suffer from relatively poor cycle life and coulombic efficiency
  • the invention provides electrode compositions suitable for use in secondary lithium batteries in which the electrode compositions have high initial capacities that are retained even after repeated cycling The electrode compositions also exhibit high coulombic efficiencies
  • the electrode compositions, and batteries incorporating these compositions are also readily manufactured
  • the invention features, in a first aspect, an electrode composition that includes (a) an electrochemically active metal element and (b) a non- electrochemically active metal element When incorporated in a lithium battery and cycled through one full charge-discharge cycle, the composition includes
  • the crystalline regions may be present prior to cycling or may appear only after one full charge-discharge cycle In the former case, the regions persist after one full charge-discharge cycle
  • an “electrochemically active metal element” is an element that reacts with lithium under conditions typically encountered du ⁇ ng charging and discharging in a lithium battery
  • a “non-electrochemically active metal element” is an element that does not react with lithium under those conditions In both cases, the metal element may be found in the electrode composition in the form of a metal containing only the element itself (l e . an elemental metal) or a compound containing the element in combination with one or more elements which may or may not be metal elements
  • An example of the latter is an intermetallic compound containing the metal element in combination with one or more metal elements Prior to cvchng.
  • the electrochemically active metal element is in the form of an intermetallic compound or an elemental metal
  • the compound itself need not be electrochemically active, although it may be
  • the non- electrochemically active metal element is part of a compound, the compound itself need not be non- electrochemically active although it may be - 2 -
  • An example of a preferred electrochemically active metal element is tin
  • preferred non-electrochemically active metal elements include molybdenum, niobium, tungsten, tantalum, iron, copper, and combinations thereof
  • Particularly preferred electrode compositions are those in which (a) the electrochemically active metal element is tin and the non-electrochemically active metal element is molybdenum, (b) the electrochemically active metal element is tin and the non-electrochemically active metal element is iron, (c) the electrochemically active metal element is tin and the non-electrochemically active metal element is niobium, (d) the electrochemically active metal element is tin and the non-electrochemically active metal element is tungsten, and (e) the electrochemically active metal element is tin and the non-electrochemically active metal element is tantalum
  • the crystalline regions are characterized by a discernible x-ray diffraction pattern characteristic of a crystalline material
  • at least one of the crystalline regions preferably includes the electrochemically active metal element and at least another of the crystalline regions includes the non-electrochemically active metal element
  • the crystalline regions are preferably separated by regions comprising the electrochemically active metal element and the non-electrochemically active metal element in which the relative proportions of the these elements vary throughout the thickness direction of the composition
  • the "thickness direction of the composition” refers to the direction perpendicular to the substrate on which the film is deposited
  • the "thickness direction of the composition” refers to the thickness direction of an individual particle
  • the regions separating the crystalline regions do not exhibit an electron diffraction pattern characteristic of a crystalline material They may be present prior to cycling, after cycling, or both before and after cycling
  • the electrode composition When the electrode composition is incorporated in a lithium battery and cycled to realize about 100 mAh/g of electrode composition, the electrode composition preferably exhibits a coulombic efficiency of at least about 99 0% (more preferably at least about 99 8%, even more preferably about 99 9%) after 100 full discharge cycles
  • the electrode composition may be provided in the form of a thin film or a powder
  • the invention features an electrode composition that includes (a) an electrochemically active metal element and (b) a non-electrochemically active metal element
  • the composition includes crystalline regions
  • the electrode composition exhibits a coulombic efficiency of at least about 99 0% (preferably at least about 99 8%, more preferably at least about 99 9%) after 100 full discharge cycles - 3 -
  • the crystalline regions may be present prior to cycling or may appear only after one full charge-discharge cycle In the former case, the regions persist after one full charge-discharge cycle
  • the electrochemically active metal element and non-electrochemically metal element have the definitions described above
  • the metal element may be found in the electrode composition in the form of a metal containing only the element itself (I e , an elemental metal) or a compound containing the element in combination with one or more elements which may or may not be metal elements
  • I e an elemental metal
  • An example of the latter is an intermetallic compound containing the metal element in combination with one or more metal elements Prior to cycling, however, the electrochemically active metal element is in the form of an intermetallic compound or an elemental metal
  • the electrode composition may be provided in the form of a thin film or a powder
  • An example of a preferred electrochemically active metal element is tin
  • Examples of preferred non- electrochemically active metal elements include molybdenum, niobium, tungsten, tantalum, iron, copper, and combinations thereof
  • Particularly preferred electrode compositions are those in which (a) the electrochemically active metal element is tin and the non-electrochemically active metal element is molybdenum, (b) the electrochemically active metal element is tin and the non- electrochemically active metal element is iron, (c) the electrochemically active metal element is tin and the non-electrochemically active metal element is niobium, (d) the electrochemically active metal element is tin and the non-electrochemically active metal element is tungsten, and (e) the electrochemically active metal element is tin and the non-electrochemically active metal element is tantalum
  • the crystalline regions are characterized by a discernible x-ray diffraction pattern
  • at least one of the crystalline regions preferably includes the electrochemically active metal element and at least another of the crystalline regions includes the non-electrochemically active metal element
  • the crystalline regions are preferably separated by regions comprising the electrochemically active metal element and the non-electrochemically active metal element in which the relative proportions of the these elements vary throughout the thickness direction of the composition (as defined, above) These regions separating the crystalline regions exhibit no discernible electron diffraction pattern characteristic of a crystalline material They may be present prior to cycling, after cycling, or both before and after cycling
  • the invention features a method of preparing an electrode composition that includes combining (a) a source comprising an electrochemically active metal element and (b) a source comprising a non-electrochemically active metal element to form an electrode composition characterized in that (I) when incorporated in a lithium battery and cycled through one full charge-discharge cycle, the electrode composition includes crystalline regions and - 4 -
  • the electrode composition when incorporated in a lithium battery and cycled to realize about 100 mAh/g of the composition, the electrode composition exhibits a coulombic efficiency of at least about 99 0% after 100 full discharge cycles
  • the source of the electrochemically active metal element and the source of the non-electrochemically active element are sequentially sputter-deposited onto a substrate In another preferred embodiment, the two sources are combined by ball milling
  • Fig 1 illustrates the cycling performance, in terms of reversible specific capacity (top graph) and coulombic efficiency (bottom graph), of a sputter-deposited tin-molybdenum electrode having 54 wt % tin and 46 wt % molybdenum
  • Fig 2 illustrates the cycling performance, in terms of reversible specific capacity (top graph) and coulombic efficiency (bottom graph), of a sputter-deposited tin-molybdenum electrode having 54 5 wt % tin and 45 5 wt % molybdenum
  • Fig 3 illustrates the cycling performance, in terms of reversible specific capacity (top graph) and coulombic efficiency (bottom graph), of a sputter-deposited tin-molybdenum electrode having 45 wt % tin and 55 wt % molybdenum
  • Fig 4 illustrates the cycling performance, in terms of reversible specific capacity (top graph) and coulombic efficiency (bottom graph), of a sputter-deposited tin-niobium electrode having 65 5 wt % tin and 34 5 wt % niobium
  • Fig 5 illustrates the cycling performance, in terms of reversible specific capacity (top graph) and coulombic efficiency (bottom graph), of a sputter-deposited tin copper electrode having
  • Fig 6 illustrates the cycling performance, in terms of reversible specific capacity (top graph) and coulombic efficiency (bottom graph), of a sputter-deposited tin-tungsten electrode having 43 7 wt % tin and 56 3 wt % tungsten
  • Fig 7 illustrates the cycling performance, in terms of reversible specific capacity (top graph) and coulombic efficiency (bottom graph), of a full cell featuring a sputter-deposited tin- molybdenum anode having 54 wt % tin and 46 wt % molybdenum and a L ⁇ CoO ⁇ conta ⁇ mng cathode
  • Fig 8 is a series of x ray diffraction profiles for a tin-molybdenum film having 54 wt % tin and 46 wt % molybdenum obtained after 0, 1, 4, and 10 cycles
  • Fig 9 reports the results of an m-situ x-ray diffraction experiment involving a tin metal electrode and an Sn 2 Fe electrode - 5 -
  • Fig 10 is an electron diffraction pattern of the tin-molybdenum film that is the subject of Fig 1
  • the invention features electrode compositions that are particularly useful as anodes for secondary lithium batteries
  • the electrode compositions feature an electrochemically active metal element and a non-electrochemically active metal element combined in a microstructure which, the inventors have discovered, results in an electrode composition that exhibits a high initial capacity that is substantially retained after repeated cycling
  • a suitable electrochemically active metal element is tin
  • suitable non-electrochemically active metal elements are molybdenum, niobium, tungsten, tantalum, iron, copper, and combinations thereof, with molybdenum being particularly preferred
  • These elements may be present in the form of single element metals, intermetallic compounds, or compounds featuring the metal element combined with one or more non-metallic elements
  • the particular form in which the element is present may change over the course of repeated cycling
  • alloys may form with other material present in the electrode composition
  • the electrochemically active metal element is present in the form of an elemental metal (e g , tin metal) or as an intermetallic compound prior to cycling
  • the microstructure of the electrode composition is characterized by the presence of small crystalline regions These regions give rise to x-ray and electron diffraction patterns characteristic of crystalline material
  • e g in the case of some compositions prepared by sputtering, these regions are present prior to cycling and remain after at least one full charge-discharge cycle
  • e g in the case of some compositions prepared by ball milling, these regions form only after the composition has been through one full charge- discharge cycle
  • the crystalline regions are very small, three-dimensional structures characterized by x- , y-, and z-dimensions At least one of these dimensions is no greater than about 500 angstroms
  • this dimension does not substantially increase after a total of at least 10 cycles (preferably at least 100 cycles, more preferably at least 1000 cycles)
  • the crystalline regions therefore, remain very small even after repeated cycling It is believed that this property contributes to the ability of the electrode composition to substantially retain its initial capacity after repeated cycling
  • crystalline regions that contain the electrochemically active metal element and separate crystalline regions that contain the non-electrochemically active metal element
  • crystalline regions that contain the electrochemically active metal element
  • non-electrochemically active metal element For example, in the case of a sputter-deposited tin- molybdenum electrode composition, prior to cycling there may be crystalline regions containing tin metal and crystalline regions containing molybdenum metal - 6 -
  • the crystalline regions are preferably separated by regions that, when examined by transmission electron microscopy, do not give rise to an electron diffraction pattern characteristic of a crystalline material Specifically, these regions do not exhibit the relatively sharp rings or spots characteristic of a crystalline material
  • high resolution electron microscopy which can provide structural information on an atomic (2 angstrom) scale, likewise failed to detect the presence of crystalline material
  • these regions can be described as containing material of a highly disordered atomic arrangement on a length scale no greater than about 20 angstroms, preferably no greater than about 10 angstroms
  • composition modulation The composition preferably varies on a scale no greater than about 50 angstroms, preferably no greater than about 20 angstroms Composition modulation may be present before and/or after cycling, as long as crystalline regions are also present It is believed that the presence of these composition modulated areas contributes to the ability of the electrode to retain its capacity after cycling because these areas are more flexible than the crystalline areas, enabling the composition as a whole to dissipate cycling-induced stresses that would otherwise cause the electrode to crack and fail
  • the electrode compositions may be prepared in the form of thin films or powders according to a variety of methods Examples include sputtering, chemical vapor deposition, vacuum evaporation, melt spinning
  • the preferred process for preparing the electrode composition is sputtering in which the electrochemically active metal element and the non-electrochemically active metal element are sequentially sputter-coated onto a substrate (e g , a copper substrate)
  • the electrode includes a sputter-deposited prelayer of one of the elements and a sputter-deposited overlayer of one of the elements
  • the substrates are placed near the edge of a nominally 25 inch diameter turntable which rotates continuously below two 6 inch diameter magnetron sputtering sources operated continuously A layer of one material is deposited as the substrate passes under the first source, and a layer of the second material is deposited as the substrate passes under the second source
  • the nominal thickness of each layer can be predicted and controlled By calculating the total - 7 - deposition time, the thickness of the entire sample, and the number of individual layers, can be determined
  • the final structure may not contain evidence of a layered structure
  • evidence of a layered structure may be found in the case of thicker layers
  • the electrode compositions are particularly useful as anodes for secondary lithium batteries
  • the electrode is combined with an electrolyte and a cathode (the counterelectrode)
  • the electrolyte may be a solid or liquid electrolyte
  • solid electrolytes include polymeric electrolytes such as polyethylene oxide, polytetrafluoroethylene, fluorine-containing copolymers, and combinations thereof
  • liquid electrolytes include ethylene carbonate, diethylene carbonate, propylene carbonate, and combinations thereof
  • the electrolyte is provided with a lithium electrolyte salt
  • suitable salts include LiPF ⁇ , L1BF4, and L1CIO4
  • Suitable cathode compositions for liquid electrolyte-containing batteries include L1C0O2, L1C002N108O2, and Lii 07-vIn ⁇ 93O4
  • suitable cathode compositions for solid electrolyte-containing batteries include L1V 3 O8 and L1V2O 5
  • a series of electrodes films was prepared by sputtering and, in some instances, characterized according to the following general procedures
  • Electrode compositions in the form of thin films were prepared by sequential sputtering using a modified Perkin-Elmer Randex Model 2400-8SA Sputtering System
  • the original 8 inch diameter rf sputter sources were replaced with 6 inch diameter dc magnetron sputtering sources commercially available from Materials Science of San Diego CA
  • the sputtering sources were powered using Advanced Energy Model MDX-10 dc sputtering power supplies operating in constant current mode
  • the turntable drive unit of the Randex System was replaced with a stepper motor to improve rotation speed range and control
  • the System was pumped with an untrapped oil diffusion pump backed by a conventional rotary vane pump
  • Sputtering was performed at argon pressures in the range of 3-30 mTorr The pressure was maintained by controlling the argon flow in combination with a Venetian blind-style conductance limiter placed over the diffusion pump
  • the sputtering sources were started up using a mechanical shutter between the sources and the copper substrate This removed contaminants from the source surface without depositing them on the substrate surface
  • a "pre-layer” made of a single material of known identity was deposited onto the substrate The purpose of the pre-layer was to insure good adhesion between the substrate and the sputter deposited film
  • both sources were started up at pre-determined current levels and deposition initiated After a suitable deposition time, one or both sources were turned off A "post-layer" of a single material of known identity was then deposited, after which the system was vented and the sample removed
  • composition, microstructure, and cycling behavior of these films are described in further detail, below.
  • the chemical composition, in wt % and vol %, was determined using a series of calibration experiments in which a single source was operated at a fixed current for a fixed period of time The thickness of the resulting sample was then determined using a profilometer The vol % of the sample was predicted based upon the calibration experiments assuming that the total thickness of any one material was linearly proportional to the deposition current and the deposition time The wt % values were calculated from the vol % values using handbook values of material densities
  • TEM Transmission electron microscopy
  • samples Prior to cycling, samples were prepared from sputtered films either by crushing to powder or by cutting the film in either the radial direction (1 e , slices were taken along the radial direction of the film) or the perpendicular direction of the film (1 e , slices were taken along the tangential direction of the film)
  • the cut samples were then embedded in 3M Scotchcast Electrical Resin #5 (commercially available from 3M Company of St Paul, MN) and ultramicrotomed to obtain slices thin enough for TEM examination Slice thickness was nominally less than about 20 nm
  • the first type consisted of a HITACHI H9000NAR transmission electron microscope which operates at an accelerating voltage of 300 kV It is capable of a point-to-point resolution of 1 75 angstroms and a microprobe resolution of 16 angstroms for x-ray microanalysis
  • the microanalysis instrumentation consisted of a NORAN VOYAGER III Direct-to-digital image acquisition and quantitative length measurements were performed by a GAT AN slow-scan CCD (charged-couple device) camera
  • the second type of TEM instrumentation consisted of a JEOL 4000 FEX which - 11 -
  • Samples were also examined by TEM after cycling by opening up the electrochemical cell in an inert atmosphere after a specified number of cycles and removing the sputtered film from the copper substrate by repeated scoring of the electrode surface with a razor blade
  • the resulting material in the form of a powder, was then collected onto a carbon mesh supported by a copper grid and inserted into the microscope for structural analysis
  • Electrodes were cut from the sputtered films with a die measuring either 7 1 or 7 5 mm in diameter Two types of cells for testing were then prepared In the first type, the sputtered film formed the cathode and a lithium foil (about 300 micrometers thick, available from Ald ⁇ ch Chemical Co of Milwaukee, WI) formed both the anode and the reference electrode of a 1225 coin cell In the second type (a full cell), the sputtered film formed the anode and a L ⁇ Co ⁇ 2 -conta ⁇ n ⁇ ng composition formed the cathode
  • the L ⁇ Co ⁇ 2-conta ⁇ mng composition was made by combining 83% wt % L1C0O2 (available from Nippon Chemical Cellseed under the designation "C-10"), 7 wt % fluoropolymer binder (available from Elf Atochem under the designation "Kynar 461 "), 7 5 wt % KS-6 carbon (available from Timcal), and 2 5% Super P Carbon (available from MMM Carbon
  • the electrochemical performance of the cells was measured using a MACCOR cycler
  • the cycling conditions were typically set for constant current charge and discharge at approximately a C/3 rate (0 5 mA/cm 2 ) with typical cutoff voltages of 5 mV and 1 4 V
  • the coulombic efficiency was determined as the charge recovery or capacity of dehthiation divided by the capacity of hthiation
  • the coulombic efficiency was determined as the ratio of the discharge capacity to the charge capacity
  • the resistance is higher at the beginning of the cycle life and drops after 10-20 cycles.
  • This resistive effect causes the capacity of the cell to drop initially and then stabilize after 10-20 cycles.
  • the resistive effect also causes the measured coulombic efficiency to be higher than 100% in the first few cycles because the capacity for dehthiation is increasing with cycle number out to 10-20 cycles - 12 -
  • a film containing 55 2 wt % tin and 44 8 wt % copper was prepared by sputter deposition under the conditions shown in Table I
  • the tin was sputter deposited at a rate of 555 angstroms/minute, while the copper was sputter deposited at a rate of 367 angstroms/minute
  • the film contained 60 vol % tin and 40 vol % copper, calculated based upon these sputter rates
  • the film thickness was 7 1 micrometers and the film density was approximately 7 8 g/cm
  • the film had a pre-layer of pure copper measuring approximately 600 angstroms thick and a post-layer of pure tin measuring approximately 2500 angstroms thick
  • the cycling behavior of the electrode film was tested as described above using a coin cell featuring a lithium foil anode and the sputtered film as the cathode
  • the first discharge or hthiation of the film was controlled by setting the cycling conditions to taper the current at 5 mV so that the cell was hthiated to at least 400 mAh g
  • the cell was then placed under charge and discharge cycling conditions using a current of 0 5 mA/cm and cutoff voltages of 5 mV and 1 4 V
  • the specific capacity and coulombic efficiency of the cell in shown in Fig 5 The results demonstrate that an electrode composition using tin as the electrochemically active metal element and copper as the non-electrochemically active metal element yields stable reversible capacities of 125 mAh g for at least 100 cycles, which is a longer cycle life than pure tin, although the coulombic efficiency was less than 99 0% after a few cycles
  • a film containing 54 wt % tin and 46 wt % molybdenum was prepared by sputter deposition under the conditions shown in Table I The tin was sputter deposited at a rate of 550 - 13 -
  • the film contained 62 vol % tin and 38 vol % molybdenum, calculated based upon these sputter rates
  • the film thickness was 5 3 micrometers and the film density was approximately 7 3 g/cm
  • the film had a pre-layer of pure molybdenum measuring approximately 700 angstroms thick and a post-layer of pure tin measuring approximately 2500 angstroms thick
  • TEM analysis of the film prior to cycling revealed that the microstructure of the film included crystalline tin particles in a compositionally modulated matrix phase
  • Electron diffraction patterns indicated the presence of a two phase microstructure crystalline tin (as evidenced by sharp spots in a ring pattern which indexes to tetragonal tin) and a matrix phase characterized by a broad diffuse ring pattern, suggesting the absence of ordered crystalline material
  • High resolution electron microscopy verified that the matrix phase was disordered on a 10 angstrom scale
  • TEM analysis of the radially cut samples showed that the measured average tin particle size was 5 +/- 1 3 nm by 19 +/- 5 9 nm
  • the measured range of particle sizes was from 3 x 17 nm (smallest) to 7 x 31 nm (largest)
  • the tin particles had aspect ratios ranging from approximately 2 1 to 6 1 , with the long dimension parallel to the plane of the film
  • TEM analysis of the perpendicularly cut samples showed that the measured average tin particle size was 7 +/- 2 0 nm by 33 +/- 12 7 nm The measured range of particle sizes was from 4 x 12 nm (smallest) to 8 x 67 nm (largest) The tin particles had aspect ratios ranging from approximately 1 2 1 to 7 1 , with the long dimension parallel to the plane of the film
  • the cycling behavior of the electrode film was tested as described above using a coin cell featuring a lithium foil anode and the sputtered film as the cathode
  • the first discharge or lithiation of the film was controlled by setting the cycling conditions to taper the current at 5 mV so that the cell was hthiated to at least 400 mAh/g
  • the cell was then placed under charge and discharge cycling conditions using a current of 0 5 mA/cm and cutoff voltages of 5 mV and 1 4 V
  • the specific capacity and coulombic efficiency of the cell in shown in Fig 1
  • the results demonstrate that the sputtered tin-molybdenum film exhibited a reversible capacity of approximately 300 mAh/g for at least 50 cycles before the coulombic efficiency dropped below 99 0%
  • Full cells were constructed as described above using the sputtered film as an anode and a L ⁇ Co ⁇ 2-conta ⁇ n ⁇ ng composition as the cathode
  • the mass balance calculated based upon the weight of L1C0O 2 portion of the cathode and the weight of the entire tin-molybdenum anode, was 3 3 1
  • the cell were then cycled at a constant charge and discharge current of 0 5 mA/cm from 2 2 to 4 2 V
  • the discharge current was allowed to drop to 50 microamps/cm before onset of the charge current
  • the specific capacity and coulombic efficiency of the cell in shown in Fig 7 The dip in the plots around cycle 15 represents a change in the current from 0 25 mA/cm to 0 50 mA cm
  • the first charge capacity was 145 mAh g for L1C0O 2 and 450 mAh/g for the tin-molybdenum material in the anode
  • the irreversible capacity in the first cycle was 30%
  • the specific capacity of the tin-molybdenum is similar to what was obtained in the coin cells described above using lithium foil as the anode
  • the specific capacity of the L1C0O2 was maintained at 100 mAh g, which is a reasonable capacity for this material
  • a tin-molybdenum film identical to the above-described film was prepared with the exception that it did not contain a tin post-layer
  • the film was then incorporated in a coin cell containing a lithium foil anode and electrochemically cycled as described above X-ray diffraction data was gathered on the film after 0, 1 , 4, and 10 full cycles The results are shown in Fig 8(a)-(d)
  • Fig 8(a) shows the x-ray diffraction pattern of the film as it was deposited
  • the peak near 31 degrees is from small grains of tin and the broad peak near 39 degrees is from the tin- molybdenum matrix phase
  • the vertical line at 40 6 degrees marks the position expected for pure crystalline molybdenum
  • Fig 8(b) shows the x-ray diffraction pattern of the film in the charged state after the completion of one full charge discharge cycle
  • the peak from the matrix phase is similar in position and width to that of the uncycled film
  • the solid smooth line is a calculated pattern for LiSn, calculated using the crystal structure disclosed in Z Naturforsch 28B, pp 246-248 (1973) and assuming grain sizes of 5 nm
  • Fig 8(c) shows the x-ray diffraction pattern of the film in the charged state after the completion of four full charge discharge cycles Peaks for tin and for the matrix phase are again - 16 -
  • Fig 8(d) shows the x-ray diffraction pattern of the film in the charged state after the completion of ten full charge-discharge cycles
  • the electrode has begun to crack from the copper substrate, as shown by x-ray peaks attributable to the molybdenum pre-layer and the copper substrate (peak having a tail at 50 degrees) Nevertheless, comparing the results with the data in Fig 8(c), and noting the change in intensity scale between the two figures, it can be seen that the tin peak has substantially the same intensity and half-width as the film after four cycles The same can be said for the peak attributable to the matrix phase, although the results are somewhat obscured by the presence of a peak attributable to the molybdenum pre-layer
  • a film containing 54 5 wt % tin and 45 5 wt % molybdenum was prepared by sputter deposition under the conditions shown in Table I
  • the tin was sputter deposited at a rate of 110 angstroms/minute, while the molybdenum was sputter deposited at a rate of 60 angstroms/minute
  • the film contained 62 6 vol % tin and 37 4 vol % molybdenum, calculated based upon these sputter rates
  • the film thickness was 4 1 micrometers and the film density was approximately 9 2 g/cm
  • the film had a pre-layer of pure molybdenum measuring approximately 200 angstroms thick and a post-layer of pure tin measuring approximately 500 angstroms thick
  • the cycling behavior of the electrode film was tested as described above using a coin cell featuring a lithium foil anode and the sputtered film as the cathode
  • the first discharge or lithiation of the film was controlled by setting the cycling conditions to taper the current at 5 mV so that the cell was hthiated to at least 400 mAh/g
  • the cell was then placed under charge and discharge cycling conditions using a current of 0 5 mA/cm" and cutoff voltages of 5 mV and 1 4 V
  • the specific capacity and coulombic efficiency of the cell in shown in Fig 2
  • the results demonstrate that the sputtered tin-molybdenum film, which was sputtered at lower tin and molybdenum rates compared to Example 2, exhibited a reversible capacity of approximately 300 mAh/g for at least 50 cycles and a coulombic efficiency of approximately 99 0%
  • a film containing 45 wt % tin and 55 wt % molybdenum was prepared by sputter - 17 -
  • the tin was sputter deposited at a rate of 555 angstroms/minute, while the molybdenum was sputter deposited at a rate of 487 angstroms/minute
  • the film contained 53 3 vol % tin and 46 7 vol % molybdenum, calculated based upon these sputter rates
  • the film thickness was 5 6 micrometers and the film density was approximately 9 2 g/cm
  • the film had a pre-layer of pure molybdenum measuring approximately 1000 angstroms thick and a post-layer of pure tin measuring approximately 2500 angstroms thick
  • the cycling behavior of the electrode film was tested as described above using a coin cell featuring a lithium foil anode and the sputtered film as the cathode
  • the first discharge or lithiation of the film was controlled by setting the cycling conditions to taper the current at 5 mV so that the cell was hthiated to at least 400 mAh/g
  • the cell was then placed under charge and discharge cycling conditions using a current of 0 5 mA/cm and cutoff voltages of 5 mV and 1 4 V
  • the specific capacity and coulombic efficiency of the cell in shown in Fig 3
  • the results demonstrate the sputtered tin-molybdenum film, in which the wt % of molybdenum was higher than the film of Example 2, exhibited a reversible capacity of approximately 200 mAh/g and a coulombic efficiency of approximately 99 0% for at least 400 cycles Comparing these results with the results of Example 2 demonstrates that as the wt % of molybdenum increases, the specific capacity
  • a film containing 65 5 wt % tin and 34 5 wt % niobium was prepared by sputter deposition under the conditions shown in Table I
  • the tin was sputter deposited at a rate of 555 angstroms/mmute, while the niobium was sputter deposited at a rate of 250 angstroms/minute
  • the film contained 69 vol % tin and 31 vol % niobium, calculated based upon these sputter rates
  • the film thickness was 4 8 micrometers and the film density was approximately 8 6 g/cm
  • the film had a pre-layer of pure niobium measuring approximately 500 angstroms thick and a post-layer of pure tin measuring approximately 2500 angstroms thick
  • TEM analysis of the film prior to cycling revealed that the microstructure of the film included crystalline particles (present in TEM micrographs as dark cigar-shaped regions) in a compositionally modulated matrix phase (present in TEM micrographs as striped regions)
  • X-ray microanalysis demonstrated that the crystalline particles were tin-rich relative to the bulk composition
  • Bulk "white' regions interspersed between the striped regions were revealed by x-ray microanalysis to be mobium- ⁇ ch relative to the bulk composition
  • Electron diffraction patterns also indicated the presence of a two phase microstructure crystalline tin and a matrix phase characterized by a broad diffuse ring pattern, suggesting the absence of crystalline material
  • High resolution electron microscopy verified that the matrix phase - 18 -
  • TEM analysis of the radially cut samples showed that the measured average crystalline particle size was 5 +1- 1 8 nm by 33 +/- 8 0 nm
  • the measured range of particle sizes was from 3 x 20 nm (smallest) to 6 x 42 nm (largest)
  • the crystalline particles had aspect ratios ranging from approximately 3 1 to 10 1 , with the long dimension parallel to the plane of the film
  • TEM analysis of the perpendicularly cut samples showed that the measured average crystalline particle size was 8 4-/- 1 8 nm by 44 +/- 12 4 nm
  • the measured range of particle sizes was from 6 x 26 nm (smallest) to 5 x 80 nm (largest)
  • the tin particles had aspect ratios ranging from approximately 1 1 1 to 15 1
  • the cycling behavior of the electrode film was tested as described above using a coin cell featuring a lithium foil anode and the sputtered film as the cathode
  • the first discharge or lithiation of the film was controlled by setting the cycling conditions to taper the current at 5 mV so that the cell was hthiated to at least 400 mAh/g
  • the cell was then placed under charge and discharge cycling conditions using a current of 0 5 mA cm 2 and cutoff voltages of 5 mV and 1 4 V
  • the specific capacity and coulombic efficiency of the cell in shown in Fig 4 The results demonstrate that films using niobium as the non-electrochemically active metal element exhibit a reversible capacity of 225 mAh g and a coulombic efficiency greater than 99 0% for at least 70 cycles
  • a film containing 43 7 wt % tin and 56 3 wt % tungsten was prepared by sputter deposition under the conditions shown in Table I
  • the tin was sputter deposited at a rate of 560 angstroms/minute, while the tungsten was sputter deposited at a rate of 275 angstroms/minute
  • the film contained 67 3 vol % tin and 32 7 vol % tungsten, calculated based upon these sputter rates
  • the film thickness was 8 8 micrometers and the film density was approximately 6 g/cm
  • the film had a pre-layer of pure tungsten measuring approximately 680 angstroms thick and a post-layer of pure tin measuring approximately 2800 angstroms thick
  • the cycling behavior of the electrode film was tested as described above using a coin cell featuring a lithium foil anode and the sputtered film as the cathode
  • the first discharge or lithiation of the film was controlled by setting the cycling conditions to taper the current at 5 mV so - 20 - that the cell was hthiated to at least 400 mAh g
  • the cell was then placed under charge and discharge cycling conditions using a current of 0 25 mA/cm and cutoff voltages of 5 mV and 1 4 V
  • the specific capacity and coulombic efficiency of the cell in shown in Fig 6
  • the results demonstrate the sputtered film, in which the non-electrochemically active metal element was tungsten, exhibited a reversible capacity of approximately 200 mAh/g and a coulombic efficiency of approximately 99 0% for at least 40 cycles
  • a film containing 62 wt % tin and 38 wt % molybdenum was prepared by sputter deposition under the conditions shown in Table I
  • the tin was sputter deposited at a rate of 780 angstroms/minute, while the molybdenum was sputter deposited at a rate of 340 angstroms/minute
  • the film contained 69 vol % tin and 31 vol % molybdenum, calculated based upon these sputter rates
  • the film thickness was 5 1 micrometers and the film density was approximately 9 9 g/cm
  • the film had a pre-layer of pure molybdenum measuring approximately 700 angstroms thick It did not have a post-layer
  • Electrode compositions were prepared by ball milling and, in some instances, characterized according to the following general procedures
  • a Spex 8000 high-impact mixer mill was used to violently shake sealed hardened steel vials for periods up to 40 hours
  • the desired amounts of elemental powders or intermetallic compounds were added to a hardened steel vial, along with several hardened steel balls measuring 12 7 mm in diameter
  • the vial was then sealed and transferred to a Spex 8000 high-impact mixer mill where it was shaken violently Milling times were generally on the order of about 20 hours
  • Electrodes were prepared by coating slurries of the powders onto a copper foil and then evaporating the carrier solvent Specifically, about 86% by weight powder (prepared by ball milling), 8% by weight Super S carbon black (MMM Carbon, Belgium), and 6% by weight polyvinyhdene fluoride (Atochem) were thoroughly mixed with N-methyl pyrrohdinone by stirring in a sealed bottle to make a slurry, the polyvinyhdene fluoride was pre-dissolved in the N-methyl pyrrohdinone prior to addition of the powder and carbon black The slurry was spread in a thin layer (about 150 micrometers thick) on the copper foil with a doctor-blade spreader The sample was then placed in a muffle oven maintained at 105* C to evaporate the N-methyl pyrrohdinone solvent over a 3 hour period
  • Circular electrodes measuring 1 cm in diameter were cut from the dried film using an electrode punch The electrodes were weighed, after which the weight of the copper was subtracted and the active mass of the electrode calculated (I e , the total weight of the electrode multiplied by the fraction of the electrode made of the active electrode powder)
  • the electrodes were used to prepare coin cells for testing A lithium foil having a thickness of 125 micrometers functioned as the anode and reference electrode
  • the cell featured 2325 hardware, equipped with a spacer plate (304 stainless steel) and a disc spring (mild steel) The disc spring was selected so that a pressure of about 15 bar would be applied to each of the cell electrodes when the cell was crimped closed
  • the separator was a Celgard #2502 microporous polypropylene film (Hoechst-Celanese) which had been wetted with a 1M solution of LiPF ⁇ dissolved in a 30 70 volume mixture of ethylene carbonate and diethyl carbonate (Mitsubishi Chemical) Cycling conditions were typically set at a constant current of 37 mA/g of active material Cutoff voltages of 0 0 V and 1 3 V were used
  • Powder x-ray diffraction patterns were collected using a Siemens D5000 diffractometer equipped with a copper target x-ray tube and a diffracted beam monochromator Data was collected between scattering angles of 10 degrees and 80 degrees
  • the cell was mounted in a Siemens D5000 diffractometer and slowly discharged and - 22 -
  • An intermetallic compound, Sn2Fe was prepared by melting together stoichiomet ⁇ c ratios of tin and iron (obtained in powder form from Ald ⁇ ch Co of Milwaukee, WI) in a radio frequency induction furnace under inert gas After a homogeneous melt was obtained, the sample was removed from the furnace, transferred to a tube furnace, and annealed at 500EC for about 60 hours under argon flow The sample was then broken into chunks with a hammer, after which 2 grams of the sample was placed into a hardened steel vial, along with two 12 7 mm diameter hardened steel balls, and the vial sealed The loading and sealing were conducted in an argon-filled glove box The sample was then milled for 20 hours following the general procedure described above The sample contained 66 6 atomic % tin and 33 3 atomic % iron
  • a ball milled powder was prepared according to the procedure of Example 8 except that before being placed in the steel vial, the sample was ground using a mortar and pestle to form 50 micron-sized particles Following milling, an electrochemical cell was constructed as described above and its cycling behavior tested The irreversible capacity (in mAh g up to 1 3 V) and reversible capacity (mAh g) are reported in Table V Cycle life was not tested ("NT")
  • a ball milled powder was prepared according to the procedure of Example 8 except that the powder was prepared by adding 0 402 g iron, 1 715 g tin, and 0 026 g graphite powder (mesocarbon microbeads from Osaka Gas Ltd which had been heated to 2650EC) directly to the milling vial
  • the sample contained 60 6 atomic % tin, 30 3 atomic % iron, and 9 1 atomic % carbon X-ray diffraction data suggests that the sample contains a mixture of an Sn?Fe phase and a carbon phase
  • a ball milled powder was prepared according to the procedure of Example 8 except the powder was prepared by adding 0 404 g iron, 1 711 g tin, and 0 066 g graphite powder (mesocarbon microbeads from Osaka Gas Ltd which had been heated to 2650E C) directly to the milling vial
  • the sample contained 54 1 atomic % tin, 27 0 atomic % iron, and 18 9 atomic % carbon X-ray diffraction data suggests that the sample contains a mixture of an Sn2Fe phase and a carbon phase
  • a ball milled powder was prepared according to the procedure of Example 8 except the powder was prepared by adding 0 406 g iron, 1 725 g tin, and 0 104 g graphite powder (mesocarbon microbeads from Osaka Gas Ltd which had been heated to 2650EC) directly to the milling vial
  • the sample contained 47 6 atomic % tin, 23 8 atomic % iron, and 28 6 atomic % carbon X-ray diffraction data suggests that the sample contains a mixture of an Sn ⁇ Fe phase and a carbon phase
  • a ball milled powder was prepared according to the procedure of Example 8 except the relative amounts of iron and tin were selected to yield a sample having 50 0 atomic % tin and 500 atomic % iron In addition, iron and tin were adding directly to the milling vial, rather than being melted together Following milling, an electrochemical cell was constructed as described above and its cycling behavior tested The irreversible capacity (in mAh/g up to 1 3 V), reversible capacity (mAh g), and cycle life before the capacity fell to 50% of the initial reversible capacity at C/10 are reported in Table V
  • a ball milled powder was prepared according to the procedure of Example 8 except the relative amounts of iron and tin were selected to yield a sample having 40 0 atomic % tin and 60 0 atomic % iron In addition, the sample was milled for 38 hours Following milling, an electrochemical cell was constructed as described above and its cycling behavior tested The irreversible capacity (in mAh g up to 1 3 V), reversible capacity (mAh/g), and cycle life before the capacity fell to 50% of the initial reversible capacity at C/10 are reported in Table V Two samples were tested
  • a ball milled powder was prepared according to the procedure of Example 8 except the relative amounts of iron and tin were selected to yield a sample having 37 5 atomic % tin and 62 5 atomic % iron In addition, the sample was milled for 19 hours Following milling, an electrochemical cell was constructed as described above and its cycling behavior tested The - 25 -
  • a ball milled powder was prepared according to the procedure of Example 8 except the powder was prepared by adding 0 866 g iron, 1 277 g tin, and 0 049 g graphite powder (mesocarbon microbeads from Osaka Gas Ltd which had been heated to 2650EC) directly to the milling vial
  • the sample contained 35 4 atomic % tin, 51 2 atomic % iron, and 13 4 atomic % carbon X-ray diffraction revealed the sample to be a mixture of Sn 2 Fe and SnF ⁇ 3C phases
  • a ball milled powder was prepared according to the procedure of Example 8 except the powder was prepared by adding 0 866 g iron, 1 277 g tin, and 0 136 g graphite powder (mesocarbon microbeads from Osaka Gas Ltd which had been heated to 2650EQ directly to the milling vial
  • the sample contained 28 7 atomic % tin, 41 6 atomic % iron, and 29 7 atomic % carbon X-ray diffraction revealed the sample to be a mixture of S ⁇ Fe and SnF ⁇ 3C phases
  • a ball milled powder was prepared according to the procedure of Example 8 except the powder was prepared by adding 1 017 g iron, 1 083 g tin, and 0 066 g graphite powder (mesocarbon microbeads from Osaka Gas Ltd which had been heated to 2650EC) directly to the milling vial
  • the sample contained 27 8 atomic % tin, 55 6 atomic % iron, and 16 7 atomic % carbon X-ray diffraction revealed the sample to be a mixture of Sn2Fe and SnFeiC phases
  • a ball milled powder was prepared according to the procedure of Example 8 except the powder was prepared by adding 1 044 g iron, 1 070 g tin, and 0 164 g graphite powder (mesocarbon microbeads from Osaka Gas Ltd which had been heated to 2650EC) directly to the milling vial
  • the sample contained 22 1 atomic % tin, 44 2 atomic % iron, and 33 6 atomic % carbon X-ray diffraction revealed the sample to be a mixture of Sn 2 Fe and SnFesC phases
  • a ball milled powder was prepared according to the procedure of Example 8 except the powder was prepared by adding 1 160 g iron, 1 823 g tin, and 0 084 g graphite powder (mesocarbon microbeads from Osaka Gas Ltd which had been heated to 2650EC) directly to the milling vial
  • the sample contained 20 0 atomic % tin, 60 0 atomic % iron, and 20 0 atomic % carbon X-ray diffraction revealed the sample to be a mixture of S ⁇ Fe and SnFe3C phases

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PCT/US1998/015295 1998-03-26 1998-07-23 Tin alloy electrode compositions for lithium batteries Ceased WO1999049532A1 (en)

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