Classifications

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  • H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
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  • H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
  • H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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  • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
  • H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
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  • H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
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  • H01M2300/00—Electrolytes
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  • H01M2300/002—Inorganic electrolyte
  • H01M2300/0022—Room temperature molten salts
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  • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
  • H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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  • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
  • H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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  • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
  • H01M4/139—Processes of manufacture
  • H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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  • H01M4/40—Alloys based on alkali metals
  • H01M4/405—Alloys based on lithium
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  • H01M4/46—Alloys based on magnesium or aluminium
  • H01M4/463—Aluminium based
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  • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
  • H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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  • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
  • H01M4/582—Halogenides
• • 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 present invention relates to batteries, in particular to rechargeable lithium- based batteries.
• Li-ion lithium ion
• Conventional organic electrolytes have high vapor pressure, and are flammable.
• Molten salt electrolytes also known as molten salts, have a low melting point and low vapor pressure, therefore they have potentially higher safety than organic electrolytes.
• Lithium-based batteries such as rechargeable Li-ion batteries
• a molten salt electrolyte may also provide higher energy/power density, compared to a conventional battery.
• electrolyte decomposition seriously restricts applications of molten salt type Li-ion batteries. Demonstrating high voltage molten salt electrolyte lithium based batteries would be of great value.
• a battery according to an embodiment of the present invention is a lithium-based battery, such as a rechargeable lithium-ion battery, comprising a positive electrode, a negative electrode, and a molten salt electrolyte that is electrically conductive lithium ions.
• the positive electrode includes a positive active material that has an electrochemical potential of at least approximately 4.5 volts relative to lithium.
• the electrolyte may further include a source of lithium ions, such as a lithium compound.
• the electrolyte may include one or more lithium salts selected from the group consisting of LiPF 6 , LiBF 4 , LiAsF 6 , LiClO 4 , LiSO 3 CF 3 , LiTFSI, LiBETI, LiTSAC, LiB(CF 3 COO) 4 , and the like.
• the positive active material and negative active material may both comprise materials that reversibly intercalate lithium ions.
• the positive active material may be a lithiated transition metal oxide, such as Li 2 NiMn 3 O 8 , LiNiVO 4 , LiCoVO 4 , and Li[CoPO 4 ].
• the positive active material may have the formula Li x MyN 2 O, where M is selected from a group consisting of Ni, Mn, V, and Co, and N is a heteroatomic species different from M, such as Ni, Mn, V, Co, or P. N can be omitted.
• the positive active material may also be fluorinated, for example as a fluorophosphate.
• the negative active material may also be a lithiated transition metal oxide, such as lithium titanium oxide or lithium cobalt oxide, and may also be a carbon-containing material (such as activated carbon) capable of reversibly intercalating lithium ions, a tin containing material, a silicon-containing material, or other material.
• the negative active material comprises lithium metal, or an alloy thereof, and the battery is a rechargeable lithium battery.
• the negative electrode may comprise a layer of lithium metal, or a lithium-aluminum alloy.
• the molten salt electrolyte comprises an onium, such as a sulfonium, including fluorinated sulfoniums, and may comprise a trifluorosulfonylimide anion. Both the positive electrode and/or the negative electrode may further include an electron conductive material, such as a carbon-containing material, such as a carbon black.
• the molten salt electrolyte preferably includes a quaternary ammonium or ternary sulfonium species.
• Example molten salts include diethyl-methyl-sulfonium FSI, methyl- propyl-pyridinium FSI, and dimethyl-ethyl-imidazolium FSI.
• an improved lithium based battery includes a molten salt electrolyte and a high voltage positive electrode.
• Lithium-based batteries include lithium ion batteries, lithium batteries having a lithium negative electrode, and similar batteries.
• FIGS. IA and IB are schematics showing the possible structure of a high voltage Li-ion battery
• Figure 2 shows CV results showing the oxidation potential of various molten salt electrolytes
• Figure 3 shows charge-discharge curves showing the performance of example batteries.
• a battery according to an embodiment of the present invention comprises a negative electrode, a positive electrode, and an electrolyte.
• the positive electrode includes a positive active material having a potential greater than 4.5 volts compared with lithium.
• the positive active material is a lithiated transition metal compound, such as a lithium nickel manganese oxide, lithium nickel vanadium oxide, lithium cobalt vanadium oxide, or lithium cobalt phosphate, for example Li 2 NiMn 3 O 8 , LiNiVO 4 , LiCoVO 4 , Li[CoPO 4 ], and the like.
• Other examples include lithium nickel phosphate, lithium nickel fluorophosphate, and lithium cobalt fluorophosphate; i.e.
• the lithium content typically varies depending on the state of charge of the battery.
• the positive active material can comprise other oxygen-containing materials, such as an oxide, manganate, nickelate, vanadate, phosphate, or fluorophosphate.
• the electrolyte comprises a molten salt.
• the molten salt may have a trifluorosulfonylimide anion, or derivative thereof.
• the electrolyte may further include a source of lithium ions, such as a lithium salt.
• a high voltage positive active material allows greater energy densities to be achieved than for conventional batteries.
• anode is conventionally used for the negative electrode
• cathode is conventionally used for the positive electrode.
• Examples of the present invention include an improved Li-ion battery having a positive electrode including a high voltage positive active material having an electrochemical potential of at least 4V versus Li, and preferably greater than approximately 4.5V versus Li.
• An example battery comprises a negative electrode, a positive electrode, and an electrolyte, the electrolyte containing a molten salt and a lithium salt.
• the molten salt electrolyte can provide one or more of the following properties: high stability against oxidation, and high ionic conductivity for lithium ions.
• a Li-ion battery with a molten salt electrolyte and a high voltage positive electrode allows development of a high energy/power density Li-ion battery.
• molten salt electrolytes with FSI (fluorosulfonylimide) anion have very high ionic conductivity, and so can provide improved performance, such as higher power and energy.
• An improved battery system includes a high voltage positive electrode and a molten salt electrolyte that comprises, for example, an FSI anion (fluorosulfonylimide or derivative thereof).
• the cation species of the molten salt can be, for example, a quaternary ammonium or ternary sulfonium.
• Example molten salt electrolytes include diethyl-methyl-sulfonium (DEMS) FSI, methyl-propyl-pyridinium (MPP) FSI, dimethyl- ethyl-imidazolium FSI 5 electrolytes having other imidazolium or pyridinium based anions including alkyl derivatives thereof, and the like.
• Figure IA shows an example Li-ion battery structure.
• the cell has a first electron collector 10, negative electrode 12, electrolyte layers 14 and 18, separator 16, positive electrode 20, and second electron collector 22.
• Figure IB shows a possible structure of the positive electrode, including particles of high potential positive active material 42, electron conductive material 44 (particles illustrated with thick edge lines), and electrolyte in the inter-particle gaps 46.
• the positive electrode may also include a binder on outer surfaces (such as 48) of the particles.
• the particles of electron conductive material may comprise electrically-conducting carbon or other electrically conducting material, and may present a surface layer comprising a barrier material which induces reduced electrolyte decomposition compared with that of a carbon surface.
• the positive active material (or cathode material) has a potential of between approximately 4.0 and the decomposition voltage of the molten salt electrolyte.
• Positive active potentials of up to 5.5 V may be achieved using materials such as LiNiPO 4 , Li 2 NiPO 4 F, and Li 2 CoPO 4 F, as has been theoretically predicted.
• the positive electrode includes a high voltage positive material as the positive active material, such as Li 2 NiMn 3 O 8 , LiNiVO 4 , LiCoVO 4 , LiCoPO 4 and the like.
• a positive electrode can include a positive active material, a binder material, and an electron conductive material such as Acetiren Black.
• the positive active material can be a lithiated transition metal compound such as an oxide (such as a manganate, nickelate, vanadate, cobaltate, titanate, or other compound such as other mixed transition metal oxides), a lithium mixed metal compound, and the like.
• a lithiated transition metal compound such as an oxide (such as a manganate, nickelate, vanadate, cobaltate, titanate, or other compound such as other mixed transition metal oxides), a lithium mixed metal compound, and the like.
• the binder material may include one or more of following compounds (or a mixture thereof): PVdF, PVdF-HFP, PTFE 5 PEO, PAN, CMC, SBK, and the like. These and other examples are described more fully below.
• the negative active material can comprise Li-foil, Li 4 Tis0 12 , Si, Sn, Li/Al-alloy,
• Wood-metal (a eutectic alloy of Bi-Pb-Cd-Sn with composition is 50: 25: 12.5: 12.5 weight %), other materials forming intermetallic compounds with lithium, and the like.
• the negative electrode may include a negative active material, a binder material (such as PVdF, PVdF-HFP, PTFE, PEO, PAN, CMC, SBR, and the like), and an electron conductive material such as Acetiren Black.
• the electrolyte can comprise a molten salt (such as DEMS-FSI or MPP-FSI), and a lithium salt.
• the molten salt can include an onium, such as an ammonium, a phosphonium, an oxonium, a sulfonium, an amidinium, an imidazolium, a pyrazolium, and a low basicity anion, such as PF 6 " , BF 4 ' , CF 3 SO 3 " , (CF 3 SO 2 )N ' , (FSO 2 ) 2 N " .
• an onium such as an ammonium, a phosphonium, an oxonium, a sulfonium, an amidinium, an imidazolium, a pyrazolium, and a low basicity anion, such as PF 6 " , BF 4 ' , CF 3 SO 3 " , (CF 3 SO 2 )N ' , (FSO 2 ) 2 N " .
• the molten salt electrolyte may also include Y 4 TSf " (-SO 2 Rf 2 )(-XRf 3 ), where Y + is a cation selected from the group consisting of an imidazolium ion, an ammonium ion, a sulfonium ion, a pyridinium, a(n) (iso)thiazolyl ion, and a(n) (iso) oxazolium ion, which may be optionally substituted with C 1-10 alkyl or C 1-1O alkyl having ether linkage, provided that said cation has at least one substituent Of -CH 2 Rf 1 Or -OCH 2 Rf 1 (where Rf is C 1- J 0 polyfluoroalkyl); Rf 2 and Rf 3 are independently C 1-10 perfluorophenyl or may together be C 1-10 perfluoroalkylene; and X is -SO 2 - Or-CO-.
• the cation of the molten salt should have an oxidation potential at least approximately 0.5V above the cathode voltage.
• the lithium salt may be LiPF 6 , LiBF 4 , LiAsF 6 , LiClO 4 , LiSO 3 CF 3 , LiTFSI,
• LiBETI LiBETI, LiTSAC, LiB(CF 3 COO) 4 , and the like, or a mixture of lithium compounds.
• the separator may include micro-porous PE, PP or PE/PP-hybrid film, bonded- fiber fabric of PP, PET, or methyl cellulose, and the like.
• a positive active material paste was prepared by dispersing 85 parts by weight of Li 2 NiMn 3 O 8 and 10 parts by weight of carbon powder and 5 parts by weight of polyvinylidene fluoride in N-methylpyrrolidone, and was coated by the doctor blade method to form an active material thin film on aluminum sheet. The coating film was dried for 30 minutes in an oven at 8O 0 C.
• a negative active material paste was prepared by dispersing 85 parts by weight of Li 4 Ti 5 O 12 parts by weight of carbon powder and 5 parts by weight of polyvinylidene fluoride in N-methylpyrrolidone, and was coated by the doctor blade method to form an active material thin film on aluminum sheet. The coating film was dried for 30 minutes in an oven of 80 0 C.
• the positive electrode sheet, a micro-porous polypropylene film separator, and the negative electrode sheet were stacked, and placed in aluminum laminate pack. A certain amount of molten salt electrolyte was added in to the laminate pack.
• DEMS-FSI with lithium-bis 1 trifluoromethan-sulfonylimide (LiTFSI) was used as the molten salt electrolyte.
• the aluminum laminate pack was sealed in vacuum to give a soft package battery.
• Methyl-propyl-pyridinium-bis-fluoro-sulfonylimide (MPP-FSI) with lithium- bis- trifluoromethan-sulfonylimide (LiTFSI) was used as the molten salt electrolyte.
• MPP-FSI Methyl-propyl-pyridinium-bis-fluoro-sulfonylimide
• LiTFSI lithium- bis- trifluoromethan-sulfonylimide
• EMI-FSI Ethyl-methyl-imidazolium-bis-fluoro-sulfonylimide
• LiTFSI lithium- bis- trifluoromethan-sulfonylimide
• the batteries were charged and discharged under the following conditions: electric current density: 0.7 mA/cm ; charge-termination voltage: 3.5 V; and discharge-termination voltage: 1.5V, to determine the charge-discharge performance.
• FIG 3 shows the results for the batteries of Examples 1 and 2, and the reference battery.
• the example batteries provide excellent performance.
• the reference battery
• positive electrodes having positive active materials (cathode materials) with a potential in the range of approximately 4.0 to approximately 5.2 V provide excellent
• the positive active material has a potential of at least approximately 4.5 V, so as to further increase the power available.
• the positive active material preferably has a potential less than that at which the electrolyte decomposition is observed.
• the positive active material has a potential of between approximately 4.5 V and 5.2 V.
• Electron-conductive materials may comprise substantially homogeneous particles formed from the barrier material, or may comprise an interior material having a coating of the barrier material.
• the interior material may comprise electrically conductive carbon such as carbon black, or in other examples metals having a high electrical conductivity such as platinum (Pt), tungsten (W), aluminum (Al), copper (Cu) and silver (Ag), metal oxides such as Tl 2 O 3 , WO 2 and Ti 4 O 7 , and metal carbides such as WC, TiC and TaC.
• Such barrier materials include oxides of at least one metal in group 4 to 14 of the periodic table.
• the barrier material may comprise an oxide of at least one metal in group 4 to 6 of the periodic table.
• Examples of an element in such an oxide are elements in groups 4 to 6 of the periodic table (Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W).
• An example of such a metal oxide is a titanium oxide.
• Other examples are elements in groups 12 to 14 of the periodic table (such as Zn, Al, hi, Tl, Si, Sn).
• An example of such an oxide is an indium-tin oxide (ITO).
• an oxide constituting the barrier layer examples include SnO 2 , TiO 2 , Ti 4 O 7 , In 2 O 3 /SnO 2 (ITO), Ta 2 O 5 , WO 2 , Wi 8 O 49 , CrO 2 and Tl 2 O 3 . With these oxides, the oxidation number of the metal in the oxide is relatively high, and hence the resistance to oxidation is good. Moreover, other preferable examples of an oxide constituting the barrier layer include MgO, BaTiO 3 , TiO 2 , ZrO 2 , Al 2 O 3 , and SiO 2 . These oxides have excellent electrochemical stability.
• the barrier material may comprise a carbide of at least one metal in group 4 to 14 of the periodic table, for example, a carbide of at least one metal in group 4 to 6 of the periodic table (Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W).
• a metal carbide include a titanium carbide (e.g. TiC) and a tantalum carbide (e.g. TaC).
• Specific examples of such a carbide are carbides represented by the formula MC (M is selected from Ti, Zr, Hf, V, Nb, Ta, Mo and W) and carbides represented by the formula M 2 C (M is selected from V, Ta, Mo and W).
• Other examples include metal phosphides such as Ni 2 P 3 , Cu 2 P 3 , and FeP.
• barrier materials were shown to reduce molten salt electrolyte decomposition using a Li 2 NiMn 3 O 8 high voltage cathode material, as described in U.S. provisional patent application Serial No. 60/614,517.
• the barrier material may comprise a nitride of at least one element in groups 2 to
• an element in such a nitride being elements in groups 4 to 6 of the periodic table (Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W).
• the barrier material may also comprise tungsten.
• a battery according to an embodiment of the present invention comprises a positive electrode including a positive active material, a negative electrode including a negative active material, and an electrolyte, the electrolyte comprising a molten salt, wherein the positive active material has an electrochemical potential of at least approximately 4.0 volts relative to lithium and more preferably 4.5 V relative to lithium.
• the positive electrode further comprises an electron conducting material that does not induce substantial decomposition of the electrolyte.
• an electron conducting material that does not induce substantial decomposition of the electrolyte.
• this may be a graphitic carbon-based material, such as carbon black.
• the carbon-based electron conducting material can be readily replaced with a barrier material as described above, for example using particles having a carbon based or other interior and a barrier layer coating.
• molten salt electrolyte is used herein to represent an electrolyte including one or more molten salts as a significant component of the electrolyte, for example more than 50% of the electrolyte.
• a molten salt electrolyte is an electrolyte comprising one or more salts, that is at least in part molten (or otherwise liquid) at the operating temperatures of the battery.
• a molten salt electrolyte can also be described as a molten, non-aqueous electrolyte, as an aqueous solvent is not required, or as an ionic liquid.
• Molten salt electrolytes which may be used in embodiments of the invention are described in U.S. Pat. Nos. 4,463,071 to Gifford, 5,552,241 to Mamantov et al., 5,589,291 to Carlin et al., 6,326,104 to Caja et al., 6,365,301 to Michot, and 6,544,691 to Guidotti.
• Example molten salts include those having an aromatic cation (such as an imidazolium salt or a pyridinium salt), an aliphatic quaternary ammonium salt, or a sulfonium salt.
• the molten salt electrolyte in the invention may include an onium, such as an ammonium, a phosphonium, an oxonium, a sulfonium, an amidinium, an imidazolium, a pyrazolium, and an anion, such as PF 6 “ , BF 4 " , CF 3 SO 3 " , (CF 3 SO 2 ) 2 N ⁇ (FSO 2 ) 2 N “ , (C 2 F 5 SOz) 2 N “ , CI " and Br .
• an onium such as an ammonium, a phosphonium, an oxonium, a sulfonium, an amidinium, an imidazolium, a pyrazolium
• an anion such as PF 6 “ , BF 4 " , CF 3 SO 3 " , (CF 3 SO 2 ) 2 N ⁇ (FSO 2 ) 2 N “ , (C 2 F 5 SOz) 2 N “ , CI "
• a molten salt electrolyte used in an example of the present invention may include Y + NX-SO 2 Rf 2 X-XRf 3 ), where Y + is a cation selected from the group consisting of an imidazolium ion, an ammonium ion, a sulfonium ion, a pyridinium, a(n) (iso)thiazolyl ion, and a(n) (iso) oxazolium ion, which may be optionally substituted with C MO alkyl or Ci -10 alkyl having ether linkage, provided that said cation has at least one substituent of - CH 2 Rf 1 or -OCH 2 Rf 1 (where R ⁇ is C 1-10 polyfluoroalkyl); Rf 2 and Rf 3 are independently C 1-10 perfluorophenyl or may together from C 1-1O perfluoroalkylene; and X is -SO 2 - or - CO-.
• Molten salts include salts having an aromatic cation (such as an imidazolium salt or a pyridinium salt), aliphatic quaternary ammonium salts, and sulfonium salts.
• Imidazolium salts include salts having a dialkylimidazolium ion, such as a dimethylimidazolium ion, an ethylmethylimidazolium ion, a propylmethylimidazolium ion, a butylmethylimidazolium ion, a hexylmethylimidazolium ion or an octylmethylimidazolium ion, or a trialkylimidazolium ion such as a 1,2,3- trimethylimidazolium ion, a l-ethyl-2,3-dimethylimidazolium ion, a l-butyl-2,3- dimethylimidazolium ion or a l-hexyl-2,3-dimethylimidazolium ion.
• a dialkylimidazolium ion such as a dimethylimidazolium i
• Imidazolium salts include ethylmethylimidazolium tetrafluoroborate (EMI-BF 4 ), ethylmethylimidazolium trifluoromethanesulfonylimide (EMI-TFSI), propylmethylimidazolium tetrafluoroborate, l,2-diethyl-3-methylimidazolium trifluoromethanesulfonylimide (DEMI-TFSI), and 1 ,2,4-triethyl-3 -methylimidazolium trifluoromethanesulfonylimide (TEMI-TFSI) .
• EMI-BF 4 ethylmethylimidazolium tetrafluoroborate
• DEMI-TFSI ethylmethylimidazolium trifluoromethanesulfonylimide
• TEMI-TFSI 1 ,2,4-triethyl-3 -methylimidazolium trifluo
• Pyridinium salts include salts having an alkyl pyridinium ion, such as a 1- ethylpyridinium ion, a 1-butylpyridinium ion or a 1-hexylpyridinium ion.
• Pyridinium salts include 1-ethylpyridinium tetrafluoroborate and 1-ethylpyridinium trifluoromethanesulfonylimide.
• Ammonium salts include trimethylpropylammonium trifluoromethanesulfonylimide (TMPA-TFSI), diethylmethylpropylammonium trifluoromethanesulfonylimide, and 1 -butyl- 1-methylpyrrolidinium trifluoromethanesulfonylimide.
• Sulfonium salts include triethylsulfonium trifluoromethanesulfonylimide (TES-TFSI).
• Lithium salts in the electrolyte of a lithium-ion battery may include one or more of the following: LiPF 6 , LiAsF 6 , LiSbF 6 , LiBF 4 , LiClO 4 , LiCF 3 SO 3 , Li(CF 3 SO 2 ) 2 N, Li(C 2 F 5 SO 2 ) 2 N, LiC 4 F 9 SO 3 , Li(CF 3 SO 2 ) 3 C, LiBPh 4 , LiBOB (lithium bis(oxalato)borate), and Li(CF 3 SO 2 )(CF 3 CO)N, and the like.
• Examples of the present invention can include rechargeable batteries using ions other than lithium, such as other alkali metal or other cation based batteries, in which case an appropriate salt is used.
• the molten salt of a potassium-ion battery may include KPF 6 or other potassium-ion providing compound.
• the positive active material can be a material allowing reversible cation insertion and release thereof.
• the positive active material can be a lithium composite oxide, such as a lithium metal oxide (an oxide of lithium and at least one other metal species).
• Example lithium composite oxides include Li-Ni-containing oxides, Li-Mn-containing oxides, Li-Co-containing oxides, other lithium transition metal oxides, lithium metal phosphates (such as LiCoPO 4 and fluorinated lithium metal phosphates), and other lithium metal chalcogenides, where the metal is, for example, a transition metal.
• Lithium composite oxides include oxides of lithium and one or more transition metals, and oxides of lithium and one or more metals selected from the group consisting of Co, Al, Mn, Cr, Fe, V, Mg, Ti, Zr, Nb, Mo, W, Cu, Zn, Ga, In, Sn, La and Ce.
• the positive active material may by nanostructured, for example in the form of nanoparticles having a mean diameter less than one micron.
• the negative electrode can comprise a negative active material, and (optionally) an electron conductive material and a binder.
• the negative electrode may be formed in electrical communication with a negative electrode electron collector.
• the negative active material may be carbon based, such as graphitic carbon and/or amorphous carbon, such as natural graphite, mesocarbon microbeads (MCMBs), highly ordered pyrolytic graphite
• the negative electrode may be a lithium titanium oxide, such as Li 4 Ti 5 O 12 .
• Rechargeable batteries include those based on any cation that can be reversibly stored (for example, inserted or intercalated) and released.
• Cations may include positive ions of alkali metals such as lithium, sodium, potassium, and cesium; alkaline earth metals such as calcium and barium; other metals such as magnesium, aluminum, silver and zinc; and hydrogen.
• cations may be ammonium ions, imidazolium ions, pyridinium ions, phosphonium ions, sulfonium ions, and derivatives thereof, such as alkyl or other derivatives of such ions.
• a battery according to an embodiment of the present invention comprises a negative electrode, a positive electrode, and a molten salt electrolyte, where the electrolyte is electrically conductive to cations of X, but not of electrons, the negative electrode includes a negative active material which can reversibly store (e.g. intercalate) cations of X (or which may comprise a layer of X), and a positive active material having an electrochemical potential of approximately 4.5 V or greater relative to X.
• a negative active material which can reversibly store (e.g. intercalate) cations of X (or which may comprise a layer of X)
• a positive active material having an electrochemical potential of approximately 4.5 V or greater relative to X.
• Electron conductive materials which may be used in electrodes of batteries according to examples of the present invention may comprise a carbon-containing material, such as graphite.
• Other example electron-conductive materials include polyaniline or other conducting polymer, carbon fibers, carbon black (or similar materials such as acetylene black, or Ketjen black), and non-electroactive metals such as cobalt, copper, nickel, other metal, or metal compound.
• the electron conducting material may be in the form of particles (as used here, the term includes granules, flakes, powders and the like), fibers, a mesh, sheet, or other two or three-dimensional framework.
• Electron conductive materials also include non-graphitic materials, which can help reduce electrolyte decomposition.
• non-graphitic electron conducting materials include oxides such as SnO 2 , Ti 4 O 7 , In 2 O 3 /SnO 2 (ITO), Ta 2 O 5 , WO 2 , W 18 O 49 , CrO 2 and Tl 2 O 3 , carbides represented by the formula MC (where M is a metal, such as WC, TiC and TaC), carbides represented by the formula M 2 C, metal nitrides, and metallic tungsten.
• An electron conducting particle may include a conducting core, and a coating chosen to reduce or eliminate decomposition of the electrolyte, for example as disclosed in our co- pending U.S. patent application Serial No. 11/080,617.
• An example battery may further include electrical leads and appropriate packaging, for example a sealed container providing electrical contacts in electrical communication with the first and second current collectors.
• An electron collector also known as a current collector, can be an electrically conductive member comprising a metal, conducting polymer, or other conducting material.
• the electron collector may be in the form of a sheet, mesh, rod, or other desired form.
• an electron collector may comprise a metal such as Al, Ni, Fe, Ti, stainless steel, or other metal or alloy.
• the electron collector may have a barrier layer to reduce corrosion, for example a barrier layer comprising tungsten (W), platinum (Pt), titanium carbide (TiC), tantalum carbide (TaC), titanium oxide (for example, TiO 2 or Ti 4 O 7 ), copper phosphide (Cu 2 P 3 ), nickel phosphide (Ni 2 P 3 ), iron phosphide (FeP), and the like, or may comprise particles of such materials.
• a barrier layer comprising tungsten (W), platinum (Pt), titanium carbide (TiC), tantalum carbide (TaC), titanium oxide (for example, TiO 2 or Ti 4 O 7 ), copper phosphide (Cu 2 P 3 ), nickel phosphide (Ni 2 P 3 ), iron phosphide (FeP), and the like, or may comprise particles of such materials.
• a barrier layer comprising tungsten (W), platinum (Pt), titanium carbide (TiC), tantalum carbide (Ta
• improved batteries according to embodiments of the present invention may have organic solvent based electrolytes and high voltage positive electrodes (high voltage cathodes).
• One or both electrodes may further include a binder.
• the binder may comprise one or more inert materials, for the purpose of improving the mechanical properties of the electrode, facilitating electrode manufacture or processing, or other purpose.
• Example binder materials include polymers, such as polyethylene, polyolef ⁇ ns and derivatives thereof, polyethylene oxide, acrylic polymers (including polymethacrylates), synthetic rubber, and the like.
• Binders also include fluoropolymers such as polyvinylidene fluoride (PVdF), polytetrafluoroethylene (PTFE), poly(vinylidene fluoride-hexafluoropropylene) copolymers (PVDF-HFP), and the like.
• Binder materials may include PEO (poly(ethylene oxide), PAN (polyacrylonitrile), CMC (carboxy methyl cellulose), SBR (styrene- butadiene rubber), or a mixture of compounds, including composite materials, copolymers, and the like.
• An adhesion promoter can be further be used to promote adhesion of an electrode to an electron collector.
• a battery may comprise a separator between the positive and negative electrodes.
• Batteries may include one or more separators, located between the negative electrode and positive electrode for the purpose of preventing direct electrical contact (a short circuit) between the electrodes.
• a separator can be an ion-transmitting sheet, for example a porous sheet, film, mesh, or woven or non-woven cloth, fibrous mat (cloth), or other form. The separator is optional, and a solid electrolyte may provide a similar function.
• a separator may be a porous or otherwise ion-transmitting sheet, including a material such as a polymer (such as polyethylene, polypropylene, polyethylene terephthalate, methyl cellulose, or other polymer), sol-gel material, ormosil, glass, ceramic, glass-ceramic, or other material.
• a separator may be attached to a surface of one or both electrodes.

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• 2005
  • 2005-08-31 US US11/216,555 patent/US20060088767A1/en not_active Abandoned
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