USRE41886E1 - Nonaqueous electrochemical cell with improved energy density - Google Patents
Nonaqueous electrochemical cell with improved energy density Download PDFInfo
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- USRE41886E1 USRE41886E1 US11/707,855 US70785507A USRE41886E US RE41886 E1 USRE41886 E1 US RE41886E1 US 70785507 A US70785507 A US 70785507A US RE41886 E USRE41886 E US RE41886E
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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
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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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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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
- H01M4/06—Electrodes for primary cells
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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
- H01M4/58—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
- H01M4/581—Chalcogenides or intercalation compounds thereof
- H01M4/5815—Sulfides
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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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
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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
- H01M4/381—Alkaline or alkaline earth metals elements
- H01M4/382—Lithium
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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
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/14—Cells with non-aqueous electrolyte
- H01M6/16—Cells with non-aqueous electrolyte with organic electrolyte
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- 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
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- This invention relates to a nonaqueous cell, such as a cell wherein lithium is the active anode material and iron disulfide or pyrite is the active cathode material. More particularly, this invention relates to such a cell wherein the anode to cathode input ratio is less than or equal to 1.0.
- Lithium metal possesses the lowest density of any metal and provides a volumetric energy density of 2062 mAh/cubic centimeter and a gravimetric energy density of 3861.7 mAh/gram. Pyrite offers advantageous energy opportunities as a result of its ability to undergo a four electron reduction, and has a volumetric energy density of 4307 mAh/cubic centimeter and a gravimetric energy density of 893.58 mAh/gram.
- lithium metal foil as the anode obviates the need for a discrete anode current collector, since the lithium foil is sufficiently conductive.
- lithium foil has a relatively low tensile strength and as a result can undergo stretching and thinning causing localized regions of reduced anode capacity. In a pronounced case, the thinning can be aggravated to the point of disconnects within the lithium anode.
- nonaqueous lithium/iron disulfide cell with an increased energy density and discharge efficiency that accommodates the volume increase of the reaction products generated during discharge.
- a nonaqueous cell having a dense cathode with good adhesion to the current collector substrate without sacrificing the uniformity of the cathode coating layer There is further a need for such a nonaqueous cell that reduces the anode to cathode cell balance without sacrificing the integrity of the anode.
- FIG. 1 is an illustration of an anode and a cathode and the interfacial electrode width.
- This invention relates to a nonaqueous cell comprising a lithium metallic foil anode and a cathode coating comprising iron disulfide as the active material wherein the coating is applied to at least one surface of a metallic substrate that functions as the cathode current collector.
- the cell of the within invention has improved performance on high rate discharge and is achieved, surprisingly, with an anode underbalance.
- the cell of the within invention has an anode to cathode input ratio, as defined herein, that is less than or equal to 1.0.
- the cathode coating formulation of the cell of the within invention is used in conjunction with a lithium metallic foil anode.
- the preferred anode is a lithium-aluminum alloy.
- the aluminum content by weight is preferably between 0.1 and 2.0 percent, and still more preferably is between 0.1 and 0.9 percent.
- the aluminum content of the lithium foil anode material is 0.5 percent.
- Such an alloy is available commercially from, by way of example, Chemetall Foote Corporation or FMC Corporation. We have found that the use of this alloyed material in conjunction with the cathode slurry formulation described below, enables the amount of lithium utilized in the cell to be minimized. The alloyed lithium results in an increase in tensile strength.
- the increase in tensile strength in the lithium aluminum alloy translates into a material stretch of less than 0.5 percent over a 12.0 inch initial electrode length. This in turn means that anode discontinuities along the length of the wound electrode strip are minimized, contributing to an improvement in overall cell performance.
- SEI solid electrolyte interface film
- the cathode slurry formulation of the cell of the within invention is novel and unique in that it enables the creation of a denser cathode, an anode to cathode input ratio of 1.0 or less and an increase in the cell energy density without sacrificing the discharge efficiency of the cell or the cathode integrity or the adhesion of the dried cathode slurry to the metallic foil substrate.
- the cathode slurry formulation we have discovered that proper selection of the conductive additives allows for a reduction in the amount of solvent utilized, resulting in a reduction of void volume in the final electrode coating and a denser cathode.
- the preferred cathode slurry formulation of the cell of the within invention comprises conductive carbon materials as additives.
- the conductive carbon additives comprise a mixture of synthetic graphite and acetylene black.
- highly crystalline synthetic graphite a synthetic graphite that is highly crystalline and possess an extreme anisotropic character to provide a powder with a moderate to low surface area and structure and that also has a high purity level.
- the moderate to low surface area and structure are characteristics of particular importance, as reflected in BET and DBP values as defined below, since we have discovered that carbons with higher surface areas and structures tend to retain solvent, ultimately contributing to coating defects.
- a suitable highly crystalline synthetic graphite has a maximum impurity or ash level of 0.1 percent, a mean particle size of 9 microns and a BET surface area of approximately 10 m 2 /gm and a n-dibutyl phthalate, or DBP oil absorption ratio of 190 percent as per ASTM D2414 and is available commercially from Timcal Graphite as Timrex MX-15.
- BET refers to ASTM D6556, which correlates surface area with multipoint nitrogen gas adsorption.
- a preferred highly crystalline synthetic graphite has an impurity level of 0.01 to 0.2 percent, a mean particle size of 3.0 to 11.0 microns, a BET surface area of 3.0 to 11.0 m 2 /gm and a DBP ratio of 160 to 200 percent.
- the acetylene black is preferably 55% compressed and is available commercially from, for example, Chevron under the product name acetylene black C55.
- the amount of conductive carbon additives is from 7.0 to 11.0 volume percent of the total solids content and still more preferably is from 10.0 to 10.5 volume percent of the total solids content.
- the “solids content” and the “solids percent” as used herein refers to the dry cathode coating formulation without consideration of the solvent, while the “wet content” and the “wet percent” refers to the cathode coating formulation taking into consideration the solvent used.
- the level of highly crystalline synthetic graphite should be maximized while the level of acetylene black should be minimized, to avoid undesired electrolyte retention that results in an increased difficulty in processing the electrode.
- the volume of highly crystalline synthetic graphite exceeds the volume of acetylene black, on both a wet and a dry or solids basis. Still more preferably, the volume of highly crystalline synthetic graphite is at least twice the volume of acetylene black, again on a wet and solids basis.
- the solids volume percent of highly crystalline synthetic graphite is between 7.0 and 7.5, while the solids volume percent of acetylene black is between 3.0 and 3.5. Still more preferably, the solids volume percent of highly crystalline synthetic graphite is 7.39 and the solids volume percent of acetylene black is 3.05.
- acetylene black is preferably from 1.0 to 3.0 percent
- highly crystalline synthetic graphite is preferably from 3.0 to 6.0 weight percent.
- the preferred cathode slurry formulation of the within invention further comprises at least one rheological modifier to aid in electrode processing.
- a cathode slurry comprising such a modifier with a high sensitivity to shear stress further enables the dense cathode and the anode to cathode input ratio of the cell of the within invention.
- Particularly desirable is an additive that will aid the slurry in retaining its viscosity while in an undisturbed state but will cause a drop in the slurry viscosity when the slurry is subjected to a relatively high shear such as can be encountered during the process of transferring the slurry from a holding tank to the electrode substrate.
- the preferred modifier further aids the slurry in returning to the relatively higher viscosity once the shear stress is removed.
- the preferred silica has a silanol group surface concentration of between 0.5 and 1.0 mmol/gm, and most preferably between 0.70 and 0.80 mmol/gm.
- the fumed silica preferably is added in an amount of from 0.2 to 0.6 weight percent of the solids incorporated into the slurry formulation, with a bulk density of from 35.0 to 50.0 gm/liter.
- a suitable fumed silica additive is available commercially from, for example, Degussa Corporation and is known as Aerosil 200, having a bulk density of 45.0 to 50.0 gms/liter.
- the fumed silica comprises 0.3 weight percent of the solids.
- micronized TEFLON® In the preferred cathode slurry formulation, micronized TEFLON®, or micronized polytetrafluoroethylene (PTFE) is incorporated as a slip agent.
- the micronized TEFLON® preferably has a mean particle size of 2.0 to 4.0 microns and a maximum particle size of 12.0 microns.
- the preferred micronized TEFLON® is easily dispersed in coating formulations and has been processed to a 1.0 to 1.5 NPIRI grind, where NPIRI stands for National Printing Ink Research Institute.
- Micronized TEFLON® is preferably incorporated from 0.2 to 0.6 weight percent of the total weight of the solids in the slurry, and still more preferably is added at 0.3 weight percent.
- a suitable preferred micronized TEFLON® is manufactured by MicroPowders Inc. and is available commercially from Dar-Tech Inc. under the name Fluo HT.
- the anode to cathode input ratio as used herein can be calculated as follows:
- Anode Capacity Per Linear Inch (foil thickness) ⁇ (interfacial electrode width) ⁇ 1 inch ⁇ (density of lithium foil at 20° C.) ⁇ (lithium energy density, 3861.7 mAh/gm).
- Cathode Capacity Per Linear Inch (final cathode coating thickness) ⁇ (interfacial electrode width) ⁇ 1 inch ⁇ (cathode dry mix density) ⁇ (final cathode packing percentage) ⁇ (dry weight percent FeS 2 ) ⁇ (percent purity FeS2) ⁇ (FeS 2 energy density, 893.58 mAh/gm)
- Interfacial electrode width is the linear dimension that shares an interfacial area between the cathode and the anode. An example is illustrated in FIG. 1 , where the dimension labeled “A” is the interfacial electrode width.
- “Final cathode coating thickness” refers to the coating thickness after any calendering operation or other densification processing of the cathode.
- “Final cathode packing percentage” refers to the solid volume percentage after any calendering operation or other densification processing and is equivalent to 100 percent less the void volume percentage after any calendering operation or other densification processing of the cathode.
- the “cathode dry mix density” refers to the additive density of the solid components of the cathode coating.
- a preferred polymer binder for the cathode coating of the cell of the within invention is a styrene-ethylene/butylene-styrene (SEBS) block copolymer.
- SEBS styrene-ethylene/butylene-styrene
- One such suitable block copolymer is available commercially from Kraton Polymers of Houston, Tex. as Kraton G1651.
- the preferred solvent for use with such a binder is stabilized 1,1,2-trichloroethylene.
- One of skill in the art will appreciate that other combinations of binders and/or solvents may be utilized in the cathode coating of the cell of the within invention without departing from the scope of the within invention
- An electrochemical cell comprising lithium as the active anode material and pyrite as the active cathode material is constructed as follows.
- a continuous strip of lithium metal foil 0.006 inches thick by 1.535 inches wide and alloyed at 0.5 weight percent with aluminum is provided.
- An aluminum cathode current collector continuous strip 0.001 inches thick by 1.72 inches wide is provided.
- the aluminum cathode collector strip is full hard standard alloy 1145-H19 aluminum and both surfaces are flame cleansed to remove oils and improve adhesion of the coating to the substrate surface.
- a cathode coating slurry is prepared using the following solids:
- the anode, cathode and a suitable separator are wound together from continuous webs into an electrode assembly with an overwrap on the exterior of the jelly roll and disposed within a can or other suitable container.
- a plastic insulating disc is punched and placed into each can initially.
- Automatic winders initiate the jellyroll with separator, followed by the cathode.
- the anode is introduced into the winder after the cathode and the jellyroll is formed to predetermined electrode lengths based on the location of the anode tab.
- the winder feed stock is separated from the web and an overwrap film is introduced into the winder at the trail end of the jellyroll and wound over the jellyroll until a predetermined jellyroll diameter is obtained.
- the wrap is cut and heat sealed, the cathode collector is crimped and the jellyroll is inserted into the container.
- the can is swaged to reduce its diameter prior to electrolyte filling.
- the anode tab is a 0.002 inch thick nickel plated steel foil tab that is pressure bonded to the lithium foil web at predetermined intervals corresponding to the predetermined prewind anode length of 12.00 inches and is bent over the completed jellyroll prior to insertion of the jellyroll into the can.
- the separator is a 25 micron thick polypropylene material available from Celgard Corporation as Celgard 2400.
- the can is nickel plated steel with an outer diameter of 0.548 inches and the jellyroll finished diameter is 0.525 inches.
- the outer wrap is a polypropylene film.
- the electrolyte is 1.6 grams of 63.05 weight percent 1,3 dioxolane, 27.63 weight percent 1,2 dimethoxyethane, 0.18 weight percent 3,5 dimethylisoxazole, and 9.14 weight percent lithium iodide.
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Abstract
Description
(foil thickness)×(interfacial electrode width)×1 inch×(density of lithium foil at 20° C.)×(lithium energy density, 3861.7 mAh/gm).
Cathode Capacity Per Linear Inch:
(final cathode coating thickness)×(interfacial electrode width)×1 inch×(cathode dry mix density)×(final cathode packing percentage)×(dry weight percent FeS2)×(percent purity FeS2)×(FeS2 energy density, 893.58 mAh/gm)
Anode/cathode input ratio-anode capacity per linear inch/cathode capacity per linear inch
Material | Weight percent (dry) | cm3/100 gms |
FeS2 | 92.0 | 19.087 | |
Acetylene black | 1.4 | 0.733 | |
Highly crystalline | 4.0 | 1.777 | |
synthetic graphite | |||
Formed silica | 0.3 | 0.136 | |
Micronized PTFE | 0.3 | 0.136 | |
Kraton | 2.0 | 2.198 | |
24.067 | cm3/100 gms | ||
4.155 | gm/cm3 | ||
(0.0063 in.)(1.535 in.)(1.0 in.)(16.387 cm3/in3) (4.1555 gm/cm3)(0.64 solids packing) (0.92) (0.95)(893.58 mAh/gm )=329 mAh/linear inch
Anode capacity per linear inch:
(0.006 in.)(1.535 in.)(1.0 in.)(16.387 cm3/in3)(0.534 gm/cm3)(3861.7 mAh/gm)=311 mAh/linear inch
The resulting anode to cathode input ratio is 311/329=0.95.
Claims (65)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/707,855 USRE41886E1 (en) | 2002-06-05 | 2007-02-16 | Nonaqueous electrochemical cell with improved energy density |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US10/164,239 US6849360B2 (en) | 2002-06-05 | 2002-06-05 | Nonaqueous electrochemical cell with improved energy density |
US10/977,775 US7157185B2 (en) | 2002-06-05 | 2004-10-29 | Nonaqueous electrochemical cell with improved energy density |
US11/707,855 USRE41886E1 (en) | 2002-06-05 | 2007-02-16 | Nonaqueous electrochemical cell with improved energy density |
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US10/977,775 Reissue US7157185B2 (en) | 2002-06-05 | 2004-10-29 | Nonaqueous electrochemical cell with improved energy density |
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US10/164,239 Expired - Lifetime US6849360B2 (en) | 2002-06-05 | 2002-06-05 | Nonaqueous electrochemical cell with improved energy density |
US10/977,775 Ceased US7157185B2 (en) | 2002-06-05 | 2004-10-29 | Nonaqueous electrochemical cell with improved energy density |
US11/707,855 Expired - Lifetime USRE41886E1 (en) | 2002-06-05 | 2007-02-16 | Nonaqueous electrochemical cell with improved energy density |
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US10/164,239 Expired - Lifetime US6849360B2 (en) | 2002-06-05 | 2002-06-05 | Nonaqueous electrochemical cell with improved energy density |
US10/977,775 Ceased US7157185B2 (en) | 2002-06-05 | 2004-10-29 | Nonaqueous electrochemical cell with improved energy density |
Country Status (12)
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US (3) | US6849360B2 (en) |
EP (3) | EP1518287B1 (en) |
JP (2) | JP5134761B2 (en) |
KR (1) | KR101016255B1 (en) |
CN (2) | CN1659729A (en) |
AT (1) | ATE396506T1 (en) |
AU (1) | AU2003274381A1 (en) |
CA (1) | CA2487539C (en) |
DE (1) | DE60321176D1 (en) |
ES (1) | ES2302942T3 (en) |
HK (1) | HK1075328A1 (en) |
WO (1) | WO2003105255A2 (en) |
Cited By (2)
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WO2012135171A1 (en) | 2011-03-28 | 2012-10-04 | Eveready Battery Company, Inc. | Lithium-iron disulfide cell design |
WO2013006328A1 (en) | 2011-07-01 | 2013-01-10 | Eveready Battery Company, Inc. | Particle size distribution variations in iron disulfide cathodes |
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US20050084756A1 (en) | 2005-04-21 |
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US6849360B2 (en) | 2005-02-01 |
HK1075328A1 (en) | 2005-12-09 |
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US20030228518A1 (en) | 2003-12-11 |
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ATE396506T1 (en) | 2008-06-15 |
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WO2003105255A3 (en) | 2004-11-04 |
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EP2242135B1 (en) | 2020-04-15 |
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