WO2021177291A1 - Additif pour électrode de batterie secondaire - Google Patents

Additif pour électrode de batterie secondaire Download PDF

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Publication number
WO2021177291A1
WO2021177291A1 PCT/JP2021/007915 JP2021007915W WO2021177291A1 WO 2021177291 A1 WO2021177291 A1 WO 2021177291A1 JP 2021007915 W JP2021007915 W JP 2021007915W WO 2021177291 A1 WO2021177291 A1 WO 2021177291A1
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Prior art keywords
electrode
carbon
secondary battery
additive
carbon material
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PCT/JP2021/007915
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English (en)
Japanese (ja)
Inventor
偉 毛
克之 福谷
暁明 夏
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国立大学法人 東京大学
日本水素株式会社
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Application filed by 国立大学法人 東京大学, 日本水素株式会社 filed Critical 国立大学法人 東京大学
Priority to JP2022504389A priority Critical patent/JPWO2021177291A1/ja
Priority to CN202180018868.2A priority patent/CN115210913A/zh
Publication of WO2021177291A1 publication Critical patent/WO2021177291A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
    • 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
    • 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
    • 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
    • H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • 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
    • 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 an additive for an electrode of a secondary battery, and more specifically, an additive for an electrode for suppressing a decrease in conductivity of a secondary battery under low temperature operation.
  • Lithium-ion batteries which are secondary batteries, are expected to be used as large storage batteries for electric vehicles and electric power storage, in addition to small portable devices such as mobile phones and laptop computers.
  • high levels of battery capacity and charge / discharge cycle characteristics have been required. Therefore, improvements are being made to various battery components such as negative electrode materials, positive electrode materials, separators, and non-aqueous electrolytes (Patent Document 1 and the like).
  • the present inventors have used a particulate carbon material having specific properties as an electrode additive (particularly, a positive electrode additive) at ⁇ 20 ° C. It has been found that a decrease in conductivity of a secondary battery such as a lithium ion battery can be suppressed and good charge / discharge characteristics can be obtained in an extremely low temperature usage environment below the above, and the present invention has been completed. Further, they have also found that by further adding carbon nanomaterials such as carbon nanotubes (CNT) and graphene in addition to the above carbon materials, it is possible to more efficiently suppress a decrease in conductivity in a low temperature environment.
  • CNT carbon nanotubes
  • the present invention is an additive for an electrode for suppressing a decrease in conductivity of a secondary battery under low temperature operation in one embodiment, and has an average particle size of 20 to 50 nm; 750 to 800 m. It has a specific surface area in the range of 2 / g; is characterized by containing a particulate carbon material having an oxygen atom to carbon atom ratio (O / C) of 0.025 to 0.035 in the surface functional group.
  • O / C oxygen atom to carbon atom ratio
  • Additives for electrodes ⁇ 2> The electrode additive according to ⁇ 1> above, wherein the carbon material is surface-modified carbon black; ⁇ 3> Additive for electrode according to ⁇ 1> or ⁇ 2> above, further comprising carbon nanotube (CNT), graphene, or a combination thereof; and ⁇ 4> Weight ratio of carbon material to carbon nanotube to graphene.
  • the electrode additive according to ⁇ 3> above which is in the range of 80 to 90% by weight: 0 to 10% by weight: 0 to 10% by weight.
  • the present invention comprises a ⁇ 5> current collector and an active material layer formed on the current collector, and the active material layer is any one of the above ⁇ 1> to ⁇ 4>.
  • An electrode for a secondary battery which comprises the electrode additive according to the above; ⁇ 6> The electrode for a secondary battery according to ⁇ 5> above, which is a positive electrode; ⁇ 7> The electrode for a secondary battery according to claim 6, wherein the active material in the active material layer is a lithium-containing transition metal oxide; ⁇ 8> The secondary battery according to claim 8, wherein the secondary battery includes the electrode for the secondary battery according to any one of ⁇ 5> to ⁇ 7>above; and ⁇ 9> a lithium ion battery. ..
  • the present invention is a method for producing an additive for an electrode for suppressing a decrease in conductivity under low temperature operation of a ⁇ 10> secondary battery, in which a particulate carbon material is heated at 400 to 700 ° C.
  • the production method comprising a step, a step of treating the heated carbon material in an acidic aqueous solution, and a step of drying the obtained carbon material to obtain a surface-modified carbon material; ⁇ 11>
  • ⁇ 12> The production method according to ⁇ 10> or ⁇ 11> above, wherein the acidic aqueous solution is a nitric acid aqueous solution;
  • the present invention it is possible to suppress a decrease in conductivity of a secondary battery such as a lithium ion battery even in an extremely low temperature usage environment of less than ⁇ 20 ° C., and to obtain good charge / discharge characteristics close to normal temperature operation. Can be done. This makes it possible to solve charge / discharge defects when using power battery products (unmanned aerial vehicles, electric vehicles, robots, balance vehicles, etc.) in cold regions.
  • the electrode additive of the present invention since the electrode additive of the present invention has good dispersion, the conductivity, rate and cycle can be increased by a very small amount (for example, 1% or less) as compared with the conventional conductive agent. It also has the advantage that the properties can be improved.
  • FIG. 1 is a graph showing the particle size and pore size distribution of the electrode additive of the present invention.
  • FIG. 2 is an XPS chart of the electrode additive of the present invention.
  • FIG. 3 is an electron microscope image of the surface of the electrode containing the additive for the electrode of the present invention.
  • FIG. 4 is a graph showing a discharge curve when the temperature environment is changed in the range of 0 ° C. to ⁇ 35 ° C.
  • FIG. 5 is a graph showing a discharge curve when the temperature environment is changed to ⁇ 40 ° C.
  • FIG. 6 is a graph showing a discharge curve when the temperature environment is changed to ⁇ 50 ° C.
  • FIG. 7 is a graph showing charge / discharge curves at different rates.
  • FIG. 8 is a graph showing a charge / discharge cycle when LiFePO 4 is used as the active material.
  • FIG. 9 is a graph showing a charge / discharge cycle when a ternary system [Li (Ni—Mn—Co) O 2] is used as the active material.
  • FIG. 10 is a graph showing a charge / discharge cycle when LiMn 2 O 4 is used as the active material.
  • the additive for electrodes of the present invention is for suppressing a decrease in conductivity under low temperature operation of a secondary battery, and contains a particulate carbon material satisfying the following 1) to 3). It is characterized by that. 1) Have an average particle size of 20-50 nm; 2) Have a specific surface area in the range of 750 to 800 m 2 / g; 3) The ratio (O / C) of oxygen atom to carbon atom in the surface functional group is 0.025 to 0.035.
  • the surface-modified carbon material having conductivity has an appropriate balance between hydrophobicity and hydrophilicity, and the surface oxidation of the carbon material and the improvement of dispersibility by the high-speed vibration pulverization method are performed. It was found that the mixture was uniformly dispersed on the surface of the electrode and crosslinked with the active electrode material to form a three-dimensional network having a multi-branched structure. As a result, it is possible to suppress a decrease in the conductivity of the secondary battery even in an extremely low temperature usage environment, and it is possible to obtain good charge / discharge characteristics close to those during normal temperature operation. At the same time, such an effect can be obtained with a very small amount of addition (for example, 1% or less) as compared with the conventional conductive agent.
  • a very small amount of addition for example, 1% or less
  • carbon-based materials having various degrees of graphitization can be used, from graphitized materials to amorphous materials.
  • carbon black natural graphite, artificial graphite, hard carbon, soft carbon, Ketjen black, acetylene black, activated carbon and the like can be mentioned.
  • a carbon material having a small degree of graphitization is preferable, and carbon black is particularly preferable.
  • these carbon materials are preferably surface-modified so as to satisfy the above 1) to 3).
  • the carbon material is appropriately mixed with particles such as metal particles and metal oxide particles in any combination. Is also good. Further, a plurality of materials may be mixed in each particle. For example, carbonaceous particles having a structure in which the surface of graphite is coated with a carbon-based material having a low degree of graphitization can be used.
  • the average particle size of the carbon material used in the present invention can be 20 to 50 nm, preferably 25 to 45 nm. Thereby, the dispersibility in the solvent used at the time of manufacturing the electrode and the uniformity on the surface of the electrode can be made appropriate.
  • the average particle size can be measured by a known method using a commercially available laser diffraction / scattering type particle size distribution measuring device or the like.
  • the specific surface area of the carbon material used in the present invention is in the range of 750 to 800 m 2 / g, preferably in the range of 760 to 780 m 2 / g. If the specific surface area is less than this range, the fast charging characteristics may be inferior, and if it exceeds the range, the initial irreversible capacity may become too large.
  • the specific surface area can be measured by using a known method and apparatus such as a nitrogen gas adsorption and flow method.
  • the carbon material used in the present invention has an oxygen atom to carbon atom ratio (O / C atom ratio) in the surface functional group in the range of 0.025 to 0.035, preferably 0.027 to 0.033.
  • the portion corresponding to the oxygen atom (O) is mainly derived from the OH group on the particle surface of the carbon material, and by setting the O / C atom ratio within such a range, it is hydrophobic and hydrophilic. It has an appropriate balance of, and can be dispersed in an organic solvent used as a solvent used when producing an electrode, or in a hydrophilic solvent such as water. In addition, it can be uniformly distributed on the electrode surface.
  • the O / C atomic ratio can be measured using X-ray photoelectron spectroscopy (XPS). For example, from the oxygen atom concentration obtained based on the peak area of the O1s spectrum (525 to 545 eV) in the XPS analysis and the carbon atom concentration obtained based on the peak area of the C1s spectrum (280 to 300 eV) in the XPS analysis. The O / C atomic ratio can be determined.
  • XPS X-ray photoelectron spectroscopy
  • the electrode additive of the present invention may further contain another carbon nanomaterial in addition to the above carbon material.
  • carbon nanomaterials include carbon nanotubes (CNTs), carbon nanofibers (CNFs), graphene, carbon nanohorns (CNH), fullerenes, or combinations thereof, or chemicals thereof. It may be a substance modified to. Preferably, it is carbon nanotube (CNT), graphene, or a combination thereof.
  • the method for producing these carbon nanomaterials is not particularly limited, and they can be produced by a conventionally known method, or commercially available ones can be used as they are.
  • Carbon nanotubes are generally materials having a tubular structure having a diameter of about several nm, in which one sheet-shaped graphite (graphene sheet) having a six-membered ring arrangement structure of carbon is wound in a cylindrical shape.
  • the "carbon nanotube” includes a single-walled carbon nanotube composed of one sheet of graphite and a multi-walled carbon nanotube (inside the carbon nanotube) in which a plurality of the tubular sheets are laminated in the direction perpendicular to the axis.
  • multi-walled carbon nanotubes containing one or more small-diameter carbon nanotubes carbon nanohorns having a conical and closed end of single-walled carbon nanotubes, carbon nanotubes containing fullerene inside, and the like are also included. These carbon nanotubes can be used alone or in combination of two or more.
  • the average diameter of the carbon nanotubes can be selected from, for example, 0.5 nm to 1 ⁇ m, preferably 1 to 100 nm, and in the case of single-walled carbon nanotubes. For example, it is about 0.5 to 10 nm, preferably about 1 to 5 nm, and in the case of multi-walled carbon nanotubes, it is, for example, about 5 to 300 nm, preferably about 10 to 100 nm.
  • the average length of carbon nanotubes is, for example, in the range of 1 to 1000 ⁇ m, preferably 5 to 500 ⁇ m.
  • the ratio with the carbon material can be appropriately adjusted from the viewpoint of desired conductivity and dispersibility.
  • the weight ratio of carbon material: carbon nanomaterial can be in the range of 80-90% by weight: 10-20% by weight.
  • the weight ratio of the carbon material, carbon nanotubes, and graphene in the electrode additive is 80 to 90% by weight: 0 to 10% by weight: 0. It is preferably in the range of ⁇ 10% by weight.
  • the electrode additive of the present invention can be used in either a powder form or a dispersion liquid form dispersed in a solvent.
  • the solvent in the case of the dispersion liquid can be an organic solvent, water, or a mixed solvent thereof.
  • carbon nanomaterials and carbon nanomaterials, if any
  • a dispersant such as a surfactant may be added to the dispersion liquid.
  • the present invention also relates to the method for manufacturing the additive for electrode, and the manufacturing method includes the following steps.
  • Step (a) is a step of firing the carbon material at a heating temperature of 400 to 700 ° C., preferably 500 to 650 ° C.
  • the step is preferably carried out in an atmosphere of an inert gas such as argon for 2 to 3 hours.
  • an inert gas such as argon
  • the carbon material used as a raw material carbon-based materials having various degrees of graphitization can be used as described above, and carbon black is preferable.
  • the method for producing the carbon material itself as a raw material is not particularly limited, and it can be produced by a conventionally known method, or a commercially available material can be used as it is.
  • Step (b) is a step of appropriately cooling the carbon material obtained in step (a) and then treating it in an acidic aqueous solution.
  • an acidic aqueous solution an aqueous solution of a strong acid such as nitric acid can be typically used.
  • the step (c) is a step of separating the carbon material from the acidic aqueous solution of the step (b) and drying it to obtain the target surface-modified carbon material.
  • a separation means known in the art such as filtration can be used.
  • the production method of the present invention can further include a step of mixing the surface-modified carbon material and any carbon nanomaterial after the above (c).
  • the types of such carbon nanomaterials are as exemplified above, but it is preferable to use carbon nanotubes (CNT), graphene, or a combination thereof.
  • the electrode additive containing the obtained surface-modified carbon material is in either a powder form or a dispersion liquid form dispersed in a solvent. Can also be used.
  • the present invention comprises a current collector and an active material layer formed on the current collector, wherein the active material layer is the above-mentioned electrode addition. It also relates to electrodes for secondary batteries, which are characterized by containing an agent. Preferably, the electrode is a positive electrode (anode).
  • the active material material in the active material layer a known material can be used depending on the type of the secondary battery.
  • the secondary battery is a lithium ion battery
  • an active material capable of storing and releasing lithium ions can be used.
  • the positive electrode active material contains lithium containing one or more transition metals such as lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMn 2 O 4 ), and lithium nickel oxide (LiNiO 2).
  • Lithium-containing polyanionic compounds containing one or more transition metals such as transition metal oxides, transition metal sulfides, metal oxides, lithium iron oxide (LiFePO 4 ) and lithium iron pyrophosphate (Li 2 FeP 2 O 7).
  • the active material is a lithium-containing transition metal oxide.
  • examples of the negative electrode active material include carbonaceous materials such as natural graphite (graphite), highly oriented pyrolytic graphite (HOPG), and amorphous carbon. Can be mentioned. These negative electrode active materials may be used alone or in combination of two or more.
  • the electrode can contain a binder, if necessary.
  • a binder for example, a fluororesin such as polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), or ethylene tetrafluoroethylene (ETFE), polyethylene, polypropylene, or the like can be used.
  • PVDF polyvinylidene fluoride
  • PTFE polytetrafluoroethylene
  • ETFE ethylene tetrafluoroethylene
  • polyethylene polypropylene, or the like
  • the electrode can be prepared by pulverizing and mixing the electrode additive of the present invention and the electrode active material material.
  • crushing / mixing is not particularly limited, but can be performed by using a crusher such as a vibration mill, a jet mill, or a ball mill.
  • a method of supporting the mixture on the current collector there is a method of pressure molding, or a method of pasting with an organic solvent, coating on the electrode current collector, drying and pressing to fix the mixture.
  • a slurry consisting of an electrode active material, an electrode additive, a binder, and an organic solvent is prepared.
  • the electrode active material can be coated with the electrode additive of the present invention.
  • a method of performing such coating a method of immersing the powder of the electrode active material in a liquid containing the electrode additive and then heat-treating the powder to deposit the electrode active material on the powder surface of the active material can be mentioned. Be done.
  • the present invention also relates to a secondary battery comprising electrodes for the secondary battery.
  • the secondary battery is preferably a non-aqueous secondary battery, more preferably a lithium ion battery.
  • the configuration of the secondary battery of the present invention is the same as that of a conventionally known lithium ion secondary battery, and usually includes a positive electrode and a negative electrode capable of storing and releasing lithium ions, a separator, and an electrolytic solution.
  • the positive electrode contains the additive for the electrode of the present invention.
  • the low temperature electrolyte is not particularly limited as long as it uses a lithium salt as an electrolyte.
  • electrolytes include, for example, those selected from LiPF 6 , LiBF 4 , LiClO 4 , LiNO 3 , LiCl, Li 2 SO 4 and Li 2 S and any combination thereof.
  • solvent in the electrolytic solution examples include propylene carbonate (PC), ethylene carbonate (EC), dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate, 4-trifluoromethyl-1,3-dioxolan-2- Carbonates such as on, 1,2-di (methoxycarbonyloxy) ethane; 1,2-dimethoxyethane, 1,3-dimethoxypropane, pentafluoropropylmethyl ether, 2,2,3,3-tetrafluoropropyldifluoro Ethers such as methyl ether, tetrahydrofuran and 2-methyltetraxyl; esters such as methyl formate, methyl acetate and ⁇ -butyrolactone; nitriles such as acetonitrile and butyronitrile; N, N-dimethylformamide, N, N-dimethylacetamide and the like. Amides of be able to. One of these
  • a solid electrolyte can be used instead of the electrolytic solution.
  • the solid electrolyte include polymer electrolytes such as polyethylene oxide-based polymer compounds and polymer compounds containing at least one polyorganosiloxane chain or polyoxyalkylene chain. It can also be used in the form of a non-aqueous gel electrolyte obtained by adding a polymer to the above electrolytic solution and gelling it.
  • the electrolytic solution may contain other components as necessary for the purpose of improving its function.
  • Other components include, for example, conventionally known overcharge inhibitors, dehydrating agents, deoxidizers, and property improving aids for improving capacity retention properties and cycle properties after high temperature storage.
  • the separator used in the secondary battery of the present invention is not particularly limited as long as it has a function of electrically separating the positive electrode layer and the negative electrode layer, but for example, polyethylene (PE) and polypropylene (PP). ), Porous sheets made of resins such as polyester, cellulose and polyamide, and porous insulating materials such as non-woven fabrics such as non-woven fabrics and glass fiber non-woven fabrics.
  • PE polyethylene
  • PP polypropylene
  • the shape of the secondary battery of the present invention is not particularly limited as long as it can store the positive electrode, the negative electrode, and the electrolytic solution, and examples thereof include a cylindrical type, a coin type, a flat plate type, and a laminated type. can.
  • Example 1 An additive containing only surface-modified carbon (Example 1) and an additive containing CNT and graphene in addition to the surface-modified carbon (Example 2) were obtained.
  • FIG. 1 shows a graph of particle size / pore size distribution. As a result, it was found that the additive of Example 1 had an average particle size of 35.6 nm, a specific surface area of 780 m 2 / g, and a primary particle size of 35.4 nm.
  • FIG. 2 shows an XPS chart obtained with the additive of Example 1.
  • Electrodes 1 Using the additive obtained in the above, a positive electrode was prepared by the following procedure. Active material (Li (Ni-Mn-Co) O 2 ) 94 wt.%, Conductive material (MEC380) 1 wt.%, Binder (PolyVinylidene DiFluoride (PVDF)) 5 wt. The paste kneaded with% was uniformly applied to the current collector (positive electrode: Al foil, negative electrode: Cu foil) by a doctor blade. Then, it was vacuum dried to remove the solvent.
  • Active material Li (Ni-Mn-Co) O 2
  • Conductive material MEC380
  • Binder PolyVinylidene DiFluoride (PVDF)
  • FIG. 3 An electron microscope image of the prepared electrode surface is shown in FIG. According to FIG. 3, it was found that the additive component of the present invention was uniformly dispersed on the electrode surface, and the electrode was completely covered. Further, it was found that the additive component of the present invention was strongly connected to the active material in the electrode and had a high degree of contact, and as a result, a three-dimensional network having a multi-branched structure was formed by cross-linking with each other.
  • Fig. 4 shows the discharge curve when the temperature environment is changed from 0 ° C to -35 ° C. As a result, it was confirmed that it operates normally even in a low temperature environment of ⁇ 35 ° C.
  • FIGS. 5 and 6 the discharge curves when the temperature environment is lowered to ⁇ 40 ° C. and ⁇ 50 ° C. are shown in FIGS. 5 and 6, respectively.
  • charging / discharging occupies 85% or more of the rated capacity at ⁇ 40 ° C. and 70% or more at ⁇ 50 ° C., and the lithium ion battery is normal even in an environment of ⁇ 50 ° C. by using the electrode containing the additive of the present invention. It was confirmed that it can be operated.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
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  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
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Abstract

Le problème décrit par la présente invention est de fournir : une batterie secondaire pouvant conserver de bonnes caractéristiques de batterie même lorsqu'elle est utilisée dans un environnement à température extrêmement basse ; et en particulier, un matériau d'électrode pour la batterie secondaire. La solution de l'invention porte sur un additif pour électrode apte à empêcher une diminution de conductivité lors du fonctionnement à basse température d'une batterie secondaire, l'additif étant caractérisé par l'inclusion d'un matériau carboné particulaire ayant un diamètre moyen de particules de 20 à 50 nm, une surface spécifique dans la plage allant de 750 à 800 m2/g, et un rapport (O/C) atomes d'oxygène sur atomes de carbone dans un groupe fonctionnel de surface compris entre 0,025 et 0,035.
PCT/JP2021/007915 2020-03-04 2021-03-02 Additif pour électrode de batterie secondaire WO2021177291A1 (fr)

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JP2022504389A JPWO2021177291A1 (fr) 2020-03-04 2021-03-02
CN202180018868.2A CN115210913A (zh) 2020-03-04 2021-03-02 二次电池电极用添加剂

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004103546A (ja) * 2002-07-15 2004-04-02 Mitsubishi Chemicals Corp 正極活物質複合化粒子、並びにそれを用いた電極及びリチウム二次電池
JP2011195761A (ja) * 2010-03-23 2011-10-06 Mitsubishi Chemicals Corp 難燃性ポリオレフィン樹脂組成物
JP2015230884A (ja) * 2014-06-06 2015-12-21 東洋インキＳｃホールディングス株式会社 蓄電デバイス用樹脂
JP2016096125A (ja) * 2014-05-19 2016-05-26 日本ケミコン株式会社 電極、この電極の製造方法、この電極を備えた蓄電デバイス、及び蓄電デバイス電極用の導電性カーボン混合物
WO2018221632A1 (fr) * 2017-06-01 2018-12-06 ライオン・スペシャリティ・ケミカルズ株式会社 Noir de carbone pour électrode et suspension épaisse d'électrode

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004103546A (ja) * 2002-07-15 2004-04-02 Mitsubishi Chemicals Corp 正極活物質複合化粒子、並びにそれを用いた電極及びリチウム二次電池
JP2011195761A (ja) * 2010-03-23 2011-10-06 Mitsubishi Chemicals Corp 難燃性ポリオレフィン樹脂組成物
JP2016096125A (ja) * 2014-05-19 2016-05-26 日本ケミコン株式会社 電極、この電極の製造方法、この電極を備えた蓄電デバイス、及び蓄電デバイス電極用の導電性カーボン混合物
JP2015230884A (ja) * 2014-06-06 2015-12-21 東洋インキＳｃホールディングス株式会社 蓄電デバイス用樹脂
WO2018221632A1 (fr) * 2017-06-01 2018-12-06 ライオン・スペシャリティ・ケミカルズ株式会社 Noir de carbone pour électrode et suspension épaisse d'électrode

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