WO2023113297A1 - 리튬 이차전지용 양극 제조장치, 이의 제조방법, 및 이를 포함하는 리튬 이차전지 - Google Patents
리튬 이차전지용 양극 제조장치, 이의 제조방법, 및 이를 포함하는 리튬 이차전지 Download PDFInfo
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- WO2023113297A1 WO2023113297A1 PCT/KR2022/018937 KR2022018937W WO2023113297A1 WO 2023113297 A1 WO2023113297 A1 WO 2023113297A1 KR 2022018937 W KR2022018937 W KR 2022018937W WO 2023113297 A1 WO2023113297 A1 WO 2023113297A1
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- positive electrode
- cathode
- secondary battery
- current collector
- lithium secondary
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 51
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 46
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- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 1
- VUPKGFBOKBGHFZ-UHFFFAOYSA-N dipropyl carbonate Chemical compound CCCOC(=O)OCCC VUPKGFBOKBGHFZ-UHFFFAOYSA-N 0.000 description 1
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- 150000003464 sulfur compounds Chemical class 0.000 description 1
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Images
Classifications
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- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- H01M10/0404—Machines for assembling batteries
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- 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
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- 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 apparatus for manufacturing a cathode for a lithium secondary battery, a method for manufacturing the same, and a lithium secondary battery including the same.
- lithium-sulfur secondary batteries use a sulfur-based compound having a sulfur-sulfur bond as a cathode active material, and an alkali metal such as lithium or a carbon-based material in which intercalation and deintercalation of metal ions such as lithium ion occurs, or an alloy with lithium. It is a secondary battery that uses silicon or tin, which forms a negative electrode, as an active material. Specifically, electrical energy is stored using an oxidation-reduction reaction in which sulfur-sulfur bonds are broken during discharge, which is a reduction reaction, and the oxidation number of sulfur decreases, and sulfur oxidation numbers are increased during charging, which is an oxidation reaction, and sulfur-sulfur bonds are re-formed. and create
- sulfur used as a cathode active material in lithium-sulfur secondary batteries has a theoretical energy density of 1,675 mAh/g, which is 5 times higher than that of the cathode active material used in conventional lithium secondary batteries, resulting in high power and high energy It is a battery capable of expressing density.
- sulfur is attracting attention as an energy source for medium and large-sized devices such as electric vehicles as well as portable electronic devices because of its low price, abundant reserves, easy supply and demand, and environmental friendliness.
- Sulfur has an electrical conductivity of 5x10 -30 S/cm and is an insulator with no electrical conductivity, so it is difficult to move electrons generated by electrochemical reactions. Accordingly, it is used as a sulfur-carbon composite by being composited with an electrically conductive material such as carbon capable of providing an electrochemical reaction site.
- a method of preparing a positive electrode through a slurry coating that is, a wet process, in which a slurry is prepared along with a conductive material and a binder and then the slurry is applied to a current collector is generally used.
- the positive electrode manufactured by such a wet process has a problem in that the energy density is also reduced because the loading amount of the positive electrode active material in the positive electrode is reduced due to the conductive material and the binder used when preparing the slurry.
- the positive electrode manufactured by a wet process there are problems due to moisture remaining in the positive electrode and additional costs due to mixing, coating, and drying processes.
- the fibrous binder powder is molded through a calendar rolling process, and at this time, since the rotation speed of the roll and the nip distance variable affect the loading and porosity of the anode at the same time, the manufacturing It can be difficult to independently control the in-process conditions for controlling the properties of the anode.
- Patent Document 1 Japanese Laid-open Patent No. 2014-078497
- the inventors of the present invention have conducted various studies to solve the above problems, and as a result, in an apparatus for manufacturing a positive electrode through a dry process, the positive electrode material supply unit for supplying the positive electrode material in powder form and the positive electrode material molding unit for pressurizing the positive electrode material are independently It is configured to operate, but by using pressure and temperature at the same time in the cathode material forming unit, it is possible to mold the anode without using a binder, and it is easy to control the loading and porosity of the anode during the manufacturing process of the anode. completed the present invention.
- an object of the present invention is to provide an apparatus and method for manufacturing a positive electrode for a lithium secondary battery by a dry process without using a binder.
- a cathode material supply unit supplying a powdered cathode material to one surface of the cathode current collector transported by the conveying means;
- a positive electrode manufacturing apparatus for a lithium secondary battery comprising: a positive electrode material molding unit for temporarily shaping, rolling, and bonding the positive electrode material in powder form supplied to one surface of the positive electrode current collector in the form of a positive electrode material layer;
- the positive electrode material forming unit includes a caustic roll, a rolling roll, and an adhesive roll arranged in a row,
- the temporary type, the rolling roll, and the adhesive roll each include a pair of rolls symmetrical to each other, and the conveying means is transferred in one direction between the pair of rolls, providing an apparatus for manufacturing a cathode for a lithium secondary battery.
- the present invention also includes (S1) supplying a powdered cathode material to one surface of the cathode current collector transported by the conveying means; (S2) a temporary shaping step of forming a layered cathode material layer by applying pressure to the powdered cathode material supplied to one surface of the cathode current collector and transferred in the step (S1); (S3) a rolling step of adjusting the porosity of the positive electrode material layer by applying pressure to the positive electrode current collector on which the positive electrode material layer is formed on one surface; and (S4) heating the positive electrode current collector on which the positive electrode material layer was rolled in step (S3) to bond the positive electrode material layer and the positive electrode current collector.
- a step (S5) of recovering the positive electrode material in powder form remaining on the positive electrode current collector after the bonding to the positive electrode material supply unit may be included.
- the steps (S1) to (S4) may be repeated twice, and the steps (S1) to (S4) may be sequentially performed.
- a positive electrode for a lithium secondary battery can be manufactured by a dry process without using a binder using an apparatus for manufacturing a positive electrode for a lithium secondary battery.
- the positive electrode material supply unit in the form of powder provided in the manufacturing apparatus of the positive electrode for lithium secondary battery and the positive electrode material forming unit for shaping, rolling, and bonding the positive electrode material supply unit are provided to operate independently, the loading amount of the positive electrode in the positive electrode material supply unit can be reduced. and the porosity of the positive electrode can be adjusted in the positive electrode material forming unit, so that the loading amount and porosity of the positive electrode can be independently adjusted in the manufacturing process of the positive electrode.
- the positive electrode material molding unit presses using an anode-shaped mold, the remaining positive electrode material powder that is not pressurized can be recovered and used again.
- FIG. 1 is a schematic diagram of an apparatus for manufacturing a cathode for a lithium secondary battery according to an embodiment of the present invention.
- dry process means a process that does not use a solvent.
- the present invention relates to an apparatus for manufacturing a positive electrode for a lithium secondary battery, and relates to an apparatus for manufacturing a positive electrode in a dry process without using a binder when manufacturing the positive electrode.
- FIG. 1 is a schematic diagram of an apparatus for manufacturing a cathode for a lithium secondary battery according to an embodiment of the present invention.
- a cathode material P in a powder state is disposed on one surface of a cathode current collector 50 transported by a transport means 30 moving in one direction.
- the reshaping unit 20 includes a temporary forming roll 21, a rolling roll 22 and an adhesive roll 23 arranged in a line.
- the temporary forming roll 21, the rolling roll 22, and the adhesive roll 23 each include a pair of symmetrical rolls, and the conveying means 30 is transferred in one direction between the pair of rollers.
- the device for manufacturing a cathode for a lithium secondary battery 1 is a cathode material (P) in a powder form remaining on the cathode current collector 50 after being temporarily molded, rolled, and bonded by the cathode material molding unit 20.
- a cathode material recovery unit 40 transferring to the supply unit 10 may be further included.
- the cathode manufacturing apparatus 1 for a lithium secondary battery While the cathode current collector 50 is transported in one direction by the transport means 30, the cathode material ( After P) is supplied, a series of processes in which the positive electrode 60 for a lithium secondary battery is manufactured by forming, rolling, and bonding by the positive electrode material forming unit 20 is a continuous process, so that process efficiency and productivity can be improved.
- the continuous process may also include a process of transferring the powdered cathode material P remaining by the cathode material recovery unit 40 to the cathode material supply unit 10 .
- the transfer means 30 transfers the positive electrode current collector 50 or the positive electrode current collector 50 coated with the positive electrode material P in one direction along a predetermined transfer path, so that the continuous process as described above can be performed.
- the conveying means 30 forms a conveying path for conveying the cathode current collector 50 in the direction of arrow A, and the conveying means 30 feeds the cathode material supply part 10 at a constant speed under the control of the driving unit. And it may be to sequentially pass through the positive electrode material forming unit 20 .
- the transfer means 30 is not particularly limited as long as it is a device capable of transferring an object to be transferred in the art.
- it may be a device that enables a roll-to-roll process, and the roll-to-roll process may use an unwinder and a rewinder to transfer the conveying means.
- the cathode current collector 50 supports the cathode active material layer 52 and is not particularly limited as long as it has high conductivity without causing chemical change in the battery.
- copper, stainless steel, aluminum, nickel, titanium, palladium, calcined carbon, copper or stainless steel surface treated with carbon, nickel, silver, etc., aluminum-cadmium alloy, etc. may be used.
- the positive electrode current collector 50 can form fine irregularities on its surface to enhance bonding strength with the positive electrode active material, and can be formed in various forms such as films, sheets, foils, meshes, nets, porous bodies, foams, and non-woven fabrics. can be used
- a primer coating layer 51 including a binder and a conductive material may be formed on the surface of the cathode current collector 50 .
- the primer coating layer 51 may serve to better bind the positive electrode material P in a powder state to the positive electrode current collector 50 .
- the binder is not particularly limited as long as it is a binder commonly used in the art.
- the binder may be a fluororesin-based binder including polyvinylidene fluoride (PVdF) or polytetrafluoroethylene (PTFE); rubber-based binders including styrene-butadiene rubber (SBR), acrylonitrile-butadiene rubber, and styrene-isoprene rubber; cellulosic binders including carboxyl methyl cellulose (CMC), starch, hydroxypropyl cellulose, and regenerated cellulose; polyalcohol-based binders; polyolefin binders including polyethylene and polypropylene; polyimide-based binders; polyester-based binder; And a silane-based binder; one selected from the group consisting of, two or more mixtures or copolymers may be used.
- PVdF polyvinylidene fluoride
- PTFE polytetra
- the binder may be included in 10 to 30% by weight based on the total weight of the primer coating layer 51, specifically, the content of the binder may be 10% by weight or more, 12% by weight or more, or 15% by weight or more, 25 may be less than or equal to 28% or less than or equal to 30% by weight. If the content of the binder is less than 10% by weight, the adhesive strength of the powdered positive electrode material P to the positive electrode current collector 50 may decrease, and if it exceeds 30% by weight, it acts as resistance and deteriorates battery performance and lifespan. It can be.
- the conductive material may serve to impart conductivity to the anode.
- the conductive material is not particularly limited as long as it can impart conductivity to the positive electrode without causing chemical change in the battery.
- the conductive material may be graphite such as natural graphite or artificial graphite; carbon black such as acetylene black, ketjen black, channel black, farnes black, lamp black, and thermal black; conductive fibers such as carbon fibers and metal fibers; conductive tubes such as carbon nanotubes; metal powders such as fluorocarbon, aluminum, and nickel powder; conductive whiskers such as zinc oxide and potassium titanate; conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives may be used.
- the conductive material may be included in an amount of 70 to 90% by weight based on the total weight of the primer coating layer, and specifically, the content of the conductive material may be 70% by weight or more, 72% by weight or more, or 75% by weight or more, and 85% by weight or less, 88% by weight or less, or 90% by weight or less. If the content of the conductive material is less than 70% by weight, the content of the binder in the primer coating layer is relatively high, and the primer coating layer acts as a resistance layer, which may reduce the performance and lifespan of the battery and reduce the conductivity of the anode. And, if it exceeds 90% by weight, the content of the binder is relatively small, and formability may be deteriorated.
- the primer coating layer 51 may be formed by adding the binder and the conductive material to a solvent and then applying the coating to one side or both sides of the positive electrode current collector 50 .
- water or an organic solvent may be used as the solvent.
- the binder is an aqueous binder
- water may be used as a solvent
- an organic solvent may be used.
- the organic solvent is not particularly limited as long as it is commonly used in the art.
- the organic solvent is propylene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), ethylmethyl carbonate (EMC ), methylpropyl carbonate, dipropyl carbonate, tetraethylene glycol dimethyl ether (TEGDME), dioxolane (DOL), dimethylsulfuroxide, acetonitrile, dimethoxyethane, diethoxyethane, vinylene carbonate, sulfolane, gamma-buty It may include any one selected from the group consisting of rolactone, propylene sulfite, and tetrahydrofuran, or a mixture of two or more thereof.
- the positive electrode material (P) in a powder state includes a sulfur-carbon composite composed of 50% to 90% by weight of sulfur and 10% to 50% by weight of a porous carbon material.
- the powdered cathode material includes 90 to 100 wt%, preferably 95 to 100 wt%, and more preferably 97 to 100 wt% of the sulfur-carbon composite based on the total weight of the cathode material.
- the sulfur-carbon composite means a form in which the sulfur is supported on the porous carbon material.
- the sulfur-carbon composite may be in a state in which sulfur is attached or coated on the surface of the porous carbon material.
- the sulfur is attached to, filled in, or coated with internal pores of the porous carbon material; Alternatively, the sulfur may be infiltrated and attached to the inside of the porous carbon material.
- the lithium secondary battery according to the present invention may be a lithium-sulfur secondary battery including the sulfur-carbon composite as a positive electrode material.
- the positive electrode material supply unit 10 supplies the positive electrode material P in powder form to one surface of the positive electrode current collector 50 transported by the transfer means 30, and its configuration, device, and the like are not particularly limited.
- the cathode material supply unit 10 includes an ultrasonic sieve machine, a vibratory feeder, or a rotary feeder to remove coarse particles from the powdered cathode material P. can do.
- the loading amount of the positive electrode material P in powder form can be easily adjusted according to the purpose, and the variation in the loading amount can be improved, so that the loading amount of the finally manufactured positive electrode can be adjusted for use. It can be easily adjusted according to, and the reliability of the manufacturing process can be improved.
- the positive electrode material forming unit 20 converts the positive electrode material P in the form of powder supplied to one surface of the positive electrode current collector 50 through the positive electrode material supply unit 10 into a positive electrode active material layer 52 in the form of a layer. After preforming, applying pressure and rolling to adjust the porosity, applying a certain temperature to bond the positive electrode current collector 50 and the positive electrode active material layer 52 to manufacture a positive electrode, its configuration, device, etc. is not particularly limited.
- the positive electrode material forming unit 20 includes a temporary molding roll 21, a rolling roll 22, and an adhesive roll 23 arranged in a line. The arrangement direction of these is the same as the movement direction of the conveying means 30 .
- the temporary roll 21 includes a pair of rollers symmetrical to each other, and between the pair of rollers, the positive electrode current collector 50 supplied with the positive electrode material P in a powder state is transported in one direction. Using the pair of rollers, pressure is applied to the upper and lower portions of the positive electrode current collector 50 to which the positive electrode material P in powder form is supplied, and the positive electrode material P in powder form is pressed to form a layer. ) form of the positive electrode active material layer 52 is formed. When the positive electrode active material layer 52 is formed, the powder is stabilized and fluidization of the powder can be prevented.
- positive electrode laminate including the positive electrode current collector 50 and the positive electrode active material layer 52 formed on one surface of the positive electrode current collector 50, it is referred to as a positive electrode laminate.
- the thickness of the positive electrode active material layer 52 after passing through the caustic roll 21 is the thickness of the positive electrode active material layer 52 before passing through the caustic roll 21, that is, the thickness of the positive electrode material P in powder form.
- the thickness ratio may be 0.6 or more, specifically 0.6 or more, 0.7 or more, or 0.8 or more, and the upper limit thereof is not particularly limited, but may be 0.9 or less. If the thickness ratio ( ⁇ ) of the positive electrode active material layer 52 before and after passing through the caustic roll 21 is less than 0.6, the structure of the supplied powdered positive electrode material is likely to collapse, and the force applied locally to the current collector increases. There is a problem of breakage, and if it exceeds 0.9, the layered positive active material layer 52 cannot be properly formed, and powder stabilization is not completely, so flying may occur.
- the positive active material layer 52 in the form of a layer may be formed well, and the thickness ratio ⁇ before and after passing through the positive active material layer 52 may be pressurized to satisfy a range of 0.6 or more.
- the pressure to satisfy the thickness ratio may be appropriately adjusted during the process.
- a pressure of 100 to 500 kPa is applied to the upper and lower portions of the positive electrode current collector 50 supplied with the positive electrode material P in powder form.
- the pressure may be 100 kPa or more, 150 kPa or more, or 200 kPa or more, and may be 400 kPa or less, 450 kPa or less, or 500 kPa or less. If the pressure is less than 100 kPa, the layer shape cannot be formed properly, and powder stabilization is not completely, so blowing may occur, and if the pressure exceeds 500 kPa, the electrode may be broken.
- the rolling roll 22 includes a pair of rollers symmetrical to each other, and the anode laminate is conveyed in one direction between the pair of rollers.
- the positive electrode laminate includes a positive electrode current collector 50 and a positive electrode active material layer 52 that have passed through a temporary mold roll 21 .
- the thickness of the positive active material layer 52 after passing through the rolling roll 22 is the positive active material layer 52 before passing through the rolling roll 22, that is, the positive active material layer passing through the temporary mold roll 21.
- the thickness ratio may be 0.5 or less, specifically 0.5 or less, 0.4 or less, or 0.3 or less, and the lower limit is not particularly limited, but may be 0.1 or more. If the thickness ratio ( ⁇ ) of the positive electrode active material layer 52 before and after passing through the rolling roll 22 is greater than 0.5, the process for forming the positive electrode active material layer with the final porosity may take a long time, and if it is less than 0.1, the current collector is broken due to excessive rolling. There is a possibility.
- the positive active material layer 52 in the form of a layer is well formed, and the thickness ratio ( ⁇ ) before and after passing through the positive active material layer 52 satisfies the range of 0.5 or less. It can be pressed.
- the pressure to satisfy the thickness ratio may be appropriately adjusted during the process. For example, a pressure of 1 to 5 MPa is applied to the upper and lower portions of the positive electrode laminate including the positive electrode current collector 50 and the positive electrode active material layer 52. can be applied with Specifically, the pressure may be 1 MPa or more, 1.5 MPa or more, or 2 MPa or more, and may be 4 MPa or less, 4.5 MPa or less, or 5 MPa or less.
- the pressure is less than 1 MPa, the porosity of the positive electrode to be manufactured is high, so durability may be lowered, or powder stabilization may be incomplete, and blowing may occur. If the pressure is greater than 5 MPa, there may be a problem in that the electrode is broken.
- the adhesive roll 23 includes a pair of rollers symmetrical to each other, and the anode laminate is transferred in one direction between the pair of rollers.
- the positive electrode laminate includes a positive electrode current collector 50 and a positive electrode active material layer 52 passed through a rolling roll 22 .
- the adhesive roll 23 may be bonded with a gap of several ⁇ m by using a rubber roll or a roll having a thickness of several ⁇ m lower than the thickness of the electrode.
- the temperature may be 50 °C to 130 °C, specifically, the temperature may be 50 °C or more, 55 °C or more, or 60 °C or more, and may be 110 °C or less, 120 °C or less, or 130 °C or less. If the temperature is less than 50 ° C, the adhesiveness of the positive electrode active material layer 52 to the positive electrode current collector 50 may decrease, and if it exceeds 130 ° C, battery performance may be degraded beyond the appropriate range for the sulfur content in the powder.
- the positive electrode laminate passed through the adhesive roll 23 is made of a positive electrode 60 for a lithium secondary battery including a positive electrode current collector 50 and a positive electrode active material layer 52 formed on one surface of the positive electrode current collector 50, , can be wound with the winding roll 70.
- the positive electrode material recovery unit 40 is a positive electrode material (P) in the form of powder remaining on the positive electrode current collector 50 after the positive electrode active material layer 52 is formed on the positive electrode current collector 50 in the positive electrode material molding unit 20. ), the positive electrode material P in powder form may be recovered from the positive electrode current collector 50 to the positive electrode material supply unit 10 .
- the positive electrode material recovery unit 40 is not particularly limited as long as it is a device capable of recovering powder having little adhesion.
- the cathode material recovery unit 40 may be a scraper or an air gun.
- the positive electrode material recovery unit 40 may be mounted at a corresponding position before the positive electrode manufactured by passing through the positive electrode material forming unit 30 is wound around the winding roll 70 .
- the positive electrode manufactured by passing through the positive electrode material forming unit 20 may be wound around a winding roll 70 .
- the present invention relates to a method for manufacturing a positive electrode for a lithium secondary battery, comprising: (S1) supplying a powdered positive electrode material to one surface of a positive electrode current collector being transported by a transfer means; (S2) a temporary shaping step of forming a layered cathode material layer by applying pressure to the powdered cathode material supplied to one surface of the cathode current collector and transferred in the step (S1); (S3) a rolling step of adjusting the porosity of the positive electrode material layer by applying pressure to the positive electrode current collector on which the positive electrode material layer is formed on one surface; And (S4) heating the positive electrode current collector on which the positive electrode material layer was rolled in step (S3) to bond the positive electrode material layer and the positive electrode current collector, and further, (S5) after bonding, A step of recovering the positive electrode material in powder form remaining on the entire phase to the positive electrode material supply unit may be further included.
- a positive electrode material in a powder state may be supplied to one surface of the positive electrode current collector being transported by the transfer means.
- the step (S1) is performed in the positive electrode material supply unit as described above, and the transfer means, the positive electrode current collector, and the powdered positive electrode material are the same as described above.
- step (S2) of the method for manufacturing a positive electrode for a lithium secondary battery pressure is applied to the positive electrode material in a powder state supplied to one surface of the positive electrode current collector, which is transferred in step (S1), to form a layer. It can be temporarily molded to form a cathode material layer of
- the step (S2) is performed in the temporary mold roll of the positive electrode material forming unit as described above, and the device and pressure conditions provided in the false mold roll are the same as described above.
- the porosity of the cathode material layer may be adjusted by applying pressure to a cathode current collector having a cathode material layer formed on one surface thereof.
- the step (S3) is performed in the rolling roll of the positive electrode material forming unit as described above, and the device provided in the rolling roll and the pressure conditions are the same as described above.
- step (S4) of the method for manufacturing a positive electrode for a lithium secondary battery according to an embodiment of the present invention the positive electrode material layer and the positive electrode current collector are bonded by heating the positive electrode current collector on which the positive electrode material layer is formed, which is rolled in the step (S3) can
- the step (S4) is performed in the adhesive roll of the positive electrode material forming unit as described above, and the device provided in the rolling roll and the pressure conditions are the same as described above.
- step (S5) of the method for manufacturing a cathode for a lithium secondary battery the cathode material in powder form remaining on the cathode current collector after (S5) bonding may be recovered to the cathode material supplier.
- the step (S5) is performed using a cathode material recovery unit, and details of the cathode material recovery unit are as described above.
- the steps (S1) to (S4) may be repeated twice. Steps (S1) to (S4) may be sequentially performed.
- a positive electrode having a positive electrode active material layer formed on one surface of the positive electrode current collector may be manufactured.
- a positive electrode having a positive electrode active material layer formed on both sides of the positive electrode current collector may be manufactured.
- the positive electrode having the positive electrode active material layer formed on both sides may be manufactured at once by configuring the positive electrode material supply unit and the positive electrode material forming unit in two layers and simultaneously supplying the positive electrode material to both sides of the positive electrode current collector.
- the positive active material layer on the upper surface of the positive current collector may be formed in the same manner as in the steps (S1) to (S4), and the positive active material layer on the lower surface of the positive current collector is a foil instead of a foil positive current collector.
- the positive electrode material in powder form is not separately supplied from the positive electrode material supply unit to the lower surface of the positive electrode current collector, but is transferred in the form of a foil.
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Abstract
Description
Claims (11)
- 일 방향으로 이동하는 이송수단에 의해서 이송되는 양극 집전체의 일 면에, 분말 상태의 양극재를 공급하는 양극재 공급부; 및상기 양극 집전체의 일 면에 공급된 분말 상태의 양극재를 양극재층 형태로 가성형, 압연 및 접착시키는 양극재 성형부;를 포함하는 리튬 이차전지용 양극 제조장치로서,상기 양극재 성형부는 일렬로 배열된 가성형 롤, 압연 롤 및 접착 롤을 포함하며,상기 가성형 롤, 압연 롤 및 접착 롤은 각각 서로 대칭되는 한 쌍의 롤을 포함하며, 상기 한 쌍의 롤 사이로 상기 이송수단이 일 방향으로 이송되는 것인, 리튬 이차전지용 양극 제조장치.
- 제1항에 있어서,상기 가성형 롤은, 상기 가성형 롤 통과 전 대비 통과 후의 양극재층의 두께비가 0.6 이상이 되도록 가압하는 것인, 리튬 이차전지용 양극 제조장치.
- 제1항에 있어서,상기 압연 롤은, 상기 압연 롤 통과 전 대비 통과 후의 양극재층의 두께비가 0.5 이하가 되도록 가압하는 것인, 리튬 이차전지용 양극 제조장치.
- 제1항에 있어서,상기 접착 롤은, 50℃ 내지 130℃의 온도를 가하여, 상기 양극 집전체와 양극재층을 접착시키는 것인, 리튬 이차전지용 양극 제조장치.
- 제1항에 있어서,상기 양극재 공급부는 초음파 체질기(ultrasonic sieve machine), 진동 공급기(vibratory feeder) 또는 회전 공급기(rotary feeder)를 포함하는 것인, 리튬 이차전지용 양극 제조장치.
- 제1항에 있어서,상기 양극 집전체의 일 면에는 바인더를 포함하는 프라이머 코팅층이 형성된 것인, 리튬 이차전지용 양극 제조장치.
- 제6항에 있어서,상기 바인더는 폴리비닐리덴 플루오라이드(polyvinylidene fluoride, PVdF) 또는 폴리테트라플루오로에틸렌(polytetrafluoroethylene, PTFE)을 포함하는 불소 수지계 바인더; 스티렌-부타디엔 고무(styrene butadiene rubber, SBR), 아크릴로니트릴-부티디엔 고무, 스티렌-이소프렌 고무를 포함하는 고무계 바인더; 카르복시메틸셀룰로우즈(carboxyl methyl cellulose, CMC), 전분, 히드록시 프로필셀룰로우즈, 재생 셀룰로오스를 포함하는 셀룰로오스계 바인더; 폴리 알코올계 바인더; 폴리에틸렌, 폴리프로필렌를 포함하는 폴리 올레핀계 바인더; 폴리 이미드계 바인더; 폴리 에스테르계 바인더; 및 실란계 바인더;로 이루어진 군으로부터 선택된 1종 이상을 포함하는 것인, 리튬 이차전지용 양극 제조장치.
- 제1항에 있어서,상기 분말 상태의 양극재는 황 50 내지 90 중량% 및 다공성 탄소재 10 내지 50 중량%로 구성된 황-탄소 복합체를 포함하는 것인, 리튬 이차전지용 양극 제조장치.
- (S1) 이송수단에 의해 이송되는 양극 집전체의 일 면에 분말 상태의 양극재를 공급하는 단계;(S2) 상기 (S1) 단계에서 이송되며, 상기 양극 집전체의 일 면에 공급된 분말 상태의 양극재에 압력을 가하여 레이어 형태의 양극재층을 형성하는 가성형 단계;(S3) 상기 일 면에 양극재층이 형성된 양극 집전체에 압력을 가하여, 상기 양극재층의 기공도를 조절하는 압연 단계; 및(S4) 상기 (S3) 단계에서 압연된, 양극재층이 형성된 양극 집전체를 가온하여 상기 양극재층과 양극 집전체를 접착시키는 단계;를 포함하는, 리튬 이차전지용 양극의 제조방법.
- 제9항에 있어서,상기 (S4) 단계 이후에, (S5) 상기 접착 후 양극 집전체 상에 잔여한 분말 상태의 양극재를 양극재 공급부로 회수하는 단계를 포함하는, 리튬 이차전지용 양극의 제조방법.
- 제9항에 있어서,상기 (S1) 내지 (S4) 단계는 2회 반복되며, 상기 (S1) 단계 내지 (S4) 단계는 순차적으로 수행되는 것인, 리튬 이차전지용 양극의 제조방법.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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CN202280010350.9A CN116724405A (zh) | 2021-12-16 | 2022-11-28 | 制造锂二次电池用正极的设备、其制造方法及包含其的锂二次电池 |
EP22907766.4A EP4261919A4 (en) | 2021-12-16 | 2022-11-28 | LITHIUM SECONDARY BATTERY CATHODE MANUFACTURING DEVICE, MANUFACTURING METHOD THEREOF, AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME |
JP2023544396A JP2024504154A (ja) | 2021-12-16 | 2022-11-28 | リチウム二次電池用正極の製造装置、及びこれの製造方法 |
US18/282,462 US20240170631A1 (en) | 2021-12-16 | 2022-11-28 | Apparatus and method for manufacturing positive electrode for lithium secondary battery |
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EP (1) | EP4261919A4 (ko) |
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KR (1) | KR20230091674A (ko) |
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US10453622B2 (en) * | 2017-03-14 | 2019-10-22 | Licap Technologies, Inc. | Low cost high power dry powder injected electrodes and method of making same |
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- 2022-11-28 WO PCT/KR2022/018937 patent/WO2023113297A1/ko active Application Filing
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- 2022-11-28 JP JP2023544396A patent/JP2024504154A/ja active Pending
- 2022-11-28 EP EP22907766.4A patent/EP4261919A4/en active Pending
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CN116724405A (zh) | 2023-09-08 |
KR20230091674A (ko) | 2023-06-23 |
JP2024504154A (ja) | 2024-01-30 |
EP4261919A4 (en) | 2024-08-14 |
EP4261919A1 (en) | 2023-10-18 |
US20240170631A1 (en) | 2024-05-23 |
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