CN113823760A - Ultrathin lithium strip prefabricated member, composite negative electrode, preparation method of composite negative electrode and battery - Google Patents
Ultrathin lithium strip prefabricated member, composite negative electrode, preparation method of composite negative electrode and battery Download PDFInfo
- Publication number
- CN113823760A CN113823760A CN202010558625.5A CN202010558625A CN113823760A CN 113823760 A CN113823760 A CN 113823760A CN 202010558625 A CN202010558625 A CN 202010558625A CN 113823760 A CN113823760 A CN 113823760A
- Authority
- CN
- China
- Prior art keywords
- lithium
- ultra
- strip
- negative electrode
- thin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 254
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 236
- 239000002131 composite material Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 239000010410 layer Substances 0.000 claims description 68
- 238000000034 method Methods 0.000 claims description 35
- 238000005096 rolling process Methods 0.000 claims description 29
- 239000000463 material Substances 0.000 claims description 25
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 239000002184 metal Substances 0.000 claims description 19
- 239000000758 substrate Substances 0.000 claims description 17
- 239000011248 coating agent Substances 0.000 claims description 16
- 238000000576 coating method Methods 0.000 claims description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 15
- 239000002994 raw material Substances 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- -1 polyethylene Polymers 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000004743 Polypropylene Substances 0.000 claims description 6
- 229920001155 polypropylene Polymers 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 238000010924 continuous production Methods 0.000 claims description 4
- 229910000521 B alloy Inorganic materials 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000004793 Polystyrene Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- PPTSBERGOGHCHC-UHFFFAOYSA-N boron lithium Chemical compound [Li].[B] PPTSBERGOGHCHC-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 229920000098 polyolefin Polymers 0.000 claims description 3
- 229920002223 polystyrene Polymers 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- 229910000846 In alloy Inorganic materials 0.000 claims description 2
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 2
- 229910000676 Si alloy Inorganic materials 0.000 claims description 2
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 claims description 2
- JDZCKJOXGCMJGS-UHFFFAOYSA-N [Li].[S] Chemical compound [Li].[S] JDZCKJOXGCMJGS-UHFFFAOYSA-N 0.000 claims description 2
- ZVLDJSZFKQJMKD-UHFFFAOYSA-N [Li].[Si] Chemical compound [Li].[Si] ZVLDJSZFKQJMKD-UHFFFAOYSA-N 0.000 claims description 2
- 239000002041 carbon nanotube Substances 0.000 claims description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 2
- 239000011247 coating layer Substances 0.000 claims description 2
- 239000004020 conductor Substances 0.000 claims description 2
- 229910021389 graphene Inorganic materials 0.000 claims description 2
- LHJOPRPDWDXEIY-UHFFFAOYSA-N indium lithium Chemical compound [Li].[In] LHJOPRPDWDXEIY-UHFFFAOYSA-N 0.000 claims description 2
- 229910052809 inorganic oxide Inorganic materials 0.000 claims description 2
- GCICAPWZNUIIDV-UHFFFAOYSA-N lithium magnesium Chemical compound [Li].[Mg] GCICAPWZNUIIDV-UHFFFAOYSA-N 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims description 2
- 239000002356 single layer Substances 0.000 claims description 2
- 229910000733 Li alloy Inorganic materials 0.000 claims 2
- 239000001989 lithium alloy Substances 0.000 claims 2
- 239000012528 membrane Substances 0.000 claims 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims 1
- 239000011148 porous material Substances 0.000 abstract description 5
- 239000010408 film Substances 0.000 description 36
- 238000006138 lithiation reaction Methods 0.000 description 13
- 238000004804 winding Methods 0.000 description 13
- 239000011889 copper foil Substances 0.000 description 12
- 239000000047 product Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 6
- 239000003792 electrolyte Substances 0.000 description 5
- 239000013589 supplement Substances 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000011888 foil Substances 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 description 3
- 239000002000 Electrolyte additive Substances 0.000 description 3
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 3
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 238000005488 sandblasting Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- 229910001290 LiPF6 Inorganic materials 0.000 description 2
- 241001149649 Taxus wallichiana var. chinensis Species 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- 244000050510 Cunninghamia lanceolata Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 239000011127 biaxially oriented polypropylene Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/134—Electrodes based on metals, Si or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
- H01M12/00—Hybrid cells; Manufacture thereof
- H01M12/08—Hybrid cells; Manufacture thereof composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
-
- 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
- H01M4/139—Processes of manufacture
- H01M4/1395—Processes of manufacture of electrodes based on metals, Si or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides an ultrathin lithium strip prefabricated member, a composite negative electrode, a preparation method of the composite negative electrode and a battery. The ultra-thin lithium bar preform has: the supporting layer is a strip with the width of 3-2000 mm; and a plurality of ultra-thin lithium strips which are located on at least one surface of the supporting layer and combined with the supporting layer, wherein the plurality of ultra-thin lithium strips are more than 2 ultra-thin lithium strips which extend along the length direction of the supporting layer and are separated from each other in the width direction of the supporting layer, the width of each ultra-thin lithium strip is in the range of 1-200mm, the thickness of each ultra-thin lithium strip is consistent and is in the range of 0.5-15 microns, each ultra-thin lithium strip is provided with through holes with the pore diameter of 5-1000 microns, the porosity is below 50%, and the distance between every two adjacent ultra-thin lithium strips is 0.5-10 mm.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to an ultrathin lithium strip prefabricated member for a secondary battery, a composite cathode and a preparation method of the ultrathin lithium strip prefabricated member.
Background
The lithium battery is widely applied to the fields of aerospace, computers, mobile communication equipment, robots, electric automobiles and the like due to the advantages of high energy density, long cycle life and wide applicable temperature range. With the development of society and the progress of science and technology, the requirements on the energy density and the cycle life of a lithium battery are higher and higher, but the lithium ion battery which only uses graphite as a negative electrode at present cannot meet the social expectation, so that the development of a novel positive and negative electrode material with higher specific capacity is needed. For the negative electrode material, the pre-lithiation work can effectively improve the specific energy of the battery and prolong the service life of the battery. Lithium metal has a high specific capacity (3860mAh/g, 10 times that of graphite negative electrodes) and the lowest redox potential (-3.04V VS standard hydrogen potential). The method has the advantages that the lithium metal is adopted to carry out pre-lithiation treatment on the traditional graphite cathode, so that on one hand, the first coulomb efficiency of the battery can be improved, the specific energy of the battery is increased, and on the other hand, the cycle life of the battery can be effectively prolonged, so that the lithium ion battery has a wider application field.
Although prelithiation (lithium supplementation) has such advantages, it places higher demands on the prelithiation of the negative electrode to precisely control its amount in the battery. The anode material adopted by the existing lithium ion battery is lithium-containing material (such as lithium cobaltate, lithium iron phosphate, ternary material and the like), the lithium contained in the anode can meet the charge and discharge requirements of the lithium ion battery, and the lithium lost by a Solid Electrolyte Interface (SEI) film can be supplemented only by a small amount of lithium (the thickness of the lithium is 0.5-10 microns) required by the cathode. In the chinese patent application CN201610102992.8 of new energy in ningde time, lithium powder is scattered on the surface of a pole piece during the lithium supplement process, and pre-lithiation is performed after rolling. However, the lithium supplement method cannot realize the precise control of the lithium supplement amount, and has the disadvantages of complex process, high cost and difficult control of safety.
In view of this, a technology capable of precisely controlling the amount of lithium supplement and achieving high energy density of a battery is required.
Disclosure of Invention
The inventors have surprisingly found that: for the lithium film used for the negative electrode pre-lithiation, if the lithium film is provided with through holes, the electrolyte can easily enter the contact interface of the lithium film and the negative electrode diaphragm due to the existence of the holes, so that the pre-lithiation speed is improved, and gas generated during the pre-lithiation can be released from the through holes, so that the lithium film is prevented from being separated from the negative electrode diaphragm. Therefore, the lithium film having the through-holes can achieve a better pre-lithiation effect than the complete lithium film. Further, the advantage is more obvious when the ultrathin lithium strips with smaller spacing are used for the anode prelithiation.
In addition, the inventors have also found that: ultrathin lithium strips with through-holes (0.5 to 15 microns, even 1 to 5 microns in thickness) can be produced by rolling in a roll-to-roll manner, and the adhesion of the ultrathin lithium strips with through-holes to the support layer can be controlled by controlling the rolling pressure to a suitable level, both to ensure that the ultrathin lithium strips can be composited on the support layer, and also to be easily transferred from the support layer to other substrates, such as the negative electrode of a lithium battery. The present invention has been accomplished in view of these findings.
Accordingly, one aspect of the present invention is directed to an ultra-thin lithium bar preform having: the supporting layer is a strip with the width of 3-2000 mm; and a plurality of ultra-thin lithium strips which are located on at least one surface of the supporting layer and combined with the supporting layer, wherein the plurality of ultra-thin lithium strips are more than 2 ultra-thin lithium strips which extend along the length direction of the supporting layer and are separated from each other in the width direction of the supporting layer, the width of each ultra-thin lithium strip is in the range of 1-200mm, the thickness of each ultra-thin lithium strip is in the range of 0.5-15 microns, each ultra-thin lithium strip is provided with through holes with the aperture of 5-1000 microns, the porosity is below 50%, and the distance between every two adjacent ultra-thin lithium strips is 0.5-10 mm.
The ultrathin lithium strip prefabricated member is a product which is provided with continuous ultrathin lithium strips with through holes and adjustable width and thickness (controlling the size and pressure of a lithium film) supported on a supporting layer (a film base material), and a composite strip material with intervals is arranged between the adjacent ultrathin lithium strips.
In the present invention, the ultra-thin lithium strip is a uniform thin film, which means that the ultra-thin lithium strip has a complete thin film shape (without significant wrinkles and deformations) and has a uniform thickness. Preferably, the ultra-thin lithium strip has through holes that are relatively uniform throughout the lithium film.
Optionally, the surface of the lithium strip of the ultrathin lithium strip prefabricated member is bright and is silvery white, the lithium content is 99.90-99.95%, the thickness range of the lithium film is 0.5-15 microns, preferably 1-10 microns, and the thickness tolerance is +/-1 micron.
Optionally, the lithium strip of the ultrathin lithium strip preform is a lithium metal alloy product (e.g., lithium magnesium alloy, lithium aluminum alloy, lithium boron alloy, lithium silicon alloy, lithium boron alloy, lithium indium alloy), and the lithium content is 10-99.9%.
Optionally, the ultrathin lithium strips are provided with uniformly distributed through holes with the aperture of 100-500 microns.
Optionally, the ultrathin lithium strip has a porosity of 0 to 50%, preferably 0.5% to 10%, more preferably 1% to 5%.
Optionally, the number of the ultrathin lithium strips is at least 2 or more, and the adjacent ultrathin lithium strips have a spacing of 0.5-10mm, preferably 1-5 mm.
Alternatively, the width of the ultra-thin lithium strip is 1-200mm, preferably 1-50mm, more preferably 2-10 mm.
Optionally, the width of the ultra-thin lithium bar preform is 3-2000mm, preferably 100-300 mm.
Optionally, the support layer material is a polymer or a release film composed thereof: for example, high-strength thin-film polyolefin (polyethylene, polypropylene, polystyrene), polyester, biaxially oriented polypropylene (BOPP) release films, and the like; inorganic oxide(s): such as alumina; inorganic conductor: such as graphite, carbon nanotubes, graphene; a metal current collector: such as copper, aluminum; the supporting layer is a single layer or a multi-layer composite.
Optionally, the thickness of the support layer is from 1 to 500 microns, preferably from 5 to 100 microns, more preferably from 10 to 50 microns.
Another aspect of the present invention provides a composite anode including: a current collector; a negative electrode coating on a surface of the current collector; and an ultrathin lithium strip compounded on the surface of the negative electrode coating layer far away from the current collector, wherein the ultrathin lithium strip is obtained by removing the supporting layer from the ultrathin lithium strip preform.
Optionally, the ultra-thin lithium strips covered on the surface of the negative electrode coating at least comprise 2 or more, and the adjacent ultra-thin lithium strips have a spacing of 0.5-10mm, preferably 2-5 mm.
According to another aspect of the invention, the method is a roll-to-roll continuous production method, a metal lithium strip with the thickness of 5-200 microns is used as a raw material, one surface of the metal lithium strip is attached to a salient point anti-sticking base material, the other surface of the metal lithium strip is attached to a supporting layer and then enters a roller, the salient point anti-sticking base material and the metal lithium strip are peeled after rolling to obtain the ultrathin lithium strip supported by the supporting layer, and then part of metal lithium of the ultrathin lithium strip supported by the supporting layer is removed to form the ultrathin lithium strips with intervals, so that the ultrathin lithium strip preform is obtained.
Optionally, the thickness of the rolled raw material lithium metal strip is 1-200 μm, preferably 5-150 μm.
Optionally, one surface of the bump anti-sticking substrate, which is in contact with the lithium metal, is provided with an anti-sticking coating, and the bump anti-sticking film or the anti-sticking coating is provided with a plurality of uneven point-like protrusions.
Optionally, the bump release substrate is a single or multilayer film prepared from a material selected from the group consisting of: polymers including polyolefins (polyethylene, polypropylene, polystyrene), polyesters; metals, including steel, aluminum, copper.
Alternatively, the adhesion of the ultra-thin lithium bar and the support layer is controlled by adjusting the rolling pressure.
Optionally, the process of providing the bump anti-sticking substrate with a plurality of dot-shaped protrusions includes back sand blasting and mechanical rolling processes of the substrate.
Optionally, scraping is performed with a doctor blade, removing portions of the metallic lithium ribbon from the ultra-thin lithium ribbon supported by the ribbon support layer to form ultra-thin lithium strips with spaces.
Optionally, the blade is a flat blade or a rotating blade. A flat blade means a blade that moves relative to the ultra-thin lithium ribbon, and a rotating blade means a blade that can rotate about its axis
Another aspect of the present invention provides a method for producing the above composite anode, characterized in that: the method is a roll-to-roll continuous production method, and the ultrathin lithium strip prefabricated member prepared by the method is used as a raw material, and the ultrathin lithium strip is transferred to a negative electrode coating from a supporting layer by a pressure composite transfer method.
Optionally, the raw material for preparing the composite negative electrode is an ultrathin lithium strip prefabricated member taking the anti-sticking film as a supporting layer.
Another aspect of the present invention provides a battery comprising a positive electrode and a negative electrode oppositely disposed, wherein the negative electrode comprises the above ultra-thin lithium bar preform or the above composite negative electrode.
Optionally, the battery comprises a lithium metal battery, an all-solid-state battery, a lithium sulfur battery, or a lithium air battery.
According to the invention, by controlling the thickness and the width of the ultrathin lithium strip, the lithium loading amount of a unit area can be accurately controlled, so that the lithium supplementing amount can be accurately controlled when the ultrathin lithium strip prefabricated member or the composite negative electrode is used for supplementing lithium to a lithium battery, the first cycle efficiency of the battery is effectively improved, and the cycle life of the lithium battery is greatly prolonged. Moreover, the ultrathin lithium strip can be provided with the through hole, the electrolyte can easily enter a contact interface of the lithium film and the negative electrode diaphragm due to the through hole, the pre-lithiation speed is improved, and gas generated in the pre-lithiation process can be released from the through hole, so that the lithium film is prevented from being separated from the negative electrode diaphragm. Therefore, the lithium film having the through-holes can achieve a better prelithiation effect.
Drawings
Fig. 1 is a top view of an ultra-thin lithium bar preform product of the present invention.
Fig. 2 is a side view of the ultra-thin lithium bar preform product of fig. 1.
Fig. 3 is a schematic view of a composite anode of the present invention.
FIG. 4 is a diagram of a process for preparing an ultra-thin lithium bar preform product.
Fig. 5 is a process diagram for preparing a composite negative electrode product.
Fig. 6 is a diagram of a battery negative electrode after disassembly of pre-lithiation using the ultra-thin lithium bar preform of example 1.
Fig. 7 is a diagram of a battery negative electrode after disassembly using pre-lithiation with ultra-thin lithium strips of 2.6 microns relative thickness without micropores.
Fig. 8 is a diagram of a battery negative electrode after disassembly using pre-lithiation with 5 micron ultra-thin lithium foil.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 and 2 show a product schematic of an ultra-thin lithium bar preform of the present invention. As shown in fig. 1 and 2, the ultra-thin metallic lithium strips L are attached to the support layer P; and a certain distance is reserved between adjacent ultrathin lithium strips.
The method for manufacturing the ultra-thin lithium bar preform is described in detail with reference to fig. 4. A coil of lithium metal ribbon L is mounted on a lithium ribbon unwind spool 10, passing through a back-up roll 101 and into a nip roll 13. The roll of the support layer P is mounted on the unwinding shaft 11, and is attached to the lower side (in the upper direction in the drawing) of the lithium ribbon L to be fed into the nip roller 13 together with the lithium ribbon L. The bump release substrate P2 is attached to the unwinding spool 12, passes through the backup roller 121, and is attached to the upper side (in the direction of the drawing) of the lithium ribbon L, and enters the nip roller 13 together with the lithium ribbon L and the carrier layer P. After rolling by a roller 13, peeling the bump anti-sticking base material P2 to obtain the ultrathin lithium foil with the supporting layer P for supporting; then, a blade 16 (which assists the support roll 15) is used to remove a portion of the lithium metal to form an ultra-thin lithium bar preform PL. After passing through the roller, the bump anti-sticking base material P2 passes through the supporting roller 141 and is wound by the winding shaft 14; the prepared ultrathin lithium bar prefabricated member PL is wound by a winding shaft 17.
One method of preparing the bump release substrate P2 is: coating an anti-sticking material on a common substrate to prepare a film substrate with an anti-sticking function; pressure is then applied mechanically to the side not coated with release material, causing the release material-coated side to appear as a plurality of punctiform protuberances. After the punctiform protrusions, the lithium belt and the carrying layer enter a roller for rolling, micropores are formed at positions on the lithium belt corresponding to the protrusions. Therefore, the diameter, height and distribution density of the dot-shaped protrusions determine the diameter and porosity of the micro-pores in the ultra-thin lithium bar preform. The mechanical method for making the bumps may be: a sand blasting process or a rolling method is adopted. The sand blasting process method comprises the following steps: spraying fine particles on the side, which is not coated with the anti-sticking material, of the prepared anti-sticking film substrate by using pressure, so that the particles are impacted on the surface of the substrate to form pits, and convex points are formed on the corresponding side, which is coated with the anti-sticking material, of the substrate; the density of the salient points on the substrate is controlled by controlling the moving speed of the anti-sticking film substrate and the spraying amount of the fine particles. The rolling method comprises the following steps: the anti-sticking substrate is rolled by a pair-roller machine with at least one roller provided with convex points, so that the side of the anti-sticking substrate coated with the anti-sticking material is provided with the convex points, and the diameter and the density of the convex points are determined by the diameter and the distribution density of the convex points on the roller.
Fig. 3 shows a schematic diagram of a composite negative electrode provided by the present invention. The composite negative electrode comprises a current collector C, a negative electrode coating N and an ultrathin lithium strip L compounded on one surface, far away from the current collector C, of the negative electrode coating N.
The method of manufacturing the composite anode is described in detail with reference to fig. 5. And mounting the cathode assembly CN coated with the cathode coating N on a unreeling shaft 22 for unreeling, so that one side of the cathode coating is opposite to the ultrathin lithium bar prefabricated member PL. The ultrathin lithium bar prefabricated member PL enters a rolling mill after being unreeled by the unreeling shaft 20, so that one side of the ultrathin lithium bar prefabricated member PL combined with the ultrathin lithium bars L is arranged opposite to the negative electrode component CN. The ultrathin lithium bar prefabricated part PL and the negative electrode component CN enter a rolling mill together, and after pressure composite transfer is carried out through a roller 23 and a roller 24, the ultrathin lithium bars L on the ultrathin lithium bar prefabricated part PL are transferred onto the negative electrode component CN, so that the composite negative electrode CNL is formed; and removing the ultrathin lithium strips from the ultrathin lithium strip preform PL, and only remaining the supporting layer P. The supporting layer at the outlet end of the rolling mill is wound by using a winding shaft 26; the composite negative electrode CNL prepared at the outlet end of the rolling mill passes through a supporting roller 25 and is wound by a winding shaft 27.
Hereinafter, the present invention will be described more specifically by examples using the above-described process. The various product parameters and process conditions used in the following examples are exemplary and should not be construed as limiting the invention.
Example 1: the ultrathin lithium strip prefabricated member with the PET as the material of the carrying layer is prepared by taking a lithium belt as a raw material.
A metallic lithium tape with a width of 100mm and a thickness of 30 μm was used as a raw material; the thickness of the prepared PET bump anti-sticking film is 60 μm, the width is 120mm, the peeling force is 5-10g, the diameter of the bump is 30-100 μm, and the area ratio of the bump is about 5%; the support layer used was a PET film with a release layer, the thickness of which was 30 μm, the width of which was 120mm, and the peel force of which was 10 to 20 g.
Referring to fig. 4, a coil of lithium metal strip L is mounted on a lithium strip unwinding shaft 10, and the lithium metal strip L passes through a support roller 101 and then enters a roll. The roll material of the carrying layer P is arranged on the unreeling shaft 11, so that one surface of the carrying layer P with the anti-sticking layer is opposite to the metal lithium strip L, and the carrying layer P directly enters the roller after unreeling. The bump release film P2 is mounted on the unwinding shaft 12, and the side having the bumps and the release layer is disposed opposite to the lithium metal tape L, and the bump release film P2 passes through the support roller 121 and then enters the nip roller 13 together with the lithium metal tape L and the carrier layer P. Rolling under the rolling pressure of 30 MPa; after rolling, the salient point anti-sticking film P2 is separated, and the separated salient point anti-sticking film P2 winds around the supporting roller 141 and then is wound by the winding shaft 14; and removing strip-shaped metal lithium with a half area by using a scraper 16 to form an ultrathin lithium foil and a prefabricated member formed by a carrying layer after separation at an interval of 3mm to form an ultrathin lithium strip prefabricated member PL, and winding the ultrathin lithium strip prefabricated member by using a winding shaft 17.
Measuring the thickness of the ultrathin lithium bar prefabricated member PL obtained by the method, wherein the total thickness is about 35.2 mu m, the thickness of the loaded layer is removed, and the thickness of the pure lithium layer is about 5.2 mu m; the pore diameter is about 30-100 μm, the porosity is 4.5%, the width of a single lithium strip is 2mm, the distance between adjacent lithium strips is 2mm, and the relative thickness of the ultrathin lithium strip preform PL is 2.6 μm.
Example 2: the ultrathin lithium strip prefabricated member with the copper foil as the material of the carrying layer is prepared by taking a lithium strip as a raw material.
Using a metallic lithium strip with the width of 80mm and the thickness of 30 mu m as a raw material; the thickness of the prepared PET bump anti-sticking film is 60 μm, the width is 100mm, the peeling force is 3-5g, the diameter of the bump is 30-100 μm, and the area ratio of the bump is about 5%; the carrier layer used was a copper foil having a thickness of 8 μm and a width of 120 mm.
Referring to fig. 4, a coil of lithium metal strip L is mounted on a lithium strip unwinding shaft 10, and the lithium metal strip L passes through a support roller 101 and then enters a roll. The copper foil P coil stock is arranged on the unreeling shaft 11 and directly enters a roller after unreeling. The bump release film P2 is mounted on the unwinding shaft 12, one side having bumps and a release layer is disposed opposite to the lithium metal tape L, and the bump release film P2 passes through the supporting roller 121 and then enters the nip roller 13 together with the lithium metal tape L and the copper foil P. Rolling under the rolling pressure of 10 MPa; after rolling, the salient point anti-sticking film P2 is separated, and the separated salient point anti-sticking film P2 winds around the supporting roller 141 and then is wound by the winding shaft 14; and removing part of strip-shaped metal lithium from the prefabricated part formed by the ultrathin lithium foil and the copper foil after separation by using a scraper 16 to form an ultrathin lithium strip prefabricated part PL, and winding the ultrathin lithium strip prefabricated part by using a winding shaft 17.
Measuring the ultrathin lithium bar prefabricated member PL obtained by the method, wherein the total thickness is about 37.2 mu m, the thickness of the copper foil is removed, and the thickness of the pure lithium layer is about 29.2 mu m; the pore diameter is about 30-100 μm, the porosity is 4.5%, the width of a single lithium strip is 2mm, and the distance between adjacent lithium strips is 2 mm.
Example 3: the ultra-thin lithium bar preform prepared in example 1 was used as a raw material to prepare an ultra-thin lithium bar preform having a copper foil as a carrier layer.
The ultra-thin lithium bar preform prepared in example 1 was used as a starting material; the carrier layer used was a copper foil having a thickness of 8 μm and a width of 120 mm.
Referring to fig. 5, a roll of ultra-thin lithium bar preform PL is mounted on an unwinding roll 20 such that the side provided with the ultra-thin lithium bars is disposed opposite to the copper foil, and the ultra-thin lithium bar preform PL passes through a back-up roll 21 and enters a roll. The copper foil coil CN is mounted on the unwinding shaft 22 and directly enters a roller after unwinding. Rolling under the rolling pressure of 8 MPa; separating the original supporting layer P of the ultrathin lithium bar prefabricated member PL after rolling, and finishing the rolling process of the separated supporting layer P by a rolling shaft 26; the ultra-thin lithium strip and the new prefabricated member formed by the copper foil after the separation are wound by using a winding shaft 17.
Measuring the thickness of the new ultrathin lithium bar prefabricated member obtained by the method, wherein the total thickness is about 13.1 mu m, the thickness of the copper foil is removed, and the thickness of the pure lithium layer is about 5.1 mu m; the pore diameter is about 30-100 μm, the porosity is 4.5%, the width of a single lithium strip is 2mm, and the distance between adjacent lithium strips is 2 mm.
Example 4: a composite negative electrode was prepared using the ultra-thin lithium bar preform prepared in example 1 as a raw material.
The ultra-thin lithium bar preform prepared in example 1 was used as a raw material, and had a total thickness of about 35.2 μm, a carrier layer width of 120mm, and an ultra-thin lithium bar width of 100 mm; the total thickness of the negative electrode assembly used was about 100 μm, the total width was 120mm, and the negative electrode coating width was 100 mm.
Referring to fig. 5, a roll of ultra-thin lithium bar preform PL is mounted on an unwind reel 20, and the ultra-thin lithium bar preform PL passes through a back-up roll 21 and enters a nip roll. The negative electrode component CN is mounted on the unwinding shaft 22, and directly enters the roller after unwinding. The side of the ultrathin lithium bar preform PL provided with the ultrathin lithium bars is arranged opposite to the side provided with the negative electrode coating on the negative electrode component CN. Rolling under the rolling pressure of 8 MPa; separating the original supporting layer P of the ultrathin lithium bar prefabricated member PL after rolling, and finishing the rolling process of the separated supporting layer P by a rolling shaft 26; and compounding the separated ultrathin lithium strips and the negative component CN together to obtain a composite negative electrode CNL, and winding the formed composite negative electrode CNL by using a winding shaft 17.
The composite negative electrode CNL obtained as described above was measured to have a total thickness of about 105.1 μm.
The above examples and manufacturing processes are for the purpose of more clearly describing the invention, and the manufacturing processes and equipment may be simplified, complicated or modified according to specific requirements. For example, by modifying the equipment, 2 or more rolls of ultra-thin lithium strip preforms can be produced simultaneously. For another example, the preparation process and method of the composite negative electrode are improved and integrated, so that the composite negative electrode can be integrated and connected with lithium battery negative electrode coating or other related equipment. Such similar improvements, integration, should be considered part of the present invention.
According to the ultrathin lithium strip prefabricated part and the composite negative electrode provided by the invention, the adjacent ultrathin lithium strips are spaced by a material removing method, so that the relative thickness is reduced, the aim of more accurately controlling the lithium loading amount per unit area is fulfilled, and the requirement of accurately controlling the lithium supplement amount of the negative electrode of the battery is met.
The practical effects of the ultra-thin lithium strip preform with micropores according to the present invention will be described in detail with reference to the following specific examples.
Example 5: preparing battery by carrying out negative pole prelithiation by using ultrathin lithium strip with micropore and relative thickness of 2.6 micrometers
Lithium cobaltate is used as a positive electrode, and the thickness of an active layer is 80 microns; the diaphragm is a polypropylene microporous film (Celgard 2500); the electrolyte is LiPF6EC: DMCC (volume ratio 1:1, EC: ethylene carbonate, DMC: dimethyl carbonate, Taxus chinensis Battery materials Co., Ltd.), electrolyte additive: 10 wt% FEC (FEC: fluoroethylene carbonate, Roche Kagaku Kogyo Co., Ltd.); the cathode is a silicon-carbon cathode, the thickness of the active layer is 50 micrometers, and the ultrathin lithium strip preform prepared in example 1 is compounded on the surface of the cathode. And preparing the soft package battery with the capacity of 1Ah by adopting a lamination process. And (5) standing the formed battery cell for 12 hours, and performing capacity grading formation by adopting 0.05C current.
Comparative example 1: preparation of battery by carrying out negative pole prelithiation by using ultrathin lithium strip with relative thickness of 2.5 micrometers
Lithium cobaltate is used as a positive electrode, and the thickness of an active layer is 80 microns; the diaphragm is a polypropylene microporous film (Celgard 2500); the electrolyte is LiPF6EC: DMCC (volume ratio 1:1, EC: ethylene carbonate, DMC: dimethyl carbonate, Taxus chinensis Battery materials Co., Ltd.), electrolyte additive: 10 wt% FEC (FEC: fluoroethylene carbonate, Rong-Rough-Tree high New)Materials incorporated); the negative electrode is a silicon-carbon negative electrode, the thickness of the active layer is 50 microns, and an ultrathin lithium strip with the relative thickness of 2.6 microns is compounded on the surface of the negative electrode (the preparation method is the same as that of the embodiment 1, except that an anti-sticking film adopted in the preparation process does not have salient points). And preparing the soft package battery with the capacity of 1Ah by adopting a lamination process. And (5) standing the formed battery cell for 12 hours, and performing capacity grading formation by adopting 0.05C current.
Comparative example 2: preparation of battery by using 5 micron ultrathin lithium strip to carry out negative electrode prelithiation
Lithium cobaltate is used as a positive electrode, and the thickness of an active layer is 80 microns; the diaphragm is a polypropylene microporous film (Celgard 2500); the electrolyte is LiPF6-EC: DMCC (volume ratio is 1:1, EC: ethylene carbonate, DMC: dimethyl carbonate, China fir battery materials Co., Ltd.), and the electrolyte additive: 10 wt% FEC (FEC: fluoroethylene carbonate, Roche Kagaku Kogyo Co., Ltd.); the negative electrode is a silicon-carbon negative electrode, the thickness of the active layer is 50 microns, and an ultrathin lithium belt with the thickness of 5 microns is compounded on the surface of the negative electrode (the preparation method is the same as that of the comparative example 1, except that a scraper is not used for removing materials after the ultrathin lithium belt is prepared). And preparing the soft package battery with the capacity of 1Ah by adopting a lamination process. And (5) standing the formed battery cell for 12 hours, and performing capacity grading formation by adopting 0.05C current.
The batteries of example 5 and comparative examples 1 and 2 were disassembled, and the negative electrodes of the disassembled batteries are shown in fig. 6 to 8. It can be seen that with the negative electrode prelithiated with the ultra-thin lithium bar preform prepared in example 1, no metallic lithium was observed on the surface; a cathode pre-lithiated by adopting an ultrathin lithium strip with the relative thickness of 2.6 microns and without micropores has a small amount of metal lithium on the surface; the cathode pre-lithiated by using the 5 micron ultrathin lithium tape still has obvious metal lithium on the surface, which shows that the lithium cannot be completely consumed due to the fact that the content of the metal lithium with the thickness of 5 microns in the cathode pre-lithiation is too high.
It should be understood that the above-mentioned embodiments are merely preferred embodiments of the present invention, and not intended to limit the present invention, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An ultra-thin lithium bar preform, characterized in that said preform has:
the supporting layer is a strip with the width of 3-2000 mm; and
and a plurality of ultra-thin lithium strips which are positioned on at least one surface of the support layer and combined with the support layer, wherein the plurality of ultra-thin lithium strips are more than 2 ultra-thin lithium strips which extend in the length direction of the support layer and are separated from each other in the width direction of the support layer, the width of each ultra-thin lithium strip is in the range of 1-200mm, the thickness of each ultra-thin lithium strip is uniform and is in the range of 0.5-15 μm, and each ultra-thin lithium strip has through holes with the aperture of 5-1000 μm, the porosity is less than 50%, and the distance between adjacent ultra-thin lithium strips is 0.5-10 mm.
2. The ultra-thin lithium bar preform of claim 1, wherein: the single ultrathin lithium strip meets at least one of the following conditions:
the aperture of the through hole is 100-500 microns;
porosity of 0.5-10%, preferably 1% -5%;
the width is 1-50 mm;
the thickness is 1-10 microns.
3. The ultra-thin lithium bar preform of claim 1, wherein: the ultrathin lithium strip is a lithium metal or lithium alloy product, and preferably, the lithium alloy comprises a lithium aluminum alloy, a lithium magnesium alloy, a lithium boron alloy, a lithium indium alloy and a lithium silicon alloy.
4. The ultra-thin lithium bar preform of claim 1, wherein: the supporting layer is a single layer or multiple layers prepared from the following materials:
polymers including polyolefins (polyethylene, polypropylene, polystyrene), polyesters;
inorganic oxides including aluminum oxide;
inorganic conductors including graphite, carbon nanotubes, graphene;
metals, including copper, aluminum.
5. A composite anode, characterized by: the composite anode includes:
a current collector;
a negative electrode coating on a surface of the current collector; and
an ultrathin lithium strip compounded on one surface of the negative coating layer far away from the current collector,
wherein the ultra-thin lithium strip is obtained by removing the support layer from the ultra-thin lithium strip preform of any one of claims 1 to 4.
6. A method of making the ultra-thin lithium bar preform of any one of claims 1-4, characterized by: the method is a roll-to-roll continuous production method, a metal lithium strip with the thickness of 5-200 mu m is used as a raw material, one surface of the metal lithium strip is attached to a salient point anti-sticking base material, the other surface of the metal lithium strip is attached to a supporting layer and then enters a roller, the salient point anti-sticking base material and the metal lithium strip are peeled after rolling to obtain an ultrathin lithium strip supported by the supporting layer, then a part of the metal lithium strip of the ultrathin lithium strip supported by the supporting layer is removed to form ultrathin lithium strips with intervals, and the ultrathin lithium strip prefabricated member is obtained.
7. The method of claim 6, wherein: the one side that bump antiseized substrate and metallic lithium contacted possesses antiseized coating, and bump antiseized membrane possesses a plurality of punctiform archs of unevenness.
8. A method of making the composite anode of claim 5, characterized by: the method is a roll-to-roll continuous production method, and the ultrathin lithium strip preform of any one of claims 1 to 4 is used as a raw material, and the ultrathin lithium strip is transferred from a support body to a negative electrode coating by a roller pressure composite transfer method.
9. A battery comprising a positive electrode and a negative electrode disposed in opposition, wherein the negative electrode comprises the ultra-thin lithium strip preform of any one of claims 1-4 or the composite negative electrode of claim 5.
10. The battery of claim 9, wherein the battery comprises a lithium metal battery, an all-solid-state battery, a lithium sulfur battery, or a lithium air battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010558625.5A CN113823760A (en) | 2020-06-18 | 2020-06-18 | Ultrathin lithium strip prefabricated member, composite negative electrode, preparation method of composite negative electrode and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010558625.5A CN113823760A (en) | 2020-06-18 | 2020-06-18 | Ultrathin lithium strip prefabricated member, composite negative electrode, preparation method of composite negative electrode and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113823760A true CN113823760A (en) | 2021-12-21 |
Family
ID=78911664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010558625.5A Pending CN113823760A (en) | 2020-06-18 | 2020-06-18 | Ultrathin lithium strip prefabricated member, composite negative electrode, preparation method of composite negative electrode and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113823760A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114030929A (en) * | 2022-01-10 | 2022-02-11 | 天津中能锂业有限公司 | Pole piece strip-shaped interval pre-lithiation device |
| CN114335432A (en) * | 2021-12-31 | 2022-04-12 | 珠海冠宇电池股份有限公司 | Metal lithium belt, negative plate and battery |
| CN114361398A (en) * | 2022-01-10 | 2022-04-15 | 天津中能锂业有限公司 | Method for producing lithium-doped negative electrode and lithium-doped negative electrode |
| CN114464772A (en) * | 2022-02-16 | 2022-05-10 | 星恒电源股份有限公司 | Pole piece and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1177417A (en) * | 1995-03-06 | 1998-03-25 | 富士摄影胶片株式会社 | Nonaqueous secondary cell |
| CN109728306A (en) * | 2018-11-23 | 2019-05-07 | 湖南立方新能源科技有限责任公司 | A kind of benefit lithium cathode sheet and preparation method thereof, lithium ion battery |
| CN210123779U (en) * | 2019-06-28 | 2020-03-03 | 天津中能锂业有限公司 | Through-hole lithium film prefabricated part, composite negative electrode and energy storage device |
| CN210136957U (en) * | 2019-07-05 | 2020-03-10 | 宁德时代新能源科技股份有限公司 | Mechanism for forming lithium film and device for supplementing lithium to pole piece |
-
2020
- 2020-06-18 CN CN202010558625.5A patent/CN113823760A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1177417A (en) * | 1995-03-06 | 1998-03-25 | 富士摄影胶片株式会社 | Nonaqueous secondary cell |
| CN109728306A (en) * | 2018-11-23 | 2019-05-07 | 湖南立方新能源科技有限责任公司 | A kind of benefit lithium cathode sheet and preparation method thereof, lithium ion battery |
| CN210123779U (en) * | 2019-06-28 | 2020-03-03 | 天津中能锂业有限公司 | Through-hole lithium film prefabricated part, composite negative electrode and energy storage device |
| CN210136957U (en) * | 2019-07-05 | 2020-03-10 | 宁德时代新能源科技股份有限公司 | Mechanism for forming lithium film and device for supplementing lithium to pole piece |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114335432A (en) * | 2021-12-31 | 2022-04-12 | 珠海冠宇电池股份有限公司 | Metal lithium belt, negative plate and battery |
| CN114335432B (en) * | 2021-12-31 | 2024-08-27 | 珠海冠宇电池股份有限公司 | Metal lithium belt, negative plate and battery |
| CN114030929A (en) * | 2022-01-10 | 2022-02-11 | 天津中能锂业有限公司 | Pole piece strip-shaped interval pre-lithiation device |
| CN114361398A (en) * | 2022-01-10 | 2022-04-15 | 天津中能锂业有限公司 | Method for producing lithium-doped negative electrode and lithium-doped negative electrode |
| CN114361398B (en) * | 2022-01-10 | 2024-01-30 | 天津中能锂业有限公司 | Method for preparing lithium-supplementing negative electrode and lithium-supplementing negative electrode |
| CN114464772A (en) * | 2022-02-16 | 2022-05-10 | 星恒电源股份有限公司 | Pole piece and preparation method thereof |
| CN114464772B (en) * | 2022-02-16 | 2024-04-26 | 星恒电源股份有限公司 | Pole piece and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113823760A (en) | Ultrathin lithium strip prefabricated member, composite negative electrode, preparation method of composite negative electrode and battery | |
| US8927068B2 (en) | Methods to fabricate variations in porosity of lithium ion battery electrode films | |
| TWI762679B (en) | Olefin separator free li-ion battery | |
| KR101913338B1 (en) | Lithium metal anode comprising Langmuir-Blodgett layer, battery comprising the same, and preparation method thereof | |
| CN210123779U (en) | Through-hole lithium film prefabricated part, composite negative electrode and energy storage device | |
| WO2021253318A1 (en) | Ultrathin lithium bar preform, composite negative electrode, manufacturing method therefor, and battery | |
| JP7316772B2 (en) | Copper foil used for lithium secondary battery current collector | |
| JP2020534651A (en) | Lithium anode device stack manufacturing | |
| KR20120113222A (en) | Compressed powder 3d battery electrode manufacturing | |
| TWI714594B (en) | Battery separator with dielectric coating | |
| JP7537791B2 (en) | Ultra-thin lithium film laminate and its manufacturing method | |
| JP2010027673A (en) | Method and device for manufacturing sheet electrode | |
| CN209822779U (en) | Ultrathin lithium foil and device for preparing ultrathin lithium foil | |
| CN116826025B (en) | Lithium composite and method for producing same | |
| CN113258044B (en) | Ultralight three-dimensional framework metal lithium complex and preparation method thereof | |
| WO2020258842A1 (en) | Ultra-thin lithium film preform and preparation method therefor | |
| KR100985241B1 (en) | Current collector, electrode, and non-aqueous electrolyte secondary battery | |
| US20230006242A1 (en) | Porous ceramic separator materials and formation processes | |
| CN113497217B (en) | Electrode, preparation method thereof and battery | |
| CN112151283B (en) | Lithium ion capacitor negative electrode prelithiation method, composite negative electrode and lithium ion capacitor | |
| CN114597331A (en) | Ultrathin lithium film complex and preparation method thereof | |
| JP2009123402A (en) | Method of manufacturing negative electrode for lithium secondary battery | |
| JP2008010419A (en) | Manufacturing method of electrode for electrochemical element, and electrochemical element including it | |
| CN216928627U (en) | Lithium-copper composite belt, lithium-copper composite negative electrode and battery | |
| US20240170643A1 (en) | Method of fabricating a pre-lithiated electrode and lithium-ion battery cell |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211221 |