CN114388742B - Lithium supplementing method, negative electrode plate and secondary battery - Google Patents

Lithium supplementing method, negative electrode plate and secondary battery Download PDF

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CN114388742B
CN114388742B CN202111604151.4A CN202111604151A CN114388742B CN 114388742 B CN114388742 B CN 114388742B CN 202111604151 A CN202111604151 A CN 202111604151A CN 114388742 B CN114388742 B CN 114388742B
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lithium
sheet
supplementing
vacuum degree
negative electrode
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CN114388742A (en
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朱登伟
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Hunan Lifang New Energy Science and Technology Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—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
    • H01M4/04—Processes of manufacture in general
    • H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • 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

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  • 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)
  • Secondary Cells (AREA)

Abstract

The invention belongs to the technical field of secondary batteries, and particularly relates to a lithium supplementing method and a secondary battery, wherein the lithium supplementing method comprises the following steps: s1, coating an active material on the surface of a negative electrode current collector, and drying to obtain a pretreatment sheet; s2, selecting a metal lithium sheet, stacking the metal lithium sheet and the pretreatment sheet, placing the metal lithium sheet and the pretreatment sheet into a sealed box, heating the sealed box, and adjusting the first vacuum degree; step S3, introducing solvent vapor into the sealed box, adjusting the second vacuum degree, and standing at constant pressure; and S4, regulating the third vacuum degree, and standing at constant pressure to obtain the lithium-supplementing negative plate. The lithium supplementing method disclosed by the invention can be used for conveniently and rapidly supplementing the lithium to the negative electrode in a large scale, the active substance is not influenced after the lithium is supplemented, the lithium is uniformly and rapidly supplemented, the active substance is not easy to fall off, the obtained lithium supplementing pole piece can be directly subjected to the next working procedure, and the time cost is greatly saved.

Description

Lithium supplementing method, negative electrode plate and secondary battery
Technical Field
The invention belongs to the technical field of secondary batteries, and particularly relates to a lithium supplementing method, a negative electrode plate and a secondary battery.
Background
Electronic products bring great convenience to people, such as mobile phones, bluetooth headsets, electronic watches and the like, so that the requirement of high-energy-density batteries is also growing. Currently, most lithium batteries adopt graphite as a negative electrode, and the capacity of commercial graphite reaches 360mAh/g, which is already close to the theoretical limit capacity of the lithium battery, but the energy density of the lithium battery only stays at the level of 320 wh/kg. In order to obtain higher energy density batteries, researchers have developed metallic lithium as the negative electrode, and lithium batteries can have energy densities as high as 450Wh/kg based on capacities of up to 3860mah/g of metallic lithium. However, lithium metal is an active alkali metal, is easy to burn and causes danger, and has extremely high processing and storage requirements, which limit the large-scale application of the lithium metal. Another material, silicon, also has a capacity of up to 4200mAh/g, is a current research focus. However, the initial efficiency of silicon is low and the volume expansion after lithium intercalation is as high as 300%, which results in poor cycle performance. In order to solve the problem, current researchers use silicon doped in graphite and add lithium supplementing materials to improve the initial efficiency, so that a lithium battery with high energy density can be obtained.
The lithium supplementing methods are various, and the patents CN202011076665.2, CN202110410821.2, CN201621435710.8 and the like provide rolling equipment for rolling pole pieces, belong to physical lithium supplementing methods, have extremely high physical environment requirements for rolling lithium, and are easy to be dangerous otherwise. The patent CN201911357946.2 is characterized in that metal lithium is placed in a battery and isolated by an isolating film, and lithium is supplemented by evolution of small current. CN201811010154.3 sets up one deck metallic lithium and assembles into the electric core with the positive pole piece on the negative pole diaphragm surface, then puts into the organic solvent and soaks the electric core, packs and annotates liquid and makes the electric core afterwards, and this method can solve above-mentioned problem, but the electric core takes place the active material after soaking in the solvent and peels off easily, the drying after soaking packs again and annotates liquid again, and the operation process is complicated.
Disclosure of Invention
One of the objects of the present invention is: aiming at the defects of the prior art, the lithium supplementing method is convenient and quick to prepare, is not easy to fall off after lithium supplementing, can directly perform procedures such as lamination or winding, and saves time cost.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a lithium supplementing method comprising the steps of:
step S1, coating a negative electrode active material on the surface of a negative electrode current collector, and drying to obtain a pretreatment sheet;
s2, selecting a metal lithium sheet, stacking the metal lithium sheet and the pretreatment sheet, placing the metal lithium sheet and the pretreatment sheet into a sealed box, heating the sealed box, and adjusting the first vacuum degree;
step S3, introducing solvent vapor into the sealed box, adjusting the second vacuum degree, and standing at constant pressure;
and S4, regulating the third vacuum degree, and standing at constant pressure to obtain the lithium-supplementing negative plate.
According to the invention, the metal lithium sheet and the pretreatment sheet are stacked, the vacuum is pumped, the vaporous solvent is added, the vaporous solvent enters between the metal lithium sheet and the pretreatment sheet under the action of void pressure difference and capillary force, and the pretreatment sheet is infiltrated, so that an ion channel is formed between the metal lithium sheet and the pretreatment sheet, and the metal lithium sheet supplements lithium for the pretreatment sheet. The method does not need a large amount of solvent for soaking, saves raw materials, saves a drying step after soaking, can carry out the next procedure of preparing the secondary battery after supplementing lithium in vacuum, and greatly improves the production efficiency.
The lithium supplementing method is simple, easy to operate, suitable for mass production, suitable for various processes such as winding, lamination and the like, suitable for batteries such as soft packages, square aluminum shells, cylinders and the like, suitable for positive and negative electrodes and electrolyte, and also suitable for batteries of other systems such as sodium ion batteries and the like.
The lithium supplementing method further comprises the steps of detecting the prepared lithium supplementing negative electrode sheet, observing the metal lithium quantity on the surface of the electrode sheet, and judging whether the metal lithium quantity gradually decreases, if the metal lithium quantity is more, repeating the step S3 and the step S4 until the metal lithium gradually disappears. The number of times of repeating step S3 and step S4 may be 1, 2, 3, 4,5, etc.
Preferably, in the step S2, a pressure is set between the metallic lithium sheet and the pretreatment sheet, and the pressure is 0.01MPa to 5.0MPa. The pressure is set between the metal lithium sheet and the pretreatment sheet, so that the metal lithium sheet and the pretreatment sheet are fully contacted, and the ion channel is formed between the metal lithium sheet and the pretreatment sheet by the subsequent solvent vapor. Preferably the pressure is 0.2-0.5MPa.
Preferably, the heating temperature in the step S2 is 45-280 ℃. And setting a certain temperature to keep the solvent in a gas state, and improving the rate of solvent vapor entering between the pretreatment sheet and the metal lithium sheet. Preferably, the heating temperature is 80℃to 150 ℃.
Preferably, the vacuum degree of the vacuum pumped in the step S2 is 10Pa-50KPa, the vacuum degree in the step S3 is 10Pa-50KPa, and the vacuum degree in the step S4 is 80KPa-101.325KPa. And in the three steps, the sealing box is subjected to three-time vacuum degree adjustment, so that the gaseous solvent can be rapidly arranged between the pole piece substrate and the metal lithium piece.
Preferably, the standing time in the step S3 is 5-6000min, and the standing time in the step S4 is 5-6000min. And standing for a period of time under a certain vacuum degree, so that the gas solvent can enter the metal lithium sheet and the pretreatment sheet.
Preferably, in the step S2, there are one or two pieces of metal lithium pieces, and when two pieces of metal lithium pieces are provided, the metal lithium pieces, the pretreatment piece and the metal lithium piece are sequentially stacked. Preferably, the metallic lithium sheet, the pretreatment sheet, the metallic lithium sheet, and the separator are sequentially stacked. The isolating layer is a PET, PE, PP, PI and other polymer plastic sheet, the thickness of the sheet is 0.002-5.0 mm, the area is not smaller than that of the metal lithium sheet, and the metal lithium sheet can be completely covered.
Preferably, the solvent in the step S3 includes lithium salt and one or more of ethylene carbonate, propylene carbonate, fluoroethylene carbonate, vinylene carbonate, ethylene carbonate, propane sultone, butane sultone, propenyl-1, 3-sultone, ethylene sulfite, propylene sulfite, ethylene sulfate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, methyl propyl carbonate, methyl formate, ethyl formate, methyl acetate, ethyl propionate, propyl propionate, ethyl butyrate, propyl butyrate, butylene carbonate, gamma-butyrolactone, and tetrahydrofuran. The solvent contains organic lithium salt, so that the electronic conductivity of metal lithium and the pole piece can be increased, and the lithium supplementing speed can be improved; of course, a solvent without lithium salt may also be used because metallic lithium is in direct contact with the pole piece, with both electron and ion channels.
Preferably, the lithium salt is one or a mixture of several of lithium chlorate, lithium tetrafluoroborate, lithium hexafluoroarsenate, lithium hexafluorophosphate, lithium bisoxalato borate, lithium difluorophosphate, lithium oxalato difluoroborate, lithium bistrifluoromethylsulfonimide, lithium bisfluorosulfonylimide, lithium difluorophosphate and lithium 4, 5-dicyano-2-trifluoromethylimidazole.
Specifically, the lithium salt may be one or a mixture of more of lithium perchlorate, lithium difluorophosphate, lithium difluorobis (oxalato) phosphate, lithium tetrafluoro (oxalato) phosphate, lithium bisoxalato borate, lithium difluorooxalato borate, lithium tetrafluoro borate, lithium hexafluorophosphate, lithium difluorosulfonimide salt and lithium difluorosulfonimide.
The second object of the present invention is: aiming at the defects of the prior art, the negative plate is provided with high energy density, simple structure and easy production.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a negative electrode sheet is prepared by the lithium supplementing method. The negative plate after lithium supplement has higher energy density and better electrochemical performance.
The third object of the present invention is to: in response to the shortcomings of the prior art, a secondary battery having a high energy density is provided.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a secondary battery comprises the negative plate. Specifically, the secondary battery comprises a positive plate, a diaphragm, electrolyte, a shell and the negative plate. The diaphragm separates the positive plate and the negative plate, the metal lithium plate in the negative plate is arranged on one side close to the diaphragm, and the shell body is used for installing the electrolyte, the positive plate, the diaphragm and the negative plate. The secondary battery may be a sodium ion battery, a lithium ion battery, or the like. And is also suitable for batteries such as soft package, square aluminum shell, cylinder, etc.
The positive plate comprises a positive current collector and a positive active material arranged on at least one surface of the positive current collector, wherein the positive active material comprises one or a mixture of more of lithium cobaltate, lithium manganate, lithium nickelate, lithium nickel manganate, lithium iron phosphate, lithium manganese iron phosphate and the like.
The negative electrode plate comprises a negative electrode current collector and a negative electrode active material arranged on at least one surface of the negative electrode current collector, wherein the negative electrode active material comprises a carbon-based negative electrode material; more preferably, the carbon-based negative electrode material may be one or more selected from natural graphite, artificial graphite, soft carbon, hard carbon, mesophase carbon microspheres, nanocarbon, and carbon fibers. The negative electrode active material may include one or more of a silicon-based material, a tin-based material, and lithium titanate, in addition to the carbon-based negative electrode material. Preferably, the silicon-based material is selected from one or more of elemental silicon, silicon oxygen compound, silicon carbon compound and silicon alloy, and the tin-based material is selected from one or more of elemental tin, tin oxygen compound, tin carbon compound and tin alloy. Preferably, the negative electrode active material is a mixture of natural graphite and silicon oxide in a mass ratio of 5:1.
Compared with the prior art, the invention has the beneficial effects that: the lithium supplementing method disclosed by the invention can be used for conveniently and rapidly supplementing the lithium to the negative electrode in a large scale, the active substance is not influenced after the lithium is supplemented, the lithium is uniformly and rapidly supplemented, the active substance is not easy to fall off, the obtained lithium supplementing pole piece can be directly subjected to the next working procedure, and the time cost is greatly saved.
Detailed Description
The present invention will be described in further detail with reference to the following specific embodiments, but the embodiments of the present invention are not limited thereto.
Example 1
A lithium supplementing method comprising the steps of:
s1, coating an active material on the surface of a negative electrode current collector, and drying to obtain a pretreatment sheet;
s2, selecting a metal lithium sheet, stacking the metal lithium sheet and the pretreatment sheet, placing the metal lithium sheet and the pretreatment sheet into a sealed box, heating the sealed box, and adjusting the first vacuum degree;
step S3, introducing solvent vapor into the sealed box, adjusting the second vacuum degree, and standing at constant pressure;
and S4, regulating the third vacuum degree, and standing at constant pressure to obtain the lithium-supplementing negative plate.
Wherein the production time used in the steps is 30 hours.
Wherein, in the step S2, the metal lithium sheet and the pretreatment sheet are laminated and set with pressure of 2.5MPa.
Wherein the heating temperature in step S2 is 90 ℃.
Wherein, the first vacuum degree in the step S2 is 250Pa, the second vacuum degree in the step S3 is 200Pa, and the third vacuum degree in the step S4 is 101.325KPa.
Wherein, the standing time in the step S3 is 60min, and the standing time in the step S4 is 100min.
In the step S2, two metal lithium sheets are provided, and the metal lithium sheets, the pretreatment sheet and the metal lithium sheet are sequentially stacked.
Wherein the solvent is lithium hexafluorophosphate and ethylene carbonate; the negative current collector is copper foil.
Example 2
The difference from example 1 is that: the metal lithium sheet is provided with one sheet, and the metal lithium sheet and the pretreatment sheet are sequentially laminated.
The remainder is the same as in example 1 and will not be described again here.
Example 3
The difference from example 1 is that: the first vacuum degree in the step S2 is 80Pa, the second vacuum degree in the step S3 is 120Pa, and the third vacuum degree in the step S4 is 80KPa.
The remainder is the same as in example 1 and will not be described again here.
Example 4
The difference from example 1 is that: the first vacuum degree in the step S2 is 90Pa, the second vacuum degree in the step S3 is 160Pa, and the third vacuum degree in the step S4 is 85KPa.
The remainder is the same as in example 1 and will not be described again here.
Example 5
The difference from example 1 is that: the first vacuum degree in the step S2 is 60Pa, the second vacuum degree in the step S3 is 250Pa, and the third vacuum degree in the step S4 is 90KPa.
The remainder is the same as in example 1 and will not be described again here.
Example 6
The difference from example 1 is that: the first vacuum degree in the step S2 is 80Pa, the second vacuum degree in the step S3 is 260Pa, and the third vacuum degree in the step S4 is 100KPa.
The remainder is the same as in example 1 and will not be described again here.
Example 7
The difference from example 1 is that: in the step S2, no pressure is arranged between the metal lithium sheet and the pretreatment sheet, and the heating temperature in the step S2 is 160 ℃.
The remainder is the same as in example 1 and will not be described again here.
Example 8
The difference from example 1 is that: the pressure between the metal lithium sheet and the pretreatment sheet in the step S2 is 0.5MPa, and the heating temperature in the step S2 is 160 ℃.
The remainder is the same as in example 1 and will not be described again here.
Example 9
The difference from example 1 is that: the pressure between the metal lithium sheet and the pretreatment sheet in the step S2 is 2.5MPa, and the heating temperature in the step S2 is 220 ℃.
The remainder is the same as in example 1 and will not be described again here.
Example 10
The difference from example 1 is that: the pressure between the metal lithium sheet and the pretreatment sheet in the step S2 is 4.5MPa, and the heating temperature in the step S2 is 250 ℃.
The remainder is the same as in example 1 and will not be described again here.
Comparative example 1
Coating a negative electrode active material on the surface of a negative electrode current collector, drying to obtain a pretreatment sheet, soaking the pretreatment sheet and a metal lithium sheet in electrolyte, and standing to obtain the lithium supplementing negative electrode sheet.
Performance test: the time taken for the preparation of examples 1 to 10 and comparative example 1 was counted, and the prepared lithium ion battery was subjected to 300 charge and discharge tests, recording capacity retention, and test results were recorded in table 1.
TABLE 1
As can be seen from the above Table 1, the lithium-supplementing pole piece prepared by the lithium-supplementing method of the present invention has a better capacity retention rate than the lithium-supplementing pole piece prepared by the comparative example 1, and the production time is shorter, thus greatly saving the production efficiency. As is clear from the comparison between the example 1 and the example 2, when two metal lithium sheets are provided, the lithium supplementing effect is better and the capacity retention rate is higher. As shown by comparison of examples 1 and 3-5, when the vacuum degree of the vacuumizing in the step S2 is set to be 250Pa, the vacuum degree in the step S3 is set to be 200Pa, and the vacuum degree in the step S4 is set to be 101.325KPa, namely, the metal lithium sheet and the pretreatment sheet are placed in environments with different vacuum degrees to be kept stand, so that the lithium supplementing effect is improved. As is apparent from the comparison of examples 1, 7 to 10, the secondary battery prepared had a better capacity retention rate when a pressure of 2.5MPa was set between the metallic lithium sheet and the pretreatment sheet and the heating temperature was set to 90 ℃.
Variations and modifications of the above embodiments will occur to those skilled in the art to which the invention pertains from the foregoing disclosure and teachings. Therefore, the present invention is not limited to the above-described embodiments, but is intended to be capable of modification, substitution or variation in light thereof, which will be apparent to those skilled in the art in light of the present teachings. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present invention in any way.

Claims (8)

1. The lithium supplementing method is characterized by comprising the following steps of:
s1, coating an active material on the surface of a negative electrode current collector, and drying to obtain a pretreatment sheet;
s2, selecting a metal lithium sheet, stacking the metal lithium sheet and the pretreatment sheet, placing the metal lithium sheet and the pretreatment sheet into a sealed box, heating the sealed box, and adjusting the first vacuum degree to 10Pa-50KPa;
s3, introducing solvent vapor into a sealed box, regulating the second vacuum degree to be 10Pa-50KPa, and standing at constant pressure, wherein the solvent vapor comprises lithium salt and one or more of ethylene carbonate, propylene carbonate, fluoroethylene carbonate, ethylene carbonate, propylene sultone, butylsultone, propenyl-1, 3-sultone, ethylene sulfite, propylene sulfite, ethylene sulfate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, methyl propyl carbonate, methyl formate, ethyl formate, methyl acetate, ethyl propionate, propyl propionate, ethyl butyrate, propyl butyrate, butylene carbonate, gamma-butyrolactone and tetrahydrofuran;
and S4, regulating the third vacuum degree to be 80KPa-101.325KPa, and standing at constant pressure to obtain the lithium supplementing negative plate.
2. The lithium supplementing method according to claim 1, wherein when the step S2 is laminated, a pressure of 0.01MPa to 5.0MPa is set between the metal lithium sheet and the pretreatment sheet.
3. The lithium supplementing method according to claim 1 or 2, wherein the temperature of heating in the step S2 is 45 ℃ to 280 ℃.
4. The lithium supplementing method according to claim 1, wherein the standing time in the step S3 is 5-6000min, and the standing time in the step S4 is 5-6000min.
5. The lithium supplementing method according to claim 1, wherein the metallic lithium sheet in the step S2 is provided with one or two sheets.
6. The lithium supplementing method according to claim 1, wherein the lithium salt is one or a mixture of several of lithium chlorate, lithium tetrafluoroborate, lithium hexafluoroarsenate, lithium hexafluorophosphate, lithium bisoxalato borate, lithium oxalato difluoroborate, lithium bistrifluoromethylsulfonimide, lithium difluorophosphate and lithium 4, 5-dicyano-2-trifluoromethylimidazole.
7. A negative electrode sheet, characterized by being produced by the lithium supplementing method according to any one of claims 1 to 6.
8. A secondary battery comprising the negative electrode sheet according to claim 7.
CN202111604151.4A 2021-12-24 2021-12-24 Lithium supplementing method, negative electrode plate and secondary battery Active CN114388742B (en)

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KR20190071301A (en) * 2017-12-14 2019-06-24 주식회사 엘지화학 Method of pre-lithiating anode and Anode obtained therefrom
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10141647A1 (en) * 2000-09-11 2002-04-25 Angewandte Technik Mbh Greifsw Production of electrodes used for a polymer electrolyte membrane electrolytic cell or a fuel cell comprises moistening a polymer electrolyte membrane with solvent or solvent vapor, applying thixotropic screen printing pastes, and tempering
CN105810884A (en) * 2016-05-27 2016-07-27 苏州协鑫集成科技工业应用研究院有限公司 Pole piece and pressing method thereof
KR20190071301A (en) * 2017-12-14 2019-06-24 주식회사 엘지화학 Method of pre-lithiating anode and Anode obtained therefrom
KR20190141915A (en) * 2018-06-15 2019-12-26 주식회사 엘지화학 Method for preparing negative electrode for lithium secondary battery
CN209217136U (en) * 2018-12-27 2019-08-06 陕西煤业化工技术研究院有限责任公司 A kind of continuous prelithiation device of lithium ion cell electrode
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