CN111599990A - Method for prefabricating SEI film on surface of metal lithium cathode - Google Patents

Method for prefabricating SEI film on surface of metal lithium cathode Download PDF

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CN111599990A
CN111599990A CN202010587007.3A CN202010587007A CN111599990A CN 111599990 A CN111599990 A CN 111599990A CN 202010587007 A CN202010587007 A CN 202010587007A CN 111599990 A CN111599990 A CN 111599990A
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lithium
sei film
mass
prefabricating
lithium metal
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陈飞
周翠芳
柴方荣
周建中
李明钧
佘伟华
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Tianneng Shuai Fude Energy 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
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • 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
    • 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
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E60/10—Energy storage using batteries

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Abstract

The invention belongs to the technical field of lithium ion battery cathodes, and particularly relates to a method for prefabricating an SEI film on the surface of a lithium metal cathode, which comprises the following steps: (1) PVDF-HFP and PEO in proportion and mass are added and dissolved in a first solvent, and stirring is carried out at 25-50 ℃ until the materials are completely dissolved; (2) dissolving lithium salt in a second solvent according to a ratio by mass, adding an additive according to a ratio by mass, and performing ultrasonic dispersion for 2-4 hours; (3) mixing the solution obtained in the step (1) and the solution obtained in the step (2), and stirring for 1-2 hours until the viscosity is 3000-6000 cP to obtain viscous liquid; (4) and (4) uniformly coating the viscous fluid liquid obtained in the step (3) on the surface of the lithium battery negative current collector, and drying to obtain the prefabricated SEI film. The prefabricated high-strength elastic SEI film can obviously reduce the lithium consumption of the metal lithium cathode, and can move along with the fluctuation of the surface of the metal lithium without being damaged in the charging and discharging process, thereby preventing the generation of lithium dendrites.

Description

Method for prefabricating SEI film on surface of metal lithium cathode
Technical Field
The invention belongs to the technical field of lithium ion battery cathodes, and particularly relates to a method for preparing a high-strength and elastic SEI film on the surface of a lithium metal cathode.
Background
The lithium ion battery is one of the commonly used secondary batteries, has high energy density and excellent cycle performance, and is the mainstream choice of the current electric automobile battery. The commonly used negative electrode material is graphite, the theoretical capacity is lower and is only 375mAh g-1This has not been able to satisfy the demand for long endurance of mobile energy sources, particularly electric vehicles, and thus, the demand for the development of high energy density batteries is becoming more urgent.
The lithium metal has the lowest reduction potential (-3.04V, for standard hydrogen electrode), and the highest specific capacity of 3860mAh g-1Therefore, the lithium metal is used as the negative electrode, and the battery has the advantage of high energy density. In the 70's of the 20 th century, many inorganic compounds were found to exhibit reversible electrochemical lithium ion deintercalation behavior, and these findings have stimulated research into the use of metallic lithium. In 1972, Exxon led to the use of lithium metal as the negative electrode and TiS2In the case of a positive lithium battery, it was confirmed that the lithium metal battery has good cyclability, but lithium dendrite occurs during a long cycle, i.e., needle-shaped lithium metal grows on the surface of lithium, thereby causing short circuit and ignition of the battery, and the development of a lithium metal secondary battery is thus cut into a bottleneck. In 1989, the company SONY uses petroleum coke as a negative electrode, LiCoO2As the positive electrode, the safety problem of the battery is solved. Through the rapid development of more than 30 years, the performance of the lithium ion battery is remarkably improved, the cost is reduced to a lower level, and the requirement of people on the high-energy-density battery at the present stage cannot be met. Therefore, research on the metal lithium negative electrode is repeated, and the principle, process and the like of the metal lithium battery are deeply researched, so that the contradiction between high energy density and safety of the lithium battery is expected to be solved in principle.
Studies have shown that the failure or safety problems of metallic Li cathodes are mainly due to dendrites formed during the charge-discharge cycle. The formed lithium dendrite penetrates through the diaphragm to cause short circuit in the battery, so that safety accidents are caused; lithium dendrites also react with the electrolyte to form a new SEI film consuming the electrolyte and the lithium dendrites break down upon discharge to form "dead lithium" resulting in reduced cycling performance. Furthermore, metallic Li is accompanied by almost unlimited volume expansion during charge-discharge cycles, which also leads to extreme instability of the surface SEI film, further aggravating the formation of metallic Li dendrites. This infinite volume expansion due to dendrite formation greatly limits the practical application of metallic Li anodes.
Electrodeposited lithium metal is more prone to dendrite growth than other metals because the spontaneously formed SEI film of the lithium metal negative electrode is unstable, leading to cycle stability problems, which are mainly manifested in the following areas:
(1) instability of SEI film; the SEI film spontaneously generated by the reaction of the metallic lithium and the electrolyte has low strength and poor toughness, the SEI film is broken by the separation of the lithium from the support of the metallic lithium during the discharging process, the lithium can be preferentially deposited to form dendrites due to the high reactivity of the broken part of the SEI film, and a new SEI film can be formed on the surfaces of the dendrites of the lithium, so that the instability of the SEI film on the surface of the metallic lithium cathode is far more serious than that of the graphite cathode with the carrier due to vicious cycle in the charging and discharging process; interface gaps are also generated by lithium dissolution in the discharging process, and the electrolyte enters the interface gaps from the damaged part and reacts with the lithium metal to generate a new SEI film. The SEI film formed by the lithium metal and the electrolyte spontaneously has low strength and poor elasticity, and is an important factor causing poor cycle performance of the lithium metal negative electrode, so that a high-strength elastic SEI film needs to be constructed on the surface of the lithium metal.
(2) Instability of the "interfacial spacing"; compared with the graphite cathode, the metallic lithium cathode can generate relatively infinite volume change along with the charging and discharging process, if the single-side specific capacity of the electrode reaches 3mAh & cm for commercial use-2It is necessary to produce a thickness variation of about 14.6 μm, and the resulting "interfacial separation" causes the energy level of the charge transition to rise or even exceed it with difficulty. The microscopic non-uniform dissolution-deposition of metallic lithium also causes variations in surface roughness, resulting in non-uniform "interfacial spacing" that exacerbates lithium dendrite growth. Therefore, a good SEI film should dynamically shift with the movement of the lithium metal surface to minimize the "interfacial distance".
Therefore, solving the problems of safety and interface stability of the lithium metal negative electrode is a key to promote the industrialization of the lithium metal negative electrode. Aiming at the problems of the metal lithium cathode, the invention prepares the high-strength SEI film on the surface of the metal lithium, and the prepared SEI film can move along with the fluctuation of the surface of the metal lithium without being damaged in the charging and discharging process, so that the interface is stabilized, the generation of lithium dendrites is prevented, and the safe and stable work of the metal lithium cathode is realized.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for prefabricating an SEI film with high strength and excellent ionic conductivity on the surface of metallic lithium, and the prefabricated SEI film can move along with the fluctuation of the surface of the metallic lithium without being damaged, stabilizes an interface, prevents lithium dendrite from generating and realizes the safe and stable work of a metallic lithium cathode.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for prefabricating an SEI film on the surface of a lithium metal negative electrode comprises the following steps:
(1) PVDF-HFP (vinylidene fluoride-co-hexafluoropropylene) and PEO (polyethylene oxide) in proportion and mass are added and dissolved in a first solvent, and stirring is carried out at the temperature of 25-50 ℃ until the materials are completely dissolved;
(2) dissolving lithium salt in a second solvent according to a ratio by mass, adding an additive according to a ratio by mass, and performing ultrasonic dispersion for 2-4 hours;
(3) mixing the solution obtained in the step (1) and the solution obtained in the step (2), and stirring for 1-2 hours until the viscosity is 3000-6000 cP to obtain viscous liquid;
(4) and (4) uniformly coating the viscous fluid liquid obtained in the step (3) on the surface of the lithium battery negative current collector, and drying to obtain the prefabricated SEI film.
Preferably, the mass of the first solvent is 100g, the mass of the second solvent is 30-60 g, the mass of PVDF-HFP is 15-30 g, the amount of the lithium salt is 0.05-0.2 mol, the mass of PEO is 0.5-10% of the mass of PVDF-HFP, and the mass of the additive is 0-10 g.
Preferably, the first solvent is one or two selected from N, N-dimethylformamide and N-methylpyrrolidone.
Preferably, the lithium salt is selected from lithium difluorophosphate (LiPO)2F2) Lithium bis (trifluoromethylsulfonyl) imide (LiTFSI), lithium bis (oxalato) borate (LiBOB), lithium difluoro (oxalato) borate (LiODFB), lithium nitrate (LiNO)3) One or more of them.
Preferably, the second solvent is selected from one or two of acetonitrile and acetone.
Preferably, the additive is one of alumina nanopowder or nanowire, titanium oxide nanopowder or nanowire, boron oxide nanopowder or nanowire, silicon carbide nanopowder or nanowire, fumed silica and the like.
Preferably, the negative electrode current collector of the lithium battery is selected from copper foil or lithium foil.
Preferably, the drying conditions are: drying at 40-60 ℃ for 1-2 h, then heating to 100-150 ℃, and vacuum drying for 6-12 h.
Based on one general inventive concept, another object of the present invention is to protect a lithium metal anode manufactured by the above method of prefabricating an SEI film on a surface of the lithium metal anode, and a lithium ion battery including the lithium metal anode.
Compared with the prior art, the invention has the following advantages and positive effects:
the prefabricated SEI film can obviously reduce the lithium consumption of the metal lithium cathode and reduce the cost by more than 40%; the prefabricated SEI film has high strength and certain elasticity, and can move along with the fluctuation of the surface of the lithium metal without being damaged in the charging and discharging process, so that the generation of lithium dendrites is prevented; the prefabricated SEI film can replace the diaphragm currently used, so that the cost of the battery is further reduced; the PEO is blended with the PVDF-HFP, so that the strength of the PVDF-HFP is obviously improved, and meanwhile, the ionic conductivity of the system can be improved. The two solvents have synergistic effect, so that the internal pore size distribution of the prefabricated SEI film is more uniform; the preparation process is simple and can be used for batch production.
Drawings
FIG. 1 Electron microscopy topographic map (1000 times) of pre-formed SEI film of example 1;
FIG. 2 results of the battery cycle life test of example 1;
fig. 3 results of the cycling efficiency test of the button cell of example 1.
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
Example 1
The composition comprises the following components in percentage by mass: 100g of N, N-dimethylformamide, 30g of acetone, 20g g of PVDF-HFP, 0.5g of PEO0, and 9.69g of lithium bis (oxalato) borate (LiBOB) (0.05 mol).
The preparation process of prefabricating the SEI film on the surface of the lithium metal negative electrode comprises the following steps of:
(1) PVDF-HFP (vinylidene fluoride-co-hexafluoropropylene) and PEO (polyethylene oxide) in proportion and mass are added and dissolved in N, N-dimethylformamide, and are stirred at 45 ℃ until the materials are completely dissolved;
(2) dissolving lithium bis (oxalato) borate in the acetone according to the mass ratio, and performing ultrasonic dispersion for 3 hours;
(3) mixing the solution obtained in the step (1) and the solution obtained in the step (2), and stirring for 1.5 hours until the viscosity is 4500cP to obtain viscous liquid;
(4) and (4) uniformly coating the viscous fluid liquid obtained in the step (3) on the surface of the copper foil, drying at 45 ℃ for 2h, heating to 125 ℃, and drying in vacuum for 12h to obtain the prefabricated SEI film.
And (3) taking the copper foil with the prefabricated SEI film as a negative electrode, taking a pole piece prepared from the NCM523 material as a positive electrode, adding a proper amount of electrolyte, and assembling into a battery for testing. The electron microscopy topography of the pre-formed SEI film is shown in fig. 1, and the cycle life test results of the battery are shown in fig. 2. A button cell is prepared by taking copper foil of a prefabricated SEI film as a positive electrode and a lithium sheet as a negative electrode, and lithium is subjected to de-intercalation and de-intercalation cycling, and the test result of the cycling efficiency of the cell is shown in figure 3.
In addition, the viscous fluid liquid is injected into a porous mold, a prefabricated SEI film is prepared according to the same process, and the results of the relevant performance tests are shown in table 1 below.
Example 2
The composition comprises the following components in percentage by mass: 100g of N-methylpyrrolidone, 45g of acetone, PVDF-HFP25g, 0.85g of PEO0, and lithium difluorophosphate (LiPO)2F2)(0.1mol)10.79g。
The preparation process of prefabricating the SEI film on the surface of the lithium metal negative electrode comprises the following steps of:
(1) PVDF-HFP (vinylidene fluoride-co-hexafluoropropylene) and PEO (polyethylene oxide) in proportion and mass are added and dissolved in N-methyl pyrrolidone, and the mixture is stirred at 50 ℃ until the mixture is completely dissolved;
(2) dissolving lithium difluorophosphate in acetone according to the mass ratio, and performing ultrasonic dispersion for 2 hours;
(3) mixing the solution obtained in the step (1) and the solution obtained in the step (2), and stirring for 1.5 hours until the viscosity is 5000cP to obtain viscous and fluid liquid;
(4) and (4) uniformly coating the viscous fluid liquid obtained in the step (3) on the surface of the copper foil, drying at 50 ℃ for 1.5h, heating to 120 ℃, and drying in vacuum for 8h to obtain a prefabricated SEI film.
In addition, the viscous fluid liquid is injected into a porous mold, a prefabricated SEI film is prepared according to the same process, and the results of the relevant performance tests are shown in table 1 below.
Example 3
The composition comprises the following components in percentage by mass: 100g of N, N-dimethylformamide, 50g of acetone, 30g g of PVDF-HFP, 1.5g of PEO1, 19.38g of lithium bis (oxalato) borate (LiBOB) (0.1mol) and 5.0g of titanium oxide nano powder.
The preparation process of prefabricating the SEI film on the surface of the lithium metal negative electrode comprises the following steps of:
(1) PVDF-HFP (vinylidene fluoride-co-hexafluoropropylene) and PEO (polyethylene oxide) in proportion and mass are added and dissolved in N, N-dimethylformamide, and the mixture is stirred at 40 ℃ until the mixture is completely dissolved;
(2) dissolving lithium bis (oxalato) borate in the acetone according to the mass ratio, adding titanium oxide nano powder according to the mass ratio, and performing ultrasonic dispersion for 3 hours;
(3) mixing the solution obtained in the step (1) and the solution obtained in the step (2), and stirring for 1.5h until the viscosity is 4800cP to obtain viscous and fluid liquid;
(4) and (4) uniformly coating the viscous fluid liquid obtained in the step (3) on the surface of the copper foil, drying at 50 ℃ for 1.5h, heating to 125 ℃, and vacuum-drying for 10h to obtain a prefabricated SEI film.
In addition, the viscous fluid liquid is injected into a porous mold, a prefabricated SEI film is prepared according to the same process, and the results of the relevant performance tests are shown in table 1 below.
Example 4
The composition comprises the following components in percentage by mass: 100g of N-methylpyrrolidone, 40g of acetonitrile, 25g g of PVDF-HFP, 2.0g of PEO2, 21.57g of lithium difluorooxalato borate (LiODFB) (0.15mol), and 5.0g of alumina nanopowder.
The preparation process of prefabricating the SEI film on the surface of the lithium metal negative electrode comprises the following steps of:
(1) PVDF-HFP (vinylidene fluoride-co-hexafluoropropylene) and PEO (polyethylene oxide) in proportion and mass are added and dissolved in methyl pyrrolidone, and the mixture is stirred to be completely dissolved at the temperature of 35 ℃;
(2) dissolving lithium bis (oxalato) borate in acetonitrile according to the mass ratio, adding aluminum oxide nano powder in the mass ratio, and performing ultrasonic dispersion for 2.5 hours;
(3) mixing the solution obtained in the step (1) and the solution obtained in the step (2), and stirring for 2 hours until the viscosity is 6000cP to obtain viscous and fluid liquid;
(4) and (4) uniformly coating the viscous fluid liquid obtained in the step (3) on the surface of the copper foil, drying at 60 ℃ for 2h, then heating to 150 ℃, and drying in vacuum for 8h to obtain the prefabricated SEI film.
In addition, the viscous fluid liquid is injected into a porous mold, a prefabricated SEI film is prepared according to the same process, and the results of the relevant performance tests are shown in table 1 below.
Example 5
The composition comprises the following components in percentage by mass: 100g of N, N-dimethylformamide, 30g of acetonitrile, 50g of PVDF-HFP, 5.0g of PEO5, and lithium nitrate (LiNO)3)13.79g (0.2mol) and 5.0g of silicon carbide nano powder.
The preparation process of prefabricating the SEI film on the surface of the lithium metal negative electrode comprises the following steps of:
(1) PVDF-HFP (vinylidene fluoride-co-hexafluoropropylene) and PEO (polyethylene oxide) in the mass ratio are added and dissolved in methyl pyrrolidone, and the mixture is stirred at the temperature of 30 ℃ until the mixture is completely dissolved;
(2) dissolving lithium bis (oxalato) borate in acetonitrile according to the mass ratio, adding aluminum oxide nano powder in the mass ratio, and performing ultrasonic dispersion for 2 hours;
(3) mixing the solution obtained in the step (1) and the solution obtained in the step (2), and stirring for 1h until the viscosity is 3000cP to obtain viscous and fluid liquid;
(4) and (4) uniformly coating the viscous fluid liquid obtained in the step (3) on the surface of the copper foil, drying at 40 ℃ for 1h, heating to 100 ℃, and drying in vacuum for 6h to obtain the prefabricated SEI film.
In addition, the viscous fluid liquid is injected into a porous mold, a prefabricated SEI film is prepared according to the same process, and the results of the relevant performance tests are shown in table 1 below.
TABLE 1 viscous flow liquid-related Performance test results
Figure BDA0002555038990000061
In the comparative example, the positive electrode of the button cell is a pure copper foil without a prefabricated SEI film, and other conditions and preparation processes are the same. Cycle life refers to the number of cycles at which the cycle efficiency is greater than 80%. As can be seen from Table 1, the ion conductivity of the preformed SEI film is high, up to 10-3The level and the tensile strength are excellent, the maximum tensile strength can exceed 50MPa, the voltage window meets the requirement, and the maximum cycle efficiency is 99.9 percent. Therefore, the prefabricated SEI film solves the problems of safety and interface stability of the lithium metal negative electrode, and can promote industrialization of the lithium metal negative electrode.
The above embodiments are merely preferred embodiments of the present invention, and any simple modification, modification and substitution changes made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims (10)

1. A method for prefabricating an SEI film on the surface of a lithium metal negative electrode is characterized by comprising the following steps:
(1) PVDF-HFP and PEO in proportion and mass are added and dissolved in a first solvent, and stirring is carried out at 25-50 ℃ until the materials are completely dissolved;
(2) dissolving lithium salt in a second solvent according to a ratio by mass, adding an additive according to a ratio by mass, and performing ultrasonic dispersion for 2-4 hours;
(3) mixing the solution obtained in the step (1) and the solution obtained in the step (2), and stirring for 1-2 hours until the viscosity is 3000-6000 cP to obtain viscous liquid;
(4) and (4) uniformly coating the viscous fluid liquid obtained in the step (3) on the surface of the lithium battery negative current collector, and drying to obtain the prefabricated SEI film.
2. The method for prefabricating the SEI film on the surface of the lithium metal anode according to claim 1, wherein the mass of the first solvent is calculated as 100g, the mass of the second solvent is 30-60 g, the mass of PVDF-HFP is 15-30 g, the mass of the lithium salt is 0.05-0.2 mol, the mass of PEO is 0.5-10% of the mass of PVDF-HFP, and the mass of the additive is 0-10 g.
3. The method for prefabricating the SEI film on the surface of the lithium metal anode according to claim 1, wherein the first solvent is one or two of N, N-dimethylformamide and N-methylpyrrolidone.
4. The method for prefabricating the SEI film on the surface of the lithium metal anode according to claim 1, wherein the lithium salt is selected from one or more of lithium difluorophosphate, lithium bis (trifluoromethylsulfonyl) imide, lithium bis (oxalato) borate, lithium difluorooxalato borate and lithium nitrate.
5. The method for prefabricating the SEI film on the surface of the lithium metal anode according to claim 1, wherein the second solvent is one or two of acetonitrile and acetone.
6. The method for prefabricating the SEI film on the surface of the lithium metal anode according to claim 1, wherein the additive is selected from one of alumina nanopowder or nanowire, titanium oxide nanopowder or nanowire, boron oxide nanopowder or nanowire, silicon carbide nanopowder or nanowire, fumed silica and the like.
7. The method for prefabricating the SEI film on the surface of the lithium metal negative electrode according to claim 1, wherein the current collector of the lithium battery negative electrode is selected from copper foil or lithium foil.
8. The method for prefabricating the SEI film on the surface of the lithium metal anode according to claim 1, wherein the drying conditions are as follows: drying at 40-60 ℃ for 1-2 h, then heating to 100-150 ℃, and vacuum drying for 6-12 h.
9. The lithium metal negative electrode prepared by the method for prefabricating the SEI film on the surface of the lithium metal negative electrode according to any one of claims 1 to 8.
10. A lithium ion battery comprising the lithium metal negative electrode according to claim 9.
CN202010587007.3A 2020-06-24 2020-06-24 Method for prefabricating SEI film on surface of metal lithium cathode Pending CN111599990A (en)

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CN113193174A (en) * 2021-04-28 2021-07-30 昆山宝创新能源科技有限公司 Interface pretreatment liquid for silica prelithiation negative electrode and preparation method and application thereof
CN114744158A (en) * 2022-05-18 2022-07-12 中南大学 Method for applying organic/inorganic composite coating to surface modification of lithium metal electrode
WO2024011541A1 (en) * 2022-07-14 2024-01-18 宁德时代新能源科技股份有限公司 Secondary battery, battery module, battery pack, and electrical device

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Publication number Priority date Publication date Assignee Title
CN113193174A (en) * 2021-04-28 2021-07-30 昆山宝创新能源科技有限公司 Interface pretreatment liquid for silica prelithiation negative electrode and preparation method and application thereof
CN114744158A (en) * 2022-05-18 2022-07-12 中南大学 Method for applying organic/inorganic composite coating to surface modification of lithium metal electrode
CN114744158B (en) * 2022-05-18 2024-05-03 中南大学 Method for modifying surface of lithium metal electrode by using organic/inorganic composite coating
WO2024011541A1 (en) * 2022-07-14 2024-01-18 宁德时代新能源科技股份有限公司 Secondary battery, battery module, battery pack, and electrical device

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Application publication date: 20200828