CN107528038A - Prepare the mixed slurry of composite diaphragm and the preparation method of composite diaphragm - Google Patents
Prepare the mixed slurry of composite diaphragm and the preparation method of composite diaphragm Download PDFInfo
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- CN107528038A CN107528038A CN201710766397.9A CN201710766397A CN107528038A CN 107528038 A CN107528038 A CN 107528038A CN 201710766397 A CN201710766397 A CN 201710766397A CN 107528038 A CN107528038 A CN 107528038A
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/44—Fibrous material
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/431—Inorganic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
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- 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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Abstract
The invention discloses a kind of mixed slurry for preparing composite diaphragm, by mass percentage including nanometre glue, 5% 45%；Palygorskite nano ceramic fibre, 5% 45%；Binding agent, 1.5% 5%；Dispersant, 0.5% 1.5%；Surfactant, 0.1% 0.5%, solvent, surplus.The invention also discloses a kind of preparation method of composite diaphragm.
Description
Technical field
The present invention relates to fields such as lithium batteries, specially a kind of system for the mixed slurry and composite diaphragm for preparing composite diaphragm
Preparation Method.
Background technology
The advantages that lithium ion battery is due to its high-energy-density and longer cycle life is just as novel power supply technology
Study hotspot.Lithium ion battery has been widely used for the various fields such as digital electronic goods, new-energy automobile, is by internationally recognized
The novel energy carrier of great application prospect and market value.In recent years, China is just greatly developing lithium ion battery industry, lithium from
The production capacity of sub- battery is continuously increased, but thing followed lithium ion battery security problem is also more and more of interest by people.
The composition of lithium ion battery includes positive pole, negative pole, barrier film and electrolyte, and barrier film is as the barrier between both positive and negative polarity
Vital effect is played to the performance of lithium ion battery, its performance directly influences the capacity and cycle life of battery, special
It is not the security performance of battery.The TPOs such as monolayer polyethylene (PE), single-layer polypropylene (PP), PP/PE/PP three-layer membranes every
Film easily shrinks or perforated in the case of high current intensity, high temperature or lithium dendrite growth, positive and negative extremely short so as to occur
Road.Such barrier film can not meet application demand at present.Coated ceramic stratum granulosum or attapulgite are received on the base materials such as polyolefin
The method that composite diaphragm is made in rice ceramic fibre is widely adopted.Ceramic particle is coated on polyene by patent CN105514328A
Hydro carbons membrane surface, using the inorganic particles of membrane surface, strengthen the mechanical performances such as the being folded without breaking of barrier film and heat endurance, carry
The security performance of high battery.But the ceramic particle of subglobular is easy to the duct blocked in former polyalkene diaphragm, so as to hinder
Broken ion conduction channel so that the capacity and cycle life of battery have significantly sacrificing.Patent ZL201410746094.7 will
Palygorskite nano ceramic fibre club-shaped material is coated on TPO membrane surface, improves the heat endurance and ion of barrier film
Conducting power.But the cohesive force between fiber club-shaped material and polyolefine material is poor, and palygorskite nano ceramic fibre
Cohesive force between barrier film and electrodes of lithium-ion batteries is very low, is unfavorable for the processing and transport of battery.
In order to meet lithium ion battery to the ever-increasing demand of High-performance diaphragm, developing has higher Stability Analysis of Structures
Property, good ionic conduction power, excellent electrolyte imbibition, protect the performance such as stronger cohesive force between fluidity and barrier film and pole piece every
Film, which seems, to be highly desirable.
The content of the invention
The purpose of the present invention is：A kind of mixed slurry for preparing composite diaphragm is provided, to improve barrier film mechanical performance and heat
Shrinkage, while composite diaphragm is possessed excellent electrolyte imbibition and liquid-keeping property, and improve composite diaphragm and lithium electricity
Cohesive force between the pole piece of pond.
Realizing the technical scheme of above-mentioned purpose is：A kind of mixed slurry for preparing composite diaphragm, includes by mass percentage
Nanometre glue, 5%-45%；Palygorskite nano ceramic fibre, 5%-45%；Binding agent, 1.5%-5%；Dispersant, 0.5%-
1.5%；Surfactant, 0.1%-0.5%, solvent, surplus.
In a preferred embodiment of the invention, the nanometre glue is sphere structure, and diameter is at 100 nanometers to 150 nanometers；
Wherein, the nanometre glue is the one or more in Kynoar, polytetrafluoroethylene (PTFE), vinylidene and hexafluoropropylene copolymer
Combination.
In a preferred embodiment of the invention, the average length of the palygorskite nano ceramic fibre is at 0.5 micron
To 2 microns, average diameter is at 0.05 micron to 0.3 micron.
In a preferred embodiment of the invention, the binding agent is polyacrylate, polyvinyl alcohol, ethyl vinyl acetate
It is one or more of mixed in ethylene copolymer, polyvinyl acetate, butadiene-styrene latex, styrene-acrylic latex, purified petroleum benzin latex or polyurethane
Compound.
In a preferred embodiment of the invention, the dispersant is water-soluble highly branched chain alcohol, sodium carboxymethylcellulose, phosphorus
One or more in triethylenetetraminehexaacetic acid ester, polyacrylic acid, Sodium Polyacrylate, polyethylene glycol, PEO and hydroxyethyl cellulose
Combination.
In a preferred embodiment of the invention, the surfactant is fluoro-alkyl methoxyl group ether alcohol, fluoro-alkyl
One or more of mixtures in ethyoxyl ether alcohol, polyoxyethylene alkylamide, AEO.
The second object of the present invention is：A kind of preparation method of composite diaphragm is provided.
Realizing the technical scheme of above-mentioned purpose is：A kind of preparation method of composite diaphragm, comprises the following steps：Step S1)
Prepare the mixed slurry any one of claim 1-6；Step S2) mixed slurry is coated on apertured polymeric film
Surface, form the membrane layer of nanometre glue and palygorskite nano ceramic fibre；Step S3) drying, obtain the composite diaphragm.
In a preferred embodiment of the invention, the step S1) comprise the following steps：Step S11) by the concave convex rod
Stone nano ceramic fibers are dissolved in solvent with dispersant, and are sufficiently stirred；Step S12) to step S11) in solution in
Nanometre glue, binding agent and surfactant are added, by being sufficiently mixed stirring, the mixed slurry is made.
In a preferred embodiment of the invention, the apertured polymeric film is polyethylene based film, polypropylene basement membrane, poly- third
Alkene/polyethylene/polypropylene compound substrate membranes, polyimide base film, nanometre glue basement membrane, polyethylene nonwoven basement membrane, polypropylene non-woven
One kind in cloth basement membrane or polyimide nonwoven fabric basement membrane.
In an of the invention preferred embodiment, nanometre glue in the membrane layer and palygorskite nano ceramic fibre without
Rule stacks arrangement, and forms hole of the average pore size at 0.05 micron to 1 micron.
It is an advantage of the invention that：The present invention's prepares the mixed slurry of composite diaphragm and the preparation method of composite diaphragm, this
Invention passes through coating process, composite diaphragm is prepared, due to the palygorskite nano of dispersed stacking in composite diaphragm be present
Ceramic fibre so that the in-plane tensile strength of barrier film is got a promotion, and barrier film mechanical performance is improved with heat endurance, is enhanced
The security of battery.Due to the presence of nanometre glue, the caking property enhancing of barrier film and battery pole piece so that the increase of pole piece hardness, electricity
Pond is more solid, convenient processing and transport.Nanometre glue is mixed into coating with palygorskite nano ceramic fibre, improves attapulgite
Adhesive force of the nano ceramic fibers on apertured polymeric film, reduce Ceramic Composite barrier film ceramics during transport, use
The risk that powder comes off.Coating stripping intensity, the tensile strength of obtained composite diaphragm, which have, to be obviously improved, its mechanical performance
There is higher improvement with thermal contraction performance, and improve the cohesive force between composite diaphragm and lithium battery pole slice.Pass through simultaneously
Voidage also makes composite diaphragm possess excellent electrolyte imbibition and liquid-keeping property.
Brief description of the drawings
The present invention is further explained with reference to the accompanying drawings and examples.
Fig. 1 is the composite diaphragm sample S3 of the embodiment of the present invention 3 surface Scanning Electron microscope photograph.
Embodiment
The explanation of following examples is with reference to additional schema, to illustrate the particular implementation that the present invention can be used to implementation
Example.
A kind of mixed slurry for preparing composite diaphragm, by mass percentage including nanometre glue, 5%-45%；Attapulgite is received
Rice ceramic fibre, 5%-45%；Binding agent, 1.5%-5%；Dispersant, 0.5%-1.5%；Surfactant, 0.1%-
0.5%, solvent, surplus.
The nanometre glue is sphere structure, and diameter is at 100 nanometers to 150 nanometers；Wherein, the nanometre glue is polyvinylidene fluoride
One or more combinations in alkene, polytetrafluoroethylene (PTFE), vinylidene and hexafluoropropylene copolymer.In specific dispensing, lead to
The mass fraction of normal nanometre glue is 10% or so.
The average length of the palygorskite nano ceramic fibre is at 0.5 micron to 2 microns, and average diameter is at 0.05 micron
To 0.3 micron.In specific dispensing, the mass fraction of usual palygorskite nano ceramic fibre is 20% or so.
The binding agent is polyacrylate, polyvinyl alcohol, ethylene-vinyl acetate copolymer, polyvinyl acetate, fourth
One or more of mixtures in Atrolactamide, styrene-acrylic latex, purified petroleum benzin latex or polyurethane.It is generally viscous in specific dispensing
The mass fraction of agent is tied 3% or so.
The dispersant is water-soluble highly branched chain alcohol, sodium carboxymethylcellulose, triethyl phosphate, polyacrylic acid, polypropylene
One or more combinations in sour sodium, polyethylene glycol, PEO and hydroxyethyl cellulose.In specific dispensing, lead to
The mass fraction of normal dispersant is 1% or so.
The surfactant is fluoro-alkyl methoxyl group ether alcohol, fluoro-alkyl ethyoxyl ether alcohol, polyxyethylated acyl
One or more of mixtures in amine, AEO.In specific dispensing, the mass fraction of usual binding agent
0.3% or so.
The solvent generally selects deionized water, and deionized water is pollution-free, is advantageous to environmental protection.
A kind of preparation method of composite diaphragm, comprises the following steps：Step S1) prepare the mixed slurry；The step
S1) comprise the following steps：Step S11) the palygorskite nano ceramic fibre and dispersant are dissolved in solvent, and filled
Divide stirring；Step S12) to step S11) in solution in add nanometre glue, binding agent and surfactant, by being sufficiently mixed
Stirring, is made the mixed slurry.
Step S2) mixed slurry is coated on apertured polymeric film surface, form nanometre glue and palygorskite nano
The membrane layer of ceramic fibre.In the present invention, can apertured polymeric film double spread, can also be in apertured polymeric film
One side coating.The apertured polymeric film is polyethylene based film, polypropylene basement membrane, polypropylene, polyethylene/polypropylene composite materials base
Film, polyimide base film, nanometre glue basement membrane, polyethylene nonwoven basement membrane, polypropylene non-woven fabric basement membrane or polyimide nonwoven fabric
One kind in basement membrane.Step S3) drying, obtain the composite diaphragm.Nanometre glue in the membrane layer is made pottery with palygorskite nano
Porcelain fiber is random to stack arrangement, and forms hole of the average pore size at 0.05 micron to 0.5 micron, the thickness of the membrane layer
Scope is 9 microns to 20 microns.
The preparation method of composite diaphragm in the present invention is explained with reference to specific embodiment.
Embodiment 1, the present embodiment are the preparation methods of common barrier film, alumina particle barrier film.
By 20g alumina particles, 0.6g sodium carboxymethylcelluloses and 40g deionized waters in high speed dispersor with 3000 turns
Rotating speed per minute stirs 1 hour.0.5g fluoro-alkyl methoxyl groups ether alcohol, 0.4g sodium carboxymethylcelluloses, 3g is added again to gather
Acrylate and 16g deionized waters, 3h is stirred under 2000 rpms of rotating speed.Gained slurry is existed with micro- gravure coater
One side coating is carried out on 12 microns of thick polyethylene films, answering for the alumina particle that gross thickness is 16 microns is obtained after 60 DEG C of drying
Barrier film is closed, labeled as S1.
Embodiment 2, the present embodiment are the preparation methods of nanometre glue and alumina particle composite diaphragm.
By 20g alumina particles, 0.6g sodium carboxymethylcelluloses and 40g deionized waters in high speed dispersor with 3000 turns
Rotating speed per minute stirs 1 hour.10g nanometre glues emulsion, 0.5g fluoro-alkyl methoxyl groups ether alcohol, 0.4g carboxymethyls are added again
Sodium cellulosate, 3g polyacrylate and 16g deionized waters, 3h is stirred under 2000 rpms of rotating speed.Gained slurry is used
Micro- gravure coater carries out one side coating on 12 microns of thick polyethylene films, and it is 16 microns that gross thickness is obtained after 60 DEG C of drying
The composite diaphragm of nanometre glue and alumina particle, labeled as S2..
Embodiment 3, the present embodiment are the preparation methods of the composite diaphragm of the present invention.
Step S11) 20g palygorskite nano ceramic fibres powder, 0.6g sodium carboxymethylcelluloses and 30g deionized waters are existed
Stirred 1 hour with 3000 rpms of rotating speed in high speed dispersor.
Step S12) 10g nanometre glues emulsion, 0.5g fluoro-alkyl methoxyl groups ether alcohol, 0.4g carboxymethyl celluloses are added again
Sodium, 3.5g polyvinyl acetate and 10g deionized waters, stir 3h under 2000 rpms of rotating speed, obtain mixed slurry.
Step S2) gained mixed slurry on 12 microns of thick polyethylene films is subjected to two-sided painting with micro- gravure coater
Cloth, form membrane layer.
Step S3) under the conditions of temperature is 60 DEG C, drying, obtain the nanometre glue that gross thickness is 16 microns and received with attapulgite
The composite diaphragm of rice ceramic fibre, labeled as S3.
Performance test is carried out to the composite diaphragm of embodiment 1 to embodiment 3 below, test result is as shown in table 1 below.
Table 1：Composite diaphragm sample S1, S2, S3 properties test result.
From table 1 it follows that the composite diaphragm of the present embodiment 3 is after being assembled into battery core and fluid injection hot pressing, barrier film/pole piece
Between peel strength highest, and thermal contraction performance is better than the composite diaphragm of embodiment 1 and embodiment 2.Coating stripping intensity, barrier film resist
Tensile strength is also obviously improved.Therefore, it can be said that bright, its mechanical performance of composite diaphragm obtained by this method and thermal contraction
Performance has higher improvement, and improves the cohesive force between composite diaphragm and lithium battery pole slice.Pass through voidage simultaneously
Composite diaphragm is set to possess excellent electrolyte imbibition and liquid-keeping property.
These are only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
All any modification, equivalent and improvement made within principle etc., should be included in the scope of the protection.
Claims (10)
1. a kind of mixed slurry for preparing composite diaphragm, it is characterised in that include by mass percentage
2. the mixed slurry according to claim 1 for preparing composite diaphragm, it is characterised in that the nanometre glue is spheroid knot
Structure, diameter is at 100 nanometers to 150 nanometers；Wherein, the nanometre glue is Kynoar, polytetrafluoroethylene (PTFE), vinylidene and six
One or more combinations in fluoropropene copolymer.
3. the mixed slurry according to claim 1 for preparing composite diaphragm, it is characterised in that the palygorskite nano pottery
The average length of porcelain fiber is at 0.5 micron to 2 microns, and average diameter is at 0.05 micron to 0.3 micron.
4. the mixed slurry according to claim 1 for preparing composite diaphragm, it is characterised in that the binding agent is polypropylene
Esters of gallic acid, polyvinyl alcohol, ethylene-vinyl acetate copolymer, polyvinyl acetate, butadiene-styrene latex, styrene-acrylic latex, purified petroleum benzin latex,
Or one or more of mixtures in polyurethane.
5. the mixed slurry according to claim 1 for preparing composite diaphragm, it is characterised in that the dispersant is water solubility
Highly branched chain alcohol, sodium carboxymethylcellulose, triethyl phosphate, polyacrylic acid, Sodium Polyacrylate, polyethylene glycol, PEO and
One or more combinations in hydroxyethyl cellulose.
6. the mixed slurry according to claim 1 for preparing composite diaphragm, it is characterised in that the surfactant is fluorine
One kind in substituted alkyl methoxyl group ether alcohol, fluoro-alkyl ethyoxyl ether alcohol, polyoxyethylene alkylamide, AEO
Or several mixture.
7. a kind of preparation method of composite diaphragm, it is characterised in that comprise the following steps：
Step S1) prepare mixed slurry any one of claim 1-6；
Step S2) mixed slurry is coated on apertured polymeric film surface, form nanometre glue and palygorskite nano ceramics
The membrane layer of fiber；
Step S3) drying, obtain the composite diaphragm.
8. the preparation method of composite diaphragm according to claim 7, it is characterised in that comprise the following steps：
The step S1) comprise the following steps：
Step S11) the palygorskite nano ceramic fibre and dispersant are dissolved in solvent, and be sufficiently stirred；
Step S12) to step S11) in solution in add nanometre glue, binding agent and surfactant, stirred by being sufficiently mixed
Mix, the mixed slurry is made.
9. the preparation method of composite diaphragm according to claim 7, it is characterised in that the apertured polymeric film is poly- second
Alkenyl film, polypropylene basement membrane, polypropylene, polyethylene/polypropylene composite materials basement membrane, polyimide base film, nanometre glue basement membrane, polyethylene
One kind in non-woven fabrics basement membrane, polypropylene non-woven fabric basement membrane or polyimide nonwoven fabric basement membrane.
10. the preparation method of composite diaphragm according to claim 7, it is characterised in that the nanometre glue in the membrane layer
Arranged with random stack of palygorskite nano ceramic fibre, and form hole of the average pore size at 0.05 micron to 0.5 micron.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108854577A (en) * | 2018-09-14 | 2018-11-23 | 天津工业大学 | A kind of preparation method of the tubular membrane of PI non-woven cloth support tube |
| CN108963163A (en) * | 2018-08-01 | 2018-12-07 | 河北金力新能源科技股份有限公司 | A kind of oiliness PVDF slurry, its preparation process and its coating method |
| CN109148794A (en) * | 2018-08-30 | 2019-01-04 | 上海力信能源科技有限责任公司 | A kind of diaphragm oiliness ceramic slurry and preparation method thereof, diaphragm |
| CN109167005A (en) * | 2018-08-31 | 2019-01-08 | 深圳市星源材质科技股份有限公司 | Composite diaphragm and preparation method thereof |
| CN109167013A (en) * | 2018-08-31 | 2019-01-08 | 深圳市星源材质科技股份有限公司 | Coating fluid, lithium ion battery separator and lithium ion battery for lithium ion battery |
| CN109192910A (en) * | 2018-09-11 | 2019-01-11 | 江苏清陶能源科技有限公司 | A kind of oiliness coating and nano ceramic fibers composite diaphragm and preparation method thereof |
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| CN108963163B (en) * | 2018-08-01 | 2021-08-10 | 河北金力新能源科技股份有限公司 | Oily PVDF slurry, preparation process and coating method thereof |
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| CN109167013A (en) * | 2018-08-31 | 2019-01-08 | 深圳市星源材质科技股份有限公司 | Coating fluid, lithium ion battery separator and lithium ion battery for lithium ion battery |
| CN109192910A (en) * | 2018-09-11 | 2019-01-11 | 江苏清陶能源科技有限公司 | A kind of oiliness coating and nano ceramic fibers composite diaphragm and preparation method thereof |
| CN108854577A (en) * | 2018-09-14 | 2018-11-23 | 天津工业大学 | A kind of preparation method of the tubular membrane of PI non-woven cloth support tube |
| CN110724415A (en) * | 2019-09-02 | 2020-01-24 | 深圳市劢全新材料科技有限责任公司 | Composition, preparation method and application of composition in battery diaphragm coating material |
| JP2022540696A (en) * | 2019-09-11 | 2022-09-16 | エルジー エナジー ソリューション リミテッド | Separation membrane for secondary batteries with excellent electrolyte impregnation |
| JP7483299B2 (en) | 2019-09-11 | 2024-05-15 | エルジー エナジー ソリューション リミテッド | Separator for secondary batteries with excellent electrolyte impregnation |
| US12255349B2 (en) | 2019-09-11 | 2025-03-18 | Lg Energy Solution, Ltd. | Separator for secondary battery having excellent electrolyte impregnation |
| CN113410574A (en) * | 2020-11-19 | 2021-09-17 | 华东理工大学 | Polyvinyl alcohol-attapulgite composite nanofiber membrane and preparation method thereof |
| CN114784451A (en) * | 2022-04-27 | 2022-07-22 | 湖南烁普新材料有限公司 | Lithium ion battery separator slurry and preparation method thereof, and lithium ion battery composite separator |
| CN114784451B (en) * | 2022-04-27 | 2024-12-17 | 湖南烁普新材料有限公司 | Lithium ion battery diaphragm slurry, preparation method thereof and lithium ion battery composite diaphragm |
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