CN111254745A - Super capacitor paper and preparation method and application thereof - Google Patents
Super capacitor paper and preparation method and application thereof Download PDFInfo
- Publication number
- CN111254745A CN111254745A CN202010055067.0A CN202010055067A CN111254745A CN 111254745 A CN111254745 A CN 111254745A CN 202010055067 A CN202010055067 A CN 202010055067A CN 111254745 A CN111254745 A CN 111254745A
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- paper
- fibers
- supercapacitor
- pet
- tencel
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- 239000003990 capacitor Substances 0.000 title description 66
- 238000002360 preparation method Methods 0.000 title description 4
- 239000000835 fiber Substances 0.000 claims abstract description 60
- 229920000433 Lyocell Polymers 0.000 claims abstract description 37
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims description 5
- 238000011160 research Methods 0.000 claims description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 claims 8
- 239000005020 polyethylene terephthalate Substances 0.000 claims 8
- -1 polyethylene terephthalate Polymers 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 3
- 230000002411 adverse Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 11
- 238000011002 quantification Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000010009 beating Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/02—Synthetic cellulose fibres
- D21H13/08—Synthetic cellulose fibres from regenerated cellulose
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/24—Polyesters
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/18—Reinforcing agents
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/52—Separators
-
- 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
- Y02E60/13—Energy storage using capacitors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Paper (AREA)
Abstract
The invention provides a piece of supercapacitor paper, which comprises, by weight, 5-30% of PET fibers, 70-95% of tencel fibers and the balance of a dry strength agent, wherein the dry strength agent accounts for 0.3-1% of the total weight of the PET fibers and the tencel fibers, the weight ratio of PET fiber pulp is 5-30%, if the weight ratio is higher than 30%, the tensile strength of paper sheets is low and cannot meet the processing requirement of a supercapacitor, and when the weight ratio is lower than 5%, the tearing degree of the paper sheets is low, the elongation rate is low, the strength requirement in the assembling process of the supercapacitor is difficult to meet, the loss is also adversely affected, and part of fine-denier PET fibers can improve the loss performance of the supercapacitor.
Description
Technical Field
The invention relates to a piece of paper for a super capacitor, in particular to a piece of isolation paper for a long-life super capacitor.
Background
Electrolytic capacitors are one of the most important basic electronic components in electronic engineering. It has special functions in electronic circuits, such as correction circuit, power supply circuit and starting circuit of AC motor, besides the functions of filtering, coupling and by-passing. The method is widely applied to the fields of military industry, civil communication equipment, audio-visual systems, control electrical appliances, electronic instruments and the like. The electrolytic capacitor paper is a lining material for adsorbing electrolyte in the electrolytic capacitor, and the performance of the electrolytic capacitor paper directly influences the quality of the electrolytic capacitor.
With the rapid development of electronic technology, electrolytic capacitors are rapidly developed toward miniaturization, high quality, high reliability and long life. Correspondingly, higher requirements are put on the electrolytic capacitor paper, and the development of new high-grade electrolytic capacitors is often dependent on the development of new electrolytic capacitor paper. A super electrolytic capacitor (Supercapacitor) is a novel power electronic component which has emerged along with breakthrough of material science in recent years. The capacitor fills the gap of specific energy and specific power between a common capacitor and a battery, has capacitance as high as thousands of farads, and has instantaneous discharge current as high as thousands of amperes. The super capacitor has huge application value and market potential in the aspects of automobiles (particularly electric automobiles, mixed fuel automobiles and special load-carrying vehicles), electric power, railways, communication, national defense industry (particularly missile launching and communication), consumer electronics and the like, and is widely concerned by countries all over the world. The cycle life of the super capacitor is long, the cycle life is generally in the order of millions, the cycle life of a portable lithium battery commonly used by people is below thousands of times, and the super capacitor has invincible cycle life, so that the super capacitor is often made into maintenance-free products in the civil market. Because of its ultra-high capacity, the super-electrolytic capacitor is used in military equipment in many developed countries, such as the united states, where it is first used in heavy trucks, armored troops and tanks, ensuring fast and safe start of the vehicles at low temperatures. And the paper of the super capacitor is one of the core raw materials of the super electrolytic capacitor.
CN108221487A discloses a super electrolytic capacitor paper with low internal resistance and a preparation method thereof, wherein used fiber raw materials are tencel and superfine chemical fiber, the loss of the product is greatly reduced due to the use of part of the superfine chemical fiber, and the leakage current is not influenced. The method is also an important reason that the national ultra-capacity diaphragm is occupied by imported products at present.
Disclosure of Invention
In view of the above technical problems, an object of the present invention is to provide a paper for a super capacitor, which has high strength, small and uniform pore diameter, and high porosity, and when the paper for a super capacitor is applied to a super capacitor, the paper for a super capacitor is suitable for processing the super capacitor due to its high strength; secondly, the leakage amount of the super capacitor is small due to the small and uniform aperture, so that the super capacitor is suitable for storing energy; and finally, the porosity is high, so that a large amount of ions can pass through the super capacitor in a short time, and the high-power density performance of the super capacitor is reflected.
In order to achieve the purpose, the invention adopts the following technical scheme:
the super capacitor paper is composed of, by weight, 5-30% of PET fibers, 70-95% of tencel fibers and the balance of a dry strength agent, wherein the dry strength agent accounts for 0.3-1% of the total weight of the PET fibers and the tencel fibers, and comprises:
the thickness of the PET fiber is between 0.2 and 1.0 denier, and the length is between 2 and 6 mm;
the lyocell fibers can have a freeness between 87-96 ° SR.
The weight ratio of the PET fiber pulp is 5-30%, if the weight ratio is higher than 30%, the tensile strength of the paper sheet is low, the processing requirement of the super capacitor cannot be met, and if the weight ratio is lower than 5%, the tearing strength of the paper sheet is low, the elongation is low, the strength requirement in the assembling process of the super capacitor cannot be met, the loss is also adversely affected, and part of fine denier PET fibers can improve the loss performance of the super capacitor.
The positive electrode material of the super capacitor is a finely ground activated carbon material, the minimum particle size of the material is only 2 mu m, namely the maximum pore diameter of paper used as a separation material is below 2 mu m, so that carbon particles are prevented from passing through, electric leakage is caused after reaching the negative electrode, and large carbon particles are short-circuited after passing through; so the requirements for paper are small maximum pore size and high porosity; the PET fiber is a synthetic fiber raw material with smaller thickness which can be industrially produced at present; adding part of PET fibers, under the condition that the maximum aperture is not more than 2 mu m, the elongation of finished paper can be improved, and the method is used for ensuring that the processing is not influenced by paper breakage in the winding process of the super capacitor; the tencel fiber is a novel environment-friendly viscose fiber, and does not discharge alkali liquor in the production process and cause pollution to the environment. The biggest advantage of the tencel in the paper making is that the tencel can be devillished to brook, and the tiny fiber which is divided is round, which is greatly different from the flat filament of the plant fiber, the low-tightness paper made of the fiber material is very suitable, and the aperture of the paper sheet which is made is small because the divided filament is very thin and the smallest filament is 100nm, which meets the requirement of the super capacitor on the isolation material.
The pulp degree of the tencel fiber has an important influence on both the strength and the aperture of the paper of the supercapacitor, when the pulp degree of the tencel fiber is higher, the strength of the paper sheet is high, and at the moment, the fiber is fully divided, the aperture of the paper is small, the corresponding leakage current is smaller, and the tencel fiber is suitable for energy storage; when the size of the lyocell fiber is low, the loss is low, however, it causes defects of decreasing the strength of the paper and increasing leakage current.
The invention further improves the tensile strength of the paper surface by adding a papermaking dry strength agent to meet the requirement on the strength during the processing of the super capacitor, and the paper sheet can be a single layer or a plurality of layers.
Preferably, the thickness of the PET fiber is 0.5-0.8 denier, and the length is 3-5 mm; the pulp degree of the tencel fiber is 88-94 DEG SR.
Preferably, the dry strength agent is provided by Hangzhou chemical research institute, and is of a low-chlorine type HM 2800; the applicant avoids introducing excessive chlorine while improving the strength of the paper by introducing the low-chlorine type HM2800 dry strength agent, so that the finally obtained paper can meet the purity requirement of electrolysis.
Preferably, the weight ratio of the PET fibers to the tencel fibers is 90:10, and the added weight of the dry strength agent accounts for 0.3-0.5 of the total weight of the PET fibers and the tencel fibers.
Preferably, the lyocell fibers can have a pulp size of 92 to 96 ° SR.
The invention also aims to provide a preparation method of the supercapacitor paper, which specifically comprises the following steps: and papermaking with a former by using tencel fibers, PET fibers and a dry strength agent. In some embodiments of the invention, the former includes, but is not limited to, cylinder, fourdrinier, inclined wire and wire machines; fourdrinier machine papermaking is preferred.
Still another object of the present invention is to apply the above-described supercapacitor paper to a supercapacitor; in some embodiments of the invention, the supercapacitor paper is a single layer; in other embodiments of the present invention, the supercapacitor paper is multi-layered;
since the thickness of the paper sheet is determined by the volume of the supercapacitor, in some embodiments of the invention, the thickness of the supercapacitor paper sheet ranges from 30 to 60 μm, and the tightness of the paper is between 0.40 and 0.50g/cm due to the balance between the strength and the porosity of the paper3。
Detailed Description
The present invention is further illustrated by the following examples. The present invention is not limited to the specific embodiments;
the following dry strength agents are provided by Hangzhou chemical research institute, and the model is modified from HDS-3.
In reference example 1, indexes such as leakage current, internal resistance and capacity of the test capacitor of the super capacitor are made according to conventional indexes such as 88 DEG SR of the degree of beating of tencel fiber, papermaking of a cylinder paper machine, paper sheet detection quantification, strength and the like.
In reference example 2, the indexes of leakage current, internal resistance, capacity and the like of the test capacitor of the super capacitor are made according to conventional indexes of 88 DEG SR of the beating degree of tencel fiber, papermaking of a fourdrinier machine, paper detection quantification, strength and the like.
Reference example 3, degree of slashing SR of tencel fiber 88 °, 0.3 denier 4mm PET fiber, weight ratio 90: and 10, making paper by a cylinder paper machine, detecting paper pages, quantifying, detecting strength and other conventional indexes, and making the indexes such as leakage current, internal resistance, capacity and the like of the test capacitor of the super capacitor.
Reference example 4, degree of slashing SR of tencel fiber 88 °, 0.3 denier 3mm PET fiber, weight ratio 90: and 10, making paper by a fourdrinier machine, detecting paper pages, detecting quantification, detecting strength and other conventional indexes, and making the indexes such as leakage current, internal resistance, capacity and the like of the test capacitor of the super capacitor.
Example 1, tencel fiber freeness 92 ° SR, 0.7 denier 4mm PET, weight ratio 95: and 5, adding 0.4% of dry strength agent, papermaking by a fourdrinier machine, detecting and quantifying paper sheets, detecting strength and other conventional indexes to prepare indexes such as leakage current, internal resistance, capacity and the like of the test capacitor of the super capacitor.
Example 2, tencel fiber freeness 92 ° SR, 0.7 denier 4mm PET, weight ratio 70: 30, adding 0.4% of dry strength agent, papermaking by a fourdrinier machine, detecting and quantifying paper sheets, detecting strength and other conventional indexes to prepare indexes such as leakage current, internal resistance, capacity and the like of the test capacitor of the super capacitor.
Example 3, tencel fiber freeness 96 ° SR, 0.3 denier 4mm PET, weight ratio 90: and 10, adding 0.3% of dry strength agent, papermaking by a fourdrinier machine, detecting and quantifying paper sheets, detecting strength and other conventional indexes to prepare indexes such as leakage current, internal resistance, capacity and the like of the test capacitor of the super capacitor.
Example 4, lyocell fibre freeness 90 ° SR, 0.7 denier 4mm PET, weight ratio 90:10, 0.4 percent of dry strength agent, conventional indexes such as papermaking of a fourdrinier machine, paper detection quantification, strength and the like, and the indexes such as leakage current, internal resistance, capacity and the like of the test capacitor of the super capacitor are made.
Example 5, tencel fiber freeness 92 ° SR, 0.2 denier 4mm PET, weight ratio 90:10, 1.0 percent of dry strength agent, conventional indexes such as papermaking of a fourdrinier machine, paper detection quantification, strength and the like, and the indexes such as leakage current, internal resistance, capacity and the like of the test capacitor of the super capacitor are made.
Example 6, tencel fiber freeness 92 ° SR, 0.2 denier 4mm PET, weight ratio 90:10, 0.5 percent of dry strength agent, conventional indexes such as papermaking of a fourdrinier machine, paper detection quantification, strength and the like, and the indexes such as leakage current, internal resistance, capacity and the like of the test capacitor of the super capacitor are made.
Example 7, lyocell fiber freeness 94 ° SR, 0.7 denier 4mm PET, weight ratio 88: 12, 0.1 percent of dry strength agent, conventional indexes such as papermaking of a fourdrinier machine, paper detection quantification, strength and the like, and the indexes such as leakage current, internal resistance, capacity and the like of the test capacitor of the super capacitor are made.
The data for each example are tabulated below:
and PS, the initial voltage is 2.70V, the pressure maintaining value is that after charging is finished, the capacitor is placed at normal temperature for 24 hours, and the voltage values at two ends of the capacitor are detected again, so that the PS can be used as an investigation index of capacitor leakage, and is particularly important for intelligent three-meter applications.
Claims (8)
1. The supercapacitor paper is characterized by comprising 5-30 wt% of PET (polyethylene terephthalate) fibers, 70-95 wt% of tencel fibers and the balance of a dry strength agent, wherein the dry strength agent accounts for 0.3-1 wt% of the total weight of the PET fibers and the tencel fibers, and
the thickness of the PET fiber is between 0.2 and 1.0 denier, and the length is between 2 and 6 mm;
the pulp degree of the tencel fiber can be 87-960SR.
2. The supercapacitor paper according to claim 1, wherein the PET fibers have a thickness of 0.5 to 0.8 denier and a length of 3 to 5 mm; tencel fiberThe pulp size of the fiber is 88-940SR。
3. The supercapacitor paper according to claim 1, wherein the dry strength agent is provided by the Hangzhou chemical research institute and is modified from HDS-3.
4. The supercapacitor paper according to claim 1, wherein the weight ratio of the PET fibers to the tencel fibers is 90:10, and the weight of the dry strength agent is 0.3-0.5 of the total weight of the PET fibers and the tencel fibers.
5. The supercapacitor paper of claim 1, wherein the lyocell fibers have a pulp size of 92-960SR。
6. The method for preparing the supercapacitor paper according to any one of claims 1 to 5, comprising the steps of: and papermaking with a former by using tencel fibers, PET fibers and a dry strength agent.
7. Use of the supercapacitor paper according to any one of claims 1 to 5 in a supercapacitor.
8. The use of claim 7, wherein the supercapacitor paper has one or more layers.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911267651 | 2019-12-11 | ||
| CN2019112676516 | 2019-12-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111254745A true CN111254745A (en) | 2020-06-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202010055067.0A Pending CN111254745A (en) | 2019-12-11 | 2020-01-17 | Super capacitor paper and preparation method and application thereof |
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| Country | Link |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522514A (en) * | 2011-12-21 | 2012-06-27 | 莱州联友金浩新型材料有限公司 | High-temperature resistant micropore thin film material and application thereof |
| CN106537537A (en) * | 2014-07-18 | 2017-03-22 | 日本高度纸工业株式会社 | Separator for power storage device, and power storage device using same |
| CN108028132A (en) * | 2015-09-17 | 2018-05-11 | 日本高度纸工业株式会社 | Electro chemical elements use separator and electrochemical element |
| WO2018208517A1 (en) * | 2017-05-11 | 2018-11-15 | Lydall, Inc. | Multilayer battery separator and method of making same |
-
2020
- 2020-01-17 CN CN202010055067.0A patent/CN111254745A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522514A (en) * | 2011-12-21 | 2012-06-27 | 莱州联友金浩新型材料有限公司 | High-temperature resistant micropore thin film material and application thereof |
| CN106537537A (en) * | 2014-07-18 | 2017-03-22 | 日本高度纸工业株式会社 | Separator for power storage device, and power storage device using same |
| CN108028132A (en) * | 2015-09-17 | 2018-05-11 | 日本高度纸工业株式会社 | Electro chemical elements use separator and electrochemical element |
| WO2018208517A1 (en) * | 2017-05-11 | 2018-11-15 | Lydall, Inc. | Multilayer battery separator and method of making same |
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Effective date of registration: 20200825 Address after: 323316 No.7 Chunhui Road, Yunfeng street, Suichang County, Lishui City, Zhejiang Province Applicant after: Zhejiang Chenlong special materials Co.,Ltd. Address before: No. 358, East mudanting Road, miaogao street, Suichang County, Lishui City, Zhejiang Province Applicant before: Zhejiang Tongchuang New Material Technology Co.,Ltd. |
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Application publication date: 20200609 |
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