CN103700808A - Lithium ion battery composite anode pole piece, preparation method and lithium ion battery - Google Patents
Lithium ion battery composite anode pole piece, preparation method and lithium ion battery Download PDFInfo
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- CN103700808A CN103700808A CN201310230676.5A CN201310230676A CN103700808A CN 103700808 A CN103700808 A CN 103700808A CN 201310230676 A CN201310230676 A CN 201310230676A CN 103700808 A CN103700808 A CN 103700808A
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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
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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
- 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
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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
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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
- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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
- H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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
Abstract
The invention discloses a lithium ion battery composite anode pole piece which comprises an anode current collector; two sides of the anode current collector are coated with a first coating layer and a second coating layer respectively; the coating slurry of the first coating layer is graphite slurry, and the coating slurry of the second coating layer is lithium titanate slurry. According to the invention, two sides of the anode current collector are respectively coated with a first coating layer comprising graphite, a binder, and a conductive agent, and a second coating layer comprising lithium titanate, a binder, and a conductive agent; with the characteristics of high gram capacity, excellent processing property, and low voltage platform of the graphite anode material, the energy density of the battery is increased; with the characteristics of good rate capability, excellent cycle performance, and good low temperature performance of the lithium titanate anode material, the application scope of the battery is enlarged, and the electrochemical performance of the battery is improved. The invention also discloses a preparation method of the composite anode pole piece, and a lithium ion battery comprising the composite anode pole piece.
Description
Technical field
The invention belongs to technical field of lithium ion, be specifically related to a kind of lithium ion battery composite cathode pole piece, also relate to a kind of preparation method of this composite negative pole pole piece simultaneously and use the lithium ion battery of this composite negative pole pole piece.
Background technology
Lithium ion battery is a kind of novel energy-storing power supply growing up in recent years, and, the characteristic such as energy density high, have extended cycle life, environmental friendliness easy to carry with it is widely used in the fields such as communication, electric motor car, energy storage.Meanwhile, the raising along with portable type electronic product requires lithium ion battery energy density, had both had high-energy-density, long circulation life, high rate capability, and the lithium ion battery again with high safety performance and good low temperature performance enjoys people to pay close attention to.
No matter be portable energy-storing battery or EV, HEV electrokinetic cell, lithium ion battery all needs to meet following characteristics: 1) high-energy-density and high power density; 2) working range is wide, and high temperature performance is excellent; 3) long cycle life and service life; 4) outstanding security performance.In order to meet handling characteristics more than lithium ion battery, need to select suitable lithium ion battery negative material.The negative material great majority that used are in the market graphite type material, its material has the advantages such as processing characteristics excellence, capacity is high, discharge voltage is low, but its material cycle life is general, high rate performance is poor, the characteristic limitations of poor safety performance its material to more excellent future development.Lithium titanate anode material has that security performance is high, have extended cycle life (cycle life can reach 20,000 times), the advantage such as cryogenic property is good, but the extensive use of its materials of characteristic limitations such as the specific capacity of its material is low, discharge voltage is high, processing characteristics deviation.Therefore develop a kind of not only there is higher energy density but also have have extended cycle life, the negative material of low temperature performance excellent becomes the important research direction of lithium ion battery.
Summary of the invention
The object of this invention is to provide and a kind ofly there is higher energy density, and cycle performance and the superior lithium ion battery composite cathode pole piece of cryogenic property.
Second object of the present invention is to provide a kind of preparation method of lithium ion battery composite cathode pole piece.
The 3rd object of the present invention is to provide a kind of lithium ion battery that uses above-mentioned composite negative pole pole piece.
In order to realize above object, the present invention adopts technical scheme as described below:
A kind of lithium ion battery composite cathode pole piece, comprise negative current collector, the two sides of described negative current collector is coated with respectively the first coat and the second coat, and the coating slurry of described the first coat is graphite slurry, and the coating slurry of described the second coat is lithium titanate slurry.
Described negative current collector is Copper Foil.
Described graphite slurry be by graphite, binding agent, conductive agent according to (92～96): (1～5): the mass ratio of (1～3) adds in deionized water and mixes and make.
Described lithium titanate slurry be by lithium titanate, binding agent, conductive agent according to (90～94): (4～7): the mass ratio of (2～3) adds in deionized water and mixes and make.
Described the first coat and the second coat binding agent used are a kind of of LA132 aqueous binders or CMC/SBR aqueous binders.
Described the first coat and the second coat conductive agent are carbon black, SP, one or more of carbon nano-tube compound;
A preparation method for above-mentioned lithium ion battery composite cathode pole piece, comprises the following steps:
1) graphite slurry preparation: according to graphite: binding agent: the mass ratio of conductive agent is (92～96): (1～5): the ratio of (1～3), graphite, binding agent, conductive agent are added in deionized water and mixed, obtain graphite slurry;
2) lithium titanate slurry preparation: according to lithium titanate: binding agent: the mass ratio of conductive agent is (90～94): (4～7): the ratio of (2～3), lithium titanate, binding agent, conductive agent are added in deionized water and mixed, obtain lithium titanate slurry;
3) slurry applies: the one side that step 1) gained graphite slurry is evenly coated in to negative current collector, after 70 ~ 90 ℃ of dry 0.1 ~ 1h, form the first coat, again by step 2) gained lithium titanate slurry is evenly coated in the another side of negative current collector, after 70 ~ 90 ℃ of dry 0.1 ~ 1h, form the second coat, obtain compound utmost point volume;
4) pole piece is dried and pressure roller: after the compound utmost point volume of step 3) gained is cut, dry and roll-in, obtains.
In step 3), the one side surface density of described the first coat is 40～50g/m
2; The one side surface density of described the second coat is 80～100g/m
2.
Described the first coat with the ratio of the one side surface density of the second coat is: the first coat: the second coat=1:2.
Described in step 4), dry temperature is 100～150 ℃, and be 24～72h drying time; The pressure of described roll-in is 2～30MPa.
A kind of lithium ion battery that uses above-mentioned composite negative pole pole piece, the cathode pole piece of described lithium ion battery comprises negative current collector, the two sides of described negative current collector is coated with respectively the first coat and the second coat, the coating slurry of described the first coat is graphite slurry, and the coating slurry of described the second coat is lithium titanate slurry.
Owing to adopting technique scheme, the present invention has following good effect:
Lithium ion battery composite cathode pole piece of the present invention, on negative current collector two sides, apply respectively the first coat that comprises graphite, binding agent, conductive agent, with the second coat that comprises lithium titanate, binding agent, conductive agent, the feature that utilize the gram volume of graphite cathode material high, processing characteristics is excellent, voltage platform is low improves the energy density of battery, utilizes lithium titanate anode material good rate capability, cycle performance is excellent, cryogenic property is good feature to expand the scope of application of battery and improves the chemical property of battery.Use lithium ion battery prepared by this composite negative pole pole piece when thering is superior cycle performance and cryogenic property, improved the energy density of battery.Due to the larger characteristic of the particle diameter of graphite type material and the less characteristic of lithium titanate particle diameter, make its storeroom produce cooperative effect, be that granule can be filled between bulky grain, increase contact probability and the compacted density of material, thereby improve multiplying power, the cryogenic property of bulky grain graphite-like; Graphite-like bulky grain can improve again the capacity of material and improve processing characteristics simultaneously, and reduce the problem that the processing such as granule reunion cause, thereby promote the performance of granule lithium titanate available capacity, promote the raising of energy density, both can give play to the characteristic that graphite type material capacity of tourists is high, can improve again multiplying power, the cycle performance of lithium titanate, thereby improve the overall performance of battery.The preparation method of lithium ion battery composite cathode pole piece of the present invention, adopt the technique of slurry preparation, slurry coating and the dry roll-in of pole piece, simple, convenient, the lithium ion battery composite cathode pole piece of preparation, when thering is superior cycle performance and cryogenic property, improve the energy density of battery, be applicable to large-scale industrial production.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated.
Embodiment 1
The lithium ion battery composite cathode pole piece of the present embodiment, comprise negative current collector, the two sides of described negative current collector is coated with respectively the first coat and the second coat, and the coating slurry of described the first coat is graphite slurry, and the coating slurry of described the second coat is lithium titanate slurry.Described negative current collector is Copper Foil.Described graphite slurry is that graphite, binding agent, conductive agent are added in deionized water and mix and make according to the mass ratio of 96:3:1.Described lithium titanate slurry is that lithium titanate, binding agent, conductive agent are added in deionized water and mix and make according to the mass ratio of 92:5:3.Described LA132 aqueous binders.Described conductive agent is carbon black.
The preparation method of the lithium ion battery composite cathode pole piece of the present embodiment, comprises the following steps:
1) graphite slurry preparation: take 3g binding agent, 1g carbon black, 50g deionized water and add and close in pulp grinder, stir 2h, then add 96g Delanium, stir 4h, then add 70g deionized water, be stirred to and mix, obtain graphite slurry;
2) lithium titanate slurry preparation: take 5g binding agent, 3g conductive agent, 60g deionized water and add and close in pulp grinder, stir 1h, then add 92g lithium titanate and 60g deionized water, be stirred to and mix, obtain lithium titanate slurry;
3) slurry applies: use coating machine step 1) gained graphite slurry to be evenly coated in to the one side of negative current collector Copper Foil, and dry rear first coat that forms, the one side surface density of the first coat is 40m
2/ g, then by step 2) gained lithium titanate slurry is evenly coated in the another side of negative current collector Copper Foil, forms the second coat after dry, and the one side surface density of the second coat is 80m
2/ g, obtains compound utmost point volume;
4) pole piece is dried and pressure roller: after the compound utmost point volume of step 3) gained is cut, and dry 48h under 120 ℃ of conditions, then carry out roll-in by roll squeezer, the pressure of roll-in is 30MPa, obtains.
The lithium ion battery of the composite negative pole pole piece that the use of the present embodiment is above-mentioned, the cathode pole piece of described lithium ion battery comprises negative current collector, the two sides of described negative current collector is coated with respectively the first coat and the second coat, the coating slurry of described the first coat is graphite slurry, and the coating slurry of described the second coat is lithium titanate slurry.Described graphite slurry is that graphite, binding agent, conductive agent are added in deionized water and mix and make according to the mass ratio of 96:3:1.Described lithium titanate slurry is that lithium titanate, binding agent, conductive agent are added in deionized water and mix and make according to the mass ratio of 92:5:3.Described negative current collector is Copper Foil.Described binding agent is LA132 aqueous binders.Described conductive agent is carbon black.
Embodiment 2
The lithium ion battery composite cathode pole piece of the present embodiment, comprise negative current collector, the two sides of described negative current collector is coated with respectively the first coat and the second coat, and the coating slurry of described the first coat is graphite slurry, and the coating slurry of described the second coat is lithium titanate slurry.Described negative current collector is Copper Foil.Described graphite slurry is that graphite, binding agent, conductive agent are added in deionized water and mix and make according to the mass ratio of 92:5:2.Described lithium titanate slurry is that lithium titanate, binding agent, conductive agent are added in deionized water and mix and make according to the mass ratio of 90:7:2.Described binding agent is CMC/SBR aqueous binders.Described conductive agent is SP.
The preparation method of the lithium ion battery composite cathode pole piece of the present embodiment, comprises the following steps:
1) graphite slurry preparation: take 5g binding agent, 2g carbon black, 60g deionized water and add and close in pulp grinder, stir 2h, then add 92g Delanium, stir 4h, then add 60g deionized water, be stirred to and mix, obtain graphite slurry;
2) lithium titanate slurry preparation: take 7g binding agent, 2g conductive agent, 65g deionized water and add and close in pulp grinder, stir 1h, then add 90g lithium titanate and 55g deionized water, be stirred to and mix, obtain lithium titanate slurry;
3) slurry applies: use coating machine step 1) gained graphite slurry to be evenly coated in to the one side of negative current collector Copper Foil, and dry rear first coat that forms, the one side surface density of the first coat is 45m
2/ g, then by step 2) gained lithium titanate slurry is evenly coated in the another side of negative current collector Copper Foil, forms the second coat after dry, and the one side surface density of the second coat is 95m
2/ g, obtains compound utmost point volume;
4) pole piece is dried and pressure roller: after the compound utmost point volume of step 3) gained is cut, and dry 24h under 150 ℃ of conditions, then carry out roll-in by roll squeezer, the pressure of roll-in is 2MPa, obtains.
The lithium ion battery of the composite negative pole pole piece that the use of the present embodiment is above-mentioned, the cathode pole piece of described lithium ion battery comprises negative current collector, the two sides of described negative current collector is coated with respectively the first coat and the second coat, the coating slurry of described the first coat is graphite slurry, and the coating slurry of described the second coat is lithium titanate slurry.Described negative current collector is Copper Foil.Described graphite slurry is that graphite, binding agent, conductive agent are added in deionized water and mix and make according to the mass ratio of 92:5:2.Described lithium titanate slurry is that lithium titanate, binding agent, conductive agent are added in deionized water and mix and make according to the mass ratio of 90:7:2.Described binding agent is LA132 aqueous adhesive.Described conductive agent is carbon black.
Embodiment 3
The lithium ion battery composite cathode pole piece of the present embodiment, comprise negative current collector, the two sides of described negative current collector is coated with respectively the first coat and the second coat, and the coating slurry of described the first coat is graphite slurry, and the coating slurry of described the second coat is lithium titanate slurry.Described negative current collector is Copper Foil.Described graphite slurry is that graphite, binding agent, conductive agent are added in deionized water and mix and make according to the mass ratio of 94:1:3.Described lithium titanate slurry is that lithium titanate, binding agent, conductive agent are added in deionized water and mix and make according to the mass ratio of 94:4:2.5.Described bonding agent is LA132 aqueous binders.Described conductive agent is carbon black.
The preparation method of the lithium ion battery composite cathode pole piece of the present embodiment, comprises the following steps:
1) graphite slurry preparation: take 1g binding agent, 3g carbon black, 45g deionized water and add and close in pulp grinder, stir 2h, then add 94g Delanium, stir 4h, then add 65g deionized water, be stirred to and mix, obtain graphite slurry;
2) lithium titanate slurry preparation: take 4g binding agent, 2.5g conductive agent, 65g deionized water and add and close in pulp grinder, stir 1h, then add 94g lithium titanate and 50g deionized water, be stirred to and mix, obtain lithium titanate slurry;
3) slurry applies: use coating machine step 1) gained graphite slurry to be evenly coated in to the one side of negative current collector Copper Foil, and dry rear first coat that forms, the one side surface density of the first coat is 50g/m
2, then by step 2) gained lithium titanate slurry is evenly coated in the another side of negative current collector Copper Foil, forms the second coat after dry, the one side surface density of the second coat is 100 g/m
2, obtain compound utmost point volume;
4) pole piece is dried and pressure roller: after the compound utmost point volume of step 3) gained is cut, and dry 72h under 100 ℃ of conditions, then carry out roll-in by roll squeezer, the pressure of roll-in is 15MPa, obtains.
The lithium ion battery of the composite negative pole pole piece that the use of the present embodiment is above-mentioned, the cathode pole piece of described lithium ion battery comprises negative current collector, the two sides of described negative current collector is coated with respectively the first coat and the second coat, the coating slurry of described the first coat is graphite slurry, and the coating slurry of described the second coat is lithium titanate slurry.Described negative current collector is Copper Foil.Described graphite slurry is that graphite, binding agent, conductive agent are added in deionized water and mix and make according to the mass ratio of 94:1:3.Described lithium titanate slurry is that lithium titanate, binding agent, conductive agent are added in deionized water and mix and make according to the mass ratio of 94:4:2.5.Described binding agent is LA132 aqueous adhesive.Described conductive agent is carbon black.
Experimental example
This experimental example is using embodiment 1～3 gained lithium ion battery composite cathode pole piece as negative pole, and LiFePO4 is as positive electrode, with the LiPF of 1.0mol/L
6/ EC+DEC(V
eC: V
dEC=1: 1) (EC:ethylene carbonate, ethylene carbonate; DEC:diethyl carbonate, diethyl carbonate) make electrolyte, U.S. Celgard 2300 is barrier film, prepares respectively the lithium ion battery of 5AH, afterwards to battery circulate, low-temperature test, test result is as shown in Table 1, 2 and 3.Wherein, the negative current collector two sides of the battery of comparative example 1 all applies graphite slurry, and the negative current collector two sides of the battery of comparative example 2 is lithium titanate coated slurry all, and other are equal conditions.
Table 1 cycle performance of lithium ion battery test result
Table 2 lithium ion battery cryogenic property test result
The comparison of table 3 lithium ion battery energy density
From upper table 1,2 and 3, with respect to negative current collector two sides, all apply all comparative examples 2 of lithium titanate coated slurry of the comparative example 1 of graphite slurry and negative current collector two sides, the lithium ion battery of the cathode pole piece of the employing embodiment of the present invention 1～3 had both improved the mass energy density of battery, had taken into account again circulation and the cryogenic property of battery.
Claims (10)
1. a lithium ion battery composite cathode pole piece, comprise negative current collector, it is characterized in that: described negative current collector is Copper Foil, the two sides of described negative current collector is coated with respectively the first coat and the second coat, the coating slurry of described the first coat is graphite slurry, and the coating slurry of described the second coat is lithium titanate slurry.
2. lithium ion battery composite cathode pole piece according to claim 1, is characterized in that: described graphite slurry be by graphite, binding agent, conductive agent according to (92～96): (1～5): the mass ratio of (1～3) adds in deionized water and mixes and make.
3. lithium ion battery composite cathode pole piece according to claim 1, is characterized in that: described lithium titanate slurry be by lithium titanate, binding agent, conductive agent according to (90～94): (4～7): the mass ratio of (2～3) adds in deionized water and mixes and make.
4. according to the lithium ion battery composite cathode pole piece described in claim 2 or 3, it is characterized in that: described binding agent is a kind of of LA132 aqueous binders or CMC/SBR aqueous binders.
5. according to the lithium ion battery composite cathode pole piece described in claim 3 or 4, it is characterized in that: described conductive agent is carbon black, SP one or more of carbon nano-tube compound.
6. a preparation method for the lithium ion battery composite cathode pole piece described in claim 1 to 5 any one, is characterized in that: comprise the following steps:
1) graphite slurry preparation: according to graphite: binding agent: the mass ratio of conductive agent is (92～96): (1～5): the ratio of (1～3), graphite, binding agent, conductive agent are added in deionized water and mixed, obtain graphite slurry;
2) lithium titanate slurry preparation: according to lithium titanate: binding agent: the mass ratio of conductive agent is (90～94): (4～7): the ratio of (2～3), lithium titanate, binding agent, conductive agent are added in deionized water and mixed, obtain lithium titanate slurry;
3) slurry applies: the one side that step 1) gained graphite slurry is evenly coated in to negative current collector, after 70 ~ 90 ℃ of dry 0.1 ~ 1h, form the first coat, again by step 2) gained lithium titanate slurry is evenly coated in the another side of negative current collector, after 70 ~ 90 ℃ of dry 0.1 ~ 1h, form the second coat, obtain compound utmost point volume;
4) pole piece is dried and pressure roller: after the compound utmost point volume of step 3) gained is cut, dry and roll-in, obtains.
7. the preparation method of lithium ion battery composite cathode pole piece according to claim 6, is characterized in that: in step 3), the one side surface density of described the first coat is 40～50g/m
2; The one side surface density of described the second coat is 80～100g/m
2.
8. the preparation method of lithium ion battery composite cathode pole piece according to claim 7, is characterized in that: described the first coat with the ratio of the one side surface density of the second coat is: the first coat: the second coat=1:2.
9. the preparation method of lithium ion battery composite cathode pole piece according to claim 6, is characterized in that: described in step 4), dry temperature is 100～150 ℃, and be 24～72h drying time; The pressure of described roll-in is 2～30MPa.
10. a right to use requires the lithium ion battery of the composite negative pole pole piece described in 1 to 6 any one, it is characterized in that: the cathode pole piece of described lithium ion battery comprises negative current collector, the two sides of described negative current collector is coated with respectively the first coat and the second coat, the coating slurry of described the first coat is graphite slurry, and the coating slurry of described the second coat is lithium titanate slurry.
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| CN114156437A (en) * | 2021-11-19 | 2022-03-08 | 浙江南都电源动力股份有限公司 | High-area-density lithium battery negative plate, preparation method and lithium battery |
| CN114792808A (en) * | 2021-01-25 | 2022-07-26 | 华为技术有限公司 | Negative plate of lithium ion battery, lithium ion battery and electronic equipment |
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| CN108666632A (en) * | 2017-03-28 | 2018-10-16 | 太阳诱电株式会社 | Electrochemical device |
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Denomination of invention: The invention relates to a lithium ion battery composite negative electrode sheet, a preparation method and a lithium ion battery Effective date of registration: 20210220 Granted publication date: 20160608 Pledgee: Luoyang Rural Commercial Bank Co.,Ltd. Hanghe Branch Pledgor: LUOYANG YUEXING NEW ENERGY TECHNOLOGY Co.,Ltd. Registration number: Y2021980001239 |