CN113839003B - Preparation method of nickel-zinc battery negative plate - Google Patents
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Abstract
The invention relates to the field of nickel-zinc batteries, and discloses a preparation method of a nickel-zinc battery negative plate, which aims to solve the problems of poor cohesiveness and conductivity of the negative plate of the nickel-zinc battery in the prior art and comprises the following steps: uniformly mixing a negative electrode active material, a conductive agent and a binder according to different proportions to prepare bonding layer slurry and reaction layer slurry, wherein the binder content in the bonding layer slurry is higher than that in the reaction layer slurry, and the conductive agent content is lower than that in the reaction layer slurry; and uniformly coating the adhesive layer slurry on the current collector to form an adhesive layer, uniformly coating the reaction layer slurry on the adhesive layer after drying to form a reaction layer, and drying, rolling and die-cutting to prepare the negative plate. The invention improves the cohesiveness between the negative electrode slurry and the current collector, thereby prolonging the cycle life of the negative electrode plate of the nickel-zinc battery, improving the conductivity of the negative electrode plate of the nickel-zinc battery, and leading the negative electrode plate to have better cycle performance and higher specific energy.
Description
Technical Field
The invention relates to the field of nickel-zinc batteries, in particular to a preparation method of a nickel-zinc battery negative electrode sheet.
Background
At present, domestic and civil battery cells such as digital cameras, electric toys, remote controllers and the like mainly comprise: nickel-cadmium battery, nickel-hydrogen battery, nickel-zinc battery, but nickel-cadmium battery is not friendly to environment, pollution is serious, and memory effect exists; nickel-hydrogen batteries have low discharge voltages and require the use of large amounts of rare earth materials; the nickel-zinc battery has the advantages of safety, environmental protection, high discharge voltage, high discharge power, high specific energy and the like, and has wider application range and better development potential compared with nickel-cadmium batteries and nickel-hydrogen batteries. But the ZnO used in nickel zinc batteries has the disadvantage of limiting the improvement in performance of nickel zinc batteries.
The nano or micron ZnO has better conductivity, so the nano or micron ZnO is often used as a negative electrode active material for a nickel-zinc battery, but the nano or micron ZnO reduces the fluidity of the negative electrode slurry, so that the cohesiveness of the negative electrode slurry and a current collector is poor, the internal resistance of a battery cell is increased, and the cycle performance and the multiplying power performance of the battery cell are seriously affected. At present, aiming at the defect of poor cohesiveness and conductivity of ZnO anode slurry, the conventional improvement means is to increase the consumption of a binder and the consumption of a conductive agent, but the increase of the binder increases the internal resistance of a battery core, and the increase of the binder is not ideal for improving the adhesion effect of the slurry and a current collector because of thicker anode coating; the use amount of the nano-level conductive agent is increased, the requirement on the cohesive strength is certainly improved, and meanwhile, the use amount of the adhesive and the conductive agent is increased, so that the content of active substances in the slurry is reduced, and the specific energy of the battery cell is reduced.
For example, "a nickel-zinc battery" disclosed in the chinese patent literature, its bulletin number is CN111048846a, its electrolyte is composed of hydroxide base, corrosion inhibitor, surface active additive, zinc oxide, deionized water, its mass ratio is: 15-35% of hydroxide alkali, 0.1-10% of corrosion inhibitor, 0.01-5% of surface active additive and proper amount of zinc oxide are added to saturated and the balance of deionized water. The invention relieves the dissolution deformation of the electrode and the formation of zinc dendrites, but does not solve the problem of poor cohesiveness of zinc oxide.
Disclosure of Invention
The invention aims to solve the problems of poor adhesion and conductivity of a negative electrode piece of a nickel-zinc battery in the prior art, and provides a preparation method of the negative electrode piece of the nickel-zinc battery, which can obviously improve the problems of poor adhesion and conductivity of the negative electrode piece, so that the negative electrode piece has better cycle performance, rate performance and higher specific energy.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the preparation method of the nickel-zinc battery negative plate comprises the following steps:
(1) Uniformly mixing a negative electrode active material, a conductive agent and a binder according to different proportions to prepare bonding layer slurry and reaction layer slurry, wherein the binder content in the bonding layer slurry is higher than that in the reaction layer slurry, and the conductive agent content is lower than that in the reaction layer slurry;
(2) And uniformly coating the adhesive layer slurry on the current collector to form an adhesive layer, uniformly coating the reaction layer slurry on the adhesive layer after drying to form a reaction layer, and drying, rolling and die-cutting to prepare the negative plate.
In a nickel zinc battery, zinc oxide is used as a negative electrode active material, the higher the content of the negative electrode active material in the negative electrode slurry is, the higher the specific energy of a negative electrode plate is, but when the content of the zinc oxide in the negative electrode slurry is higher, the bonding effect of the slurry and a current collector is poorer, so that a layer of bonding layer with better bonding effect with the current collector is arranged on the negative electrode plate, then a reaction layer with high specific energy is coated on the bonding layer, and compared with the single reaction layer, the bonding effect of the bonding layer and the reaction layer is higher in the specific energy of the whole body, and is better than the bonding effect of the reaction layer on the current collector. Nanoscale conductive agents also reduce the adhesion of the paste, and therefore, a tie-layer paste having a higher binder content and a lower conductive agent content is used as the tie layer.
Preferably, in the step (1), the kind of the negative electrode active material, the conductive agent, and the binder in the adhesive layer slurry and the reaction layer slurry are the same.
When the bonding performance between the bonding layer and the reaction layer is poor, the reaction layer is easy to fall off the powder from the bonding layer, so that the service life of the negative electrode plate is reduced, and the internal resistance of the negative electrode plate is increased. According to the similar principle of intermiscibility, when the anode active material, the binder and the conductive agent in the reaction layer are selected from the anode active material, the binder and the conductive agent which are consistent with the bonding layer, the bonding property with the bonding layer is better although the binder content in the slurry of the reaction layer is lower and the conductive agent content is higher.
Preferably, in the step (1), the mass ratio of the anode active material, the conductive agent and the binder of the bonding layer slurry is (85-95): 2-7): 2-8, and the mass ratio of the anode active material, the conductive agent and the binder of the reaction layer slurry is (85-95): 3-10): 1-5.
Preferably, in the step (1), the negative electrode active material is one or a mixture of several of zinc oxide, calcium zincate, zinc powder and polydopamine loaded with zinc oxide.
The addition of calcium zincate and zinc powder to the negative active material of a nickel zinc cell improves the electrical properties of zinc oxide. The polydopamine has good adhesion capability and good conductivity, and the combination of zinc oxide and polydopamine balls can improve the cohesiveness of zinc oxide, improve the conductivity of the cathode slurry, and inhibit zinc dendrite growth. The ratio of zinc-containing substances in the negative electrode active material can be increased by mixing the polydopamine loaded with zinc oxide with one or more of zinc oxide, calcium zincate and zinc powder in the mass ratio of (2-1): 1, so that the capacity of the negative electrode sheet can be increased.
Preferably, the preparation method of the zinc oxide-loaded polydopamine comprises the following steps:
A. adding dopamine hydrochloride into ethanol water solution with the volume fraction of 10-40% of ethanol in the mass-volume ratio of (5-10) g to 1000mL, uniformly mixing, adding calcium hydroxide to adjust the pH of the solution to 8.0-10.0, and heating to 40-50 ℃ for reaction for 10-20h;
B. adding zinc salt into the solution containing polydopamine obtained in the step A to saturation, uniformly stirring, and heating to 60-80 ℃ for hydrothermal reaction for 2-5h;
C. and D, washing, drying and crushing the polydopamine loaded with zinc oxide obtained in the step B.
The dopamine hydrochloride can be polymerized into polydopamine spheres by itself under alkaline condition, and nano-sheet zinc oxide is deposited on the surfaces and the interiors of the polydopamine spheres in hydrothermal reaction. The polymerization rate of dopamine is affected by temperature, and when the temperature is higher, the polymerization rate is faster, so that the phenomenon of partial agglomeration is overlarge, and ethanol needs to be added into a reaction system to reduce the polymerization rate of dopamine.
Preferably, in the step B, the zinc salt is zinc nitrate, zinc acetate or zinc chloride.
Preferably, in the step (1), the binder is one or a mixture of two or more of sodium carboxymethyl cellulose, styrene-butadiene rubber, sodium alginate, polyvinyl alcohol, polyacrylic acid, polytetrafluoroethylene and polyethylene oxide.
The polydopamine has adhesion effect on sodium carboxymethyl cellulose, sodium alginate, polyvinyl alcohol, polyacrylic acid, polytetrafluoroethylene and polyethylene oxide, and when the polydopamine loaded with zinc oxide is used as the negative electrode active material, the polydopamine can be adhered with a binder in an alkaline solution, so that the adhesion of the negative electrode slurry is further improved.
Preferably, in the step (1), the conductive agent is one or a mixture of two or more of activated carbon, conductive carbon black, carbon nanotubes, graphene and vapor grown carbon fibers.
Preferably, in the step (2), the current collector is one of an electrolytic copper foil, a copper mesh and a copper strip.
Preferably, in the step (2), the thickness ratio of the adhesive layer to the reaction layer is 1 (2-15), and the coating width of the reaction layer is 95-90% of the coating width of the adhesive layer.
In a certain range, the thickness of the bonding layer is increased to improve the bonding property of the bonding layer and the whole reaction layer, but when the thickness of the bonding layer is larger, the internal resistance of the negative plate is larger, the conductivity of the negative plate can be reduced, and when the coating width of the reaction layer is smaller than the coating width of the bonding layer, the bonding effect between the reaction layer and the bonding layer is better.
Therefore, the invention has the following beneficial effects: (1) The cohesiveness between the negative electrode slurry and the current collector is improved, so that the cycle life of the negative electrode plate of the nickel-zinc battery is prolonged; (2) The conductivity of the nickel-zinc battery negative electrode plate is improved, so that the negative electrode plate has better cycle performance and higher specific energy.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention, wherein the 1-current collector, 2-adhesive layer, 3-reaction layer.
Detailed Description
The invention is further described below in connection with specific embodiments.
Example 1
1. Mixing zinc oxide and zinc powder in a mass ratio of 6:1 to obtain a negative electrode active material;
2. uniformly mixing the anode active material, the conductive carbon black, the sodium carboxymethyl cellulose and the styrene-butadiene rubber obtained in the step 1 according to the mass ratio of 90:3:2:1 to prepare bonding layer slurry, and uniformly mixing the anode active material, the conductive carbon black, the sodium carboxymethyl cellulose and the styrene-butadiene rubber obtained in the step 3 according to the mass ratio of 90:5:3:2 to prepare reaction layer slurry;
3. uniformly coating the adhesive layer slurry on a copper mesh to form an adhesive layer, uniformly coating the dried reaction layer slurry on the adhesive layer to form a reaction layer, and drying, rolling and die-cutting to prepare a negative plate;
the structure of the prepared negative plate is shown in figure 1, a current collector is coated with a bonding layer formed by bonding layer slurry, the bonding layer is coated with a reaction layer formed by bonding layer slurry, the bonding layer has a width of 200mm and a thickness of 10 mu m, and the reaction layer has a width of 180mm and a thickness of 100 mu m.
Example 2
1. Mixing zinc oxide and zinc powder in a mass ratio of 6:1 to obtain a negative electrode active material;
2. uniformly mixing the anode active material, the conductive carbon black, the sodium carboxymethyl cellulose and the styrene-butadiene rubber obtained in the step 1 according to the mass ratio of 90:3:2:1 to prepare bonding layer slurry, and uniformly mixing the anode active material, the conductive carbon black, the sodium carboxymethyl cellulose and the styrene-butadiene rubber obtained in the step 3 according to the mass ratio of 90:5:3:2 to prepare reaction layer slurry;
3. and uniformly coating the adhesive layer slurry on a copper mesh to form an adhesive layer, uniformly coating the reaction layer slurry on the adhesive layer after drying to form a reaction layer, and drying, rolling and die cutting to obtain the negative plate with the adhesive layer width of 200mm, the thickness of 10 mu m, the reaction layer width of 180mm and the thickness of 150 mu m.
Example 3
1. Adding dopamine hydrochloride into an ethanol water solution with the volume fraction of 20% according to the mass volume ratio of 10g to 1000mL, uniformly mixing, then adding calcium hydroxide to adjust the pH of the solution to 8.0, and heating to 50 ℃ for reaction for 10h;
2. adding zinc nitrate into the solution containing polydopamine obtained in the step 1 to be saturated, uniformly stirring, and heating to 80 ℃ for hydrothermal reaction for 3 hours;
3. washing, drying and crushing the polydopamine loaded with zinc oxide obtained in the step 2, and mixing the polydopamine with zinc oxide and zinc powder in a mass ratio of 2:0.6:0.4 to obtain a negative electrode active material;
4. uniformly mixing the anode active material, the conductive carbon black, the sodium carboxymethyl cellulose and the styrene-butadiene rubber obtained in the step 3 according to the mass ratio of 90:3:2:1 to prepare bonding layer slurry, and uniformly mixing the anode active material, the conductive carbon black, the sodium carboxymethyl cellulose and the styrene-butadiene rubber obtained in the step 3 according to the mass ratio of 90:5:3:2 to prepare reaction layer slurry;
5. and uniformly coating the adhesive layer slurry on a copper mesh to form an adhesive layer, uniformly coating the dried reaction layer slurry on the adhesive layer to form a reaction layer, and drying, rolling and die cutting to obtain the negative plate with the adhesive layer width of 200mm, the thickness of 10 mu m, the reaction layer width of 180mm and the thickness of 100 mu m.
Example 4
1. Adding dopamine hydrochloride into an ethanol water solution with the volume fraction of 20% according to the mass volume ratio of 10g to 1000mL, uniformly mixing, then adding calcium hydroxide to adjust the pH of the solution to 8.0, and heating to 50 ℃ for reaction for 10h;
2. adding zinc nitrate into the solution containing polydopamine obtained in the step 1 to be saturated, uniformly stirring, and heating to 80 ℃ for hydrothermal reaction for 3 hours;
3. washing, drying and crushing the polydopamine loaded with zinc oxide obtained in the step 2, and mixing the polydopamine with zinc oxide and zinc powder in a mass ratio of 2:0.6:0.4 to obtain a negative electrode active material;
4. uniformly mixing the anode active material, the conductive carbon black and the polytetrafluoroethylene obtained in the step 3 according to the mass ratio of 90:3:3 to prepare bonding layer slurry, and uniformly mixing the anode active material, the conductive carbon black and the polytetrafluoroethylene obtained in the step 3 according to the mass ratio of 90:5:5 to prepare reaction layer slurry;
5. and uniformly coating the adhesive layer slurry on the copper belt to form an adhesive layer, uniformly coating the dried reaction layer slurry on the adhesive layer to form a reaction layer, and drying, rolling and die cutting to obtain the negative plate with the adhesive layer width of 200mm, the thickness of 10 mu m, the reaction layer width of 180mm and the thickness of 150 mu m.
Example 5
1. Adding dopamine hydrochloride into an ethanol water solution with the volume fraction of 20% according to the mass volume ratio of 10g to 1000mL, uniformly mixing, then adding calcium hydroxide to adjust the pH of the solution to 8.0, and heating to 50 ℃ for reaction for 10h;
2. adding zinc nitrate into the solution containing polydopamine obtained in the step 1 to be saturated, uniformly stirring, and heating to 80 ℃ for hydrothermal reaction for 3 hours;
3. washing, drying and crushing the polydopamine loaded with zinc oxide obtained in the step 2 to obtain a negative electrode active material;
4. uniformly mixing the anode active material, the conductive carbon black, the sodium carboxymethyl cellulose and the styrene-butadiene rubber obtained in the step 3 according to the mass ratio of 90:3:2:1 to prepare bonding layer slurry, and uniformly mixing the anode active material, the conductive carbon black, the sodium carboxymethyl cellulose and the styrene-butadiene rubber obtained in the step 3 according to the mass ratio of 90:5:3:2 to prepare reaction layer slurry;
5. and uniformly coating the adhesive layer slurry on a copper mesh to form an adhesive layer, uniformly coating the dried reaction layer slurry on the adhesive layer to form a reaction layer, and drying, rolling and die cutting to obtain the negative plate with the adhesive layer width of 200mm, the thickness of 10 mu m, the reaction layer width of 180mm and the thickness of 100 mu m.
Comparative example 1
1. Mixing zinc oxide and zinc powder in a mass ratio of 6:1 to obtain a negative electrode active material;
2. uniformly mixing the anode active material obtained in the step 1, conductive carbon black, sodium carboxymethyl cellulose and styrene-butadiene rubber according to the mass ratio of 90:5:3:2 to prepare anode slurry;
3. the slurry is uniformly coated on a copper mesh, and the negative plate with the width of 200mm and the thickness of 100 mu m is manufactured through drying, rolling and die cutting.
Comparative example 2
1. Mixing zinc oxide and zinc powder in a mass ratio of 6:1 to obtain a negative electrode active material;
2. uniformly mixing the anode active material obtained in the step 1, vapor grown carbon fiber and polytetrafluoroethylene according to the mass ratio of 90:3:3 to prepare bonding layer slurry, and uniformly mixing the anode active material obtained in the step 3, conductive carbon black, sodium carboxymethyl cellulose and styrene-butadiene rubber according to the mass ratio of 90:5:3:2 to prepare reaction layer slurry;
3. and uniformly coating the adhesive layer slurry on a copper mesh to form an adhesive layer, uniformly coating the dried reaction layer slurry on the adhesive layer to form a reaction layer, and drying, rolling and die cutting to obtain the negative plate with the adhesive layer width of 200mm, the thickness of 10 mu m, the reaction layer width of 180mm and the thickness of 100 mu m.
Comparative example 3
1. Mixing zinc oxide and zinc powder in a mass ratio of 6:1 to obtain a negative electrode active material;
2. uniformly mixing the anode active material, the conductive carbon black, the sodium carboxymethyl cellulose and the styrene-butadiene rubber obtained in the step 1 according to the mass ratio of 90:3:2:1 to prepare bonding layer slurry, and uniformly mixing the anode active material, the conductive carbon black, the sodium carboxymethyl cellulose and the styrene-butadiene rubber obtained in the step 3 according to the mass ratio of 90:5:3:2 to prepare reaction layer slurry;
3. and uniformly coating the adhesive layer slurry on a copper mesh to form an adhesive layer, uniformly coating the dried reaction layer slurry on the adhesive layer to form a reaction layer, and drying, rolling and die cutting to obtain the anode plate with the adhesive layer width of 190mm, the thickness of 10 mu m, the reaction layer width of 200mm and the thickness of 100 mu m.
The nickel-zinc battery negative electrode sheet obtained in the above examples and comparative examples was combined with a nickel hydroxide positive electrode, lithium hydroxide and potassium hydroxide mixed electrolyte to form a nickel-zinc battery, and then performance test was performed on the nickel-zinc battery by the following steps:
1. capacity testing
Charging the battery to 1.9V at a constant current of 0.5C, standing for 10min, discharging to 1.2V at 1.0C, and recording capacity;
2. internal resistance test
Connecting the anode and the cathode of the battery with a tester by using an alternating current impedance tester, and directly reading internal resistance data;
3. cycle life test
1. Constant current charging to 1.9V at 0.5C;
2. standing for 10min;
3. 1.0C discharge to 1.2V;
4. standing for 10min;
5. and (3) cycling the steps 1 to 4, wherein the number of times of cycling is recorded when the recording capacity is lower than 60% of the initial capacity.
The data obtained are shown in the following table:
the nickel-zinc battery negative plate prepared by the preparation method has high capacity, good conductivity and long cycle life. Compared with comparative example 1 with a single-layer coating, the negative electrode sheet prepared in example 1 has the advantages of increased cycle times, reduced internal resistance, and smaller capacity difference from that of comparative example 1, which indicates that the addition of the adhesive layer in the negative electrode sheet can greatly improve the service life and conductivity of the negative electrode sheet and has less influence on capacity.
The adhesion between the adhesive layer and the reaction layer also affects the service life of the negative electrode sheet. The internal resistance of comparative example 2 was higher than that of example 1 and the number of cycles was lower than that of example 1 because the kinds of the conductive agent and the binder of the adhesive layer slurry and the reactive layer slurry in example 1 were the same, and the adhesive property between the adhesive layer and the reactive layer in example 1 was good according to the similar compatibility principle, whereas the kinds of the binder and the conductive agent used in the adhesive layer and the reactive layer slurry in comparative example 1 were different, which resulted in poor adhesion between the adhesive layer and the reactive layer, and the reactive layer was liable to be peeled off from the adhesive layer.
The thickness ratio of the adhesive layer to the reaction layer and the coating width affect the capacity, conductivity and service life of the negative electrode sheet. The test data of comparative examples 1 and 2 show that the reaction layer thickness ratio increases, the capacity of the negative electrode sheet increases, the internal resistance decreases, but the adhesiveness decreases, resulting in a decrease in cycle life. In comparative example 3, the coating width of the negative electrode tab adhesive layer was smaller than that of the reaction layer, and the volume of the reaction layer of the negative electrode tab prepared in comparative example 3 was increased, but the capacity of the negative electrode tab was decreased and the cycle life was reduced, as compared with example 1.
The negative electrode sheets obtained in examples 3 and 4 were better than that of example 1, which shows that the use of polydopamine loaded with zinc oxide in the negative electrode active material can improve the adhesiveness of zinc oxide and improve the conductivity of the negative electrode slurry. As is apparent from the performance data of example 5, the use of only polydopamine loaded with zinc oxide without zinc oxide in the preparation process of the negative electrode active material increases the service life of the negative electrode sheet, but decreases the capacity.
Claims (8)
1. The preparation method of the nickel-zinc battery negative plate is characterized by comprising the following steps of:
(1) Uniformly mixing a negative electrode active material, a conductive agent and a binder according to different proportions to prepare bonding layer slurry and reaction layer slurry, wherein the binder content in the bonding layer slurry is higher than that in the reaction layer slurry, and the conductive agent content is lower than that in the reaction layer slurry;
(2) Uniformly coating the adhesive layer slurry on the current collector to form an adhesive layer, uniformly coating the reaction layer slurry on the adhesive layer after drying to form a reaction layer, and drying, rolling and die-cutting to prepare a negative plate;
in the step (1), the negative electrode active material is prepared by mixing polydopamine loaded with zinc oxide and one or more of zinc oxide, calcium zincate and zinc powder in a mass ratio of (1-2): 1;
the preparation method of the zinc oxide-loaded polydopamine comprises the following steps:
A. adding dopamine hydrochloride into ethanol water solution with the volume fraction of 10-40% of ethanol in the mass-volume ratio of (5-10) g to 1000mL, uniformly mixing, adding calcium hydroxide to adjust the pH of the solution to 8.0-10.0, heating to 40-50 ℃ and reacting for 10-20h;
B. adding zinc salt into the solution containing polydopamine obtained in the step A to saturation, uniformly stirring, and heating to 60-80 ℃ for hydrothermal reaction for 2-5h;
C. and D, washing, drying and crushing the polydopamine loaded with zinc oxide obtained in the step B.
2. The method for preparing a negative electrode sheet for a nickel-zinc cell according to claim 1, wherein in the step (1), the kind of the negative electrode active material, the kind of the conductive agent, and the kind of the binder in the adhesive layer paste and the kind of the negative electrode active material, the kind of the conductive agent, and the kind of the binder in the reaction layer paste are the same.
3. The method for preparing the nickel-zinc battery negative electrode sheet according to claim 1 or 2, wherein in the step (1), the mass ratio of the negative electrode active material, the conductive agent and the binder of the bonding layer slurry is (85-95): 2-7): 2-8, and the mass ratio of the negative electrode active material, the conductive agent and the binder of the reaction layer slurry is (85-95): 3-10): 1-5.
4. The method for preparing a negative electrode sheet of a nickel-zinc battery according to claim 1, wherein in the step B, the zinc salt is zinc nitrate, zinc acetate or zinc chloride.
5. The method for preparing a negative electrode plate of a nickel-zinc battery according to claim 1, wherein in the step (1), the binder is one or more of sodium carboxymethyl cellulose, styrene-butadiene rubber, polyvinyl alcohol, polyacrylic acid, polytetrafluoroethylene and polyethylene oxide.
6. The method for preparing a negative electrode plate of a nickel-zinc battery according to claim 1, wherein in the step (1), the conductive agent is one or more of activated carbon, conductive carbon black, carbon nanotubes, graphene and vapor grown carbon fibers.
7. The method for preparing a negative electrode sheet of a nickel-zinc battery according to claim 1, wherein in the step (2), the current collector is one of an electrolytic copper foil and a copper mesh.
8. The method for preparing a negative electrode sheet for a nickel-zinc cell according to claim 1, wherein in the step (2), the thickness ratio of the adhesive layer to the reaction layer is 1 (2-15), and the coating width of the reaction layer is 95-90% of the coating width of the adhesive layer.
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| CN106206065A (en) * | 2016-09-14 | 2016-12-07 | 安徽师范大学 | A kind of electrode material for super capacitor MnO2the preparation method of@PDA nano composite material |
| CN112768678A (en) * | 2019-11-05 | 2021-05-07 | 贝特瑞新材料集团股份有限公司 | Negative electrode material, preparation method thereof and lithium ion battery |
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