CN116799206A - Sodium ion battery negative electrode slurry and sodium ion battery negative electrode plate - Google Patents
Sodium ion battery negative electrode slurry and sodium ion battery negative electrode plate Download PDFInfo
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- 229910001415 sodium ion Inorganic materials 0.000 title claims abstract description 71
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 239000011267 electrode slurry Substances 0.000 title claims abstract description 60
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 29
- 239000011888 foil Substances 0.000 claims abstract description 29
- 239000000080 wetting agent Substances 0.000 claims abstract description 23
- 239000011248 coating agent Substances 0.000 claims abstract description 17
- 238000000576 coating method Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims abstract description 10
- 239000011230 binding agent Substances 0.000 claims abstract description 9
- 239000006258 conductive agent Substances 0.000 claims abstract description 9
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 9
- 239000006183 anode active material Substances 0.000 claims abstract description 7
- -1 amine compound Chemical class 0.000 claims abstract description 6
- 239000011149 active material Substances 0.000 claims abstract description 3
- 238000001035 drying Methods 0.000 claims description 15
- 238000003825 pressing Methods 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 11
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 11
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 10
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 10
- 229920002125 Sokalan® Polymers 0.000 claims description 4
- 239000004584 polyacrylic acid Substances 0.000 claims description 4
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 2
- 229920000058 polyacrylate Polymers 0.000 claims description 2
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 2
- 239000000661 sodium alginate Substances 0.000 claims description 2
- 235000010413 sodium alginate Nutrition 0.000 claims description 2
- 229940005550 sodium alginate Drugs 0.000 claims description 2
- 239000006256 anode slurry Substances 0.000 abstract description 3
- 239000002002 slurry Substances 0.000 description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 229910021385 hard carbon Inorganic materials 0.000 description 9
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 8
- 239000000839 emulsion Substances 0.000 description 8
- 238000002360 preparation method Methods 0.000 description 8
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 8
- HXKKHQJGJAFBHI-UHFFFAOYSA-N 1-aminopropan-2-ol Chemical compound CC(O)CN HXKKHQJGJAFBHI-UHFFFAOYSA-N 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 229940102253 isopropanolamine Drugs 0.000 description 7
- 239000007773 negative electrode material Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 239000006257 cathode slurry Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- DLNKOYKMWOXYQA-UHFFFAOYSA-N dl-pseudophenylpropanolamine Natural products CC(N)C(O)C1=CC=CC=C1 DLNKOYKMWOXYQA-UHFFFAOYSA-N 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- CRVGTESFCCXCTH-UHFFFAOYSA-N methyl diethanolamine Chemical compound OCCN(C)CCO CRVGTESFCCXCTH-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- DLNKOYKMWOXYQA-APPZFPTMSA-N phenylpropanolamine Chemical compound C[C@@H](N)[C@H](O)C1=CC=CC=C1 DLNKOYKMWOXYQA-APPZFPTMSA-N 0.000 description 2
- 229960000395 phenylpropanolamine Drugs 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- LVTYICIALWPMFW-UHFFFAOYSA-N diisopropanolamine Chemical compound CC(O)CNCC(C)O LVTYICIALWPMFW-UHFFFAOYSA-N 0.000 description 1
- 229940043276 diisopropanolamine Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910021384 soft carbon Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
-
- 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
- H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
Abstract
The invention belongs to the technical field of secondary batteries, and particularly relates to sodium ion battery negative electrode slurry and a sodium ion battery negative electrode plate. The sodium ion battery negative electrode slurry comprises the following components in parts by weight: 90-95 parts of anode active material, 1.0-5.0 parts of binder, 1.0-5.0 parts of conductive agent and 0.5-2.0 parts of wetting agent, wherein the wetting agent is an amine compound containing hydroxyl and methyl in the structure, and the anode slurry of the sodium ion battery is obtained after the wetting agent, the active material, the conductive agent, the binder and water are uniformly stirred. The amine compound with the structure containing hydroxyl and methyl is used as a wetting agent and added into the sodium ion battery negative electrode slurry, so that the problem that the coating is uneven due to poor wettability of the negative electrode slurry when the surface of an aluminum foil is coated is solved with lower cost, and the sodium ion battery negative electrode plate with even and smooth surface can be obtained by coating the aluminum foil, and the sodium ion battery negative electrode plate has good electrochemical performance when used for a sodium ion battery.
Description
Technical Field
The invention belongs to the technical field of secondary batteries, and particularly relates to sodium ion battery negative electrode slurry and a sodium ion battery negative electrode plate.
Background
Because of lower cost, high safety performance, excellent cycle performance and low temperature performance, the application of sodium ion batteries in low-speed electric vehicles, large-scale energy storage systems, mineral products and other high-risk industries will become more and more important in the future. In the sodium ion battery system, sodium ions cannot form alloy with aluminum metal, so that the negative electrode current collector can replace copper foil with aluminum foil to reduce cost. At present, in the aspect of manufacturing a negative electrode plate, deionized water is mainly used as a solvent, carboxymethyl cellulose (CMC) is used as a thickener, styrene-butadiene rubber (SBR) is used as a binder to prepare negative electrode slurry, and most of sodium ion battery negative electrode active materials, such as hard carbon, soft carbon and the like, are prepared by adopting water-based slurry, and when the slurry is prepared, the slurry surface tension is large, the aluminum foil surface tension is small, so that the wettability of the negative electrode slurry on the aluminum foil surface is poor, uniform coating cannot be realized, and the commercialization process of the sodium ion battery is seriously influenced.
In order to solve the wettability problem, carbon-coated aluminum foil and corona aluminum foil are generally adopted to improve the surface tension of the aluminum foil, so that the wettability of the negative electrode slurry is improved, and shrinkage and non-uniformity of the negative electrode slurry are avoided. However, carbon coated aluminum foil and corona aluminum foil are relatively costly and do not have the advantage of low cost over copper foil. Therefore, the problem of poor wettability of the negative electrode slurry of the sodium ion battery when the surface of the aluminum foil is coated is a technical bottleneck which needs to be solved in large-scale commercialization of the sodium ion battery.
Disclosure of Invention
The invention aims to solve the technical problems, and provides the sodium ion battery negative electrode slurry, which is used for effectively solving the problem of poor wettability of the sodium ion battery negative electrode slurry when the surface of an aluminum foil is coated with the sodium ion battery negative electrode slurry at lower cost.
The negative electrode slurry of the sodium ion battery comprises the following components in parts by weight: 90-95 parts of anode active material, 1.0-5.0 parts of binder, 1.0-5.0 parts of conductive agent and 0.5-2.0 parts of wetting agent.
After the wetting agent is added to the negative electrode slurry, the overall surface tension of the slurry can be reduced, the slurry can be uniformly spread on the surface of the aluminum foil, and the uniform coating of the slurry is ensured.
The negative electrode active material in the negative electrode slurry of the sodium ion battery is not limited, and any substance can be used as the negative electrode active material of the sodium ion battery, and the negative electrode active material is one or more of sodium, titanium, zinc, indium, tin, silicon and carbon materials.
Further, the binder is one or more of styrene-butadiene rubber emulsion-sodium carboxymethyl cellulose, polyacrylic acid, polyvinyl alcohol, polyacrylic acid, polyacrylonitrile, polyacrylate and sodium alginate.
The conductive agent in the negative electrode slurry of the sodium ion battery is not limited, and any conductive agent can be used for the sodium ion battery, and the conductive agent is one or more of carbon black, acetylene black, graphite, carbon fiber and carbon nano tube.
Further, the wetting agent is an amine compound containing hydroxyl and methyl in the structure, and is one or more of isopropanolamine, isobutolamine, diisopropanolamine, N-methyldiethanolamine, N-diethylethanolamine and phenylpropanolamine.
The methyl in the wetting agent provides electrons for nitrogen atoms, and enhances the electron donating ability of amino groups, so that the binding force of the wetting agent and the anode active material is enhanced, and the dispersion of the anode active material in a slurry system is facilitated.
Further, the sodium ion battery cathode slurry also comprises water. The hydroxyl and amino in the wetting agent can form intermolecular hydrogen bonds with solvent water, so that the compatibility and uniformity of the anode slurry system are enhanced, and the anode slurry is uniformly coated on the surface of the aluminum foil.
Further, the viscosity of the sodium ion battery cathode slurry is 1000-9000 mPas, and the solid content is 20-80%.
The sodium ion battery cathode slurry is obtained by uniformly stirring a wetting agent, an active material, a conductive agent, a binder and water.
Further, the stirring speed is 1000-9000 rpm, and the stirring time is 2-10 h.
A sodium ion battery negative electrode plate is prepared by coating the sodium ion battery negative electrode slurry on aluminum foil, drying and pressing.
Further, the thickness of the negative electrode plate of the sodium ion battery is 10-200 mu m.
Further, the drying temperature is 60-120 ℃ and the drying time is 1-10 min.
Further, the pressing pressure is 50-150 t, and the time is 1-20 s.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
(1) Amine compounds containing hydroxyl and methyl in the structure are used as wetting agents and added into the sodium ion battery negative electrode slurry, so that the problem that the coating non-uniformity is easily caused due to poor wettability of the negative electrode slurry when the surface of an aluminum foil is coated is solved with lower cost;
(2) The methyl in the wetting agent enhances the electron donating ability of the amino, thereby enhancing the acting force of the wetting agent and the anode active material and being beneficial to the dispersion of the anode active material in a slurry system;
(3) Hydroxyl and amino in the wetting agent can form intermolecular hydrogen bonds with solvent water, so that the compatibility and uniformity of a negative electrode slurry system are enhanced, and the uniform coating of the negative electrode slurry on the surface of the aluminum foil is facilitated;
(4) The wetting agent can volatilize with solvent water in the drying and baking process of the pole piece, so that the wetting agent can not remain in the pole piece and can not influence the exertion of the electrochemical performance of the pole piece;
(5) The negative electrode slurry is coated on the aluminum foil to obtain the negative electrode plate of the sodium ion battery with uniform and smooth surface, and the negative electrode plate has good electrochemical performance when used for the sodium ion battery;
(6) The method for improving the wettability of the negative electrode slurry on the surface of the aluminum foil is simple and efficient and is suitable for industrial application.
Detailed Description
The technical scheme of the present invention will be further described by the following specific examples, and it should be understood that the specific examples described herein are only for aiding in understanding the present invention, and are not intended to be limiting. Unless otherwise indicated, all materials used in the examples of the present invention are those commonly used in the art, and all methods used in the examples are those commonly used in the art.
Example 1
The preparation method of the sodium ion battery negative electrode plate comprises the following steps:
(1) Adding 95 parts of hard carbon, 1.0 part of conductive carbon black, 2.0 parts of styrene-butadiene rubber emulsion, 2.0 parts of sodium carboxymethyl cellulose and 0.9 part of isopropanolamine into 70 parts of water, and stirring at 1000-9000 rpm for 2-10 hours to prepare negative electrode slurry with the solid content of 59% and the viscosity of 5000 mPa.s;
(2) Coating the negative electrode slurry on aluminum foil, drying at 80 ℃ for 2min, and pressing for 10s under 100t pressure to obtain the negative electrode plate of the sodium ion battery, wherein the thickness is 150 mu m.
Example 2
The preparation method of the sodium ion battery negative electrode plate comprises the following steps:
(1) 93 parts of hard carbon, 1.0 part of conductive carbon black, 1.5 parts of styrene-butadiene rubber emulsion, 1.5 parts of sodium carboxymethyl cellulose and 0.8 part of N-methyldiethanolamine are added into 70 parts of water, and the mixture is stirred at 1000-9000 rpm for 2-10 hours to prepare negative electrode slurry with the solid content of 58% and the viscosity of 4950 mPa.s;
(2) Coating the negative electrode slurry on aluminum foil, drying for 4min at 80 ℃, and pressing for 10s under 100t pressure to obtain the negative electrode plate of the sodium ion battery, wherein the thickness is 150 mu m.
Example 3
The preparation method of the sodium ion battery negative electrode plate comprises the following steps:
(1) 92 parts of hard carbon, 1.0 part of conductive carbon black, 1.0 part of styrene-butadiene rubber emulsion, 1.0 part of sodium carboxymethyl cellulose and 0.6 part of phenylpropanolamine are added into 70 parts of water, and the mixture is stirred at 1000-9000 rpm for 2-10 hours to prepare negative electrode slurry with the solid content of 57% and the viscosity of 4900 mPa.s;
(2) Coating the negative electrode slurry on aluminum foil, drying at 80 ℃ for 2min, and pressing for 10s under 100t pressure to obtain the negative electrode plate of the sodium ion battery, wherein the thickness is 150 mu m.
Example 4
The preparation method of the sodium ion battery negative electrode plate comprises the following steps:
(1) Adding 95 parts of hard carbon, 1.0 part of conductive carbon black, 2.0 parts of styrene-butadiene rubber emulsion, 2.0 parts of sodium carboxymethyl cellulose and 0.9 part of diethanolamine into 70 parts of water, and stirring at 1000-9000 rpm for 2-10 hours to prepare negative electrode slurry with the solid content of 59% and the viscosity of 5000 mPa.s;
(2) Coating the negative electrode slurry on aluminum foil, drying at 80 ℃ for 2min, and pressing for 10s under 100t pressure to obtain the negative electrode plate of the sodium ion battery, wherein the thickness is 150 mu m.
Example 5
The preparation method of the sodium ion battery negative electrode plate comprises the following steps:
(1) Adding 95 parts of hard carbon, 1.0 part of conductive carbon black, 2.0 parts of styrene-butadiene rubber emulsion, 2.0 parts of sodium carboxymethyl cellulose and 0.9 part of dimethylamine into 70 parts of water, and stirring at 1000-9000 rpm for 2-10 hours to prepare negative electrode slurry with the solid content of 59% and the viscosity of 5000 mPa.s;
(2) Coating the negative electrode slurry on aluminum foil, drying at 80 ℃ for 2min, and pressing for 10s under 100t pressure to obtain the negative electrode plate of the sodium ion battery, wherein the thickness is 150 mu m.
Example 6
The preparation method of the sodium ion battery negative electrode plate comprises the following steps:
(1) Adding 95 parts of hard carbon, 1.0 part of conductive carbon black, 2.0 parts of styrene-butadiene rubber emulsion, 2.0 parts of sodium carboxymethyl cellulose and 0.9 part of ethylenediamine into 70 parts of water, and stirring at 1000-9000 rpm for 2-10 hours to prepare negative electrode slurry with the solid content of 59% and the viscosity of 5000 mPa.s;
(2) Coating the negative electrode slurry on aluminum foil, drying at 80 ℃ for 2min, and pressing for 10s under 100t pressure to obtain the negative electrode plate of the sodium ion battery, wherein the thickness is 150 mu m.
Comparative example 1
The preparation method of the negative electrode plate of the sodium ion battery of the comparative example comprises the following steps:
(1) Adding 95 parts of hard carbon, 1.0 part of conductive carbon black, 2.0 parts of styrene-butadiene rubber emulsion, 2.0 parts of sodium carboxymethyl cellulose and 0.3 part of isopropanolamine into 70 parts of water, and stirring at 1000-9000 rpm for 2-10 hours to prepare negative electrode slurry with the solid content of 59% and the viscosity of 5000 mPa.s;
(2) Coating the negative electrode slurry on aluminum foil, drying at 80 ℃ for 2min, and pressing for 10s under 100t pressure to obtain the negative electrode plate of the sodium ion battery, wherein the thickness is 150 mu m.
Comparative example 2
The preparation method of the negative electrode plate of the sodium ion battery of the comparative example comprises the following steps:
(1) Adding 95 parts of hard carbon, 1.0 part of conductive carbon black, 2.0 parts of styrene-butadiene rubber emulsion, 2.0 parts of sodium carboxymethyl cellulose and 2.5 parts of isopropanolamine into 70 parts of water, and stirring at 1000-9000 rpm for 2-10 hours to prepare negative electrode slurry with solid content of 58% and viscosity of 4950 mPa.s;
(2) Coating the negative electrode slurry on aluminum foil, drying at 80 ℃ for 2min, and pressing for 10s under 100t pressure to obtain the negative electrode plate of the sodium ion battery, wherein the thickness is 150 mu m.
By NaNiFeMnO 2 And mixing the positive electrode active material with conductive carbon black and PVDF according to the mass ratio of 95:3:2, adding NMP, stirring uniformly, preparing positive electrode slurry with the solid content of 20-80% and the viscosity of 1000-9000 mPas, coating the positive electrode slurry on aluminum foil with the thickness of 12 mu m, fully drying, and pressing to obtain the positive electrode sheet with the thickness of 100 mu m.
The positive electrode plate, the negative electrode plates obtained in the examples and the comparative examples are assembled into a 1800mAh soft package battery, the battery is formed by using a current of 0.05C in a voltage range of 1.5-4V, and then the circulation retention rate of the battery is tested by using a current of 1C, and the test results are shown in Table 1.
Table 1 table of electrochemical properties of the pouch cell
The negative electrode slurry of the sodium ion battery obtained in examples 1-3 is not shrunk, is manufactured into a negative electrode sheet for the sodium ion battery, has good electrochemical performance, the diethanolamine used in example 4 is free of methyl, the lack of methyl does not enhance the electron donating ability of amino, the acting force of a wetting agent and a negative electrode active material is weakened, the slurry is not well dispersed and the actual surface tension of the negative electrode slurry is not reduced, the obtained negative electrode slurry is partially shrunk, the electrochemical performance is reduced, the dimethylamine used in example 5 is free of hydroxyl, the intermolecular hydrogen bonds in the slurry system are reduced, the system compatibility is poor, the obtained negative electrode slurry is partially shrunk, the electrochemical performance is reduced, the ethylenediamine used in example 6 is free of hydroxyl and methyl, the intermolecular hydrogen bonds in the slurry system are reduced, the acting force of the wetting agent and the negative electrode active material is weakened, the obtained negative electrode slurry is more obvious, the electrochemical performance is poorer, a small amount of isopropanolamine is used in comparative example 1, the effect of the small amount of wetting agent on the surface tension reduction of the negative electrode slurry is limited, the obtained negative electrode slurry is partially shrunk, the excessive isopropanolamine is used in comparative example 2, the surface tension of the slurry is reduced, the residual isopropanolamine is difficult to completely dry, the residual impurities are easily introduced, and the impurities are difficult to completely reduce.
Finally, it should be noted that the specific embodiments described herein are merely illustrative of the spirit of the invention and are not limiting of the invention's embodiments. Those skilled in the art to which the invention pertains may make various modifications or additions to the described embodiments or may be substituted in a similar manner, without and without all of the embodiments herein being fully understood. While these obvious variations and modifications, which come within the spirit of the invention, are within the scope of the invention, they are to be construed as being without departing from the spirit of the invention.
Claims (10)
1. The sodium ion battery negative electrode slurry is characterized by comprising the following components in parts by weight: 90-95 parts of anode active material, 1.0-5.0 parts of binder, 1.0-5.0 parts of conductive agent and 0.5-2.0 parts of wetting agent.
2. The negative electrode slurry of sodium ion battery according to claim 1, wherein the binder is one or more of styrene-butadiene rubber emulsion-sodium carboxymethyl cellulose, polyacrylic acid, polyvinyl alcohol, polyacrylic acid, polyacrylonitrile, polyacrylate and sodium alginate.
3. The negative electrode slurry for sodium ion battery according to claim 1, wherein the wetting agent is an amine compound having a hydroxyl group and a methyl group in its structure.
4. The negative electrode slurry for sodium ion battery according to claim 1, wherein the viscosity of the negative electrode slurry for sodium ion battery is 1000 to 9000 mPa-s and the solid content is 20 to 80%.
5. The negative electrode slurry for sodium ion battery according to claim 1, wherein the negative electrode slurry for sodium ion battery is obtained by uniformly stirring a wetting agent, an active material, a conductive agent, a binder and water.
6. The negative electrode slurry for sodium ion battery according to claim 5, wherein the stirring speed is 1000 to 9000rpm for 2 to 10 hours.
7. The negative electrode plate of the sodium ion battery is characterized in that the negative electrode plate of the sodium ion battery is obtained by coating aluminum foil with the negative electrode slurry of the sodium ion battery in claim 1, drying and pressing.
8. The negative electrode tab of sodium ion battery of claim 7, wherein the negative electrode tab of sodium ion battery has a thickness of 10-200 μm.
9. The negative electrode plate of sodium ion battery according to claim 7, wherein the drying temperature is 60-120 ℃ and the time is 1-10 min.
10. The negative electrode plate of sodium ion battery according to claim 7, wherein the pressing pressure is 50-150 t for 1-20 s.
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