CN114149319A - Organic sodium supplement additive, positive pole piece and application in sodium ion battery - Google Patents

Organic sodium supplement additive, positive pole piece and application in sodium ion battery Download PDF

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CN114149319A
CN114149319A CN202111493113.6A CN202111493113A CN114149319A CN 114149319 A CN114149319 A CN 114149319A CN 202111493113 A CN202111493113 A CN 202111493113A CN 114149319 A CN114149319 A CN 114149319A
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sodium
pole piece
ion battery
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金婷
沈超
谢科予
张涛
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Northwestern Polytechnical University
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    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C59/00—Compounds having carboxyl groups bound to acyclic carbon atoms and containing any of the groups OH, O—metal, —CHO, keto, ether, groups, groups, or groups
    • C07C59/01—Saturated compounds having only one carboxyl group and containing hydroxy or O-metal groups
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/60—Selection of substances as active materials, active masses, active liquids of organic compounds
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract

The invention relates to the technical field of sodium ion batteries, in particular to an organic sodium supplement additive, a positive pole piece and application in a sodium ion battery. The organic sodium supplement additive is a chain organic compound, and the chemical formula of the chain organic compound is CmH2m‑7Na3O7(m.gtoreq.4). The invention aims toThe organic sodium supplement additive is adopted to prepare the positive pole piece, and the positive pole piece is applied to the sodium ion battery, so that the irreversible sodium ion loss caused by the formation of a solid electrolyte interface film or the occurrence of side reaction in the formation process of the sodium ion battery is compensated, the actual capacity of the whole battery is improved, and the cycle life and the energy density of the sodium ion battery are improved.

Description

Organic sodium supplement additive, positive pole piece and application in sodium ion battery
Technical Field
The invention relates to the technical field of sodium ion batteries, in particular to an organic sodium supplement additive, a positive pole piece and application in a sodium ion battery.
Background
Energy and environmental problems are major challenges facing human beings currently, the occupation ratio of renewable energy sources is bound to be increased continuously in the future along with the proposition of a carbon neutralization target, and the development of an energy storage technology is a necessary route for accelerating the permeation of the renewable energy sources and has important strategic significance. Among a plurality of energy storage technologies, electrochemical energy storage is the category with the fastest growth and expansion due to the characteristics of wide application scenes, excellent comprehensive performance and the like. The lithium ion battery has the advantages of high energy density, no memory effect, portability, environmental friendliness and the like, is an absolute main force in electrochemical energy storage, and is rapidly developed in the fields of electric vehicles, power grid energy storage, household energy storage and the like in recent years. However, the abundance of lithium resources in the earth crust is low and uneven distribution, so that the lithium ion battery is difficult to meet the increasing energy storage requirement, so that the development of a secondary battery with low cost is imperative, the sodium ion battery has similar working principle with the lithium ion battery, abundant content in the nature and high safety, and has wide application prospect in the field of energy storage.
The working principle of the sodium ion battery is similar to that of the lithium ion battery; it is worth noting that graphite cathodes commonly used in lithium ion batteries can hardly store sodium in sodium ion battery ester electrolytes due to size, thermodynamics and other problems. At present, hard carbon is one of the most excellent negative electrode materials in sodium ion batteries due to its characteristics of stable structure, high conductivity, high sodium storage capacity and the like, and is most likely to be applied industrially, however, due to the reasons of more defects, large specific surface area and the like of hard carbon, SEI (electrode electrolyte interface) formation and interface side reaction thereof are accompanied by more serious irreversible loss of sodium ions, which directly affect the energy density and cycle life of the sodium ion batteries, especially the overall sodium ion batteries, and researchers compensate for the irreversible loss of sodium ions through various sodium supplement technologies.
The current sodium supplement technology is mainly divided into positive sodium supplement and negative sodium supplement; the negative sodium supplement mainly comprises an electrochemical sodium pre-treatment method (firstly assembling a sodium ion half cell, then disassembling the cell and taking out the negative electrode to assemble a full cell with a corresponding positive electrode material), a direct contact method (through an internal short circuit method, the electrode material is directly contacted with sodium metal in the presence of electrolyte to supplement sodium), and a direct sodium supplement method (the negative electrode material is directly mixed with sodium powder, sodium-containing organic matters (such as sodium naphthalene and sodium biphenyl) and the like); the conventional negative electrode sodium supplement method has the problems of complex operation, higher cost, certain potential safety hazard and the like, and is difficult to apply to large-scale industrial production. The method for supplementing sodium to the anode mainly comprises two methods, namely a sodium-rich anode (the purpose of supplementing sodium is achieved after sodium-rich phase is formed after metal sodium reacts with anode materials) and a sodium supplement additive (sodium ions are provided by decomposing the additive in the first charging process for sodium supplement), wherein the sodium supplement additive is complex to operate, is related to synthesis of new materials, is difficult to implement industrial production and application, and the method for adding the sodium supplement additive to the anode has the advantages of wide application range, simplicity in operation and better large-scale application prospect.
At present, the organic sodium supplement additive is mainly inorganic matter and comprises NaN3、Na3P、NaNO3、NaCrO2、Na2CO3And the like. However, these sodium supplements have certain problems, such as: NaN3And Na3P has toxicity and safety problems (j. martinez De Ilarduya, l. otaegui, j.m. l. pez del Amo, m. armand, g.singh, Journal of power Sources 2017,337,197.); na (Na)2NiO2Sensitive to air, needs to be stored in the drying chamber and the subsequent production of products reduces the energy density of the cell (k.park, b. — c.yu, j.b. goodenough, Chemistry of materials 2015,27, 6682.); NaCrO2Has toxicity and low sodium supplement capacity; na (Na)2CO3The sodium supplement capacity is only 20% of the theoretical capacity, the sodium utilization rate is low, and oxygen can be released to cause potential safety hazards to the battery; besides, some organic substances with benzene rings can also be used as positive sodium supplement agents, such as: patent CN201811420710.4 disclosesThe sodium supplementing agent is a compound with a sodium phenolate structure, has high toxicity and low sodium supplementing efficiency, and the residual organic benzene ring part is dissolved in electrolyte after sodium removal, so that the performance of a battery is negatively influenced.
In view of the above, there is a need for an organic sodium supplement additive and an application thereof, which is safe and environmentally friendly, has high sodium supplement capacity, is suitable for large-scale industrial production, and does not adversely affect the performance of the anode material body or the battery.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an organic sodium supplement additive, a positive pole piece and application in a sodium ion battery, and aims to provide the organic sodium supplement additive.
In order to achieve the purpose, the technical scheme of the invention is as follows:
an organic sodium supplement additive is a chain organic compound, and the chemical formula of the chain organic compound is CmH2m-7Na3O7(m≥4)。
Preferably, the chain organic compound has a structural formula:
Figure BDA0003399149700000031
Figure BDA0003399149700000032
wherein R is selected from alkyl with 1-6 carbon atoms.
The invention also protects a positive pole piece prepared by the organic sodium supplement additive, and the positive pole piece is prepared according to the following steps:
after dry-mixing the positive electrode active material, the organic sodium supplement additive, the conductive additive I and the positive electrode binder, adding the mixture into a solvent I to prepare slurry, uniformly coating the slurry on a current collector I, and then drying;
wherein the mass of the organic sodium supplement additive is 5-40% of the total mass of the positive electrode active material, the conductive additive I and the positive electrode binder.
Preferably, the positive electrode active material is selected from one or more of transition metal layered oxide, polyanion compound, prussian blue analogue, sodium-containing organic compound, and the positive electrode active material includes but is not limited to: NaNiO2、Na0.67(NixMnyTi1-x-y)O2(0<x<1,0<y<1)、NaMnO2、Na3V2(PO4)3、Na3V2O2(PO4)2F、Na2Fe2(SO4)3、Na2C6H2O4A mixture of one or more of them.
The invention also protects the application of the positive pole piece in the preparation of the sodium-ion battery, and the sodium-ion battery is prepared according to the following steps:
preparing a positive pole piece: cutting the positive pole piece;
preparing a negative pole piece: after being dry-mixed, the negative active material, the conductive additive II and the negative binder are added into the solvent II to prepare slurry, the slurry is uniformly coated on the current collector II, and then the slurry is dried to obtain a negative pole piece and cut;
preparing an electrolyte: dissolving sodium salt in an organic solvent to obtain an electrolyte, wherein the concentration of the electrolyte is as follows: 0.5-3 mol/L;
preparing a sodium ion battery: and sequentially assembling the positive pole piece, the diaphragm, the electrolyte and the negative pole piece, and preparing the sodium-ion battery through formation and standing processes.
Preferably, the negative active material is selected from one or more of carbon-based materials, alloy reaction materials, and conversion reaction materials, and includes, but is not limited to: hard carbon, graphite, graphene, carbon nanotube, Sn, Sb, Ge, SnO2、Sb2O3、CuO、Fe2O3、SnS2、MoS2、NaTi2(PO4)3A mixture of one or more of (a).
Preferably, the sodium salt in the electrolyte is selected from NaClO4、NaPF6A mixture of one or more of NaOTF, naffsi; the organic solvent is selected from one or more of Ethylene Carbonate (EC), Propylene Carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), fluoroethylene carbonate (FEC), ethylene glycol dimethyl ether (DME), ethylene glycol dimethyl ether (DEGDME), triethylene glycol dimethyl ether (TEGDME) and diethylene glycol dimethyl ether.
Preferably, the conductive additive I and the conductive additive II are both selected from one or more of carbon black, carbon nano tubes, acetylene black, Ketjen black, graphene and ordered mesoporous carbon CMK-3;
the positive binder and the negative binder are respectively selected from one or more of polyvinylidene fluoride, carboxymethyl cellulose, styrene-butadiene rubber, polyacrylic acid, polytetrafluoroethylene and polyvinyl alcohol;
the current collector I and the current collector II are both selected from aluminum foil or copper foil;
the solvent I and the solvent II are both selected from deionized water or N-methyl pyrrolidone.
Preferably, the mass ratio of the positive electrode active material, the conductive additive I and the positive electrode binder is 70-95: 5-20: 5-20 parts of; the mass ratio of the negative electrode active material to the conductive additive II to the negative electrode binder is 70-95: 5-20: 5-20.
Preferably, the capacity ratio of the negative pole piece of the sodium-ion battery to the positive pole piece of the sodium-ion battery is 1-1.3: 1.
Compared with the prior art, the invention has the beneficial effects that:
1. the sodium ion battery positive electrode sodium supplement additive provided by the invention is a chain organic compound containing sodium, carbon and hydrogen, and can provide additional sodium ions in the first-cycle charging process to compensate the formation of SEI film and the loss of the sodium ions in the side reaction process, according to the koble reaction principleSuch organic compounds produce CO upon decomposition of sodium ions2Gas, CO2The gas can be pumped away in the formation stage of the battery, and hydrocarbon-containing hydrocarbon compounds left after the reaction have no electrochemical reactivity and are insoluble in the electrolyte, so that the performance of the battery is not negatively influenced.
2. The additive provided by the invention is cheap and easy to obtain, is suitable for large-batch production, and has a great scale application prospect.
Drawings
FIG. 1 shows sodium citrate (C) as an organic sodium supplement additive in comparative example 3 of the present invention6H5Na3O7) A charge-discharge curve of the sodium-ion half-cell assembled as a positive electrode active material;
fig. 2 is a charge-discharge curve of a sodium-ion half-cell assembled by the positive electrode plate prepared in example 1 of the present invention;
FIG. 3 is a charge-discharge curve of a sodium-ion half-cell assembled with a positive electrode plate obtained in example 2 of the present invention;
FIG. 4 is a charge-discharge curve of a sodium-ion half-cell assembled with a positive electrode plate obtained in example 3 of the present invention;
fig. 5 is a charge-discharge curve of a sodium-ion half-cell assembled by the positive electrode plate prepared in example 4 of the present invention;
FIG. 6 is a charge-discharge curve of a sodium-ion half-cell assembled with a positive electrode plate obtained in example 5 of the present invention;
fig. 7 is a charge-discharge curve of a sodium-ion half-cell assembled by the positive electrode plate prepared in example 6 of the present invention;
FIG. 8 is a charge-discharge curve of a sodium-ion half-cell assembled from the positive electrode plate prepared in comparative example 1 of the present invention;
FIG. 9 is a charge-discharge curve of a sodium-ion half-cell assembled from positive electrode plates prepared in comparative example 2 according to the present invention;
FIG. 10 shows an organic sodium supplement additive C of the present invention6H5Na3O7XRD spectrum of (1).
Detailed Description
The following detailed description of specific embodiments of the invention is provided, but it should be understood that the scope of the invention is not limited to the specific embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. The experimental methods described in the examples of the present invention are all conventional methods unless otherwise specified.
Example 1
A preparation method of a sodium ion battery positive pole piece containing an organic sodium supplement additive comprises the following steps:
adding Na as a positive electrode material0.67Ni0.33Mn0.33Ti0.33O2Organic sodium supplement additive C6H5Na3O7The conductive agent is conductive carbon black, and the binder is polyvinylidene fluoride (PVDF) according to the weight ratio of 70: 10: 10: 10, weighing and uniformly mixing the materials, dissolving the materials in a solvent N-methylpyrrolidone (NMP), stirring the mixture to obtain uniform slurry, uniformly coating the slurry on an aluminum foil by using a scraper of 100 mu m, drying and slicing the aluminum foil to obtain the positive pole piece containing the organic sodium supplement additive.
Example 2
A preparation method of a sodium ion battery positive pole piece containing an organic sodium supplement additive comprises the following steps:
the preparation method of the positive pole piece of the sodium-ion battery adopting the organic sodium supplement additive for sodium supplement is the same as the preparation steps of the example 1, and the difference is only that the positive pole material Na0.67Ni0.33Mn0.33Ti0.33O2Organic sodium supplement additive C6H5Na3O7The weight ratio of the conductive agent, the conductive carbon black and the binder, namely polyvinylidene fluoride (PVDF), is 70: 10: 10: 10 is replaced by 60: 20: 10: 10.
example 3
A preparation method of a sodium ion battery positive pole piece containing an organic sodium supplement additive comprises the following steps:
preparation method of sodium ion battery positive pole piece adopting organic sodium supplement additive for sodium supplement, andexample 1 was prepared in the same manner except that the positive electrode material Na was used0.67Ni0.33Mn0.33Ti0.33O2Organic sodium supplement additive C6H5Na3O7The weight ratio of the conductive agent, the conductive carbon black and the binder, namely polyvinylidene fluoride (PVDF), is 70: 10: 10: 10 is replaced by 50: 30: 10: 10.
example 4
A preparation method of a sodium ion battery positive pole piece containing an organic sodium supplement additive comprises the following steps:
the preparation method of the positive pole piece of the sodium-ion battery adopting the organic sodium supplement additive to supplement sodium is the same as the preparation steps of the embodiment 1, and the difference is only that the positive pole material is Na0.67Ni0.33Mn0.33Ti0.33O2Substitution to Na3V2(PO4)3。
Example 5
A preparation method of a sodium ion battery positive pole piece containing an organic sodium supplement additive comprises the following steps:
the preparation method of the positive pole piece of the sodium-ion battery adopting the organic sodium supplement additive for sodium supplement is the same as the preparation steps of the embodiment 4, and the difference is only that the positive pole material Na3V2(PO4)3Organic sodium supplement additive C6H5Na3O7The weight ratio of the conductive agent, the conductive carbon black and the binder, namely polyvinylidene fluoride (PVDF), is 70: 10: 10: 10 is replaced by 60: 20: 10: 10.
example 6
A preparation method of a sodium ion battery positive pole piece containing an organic sodium supplement additive comprises the following steps:
the preparation method of the positive pole piece of the sodium-ion battery adopting the organic sodium supplement additive for sodium supplement is the same as the preparation steps of the embodiment 4, and the difference is only that the positive pole material Na3V2(PO4)3Organic sodium supplement additive C6H5Na3O7Conductive carbon black as conductive agent and adhesive agentThe weight ratio of vinylidene fluoride (PVDF) is 70: 10: 10: 10 is replaced by 50: 30: 10: 10.
comparative example 1
The positive electrode material, positive electrode Na0.67Ni0.33Mn0.33Ti0.33O2Conductive carbon black as a conductive agent and polyvinylidene fluoride (PVDF) as a binder in a weight ratio of 80: 10: 10, uniformly mixing, dissolving in a solvent N-methyl pyrrolidone (NMP), stirring to obtain uniform slurry, uniformly coating the slurry on an aluminum foil by using a scraper of 100 mu m, drying, and slicing to obtain the positive pole piece.
Comparative example 2
The positive electrode material, positive electrode Na3V2(PO4)3Conductive carbon black as a conductive agent and polyvinylidene fluoride (PVDF) as a binder in a weight ratio of 80: 10: 10, uniformly mixing, dissolving in a solvent N-methyl pyrrolidone (NMP), stirring to obtain uniform slurry, uniformly coating the slurry on an aluminum foil by using a scraper of 100 mu m, drying, and slicing to obtain the positive pole piece.
Comparative example 3
Adding organic sodium supplement additive C6H5Na3O7The conductive agent, the conductive carbon black and the binder polyvinylidene fluoride (PVDF) are 80: 10: 10, weighing and uniformly mixing the components, dissolving the components in a solvent N-methylpyrrolidone (NMP), stirring the mixture to obtain uniform slurry, uniformly coating the slurry on an aluminum foil by using a scraper of 100 mu m, drying and slicing the aluminum foil to obtain a positive electrode piece taking an organic sodium supplement additive as a positive electrode material, and exploring the electrochemical behavior of the positive electrode piece in the sodium supplement process.
Test results and discussion
And (3) electrochemical performance testing: the pole pieces obtained in the examples 1 to 6 and the comparative examples 1 to 3 are taken as positive pole pieces, the metal sodium piece is taken as a negative pole piece, the glass fiber is taken as a diaphragm, and 1mol/L NaClO4(PC + 5% FEC) is used as electrolyte, and the button cell is assembled together; the sodium ions of the examples and comparative examples of the present invention were tested by performing charge and discharge cycles at a current density of 20mA/g in a voltage interval of 2.0 to 4.4V for examples 1 to 3, comparative example 1 and comparative example 3, and a voltage interval of 2.0 to 4.5V for examples 4 to 6 and comparative example 2Electrochemical performance of the cell, the results are shown in table 1:
TABLE 1
Battery numbering First turn charge capacity (mAh/g) Data source
Example 1 155.5 FIG. 1 shows a schematic view of a
Example 2 172.5 FIG. 2
Example 3 205.5 FIG. 3
Example 4 136.4 FIG. 4
Example 5 170.3 FIG. 5
Example 6 213.5 FIG. 6
Comparative example 1 123 FIG. 7
Comparative example 2 122 FIG. 8
Comparative example 3 281 FIG. 9
As can be seen from the test results of comparative example 3 of table 1: organic sodium supplement sodium citrate (C)6H5Na3O7) Can contribute about 281mAh/g of capacity, has high sodium supplement capacity and proper electrochemical reaction potential. From the test results of the half-cells of examples 1 to 6 it can be seen that: after the organic sodium supplement additive supplements sodium for the sodium ion battery, the first-circle charging capacity of the sodium ion battery is obviously improved, which shows that the organic sodium supplement additive can provide additional sodium ions to compensate the sodium ion loss in the SEI film formation and side reaction process in the first-circle charging process of the battery, has obvious effect on improving the energy density and the cycle stability of the sodium ion battery, and has great application value in the industrial production application of the sodium ion battery.
Comparative example 3 is a battery assembled by using sodium citrate as a sodium supplement additive as a positive active material, and aims to illustrate that the sodium citrate has the function of supplementing sodium.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. The organic sodium supplement additive is characterized in that the organic sodium supplement additive is in a chain shapeAn organic compound having a chemical formula of CmH2m-7Na3O7(m≥4)。
2. The organic sodium supplement additive according to claim 1, wherein the chain organic compound has a structural formula:
Figure FDA0003399149690000011
wherein R is selected from alkyl with 1-6 carbon atoms.
3. A positive pole piece prepared by using the organic sodium supplement additive of any one of claims 1-2, wherein the positive pole piece is prepared according to the following steps:
after dry-mixing the positive electrode active material, the organic sodium supplement additive, the conductive additive I and the positive electrode binder, adding the mixture into a solvent I to prepare slurry, uniformly coating the slurry on a current collector I, and then drying;
wherein the mass of the organic sodium supplement additive is 5-40% of the total mass of the positive electrode active material, the conductive additive I and the positive electrode binder.
4. The positive electrode plate as claimed in claim 3, wherein the positive active material is selected from one or more of transition metal layered oxide, polyanion compound, Prussian blue analogue, and sodium-containing organic compound.
5. The application of the positive pole piece in the preparation of the sodium-ion battery according to claim 4, wherein the sodium-ion battery is prepared according to the following steps:
preparing a positive pole piece: cutting the positive pole piece;
preparing a negative pole piece: after being dry-mixed, the negative active material, the conductive additive II and the negative binder are added into the solvent II to prepare slurry, the slurry is uniformly coated on the current collector II, and then the slurry is dried to obtain a negative pole piece and cut;
preparing an electrolyte: dissolving sodium salt in an organic solvent to obtain an electrolyte, wherein the concentration of the electrolyte is as follows: 0.5-3 mol/L;
preparing a sodium ion battery: and sequentially assembling the positive pole piece, the diaphragm, the electrolyte and the negative pole piece, and preparing the sodium-ion battery through formation and standing processes.
6. The application of the positive pole piece in the preparation of the sodium-ion battery according to claim 5, wherein the negative active material is selected from one or more of carbon-based materials, alloy reaction materials and conversion reaction materials.
7. The application of the positive pole piece in the preparation of the sodium-ion battery according to claim 5, wherein the sodium salt in the electrolyte is selected from NaClO4、NaPF6A mixture of one or more of NaOTF, naffsi; the organic solvent is selected from one or more of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, fluoroethylene carbonate, ethylene glycol dimethyl ether, triethylene glycol dimethyl ether and diethylene glycol dimethyl ether.
8. The application of the positive pole piece in the preparation of the sodium-ion battery according to claim 5, wherein the conductive additive I and the conductive additive II are both selected from one or more of carbon black, carbon nanotubes, acetylene black, Ketjen black, graphene and ordered mesoporous carbon CMK-3;
the positive binder and the negative binder are respectively selected from one or more of polyvinylidene fluoride, carboxymethyl cellulose, styrene-butadiene rubber, polyacrylic acid, polytetrafluoroethylene and polyvinyl alcohol;
the current collector I and the current collector II are both selected from aluminum foil or copper foil;
the solvent I and the solvent II are both selected from deionized water or N-methyl pyrrolidone.
9. The application of the positive pole piece in the preparation of the sodium-ion battery according to claim 5, wherein the mass ratio of the positive active material to the conductive additive I to the positive binder is 70-95: 5-20: 5-20 parts of; the mass ratio of the negative electrode active material to the conductive additive II to the negative electrode binder is 70-95: 5-20: 5-20.
10. The application of the positive pole piece in the preparation of the sodium-ion battery according to claim 5, wherein the capacity ratio of the negative pole piece of the sodium-ion battery to the positive pole piece of the sodium-ion battery is 1-1.3: 1.
CN202111493113.6A 2021-12-08 2021-12-08 Organic sodium supplement additive, positive pole piece and application in sodium ion battery Pending CN114149319A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
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CN114865087A (en) * 2022-06-02 2022-08-05 大连中比动力电池有限公司 Electrolyte for sodium ion battery
CN114865087B (en) * 2022-06-02 2024-03-08 南京比飞达新能源科技有限公司 Electrolyte for sodium ion battery
CN115084433A (en) * 2022-06-23 2022-09-20 蜂巢能源科技股份有限公司 Positive pole piece and sodium ion battery
CN115472784A (en) * 2022-08-16 2022-12-13 北京航空航天大学 Na 3 Ti 2 (PO 4 ) 3 Preparation method of positive electrode and application of positive electrode in sodium ion battery
CN115676796A (en) * 2022-11-08 2023-02-03 西北大学 Monoclinic-phase vanadium sodium oxygen pyrophosphate, preparation method thereof and application thereof in sodium-ion battery
CN115676796B (en) * 2022-11-08 2024-04-16 西北大学 Monoclinic-phase sodium vanadyl pyrophosphate, preparation method thereof and application thereof in sodium ion battery
CN116780003A (en) * 2023-08-21 2023-09-19 深圳海辰储能控制技术有限公司 Positive plate, method for determining uniform distribution of sodium supplementing particles and energy storage device
CN116799336A (en) * 2023-08-21 2023-09-22 深圳海辰储能控制技术有限公司 Positive plate, method for determining uniform distribution of sodium supplementing particles and energy storage device
CN116799336B (en) * 2023-08-21 2024-01-26 深圳海辰储能控制技术有限公司 Positive plate, method for determining uniform distribution of sodium supplementing particles and energy storage device
CN116780003B (en) * 2023-08-21 2024-01-26 深圳海辰储能控制技术有限公司 Positive plate, method for determining uniform distribution of sodium supplementing particles and energy storage device

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