CN220400629U - Sodium ion battery negative plate of sodium in advance - Google Patents
Sodium ion battery negative plate of sodium in advance Download PDFInfo
- Publication number
- CN220400629U CN220400629U CN202321760619.3U CN202321760619U CN220400629U CN 220400629 U CN220400629 U CN 220400629U CN 202321760619 U CN202321760619 U CN 202321760619U CN 220400629 U CN220400629 U CN 220400629U
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- CN
- China
- Prior art keywords
- sodium
- active material
- coating
- negative electrode
- material layer
- Prior art date
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- 229910052708 sodium Inorganic materials 0.000 title claims abstract description 55
- 239000011734 sodium Substances 0.000 title claims abstract description 55
- 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 title claims abstract description 48
- 229910001415 sodium ion Inorganic materials 0.000 title claims abstract description 30
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000000576 coating method Methods 0.000 claims abstract description 64
- 239000011248 coating agent Substances 0.000 claims abstract description 63
- 239000007773 negative electrode material Substances 0.000 claims abstract description 26
- 239000010410 layer Substances 0.000 claims description 57
- 239000011149 active material Substances 0.000 claims description 24
- 239000003153 chemical reaction reagent Substances 0.000 claims description 23
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 18
- 229910052782 aluminium Inorganic materials 0.000 claims description 18
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 16
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 16
- 239000011888 foil Substances 0.000 claims description 15
- 239000011780 sodium chloride Substances 0.000 claims description 8
- 239000011775 sodium fluoride Substances 0.000 claims description 8
- 235000013024 sodium fluoride Nutrition 0.000 claims description 8
- -1 aryl sodium Chemical compound 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 239000012790 adhesive layer Substances 0.000 claims description 4
- 239000010416 ion conductor Substances 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000011889 copper foil Substances 0.000 claims description 3
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 3
- 229910021385 hard carbon Inorganic materials 0.000 claims description 3
- 238000007788 roughening Methods 0.000 claims description 3
- 229910021384 soft carbon Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 239000006183 anode active material Substances 0.000 description 17
- 238000000034 method Methods 0.000 description 13
- 239000003795 chemical substances by application Substances 0.000 description 11
- 239000002002 slurry Substances 0.000 description 6
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000003756 stirring Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000010405 anode material Substances 0.000 description 3
- 230000001351 cycling effect Effects 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 150000003388 sodium compounds Chemical class 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 125000003367 polycyclic group Chemical group 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000007761 roller coating Methods 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- OEJPCMVOWZXTDT-UHFFFAOYSA-N sodium;tetrafluoromethane Chemical compound [Na].FC(F)(F)F OEJPCMVOWZXTDT-UHFFFAOYSA-N 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Battery Electrode And Active Subsutance (AREA)
Abstract
The utility model discloses a pre-sodified sodium ion battery negative plate which comprises a negative current collector, wherein one side or two sides of the negative current collector are coated with a negative active material layer, and one side or two sides of the negative active material layer are provided with a pre-sodified coating. The sodium ion battery negative plate of the pre-sodium treatment has the characteristics of convenient processing, good pre-sodium treatment effect and strong controllability.
Description
Technical Field
The utility model relates to the technical field of sodium ion batteries, in particular to a pre-sodified sodium ion battery negative plate.
Background
In the field of sodium ion batteries, negative electrode pre-sodification refers to introducing sodium ions into the negative electrode material of a sodium ion battery to improve the performance and stability of the battery.
During the negative electrode pre-sodification process, the negative electrode material is typically treated with sodium salts or other sodium compounds. This allows a portion of sodium ions to be intercalated into the negative electrode material to form a sodium compound or sodium intercalation. The treatment can increase the adsorption capacity of the negative electrode material to sodium ions and improve the capacity and the cycling stability of the battery.
For example, chinese patent No. 109546134A discloses a sodium ion battery negative electrode pre-sodium treatment method, a negative electrode material obtained by the method and a sodium ion battery. And (3) reacting the sodium ion battery anode material with an aryl sodium solution, wherein the aryl sodium reagent is a polycyclic conjugated aryl sodium compound. The irreversible capacity existing in the first-week discharging process of the anode material can be eliminated, and the first-week coulomb efficiency of the anode is greatly improved. The method can be carried out at normal temperature, has short reaction time, simple process, controllable reaction depth, strong safety and easy industrialization. Meanwhile, the energy density and the cycling stability of the sodium ion full battery assembled by the negative electrode and the sodium storage positive electrode after the pre-sodium treatment are also greatly improved, thereby providing possibility for the practical development of a high-energy-density sodium battery system.
However, it must also be seen that in this method, the pre-sodiumized negative electrode is obtained by washing and drying the negative electrode active material after reacting with an aryl sodium solution, and the final negative electrode sheet is obtained by stirring to form a slurry, coating, and drying the slurry in the process of preparing the negative electrode sheet. In the stirring process, the pre-sodiumized negative electrode needs to be added into a large amount of deionized water and can react with the deionized water to generate sodium hydroxide, so that the loss of the pre-sodiumized reagent and the improvement of the alkalinity of the slurry are caused, the pre-sodiumization effect of the negative electrode is influenced, the stability of the slurry is reduced, and the performance of the battery is finally influenced.
Disclosure of Invention
The utility model aims to provide a sodium ion battery negative plate for pre-sodium treatment, which has the characteristics of convenient processing, good pre-sodium treatment effect and strong controllability.
The utility model can be realized by the following technical scheme:
the utility model discloses a pre-sodified sodium ion battery negative plate which comprises a negative current collector, wherein one side or two sides of the negative current collector are coated with a negative active material layer, and one side or two sides of the negative active material layer are provided with a pre-sodified coating.
Further, the anode active material layer is a multi-layer composite structure, and the multi-layer composite structure comprises a first active material layer, a second active material layer and a third active material layer, wherein a pre-sodium coating is arranged among the first active material layer, the second active material layer and the third active material layer. By arranging the pre-sodification coating in the multilayer composite structure, the contact area of the pre-sodification reagent and the anode active material is increased, and the pre-sodification effect is improved.
Further, the joint surface of the negative electrode active material layer and the pre-sodium treatment coating is a textured surface subjected to roughening treatment. By arranging the texture surface, the control operation of the coating process on the surface is simplified, and the combination capability of the pre-sodiumized coating and the anode active material layer is improved.
Further, the pre-sodium treatment coating is a liquid pre-sodium treatment reagent coating or a solid pre-sodium treatment reagent coating, and different pre-sodium treatment reagent types can be flexibly selected according to actual needs.
Further, the liquid pre-sodiumizing reagent coating is an aryl sodium reagent coating, a sodium fluoride coating or a sodium chloride coating. The sodium aryl reagent is a reagent type verified by the prior art, and sodium fluoride and sodium chloride are also traditional pre-sodium reagents, so that the cost is low.
Further, the solid pre-sodiumizing agent coating is a sodium fluoride coating, a sodium chloride coating, a sodium fluorocarbon coating or a sodium fast ion conductor coating. Sodium fluoride and sodium chloride are also traditional pre-sodium agents, and the cost is low; the sodium carbon fluoride is used as a pre-sodium treatment reagent and has the characteristics of high efficiency, selectivity and wide application: the sodium fast ion conductor is used as a pre-sodium modification reagent and has the characteristics of high ion conductivity, stable chemical property, high-temperature stability and wide electrochemical window.
Further, a conductive adhesive layer is disposed between the negative electrode current collector and the first active material layer. By arranging the conductive adhesive layer, the conductivity is ensured, and the cohesiveness is ensured.
Further, the negative current collector is an aluminum foil, a copper foil, an aluminum net or a copper net, and different current collector types can be flexibly selected according to application requirements.
Further, the anode active material in the anode active material layer is hard carbon and/or soft carbon. In practice, other graphite-like structures are also the choice of negative electrode active material.
Further, the aluminum foil is single-sided Mao Lvbo, double-sided Mao Lvbo, microporous aluminum foil, foamed aluminum foil or coated aluminum foil, and has wide sources and low cost.
The sodium ion battery negative plate pre-sodium-treated by the utility model has the following beneficial effects:
firstly, the processing is convenient, and the pre-sodiumizing reagent coating is arranged after the coating of the anode active material is finished by adopting the mode that the pre-sodiumizing reagent coating is arranged on the surface of the anode active material layer, so that the adverse effect on the pre-sodiumizing anode in the slurry stirring process is not required to be considered, and the processing process is simplified;
secondly, the pre-sodium treatment effect is good, and the pre-sodium treatment agent coating is arranged after the coating of the anode active material is finished by adopting the mode that the pre-sodium treatment agent coating is arranged on the surface of the anode active material layer, so that the loss of the pre-sodium treatment agent in the slurry dissolving and stirring process is avoided, the pre-sodium treatment agent is effectively ensured to be attached to the surface of the anode material, and the excellent pre-sodium treatment effect is achieved;
thirdly, the controllability is strong, and the adding amount of the pre-sodium modification agent attached to the surface of the anode active material can be effectively controlled by adopting a mode that the pre-sodium modification agent coating is arranged on the surface of the anode active material layer, so that the accurate control of the pre-sodium modification agent is realized, and the consistency of the performance is improved.
Drawings
FIG. 1 is a schematic structural diagram of a pre-sodified sodium ion battery negative electrode sheet with a negative electrode active material layer coated on one side;
FIG. 2 is a schematic diagram of the structure of a pre-sodified sodium ion battery negative plate with a negative electrode active material layer coated on both sides;
the labels in the drawings include: 100. a negative electrode current collector; 200. pre-sodifying the coating; 300. a negative electrode active material layer.
Detailed Description
In order to make the technical solution of the present utility model better understood by those skilled in the art, the following further details of the present utility model will be described with reference to examples and drawings.
As shown in fig. 1-2, the utility model discloses a sodium ion battery negative plate which comprises a negative current collector 100, wherein one side or two sides of the negative current collector 100 are coated with a negative active material layer 300, and one side or two sides of the negative active material layer 300 are provided with a sodium pretreatment coating 200. Fig. 1 shows an embodiment in which one side is coated with a negative electrode active material layer, and fig. 2 shows an embodiment in which both sides are coated with a negative electrode active material layer. Wherein fig. 1 and 2 each show an embodiment when the face is coated with a pre-sodiumized coating, and fig. 2 also shows an embodiment when the face is coated with a pre-sodiumized coating.
In the utility model, in order to ensure sufficient contact of the pre-sodium treatment, the anode active material layer is a multi-layer composite structure comprising a first active material layer, a second active material layer and a third active material layer, and a pre-sodium treatment coating is arranged among the first active material layer, the second active material layer and the third active material layer.
In the present utility model, in order to secure the contact tightness, the anode active material layer and the pre-sodized coating layer are bonded to be textured surfaces subjected to roughening treatment.
In the utility model, the pre-sodiumizing coating has larger selection space in type, and the pre-sodiumizing coating is a liquid pre-sodiumizing agent coating or a solid pre-sodiumizing agent coating. Specifically, the liquid pre-sodiumizing reagent coating is an aryl sodium reagent coating, a sodium fluoride coating or a sodium chloride coating; the solid pre-sodium treatment reagent coating is a sodium fluoride coating, a sodium chloride coating, a sodium fluorocarbon coating or a sodium fast ion conductor coating.
In the utility model, in order to effectively ensure the reliability of the combination, a conductive adhesive layer is arranged between the negative electrode current collector and the first active material layer.
The negative current collector has better universality compared with the prior art in the selection of the negative current collector, and the negative current collector is an aluminum foil, a copper foil, an aluminum net or a copper net. Specifically, the aluminum foil is a single-sided Mao Lvbo, double-sided Mao Lvbo, microporous aluminum foil, foamed aluminum foil, or coated aluminum foil.
In the utility model, the anode active material has better universality compared with the prior art, and the anode active material in the anode active material layer is hard carbon and/or soft carbon.
For the present utility model, the specific manufacturing process is as follows: the negative electrode current collector is now coated with a conductive paste layer, then with a pre-sodiumized coating, and then with a negative electrode active material layer. If the anode active material layer is of a multi-layer composite structure, the first active material layer, the second active material layer, the third active material layer and the pre-sodium treatment coating are arranged at intervals. In a specific coating mode, the method can be performed by adopting a roller coating mode, a blade coating mode or a spraying mode.
Further, the foregoing embodiments are merely specific examples of the present utility model, which are described in greater detail and are not to be construed as limiting the scope of the utility model. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the spirit of the utility model, and that these obvious alternatives fall within the scope of the utility model.
Claims (9)
1. The sodium ion battery negative plate of a kind of pre-sodium, including the negative pole current collector, its characteristic lies in: one or two sides of the negative electrode current collector are coated with a negative electrode active material layer, and one or two sides of the negative electrode active material layer are provided with a pre-sodium treatment coating; the negative electrode active material layer is of a multi-layer composite structure, the multi-layer composite structure comprises a first active material layer, a second active material layer and a third active material layer, and a pre-sodium coating is arranged among the first active material layer, the second active material layer and the third active material layer.
2. The pre-sodified sodium ion battery negative electrode sheet of claim 1, wherein: the joint surface of the negative electrode active material layer and the pre-sodium treatment coating is a textured structure surface subjected to roughening treatment.
3. The pre-sodified sodium ion battery negative electrode sheet of claim 2, wherein: the pre-sodiumizing coating is a liquid pre-sodiumizing reagent coating or a solid pre-sodiumizing reagent coating.
4. The pre-sodified sodium ion battery negative electrode sheet of claim 3, wherein: the liquid pre-sodiumizing reagent coating is an aryl sodium reagent coating, a sodium fluoride coating or a sodium chloride coating.
5. The pre-sodified sodium ion battery negative electrode sheet of claim 3, wherein: the solid pre-sodium reagent coating is a sodium fluoride coating, a sodium chloride coating, a sodium fluorocarbon coating or a sodium fast ion conductor coating.
6. The pre-sodified sodium ion battery negative electrode sheet of claim 4 or 5, wherein: and a conductive adhesive layer is arranged between the negative electrode current collector and the first active material layer.
7. The pre-sodified sodium ion battery negative electrode sheet of claim 6, wherein: the negative current collector is an aluminum foil, a copper foil, an aluminum net or a copper net.
8. The pre-sodified sodium ion battery negative electrode sheet of claim 7, wherein: the negative electrode active material in the negative electrode active material layer is hard carbon and/or soft carbon.
9. The pre-sodified sodium ion battery negative electrode sheet of claim 8, wherein: the aluminum foil is single-sided Mao Lvbo, double-sided Mao Lvbo, microporous aluminum foil, foamed aluminum foil or coated aluminum foil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321760619.3U CN220400629U (en) | 2023-07-05 | 2023-07-05 | Sodium ion battery negative plate of sodium in advance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321760619.3U CN220400629U (en) | 2023-07-05 | 2023-07-05 | Sodium ion battery negative plate of sodium in advance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220400629U true CN220400629U (en) | 2024-01-26 |
Family
ID=89597623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321760619.3U Active CN220400629U (en) | 2023-07-05 | 2023-07-05 | Sodium ion battery negative plate of sodium in advance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220400629U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117727948A (en) * | 2024-02-07 | 2024-03-19 | 深圳海辰储能科技有限公司 | Negative current collector, preparation method thereof, sodium secondary battery and electric equipment |
-
2023
- 2023-07-05 CN CN202321760619.3U patent/CN220400629U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117727948A (en) * | 2024-02-07 | 2024-03-19 | 深圳海辰储能科技有限公司 | Negative current collector, preparation method thereof, sodium secondary battery and electric equipment |
| CN117727948B (en) * | 2024-02-07 | 2024-05-14 | 深圳海辰储能科技有限公司 | Negative current collector, preparation method thereof, sodium secondary battery and electric equipment |
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