CN110911746B - Two-dimensional nano-structure electrolyte additive, preparation method and application - Google Patents
Two-dimensional nano-structure electrolyte additive, preparation method and application Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0567—Liquid materials characterised by the additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention belongs to the technical field of alkali metal battery electrolyte, and particularly discloses a two-dimensional nano-structure electrolyte additive, a preparation method and application. The two-dimensional nanostructured electrolyte additive is a two-dimensional structured organic or inorganic nanosheet, the two-dimensional nanostructured material is one or more of a boron nitride nanosheet, a graphene oxide, a transition metal sulfide nanosheet, a two-dimensional metal organic framework material and a two-dimensional covalent organic framework material, and the thickness of the two-dimensional nanostructured material is not more than 10 nanometers. The method comprises the steps of stripping an organic or inorganic bulk material into two-dimensional nanosheets with the thickness of less than 10 nanometers, adding the two-dimensional nanosheets into deionized water, uniformly dispersing, and freeze-drying to obtain the electrolyte additive with the two-dimensional nanostructure. The electrolyte comprises electrolyte salt, a non-aqueous organic solvent and the two-dimensional nano-structure electrolyte additive. The invention can improve the long-term cycling stability and safety of the battery.
Description
Technical Field
The invention belongs to the technical field of alkali metal battery electrolyte, and particularly relates to a two-dimensional nano-structure electrolyte additive, a preparation method and application.
Background
The lithium ion battery is one of the most popular secondary batteries in the current commercial batteries, however, the current commercial lithium ion battery is close to the theoretical energy density and cannot meet the high energy density energy storage requirements of electric vehicles, power grids and the like. Compared with the common lithium ion battery, the alkali metal battery adopting the alkali metal simple substance as the cathode has extremely high theoretical capacity, but the alkali metal has very high reaction activity and can continuously react with the electrolyte, so that the loss of the electrolyte, the growth of dendrite and the short circuit of the battery are caused. Suitable electrolyte additives help to reduce side reactions of the alkali metal and passivate its surface, thereby limiting further reaction of the alkali metal negative electrode with the electrolyte and extending the cycle life of the alkali metal battery. However, the electrolyte additives in the prior art are continuously consumed during the alkali metal deposition/stripping process, resulting in a decrease in the concentration of the additives and failure to satisfy long-term stability.
Therefore, there is a need to develop a non-reactive additive that is permanently present in the battery and maintains its concentration substantially constant, improving the safety of the battery over its life cycle.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides a two-dimensional nano-structure electrolyte additive, a preparation method and application, the two-dimensional nano-structure electrolyte additive has high strength and certain flexibility, and the thickness of the additive is not more than 10 nanometers, when the additive forms uniform colloid in the electrolyte, which can mechanically suppress the growth of dendrites of the electrolyte, enhance the interfacial stability of the electrode/electrolyte, and further, alkali metal ions or electrolyte salt anions can interact with the two-dimensional nanostructured electrolyte additive through electrostatic or van der waals forces, thereby improving the conductivity and ion migration number of the electrolyte and promoting the uniform deposition of alkali metal ions, and is particularly suitable for the additive in the electrolyte of the non-aqueous alkali metal battery.
To achieve the above object, according to one aspect of the present invention, a two-dimensional nanostructured electrolyte additive is provided, the two-dimensional nanostructured electrolyte additive is a two-dimensional structured organic or inorganic nanosheet, the two-dimensional structured organic or inorganic nanosheet includes a two-dimensional nanostructured material, the two-dimensional nanostructured material is one or more of a boron nitride nanosheet, a graphene oxide, a transition metal sulfide nanosheet, a two-dimensional metal organic framework material, and a two-dimensional covalent organic framework material, and the thickness of the two-dimensional structured organic or inorganic nanosheet is not greater than 10 nm.
As a further preference, the two-dimensional nanostructured electrolyte additive can form a homogeneous colloid in the non-aqueous alkali metal battery electrolyte.
According to another aspect of the present invention, there is also provided a method for preparing a two-dimensional nanostructured electrolyte additive comprising the steps of:
(1) stripping organic or inorganic bulk materials into two-dimensional nanosheets with a thickness of less than 10 nanometers by adopting a ball milling, ultrasonic dispersion or chemical method;
(2) and adding the two-dimensional nanosheets into deionized water for uniform dispersion to obtain a two-dimensional nanosheet dispersion, and freeze-drying the two-dimensional nanosheet dispersion to obtain the two-dimensional nanostructured electrolyte additive.
More preferably, in the step (1), the ball milling time is 10-20 h; the ultrasonic dispersion time is 1-10 h; the dispersant used for ultrasonic dispersion is one or more of water, ethanol, isopropanol, N-dimethylformamide and N-methylpyrrolidone.
More preferably, in the step (2), the two-dimensional nanosheet dispersion is subjected to vacuum filtration before freeze-drying.
According to another aspect of the invention there is also provided a non-aqueous alkali metal battery electrolyte comprising an electrolyte salt, a non-aqueous organic solvent, the two-dimensional nanostructured electrolyte additive of claim 1.
More preferably, the mass fraction of the two-dimensional nanostructure electrolyte additive in the nonaqueous alkali metal battery electrolyte is 0.05-10%.
More preferably, the electrolyte salt is LiTFSI, LiFSI, LiPF6、LiBF4、LiClO4、LiBOB、LiDFOB、NaTFSI、NaFSI、NaClO4The concentration of the electrolyte salt in the electrolyte solution is 0.5mol/L to 5 mol/L.
Further preferably, the non-aqueous organic solvent is one or more of 1, 3-dioxolane, ethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, fluoroethylene carbonate, methyl fluoroacetate, propyl fluoroacetate, γ -butyrolactone, and sulfolane.
Generally, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
1. the two-dimensional nano-structure electrolyte additive prepared by the preparation method has high strength and certain flexibility, the thickness of the additive is not more than 10 nanometers, when the additive forms uniform colloid in electrolyte, the additive can mechanically suppress the growth of dendrite of the electrolyte and enhance the interface stability of an electrode/electrolyte, and furthermore, alkali metal ions or electrolyte salt anions can interact with the two-dimensional nano-structure electrolyte additive through electrostatic force or van der Waals force, so that the conductivity and ion transference number of the electrolyte are improved, and the uniform deposition of the alkali metal ions is promoted.
2. The two-dimensional nanostructure electrolyte additive can form uniform colloid in the lithium battery electrolyte, so that the interaction between alkali metal ions or electrolyte salt anions and the two-dimensional nanostructure electrolyte additive is more uniform, the conductivity and ion migration number of the electrolyte are improved, and the uniform deposition of the alkali metal ions is promoted.
3. According to the preparation method, the organic or inorganic bulk material is stripped into the two-dimensional nanosheets with the thickness of less than 10 nanometers by adopting a ball milling method, an ultrasonic dispersion method or a chemical method, then the two-dimensional nanosheets are dispersed uniformly and then are subjected to freeze drying, and the obtained two-dimensional nanostructured electrolyte additive has the advantages of better control of thickness and more uniform appearance, so that the additive can form uniform colloid in the lithium battery electrolyte.
4. According to the preparation method, the ball milling time is 10-20 h; the ultrasonic dispersion time is 1-10 h; the dispersant used for ultrasonic dispersion is one or more of water, ethanol, isopropanol, N-dimethylformamide and N-methylpyrrolidone, so that the thickness of the prepared two-dimensional nanostructure electrolyte additive is better controlled, and the appearance is more uniform.
5. The electrolyte additive with the two-dimensional nano structure is added in the electrolyte of the non-aqueous alkali metal battery, when the electrolyte additive with the two-dimensional nano structure forms uniform colloid in the electrolyte, the electrolyte additive can mechanically suppress the growth of dendrite of the electrolyte and enhance the interface stability of an electrode/electrolyte, and furthermore, alkali metal ions or electrolyte salt anions can interact with the electrolyte additive with the two-dimensional nano structure through electrostatic force or van der Waals force, so that the conductivity and ion migration number of the electrolyte are improved, and the uniform deposition of the alkali metal ions is promoted.
Drawings
Fig. 1 is a graph of the room temperature cycling performance of the two-dimensional nanostructured electrolyte additive prepared in example 1 for a lithium metal symmetric cell;
FIG. 2 is a graph of the cycling performance of the two-dimensional nanostructured electrolyte additive prepared in example 1 for a lithium metal symmetric battery at 0 ℃;
fig. 3 is a graph of the cycling performance of the two-dimensional nanostructured electrolyte additive prepared in example 1 for a lithium metal symmetric cell at-20 ℃.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a two-dimensional nanostructured electrolyte additive which is a two-dimensional structured organic or inorganic nanosheet, wherein the two-dimensional structured organic or inorganic nanosheet comprises a two-dimensional nanostructured material, the two-dimensional nanostructured material is one or more of a boron nitride nanosheet, graphene oxide, a transition metal sulfide nanosheet, a two-dimensional metal organic framework material and a two-dimensional covalent organic framework material, and the thickness of the two-dimensional structured organic or inorganic nanosheet is not more than 10 nanometers. The two-dimensional nanostructured electrolyte additive can form a uniform colloid in the electrolyte of a non-aqueous alkali metal battery.
The preparation method of the two-dimensional nano-structure electrolyte additive comprises the following steps:
(1) and stripping the organic or inorganic bulk material into two-dimensional nanosheets with a thickness of less than 10 nanometers by adopting a ball milling method, an ultrasonic dispersion method or a chemical method. Wherein the ball milling time is 10-20 h; the ultrasonic dispersion time is 1-10 h; the dispersant used for ultrasonic dispersion is one or more of water, ethanol, isopropanol, N-dimethylformamide and N-methylpyrrolidone.
(2) And adding the two-dimensional nanosheets into deionized water for uniform dispersion to obtain a two-dimensional nanosheet dispersion, and freeze-drying the two-dimensional nanosheet dispersion to obtain the two-dimensional nanostructured electrolyte additive. Wherein, before the two-dimensional nanosheet dispersion is freeze-dried, the two-dimensional nanosheet dispersion is subjected to vacuum filtration.
The invention also provides a nonaqueous alkali metal battery electrolyte, which comprises electrolyte salt, a nonaqueous organic solvent and the two-dimensional nano-structure electrolyte additive prepared by the method. Wherein the mass fraction of the two-dimensional nano-structure electrolyte additive in the nonaqueous alkali metal battery electrolyte is 0.05-10%. The electrolyte salt is LiTFSI, LiFSI or LiPF6、LiBF4、LiClO4、LiBOB、LiDFOB、NaTFSI、NaFSI、NaClO4The concentration of the electrolyte salt in the electrolyte solution is 0.5mol/L to 5 mol/L. The non-aqueous organic solvent is one or more of 1, 3-dioxolane, ethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, fluoroethylene carbonate, methyl fluoroacetate, propyl fluoroacetate, gamma-butyrolactone and sulfolane.
The two-dimensional nano-structure electrolyte additive prepared by the preparation method has high strength and certain flexibility, and based on the characteristic, when the two-dimensional nano-structure electrolyte additive forms uniform colloid in electrolyte, the two-dimensional nano-structure electrolyte additive can mechanically suppress the growth of dendrite of the electrolyte and enhance the interface stability of an electrode/electrolyte, and further, alkali metal ions or electrolyte salt anions can interact with the two-dimensional nano-structure electrolyte additive through electrostatic force or van der Waals force, so that the conductivity and ion migration number of the electrolyte are improved, and the uniform deposition of the alkali metal ions is promoted.
Example 1
1. Preparation of the additives
The preparation method of the additive of this example includes the following steps:
(1) 2g of hexagonal boron nitride and 120g of urea are added into a 150mL polytetrafluoroethylene ball-milling tank, and ball-milling is carried out at the room temperature for 24h at the rotating speed of 500rpm after sealing.
(2) And (2) adding the mixture obtained in the step (1) into 1L of deionized water, and performing ultrasonic dispersion for 1 h.
(3) And (3) carrying out vacuum filtration on the dispersion liquid obtained in the step (2), washing for 2 times by using deionized water, and carrying out freeze drying to obtain the nano-silver-coated copper-nickel-zinc-coated copper-nickel alloy.
The additive of this example was white powder, and formed a gel in the electrolyte, and was added in a mass ratio of 0.7%.
2. Preparation of the electrolyte
Adding DOL and DME into a mixture in a volume ratio of 1:1 mixing, followed by addition of LiTFSI and LiNO3To prepare 1M LiTFSI and 2 wt% LiNO3After dissolving, the above additives are added according to a ratio of 99.3: 0.7, and stirring overnight to obtain the desired electrolyte.
The lithium metal symmetric battery of the embodiment adopts a 250 μm thick lithium foil button battery, and the dosage of the electrolyte is 60 μ L. The cycle performance at room temperature and low temperature (0 ℃ and-20 ℃) was tested as shown in fig. 1, fig. 2 and fig. 3.
Example 2
The additive was prepared in substantially the same manner as in example 1, except that sucrose was used instead of urea for ball milling. Further, the additive and the electrolyte were mixed in a ratio of 99: 1 mass ratio, 1M LiTFSI is adopted as electrolyte salt, and DOL + DME (1:1, vol) is adopted as organic solvent. The lithium metal symmetrical battery is also tested, and the using amount of the electrolyte is unchanged. The room temperature cycle performance was tested.
Example 3
1. Preparation of the additives
The preparation method of the additive of this example includes the following steps:
(1) under the protection of argon, 4g of MoS2The powder and 25.6mL of 2.5M n-butyllithium were stirred at room temperature for 72 h.
(2) And (2) carrying out vacuum filtration on the suspension obtained in the step (1), washing twice with normal hexane, dispersing the filter cake in deionized water, and carrying out ultrasonic treatment for 1 h.
(3) And (3) dialyzing the black dispersion liquid obtained in the step (2) in deionized water for 4 days, and freeze-drying to obtain the black pigment.
2. Preparation of the electrolyte
The electrolyte salt adopts 1M LiPF6And 2 wt% FEC, organic solvent EC + EMC + DMC (4: 3: 3, wt). After dissolution, the above additives were added as 95: 5, and stirring overnight to obtain the required electrolyte. The lithium metal symmetric battery of the embodiment adopts a 250 μm thick lithium foil button battery, and the dosage of the electrolyte is 60 μ L. The cycle performance was tested at room temperature and elevated temperature (60 ℃).
Example 4
The additive was prepared in the same manner as in example 3. The electrolyte salt adopts 1M NaClO4The organic solvent adopts EC + EMC (1:1, vol), and the electrolyte and the additive are mixed in a ratio of 99.5: 0.5 mixing. The sodium metal symmetric cell was tested with an electrolyte usage of 60 mul. The room temperature cycle performance was tested.
Example 5
1. Preparation of the additives
The preparation method of the additive of this example includes the following steps:
(1)33g of graphite powder and 1.5g of sodium nitrate are added into 70mL of concentrated sulfuric acid (98 wt%), and 9g of potassium permanganate is slowly added under stirring in an ice bath.
(2) The suspension obtained in step (1) was stirred at 35 ℃ for 0.5 h.
(3) 150mL of deionized water was slowly added to the suspension obtained in step (2) and stirred at 90 ℃ for 15 min.
(4) And (3) adding 15mL of hydrogen peroxide into 500mL of deionized water, uniformly mixing, slowly adding into the suspension obtained in the step (3), and stirring at 90 ℃ until the dispersion becomes brown yellow.
(5) And (4) carrying out vacuum filtration on the suspension obtained in the step (4), washing with dilute hydrochloric acid and deionized water for many times, dispersing a filter cake into the deionized water, dialyzing for 1 week, and carrying out freeze drying to obtain the compound.
2. Preparation of the electrolyte
Mixing EC, EMC and DMC according to a mass ratio of 4: 3: 3 mixing and subsequently adding LiPF6To prepare 1M LiPF6And (3) adding the additive after the electrolyte is dissolved, wherein the ratio of the additive to the electrolyte is 99: 1, and stirring overnight to obtain the required electrolyte.
The lithium metal symmetric battery of the embodiment adopts a 250 μm thick lithium foil button battery, and the dosage of the electrolyte is 60 μ L. The cycle performance was tested at room temperature and low temperature (0 ℃ and-20 ℃).
Example 6
The preparation of the additive was the same as in example 5. The electrolyte salt adopts 1M NaClO4The organic solvent adopts tetraethylene glycol dimethyl ether. The sodium metal symmetric cell was tested with an electrolyte usage of 60 mul. The room temperature cycle performance was tested.
Comparative example 1
Adding DOL and DME into a mixture in a volume ratio of 1:1 mixing, followed by addition of LiTFSI and LiNO3To prepare 1M LiTFSI and 2 wt% LiNO3The required comparative electrolyte is obtained, and the room temperature performance and the low temperature (0 ℃ and-20 ℃) performance of the lithium metal battery are tested.
Comparative example 2
Adding DOL and DME into a mixture in a volume ratio of 1:1, mixing, adding LiTFSI, preparing 1M LiTFSI electrolyte to obtain the required comparative electrolyte, and testing the room temperature performance of the lithium metal battery.
Table 1: list of properties of comparative examples 1-2 and examples 1-2
As can be seen from Table 1, under the condition of the same basic electrolyte, the addition of the additive can effectively reduce the polarization voltage of the battery and prolong the cycle life of the battery; the cycle stability is also improved obviously under low temperature condition. Due to the special structural characteristics of the additive, the high-strength and flexible two-dimensional nanosheet can mechanically suppress the growth of dendrites and enhance the interface stability of electrodes/electrolytes; meanwhile, alkali metal ions or electrolyte salt anions can interact with the two-dimensional nanosheets through electrostatic force or van der waals force, so that the conductivity and ion mobility of the electrolyte are improved, and uniform deposition of the alkali metal ions is promoted.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The two-dimensional nanostructured electrolyte additive is characterized in that the two-dimensional nanostructured electrolyte additive is a two-dimensional structured organic or inorganic nanosheet, the two-dimensional structured organic or inorganic nanosheet comprises a two-dimensional nanostructured material, the two-dimensional nanostructured material is one or more of a boron nitride nanosheet, graphene oxide, a transition metal sulfide nanosheet, a two-dimensional metal organic framework material and a two-dimensional covalent organic framework material, the thickness of the two-dimensional structured organic or inorganic nanosheet is not more than 10 nanometers, and when the two-dimensional structured organic or inorganic nanosheet forms an even colloid in an electrolyte, the growth of dendrites of the electrolyte can be mechanically suppressed, and the interface stability of an electrode/electrolyte can be enhanced.
2. A two-dimensional nanostructured electrolyte additive according to claim 1, wherein the two-dimensional nanostructured electrolyte additive is capable of forming a homogeneous colloid in a non-aqueous alkali metal battery electrolyte.
3. A method of preparing a two-dimensional nanostructured electrolyte additive according to any of claims 1-2, comprising the steps of:
(1) stripping organic or inorganic bulk materials into two-dimensional nanosheets with a thickness of less than 10 nanometers by adopting a ball milling, ultrasonic dispersion or chemical method;
(2) and adding the two-dimensional nanosheets into deionized water for uniform dispersion to obtain a two-dimensional nanosheet dispersion, and freeze-drying the two-dimensional nanosheet dispersion to obtain the two-dimensional nanostructured electrolyte additive.
4. The preparation method according to claim 3, wherein in the step (1), the ball milling time is 10-20 h; the ultrasonic dispersion time is 1-10 h; the dispersant used for ultrasonic dispersion is one or more of water, ethanol, isopropanol, N-dimethylformamide and N-methylpyrrolidone.
5. The preparation method according to claim 3, wherein in the step (2), before the two-dimensional nanosheet dispersion is freeze-dried, the two-dimensional nanosheet dispersion is subjected to vacuum filtration.
6. A non-aqueous alkali metal battery electrolyte comprising an electrolyte salt, a non-aqueous organic solvent, the two-dimensional nanostructured electrolyte additive of claim 1, which forms a homogeneous colloid in the electrolyte, which mechanically suppresses electrolyte dendrite growth and enhances electrode/electrolyte interfacial stability.
7. The non-aqueous alkali metal battery electrolyte of claim 6 wherein the two-dimensional nanostructured electrolyte additive is present in the non-aqueous alkali metal battery electrolyte at a mass fraction of 0.05% to 10%.
8. The non-aqueous alkali metal battery electrolyte of claim 6 wherein the electrolyte salt is LiTFSI, LiFSI, LiPF6、LiBF4、LiClO4、LiBOB、LiDFOB、NaTFSI、NaFSI、NaClO4The concentration of the electrolyte salt in the electrolyte solution is 0.5mol/L to 5 mol/L.
9. The non-aqueous alkali metal battery electrolyte of claim 6 wherein the non-aqueous organic solvent is one or more of 1, 3-dioxolane, ethylene glycol dimethyl ether, triglyme, tetraglyme, ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, fluoroethylene carbonate, methyl fluoroacetate, propyl fluoroacetate, γ -butyrolactone, sulfolane.
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| CN111604030B (en) * | 2020-05-27 | 2022-03-22 | 首都师范大学 | Graphene oxide-covalent organic framework material composite material, capillary electrochromatography column and preparation method |
| CN113851697B (en) * | 2021-09-27 | 2023-10-03 | 河南景创新能源科技有限公司 | Preparation method and application of thin layered solid electrolyte membrane |
| CN114583261B (en) * | 2022-03-10 | 2023-11-10 | 山东天润新能源材料有限公司 | Preparation method of sodium ion secondary battery electrolyte containing graphene oxide |
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