Lithium sodium fluorocarboxylate electrolyte

Abstract

The invention discloses a sodium lithium fluorocarboxylate electrolyte, and relates to the technical field of electrolyte preparation. Comprising the following steps: preparing raw materials, mixing various liquids to obtain a reaction liquid, carrying out ion exchange, mixing and stirring, and preparing the following raw materials in percentage by weight: 35% of an organic solvent, 15% of a trifluoromethoxy compound, 20% of electrolyte salt, 10% of a functional additive, 5% of carbonic ester, 5% of carboxylic ester, 5% of fluoroether and 5% of aromatic hydrocarbon, the organic solvent comprises any one or a combination of at least two of carbonic ester, carboxylic ester, fluoro-carboxylic ester, propionate, fluoroether or aromatic hydrocarbon, and the content of carboxylic ester in the organic solvent is less than or equal to 65%. According to the sodium lithium fluorocarboxylate electrolyte, oxygenolysis can be reduced, increase of side reaction products can be reduced, and the situation that the electrolyte is greatly consumed is avoided, so that the prepared electrolyte has long-term effective measures for delaying or inhibiting generation of lithium dendrites, impurities are removed, the purity of the electrolyte is increased, and the using effect of the electrolyte is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrolyte preparation, and particularly relates to a lithium sodium salt electrolyte of fluorinated carboxylic acid. Background Art

[0002] The electrolyte is a term with a broad meaning, and the content it represents varies greatly for different industries. There is an electrolyte in the organism, also known as an electrolyte, and there is also an electrolyte applied to the battery industry, as well as electrolytes for industries such as electrolytic capacitors and supercapacitors. The electrolytes applied in different industries have extremely different compositions, and even are completely different.

[0003] Currently, for the electrolyte used in the battery industry, the main ingredients are carbonate esters and carboxylic acid esters. When the electrolyte is used at a relatively high voltage, it is prone to oxidative decomposition, resulting in an increase in side reaction products and a large consumption of the electrolyte.

[0004] When the existing electrolyte is used in the battery industry, the existing electrolyte plays a key role in extending the service life of the battery, but there are no long-term effective measures for delaying or inhibiting the generation of lithium dendrites. The decomposition of sodium salts easily affects the safety performance of the battery and the service life of charge and discharge cycles.

[0005] When the existing electrolyte is prepared, impurities are not easily removed, resulting in a low purity of the electrolyte and affecting the use effect of the electrolyte.

[0006] Therefore, the present invention proposes a new lithium / sodium salt electrolyte of fluorinated carboxylic acid. Summary of the Invention

[0007] The main purpose of the present invention is to provide a lithium sodium salt electrolyte of fluorinated carboxylic acid to solve the problems raised in the above background.

[0008] To achieve the above purpose, the technical solution adopted by the present invention is: a lithium sodium salt electrolyte of fluorinated carboxylic acid, and the method includes raw material preparation, obtaining a reaction solution after mixing various liquids, ion exchange, mixing, and the following raw materials by weight: 35% of organic solvent, 15% of trifluoromethoxy compound, 20% of electrolyte salt, 10% of functional additive, 5% of carbonate ester, 5% of carboxylic acid ester, 5% of fluoroether, and 5% of aromatic hydrocarbon.

[0009] The organic solvent includes any one or at least two combinations of carbonate ester, carboxylic acid ester, fluorinated carboxylic acid ester, propionate ester, fluoroether, or aromatic hydrocarbon.

[0010] The trifluoromethoxy compound includes one or at least two combinations of C6-14 aryl, C5-14 heteroaryl, C1-10 alkyl, -C(=O)-C1-10 alkyl, -C(=O)-O-C(=O)-C1-10 alkyl.

[0011] The content of carboxylic ester in the organic solvent is less than or equal to 65%;

[0012] The carbonate is selected from at least one of the following fluorinated or unsubstituted solvents: ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, and methyl ethyl carbonate.

[0013] The carbonate includes halogenated carbonate or non-halogenated carbonate;

[0014] The non-halogenated carbonate includes any one or a combination of at least two of ethylene carbonate, propylene carbonate, diethyl carbonate, dimethyl carbonate, and methyl ethyl carbonate.

[0015] The halogenated carbonate includes any one or a combination of at least two of fluorinated ethylene carbonate, difluorinated ethylene carbonate, bis-fluorinated propylene carbonate, ethyl trifluoroacetate, trifluoroethyl methyl carbonate, trifluoromethyl ethylene carbonate, trifluoromethyl carbonate, chlorinated ethylene carbonate, dicarbonate, methyl trifluoropropionate, ethyl trifluoroacetate, methyl trifluorobenzoate, ethyl trifluorobutyrate, and hexafluoroisopropyl acrylate.

[0016] The carboxylic ester includes halogenated carboxylic ester or non-halogenated carboxylic ester;

[0017] The non-halogenated carboxylic ester includes any one or a combination of at least two of propyl butyrate, propyl acetate, isopropyl acetate, butyl propionate, isopropyl propionate, ethyl butyrate, methyl propionate, ethyl propionate, and propyl propionate.

[0018] The halogenated carboxylic ester includes any one or a combination of at least two of fluorinated propyl butyrate, fluorinated propyl acetate, fluorinated isopropyl acetate, fluorinated butyl propionate, fluorinated isopropyl propionate, fluorinated ethyl butyrate, fluorinated methyl propionate, fluorinated ethyl propionate, and fluorinated propyl propionate.

[0019] The aromatic hydrocarbon includes halogenated aromatic hydrocarbon or non-halogenated aromatic hydrocarbon;

[0020] The halogenated aromatic hydrocarbon includes any one or a combination of at least two of monofluorobenzene, difluorobenzene, trifluorobenzene, trifluorotoluene, and dichlorotrifluorotoluene; The raw materials are equipped to prepare an organic solvent, a trifluoromethoxy compound, a hydrogen peroxide functional agent, an electrolyte salt, a functional additive, a carbonate, a carboxylic ester, a fluoroether, and an aromatic hydrocarbon according to the equipped weight.

[0021] The proportion of the electrolyte salt in the electrolyte solution is 33%; the proportion of the organic solvent in the electrolyte solution is 66%; the proportion of the fluorinated phenyl carbonate in the electrolyte salt is 55%;

[0022] The electrolyte salt includes lithium salt and / or sodium salt;

[0023] The lithium salt is selected from at least one of lithium hexafluorophosphate, lithium difluorophosphate, lithium difluorooxalate borate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethylsulfonyl)imide, lithium difluorobis(oxalato)phosphate, lithium tetrafluoroborate, lithium bis(oxalato)borate, lithium hexafluoroantimonate, lithium hexafluoroarsenate, lithium bis(trifluoromethylsulfonyl)imide, lithium bis(pentafluoroethylsulfonyl)imide, lithium tris(trifluoromethylsulfonyl)methyl, or lithium bis(trifluoromethylsulfonyl)imide;

[0024] The sodium salt is selected from at least one of NaPF6, NaClO4, NaAlCl4, NaFeCl4, NaSO3CF3, NaBCl4, NaNO3, NaPOF4, NASCN, NACN, NaAsF6, NaCF3CO2, NaSbF6, NaC6H5CO2, Na(CH3)C6H4SO3, NaHSO4, or NaB(C6H5)4;

[0025] The content of the electrolyte salt in the electrolyte is 8% - 16%.

[0026] The mixing includes stirring treatment, cooling treatment, and a thermostat;

[0027] Both the stirring treatment and the cooling treatment are connected to the thermostat, and the internal temperature can be regulated during the stirring treatment and the cooling treatment. After the weighing of the ingredients is completed and the reaction solution is prepared, it enters the mixing to achieve the stirring treatment and the cooling treatment, thereby obtaining the electrolyte.

[0028] The ion exchange includes precipitation, ion exchange resin, and impurity removal. The ion exchange resin includes hydrogen peroxide solvent, lithiated molecular sieve, and ethanol solution. After the mixed reaction solution precipitates for a period of time, adding the lithiated molecular sieve and ethanol solution can perform plasma exchange to achieve impurity removal.

[0029] A lithium sodium salt electrolyte of fluorinated carboxylic acid includes the following steps:

[0030] Step 1: First, prepare the raw materials according to the above - given component ratios. The raw materials are by weight: organic solvent 35%, trifluoromethoxy compound 15%, electrolyte salt 20%, functional additive 10%, carbonate 5%, carboxylate 5%, fluoroether 5%, and aromatic hydrocarbon 5%. After the raw materials are prepared, the weights of various liquids are adjusted.

[0031] Step 2: After adjusting the weights of various liquids and mixing them to obtain a reaction solution, the reaction solution includes a basic organic solvent, a trifluoromethoxy compound, and a hydrogen peroxide functional agent. At a relatively high voltage, the added hydrogen peroxide functional agent decomposes into water and oxygen. Heat it to 65°C and cool it for 6 hours. The water can no longer decompose, which can reduce the oxidation and decomposition of the electrolyte, reduce the increase of side - reaction products, and avoid the situation of large consumption of the electrolyte.

[0032] Step 3: The organic solvent, trifluoromethoxy compound, hydrogen peroxide functional agent, electrolyte salt, functional additive, carbonate, carboxylate, fluoroether, and aromatic hydrocarbon pretreated in Step 2 are mixed evenly. The reaction solution is used for various performances of the battery, so that the prepared electrolyte has long-term effective measures for delaying or inhibiting the generation of lithium dendrites.

[0033] Step 4: The electrolyte is introduced into the compound mixture prepared in Step 3, and the organic solvent, trifluoromethoxy compound, hydrogen peroxide functional agent, electrolyte salt, functional additive, carbonate, carboxylate, fluoroether, and aromatic hydrocarbon are mixed evenly.

[0034] Step 5: After mixing evenly, after precipitation for a period of time, lithium aluminosilicate zeolite and ethanol solution are added for plasma exchange to remove impurities after the reaction, improve the purity of the electrolyte, and increase the safety performance of the battery and the service life of charge and discharge cycles.

[0035] The present invention has the following beneficial effects:

[0036] 1. In the present invention, a reaction solution is obtained by mixing various liquids. The reaction solution includes a basic organic solvent, a trifluoromethoxy compound, and a hydrogen peroxide functional agent. When the electrolyte is used in the battery industry and at a relatively high voltage, the hydrogen peroxide functional agent added decomposes into water and oxygen, and water cannot decompose further. Therefore, the electrolyte can reduce oxidative decomposition, reduce the increase of side reaction products, and avoid the situation of large consumption of the electrolyte.

[0037] 2. In the present invention, by adding a compound, the electrolyte obtains a reaction solution, improving various performances of the electrolyte for the battery. The prepared electrolyte has long-term effective measures for delaying or inhibiting the generation of lithium dendrites. At the same time, after the sodium salt decomposes, it does not affect the safety performance of the battery and the service life of charge and discharge cycles.

[0038] 3. In the present invention, through ion exchange, which includes precipitation, ion exchange resin, and impurity removal. During the preparation of the electrolyte, after mixing and stirring, the obtained mixed solution is precipitated for a period of time. The precipitation is used to let the reaction solution stand still, so that the side reaction products in the reaction solution are completely precipitated. The ion exchange resin exchanges cations and anions in the solution, and then lithium aluminosilicate zeolite and ethanol solution are added for plasma exchange to achieve impurity removal, increase the purity of the electrolyte, and improve the use effect of the electrolyte. Brief Description of the Drawings

[0039] Figure 1 It is a process architecture diagram of a lithium sodium salt electrolyte of fluorinated carboxylic acid of the present invention;

[0040] Figure 2 It is a process architecture diagram of mixing of a lithium sodium salt electrolyte of fluorinated carboxylic acid of the present invention;

[0041] Figure 3 This is the process framework diagram of the ion exchange of a lithium sodium salt electrolyte of fluoro carboxylic acid in the present invention. Detailed implementation manners

[0042] To make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with the detailed implementation manners.

[0043] Example 1

[0044] Please refer to Figure 1-2 As shown: A lithium sodium salt electrolyte of fluoro carboxylic acid includes raw material preparation, obtaining a reaction solution after mixing various liquids, ion exchange, mixing, and the following raw materials by weight: 35% of organic solvent, 15% of trifluoromethoxy compound, 20% of electrolyte salt, 10% of functional additive, 5% of carbonate, 5% of carboxylate, 5% of fluoroether, and 5% of aromatic hydrocarbon;

[0045] The organic solvent includes any one or a combination of at least two of carbonate, carboxylate, fluoro carboxylate, propionate, fluoroether or aromatic hydrocarbon;

[0046] The trifluoromethoxy compound includes a combination of one or at least two of C6-14 aryl, C5-14 heteroaryl, C1-10 alkyl, -C(=O)-C1-10 alkyl, -C(=O)-O-C(=O)-C1-10 alkyl;

[0047] The content of carboxylate in the organic solvent is less than or equal to 65%;

[0048] The carbonate is selected from at least one of the following fluorinated or unsubstituted solvents: ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate.

[0049] The carbonate includes halogenated carbonate or non-halogenated carbonate;

[0050] The non-halogenated carbonate includes any one or a combination of at least two of ethylene carbonate, propylene carbonate, diethyl carbonate, dimethyl carbonate or methyl ethyl carbonate.

[0051] The halogenated carbonate includes any one or a combination of at least two of fluorinated ethylene carbonate, difluorinated ethylene carbonate, bisfluorocarbonate propylene carbonate, ethyl trifluoroacetate, trifluoroethyl methyl carbonate, trifluoromethyl ethylene carbonate, trifluoromethyl carbonate ethylene carbonate, chlorinated ethylene carbonate, dicarbonate, methyl trifluoropropionate, ethyl trifluoroacetate, methyl trifluorobenzoate, ethyl trifluorobutyrate or hexafluoroisopropyl acrylate;

[0052] The carboxylate includes halogenated carboxylate or non-halogenated carboxylate;

[0053] The non-halogenated carboxylic acid esters include any one or a combination of at least two of propyl butyrate, propyl acetate, isopropyl acetate, butyl propionate, isopropyl propionate, ethyl butyrate, methyl propionate, ethyl propionate or propyl propionate.

[0054] The halogenated carboxylic acid esters include any one or a combination of at least two of propyl fluorobutyrate, propyl fluoroacetate, isopropyl fluoroacetate, butyl fluoropropionate, isopropyl fluoropropionate, ethyl fluorobutyrate, methyl fluoropropionate, ethyl fluoropropionate or propyl fluoropropionate.

[0055] The aromatic hydrocarbons include halogenated aromatic hydrocarbons or non-halogenated aromatic hydrocarbons;

[0056] The halogenated aromatic hydrocarbons include any one or a combination of at least two of monofluorobenzene, difluorobenzene, trifluorobenzene, trifluorotoluene or dichlorotrifluorotoluene; The raw materials are equipped to equip organic solvents, trifluoromethoxy compounds, hydrogen peroxide functional agents, electrolyte salts, functional additives, carbonates, carboxylic acid esters, fluoroethers and aromatic hydrocarbons according to the equipped weight.

[0057] The proportion of the electrolyte salt in the electrolyte solution is 33%; the proportion of the organic solvent in the electrolyte solution is 66%; the proportion of fluorobenzene carbonate in the electrolyte salt is 55%;

[0058] The electrolyte salt includes lithium salt and / or sodium salt;

[0059] The lithium salt is selected from at least one of lithium hexafluorophosphate, lithium difluorophosphate, lithium difluorooxalate borate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethylsulfonyl)imide, lithium difluorobis(oxalato)phosphate, lithium tetrafluoroborate, lithium bis(oxalato)borate, lithium hexafluoroantimonate, lithium hexafluoroarsenate, lithium bis(trifluoromethylsulfonyl)imide, lithium bis(pentafluoroethylsulfonyl)imide, lithium tris(trifluoromethylsulfonyl)methyl or lithium bis(trifluoromethylsulfonyl)imide;

[0060] The sodium salt is selected from at least one of NaPF6, NaClO4, NaAlCl4, NaFeCl4, NaSO3CF3, NaBCl4, NaNO3, NaPOF4, NASCN, NACN, NaAsF6, NaCF3CO2, NaSbF6, NaC6H5CO2, Na(CH3)C6H4SO3, NaHSO4 or NAB(C6H5)4;

[0061] The content of the electrolyte salt in the electrolyte solution is 8% - 16%.

[0062] In the process of preparing the electrolyte, a reaction solution is obtained by mixing various liquids. The reaction solution includes a basic organic solvent, a trifluoromethoxy compound, and a hydrogen peroxide functional agent. When the electrolyte is used in the battery industry and is applied at a relatively high voltage, the hydrogen peroxide functional agent added decomposes into water and oxygen, and the water cannot decompose further. Therefore, the electrolyte can reduce oxidative decomposition, reduce the increase of side reaction products, and avoid the situation of substantial consumption of the electrolyte.

[0063] Example Two

[0064] Please refer to Figure 2 As shown: A lithium sodium salt electrolyte of fluorinated carboxylic acid includes raw material preparation, obtaining a reaction solution by mixing various liquids, ion exchange, mixing, and the following raw materials by weight: 35% of organic solvent, 15% of trifluoromethoxy compound, 20% of electrolyte salt, 10% of functional additive, 5% of carbonate, 5% of carboxylate, 5% of fluoroether, and 5% of aromatic hydrocarbon;

[0065] The organic solvent includes any one or at least two combinations of carbonate, carboxylate, fluorinated carboxylate, propionate, fluoroether, or aromatic hydrocarbon;

[0066] The trifluoromethoxy compound includes one or at least two combinations of C6-14 aryl, C5-14 heteroaryl, C1-10 alkyl, -C(=O)-C1-10 alkyl, -C(=O)-O-C(=O)-C1-10 alkyl;

[0067] The content of carboxylate in the organic solvent is less than or equal to 65%;

[0068] The carbonate is selected from at least one of the following fluorinated or unsubstituted solvents: ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate.

[0069] The mixing includes stirring treatment, cooling treatment, and a thermostat;

[0070] The stirring treatment and the cooling treatment are both connected to the thermostat, and the internal temperature can be regulated during the stirring treatment and the cooling treatment. After the weighing of the ingredients by weight is completed and the reaction solution is prepared, it enters the mixing to achieve the stirring treatment and the cooling treatment, thereby obtaining the electrolyte.

[0071] In the process of preparing the electrolyte, by adding a compound, the electrolyte obtains a reaction solution, improving various performances of the electrolyte for batteries. The prepared electrolyte has long-term effective measures for delaying or inhibiting the generation of lithium dendrites, and at the same time, after the sodium salt decomposes, it does not affect the safety performance of the battery and the service life of the charge and discharge cycle.

[0072] Example Three

[0073] Please refer toFigure 3 As shown: A lithium sodium salt electrolyte of fluorinated carboxylic acid, including raw material preparation, obtaining a reaction liquid after mixing various liquids, ion exchange, mixing, and the following raw materials by weight: 35% of organic solvent, 15% of trifluoromethoxy compound, 20% of electrolyte salt, 10% of functional additive, 5% of carbonate, 5% of carboxylate, 5% of fluoroether, and 5% of aromatic hydrocarbon;

[0074] The organic solvent includes any one or at least two combinations of carbonate, carboxylate, fluorinated carboxylate, propionate, fluoroether, or aromatic hydrocarbon;

[0075] The trifluoromethoxy compound includes one or at least two combinations of C6-14 aryl, C5-14 heteroaryl, C1-10 alkyl, -C(=O)-C1-10 alkyl, -C(=O)-O-C(=O)-C1-10 alkyl;

[0076] The content of carboxylate in the organic solvent is less than or equal to 65%;

[0077] The carbonate is selected from at least one of the following fluorinated or unsubstituted solvents: ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate.

[0078] The ion exchange includes precipitation, ion exchange resin, and impurity removal. The ion exchange resin includes hydrogen peroxide solvent, lithiated molecular sieve, and ethanol solution. When the reaction liquid after mixing precipitates for a period of time, then adding the lithiated molecular sieve and ethanol solution can carry out plasma exchange to achieve impurity removal.

[0079] In the process of preparing the electrolyte, by setting ion exchange, which includes precipitation, ion exchange resin, and impurity removal. When preparing the electrolyte, after mixing and treatment, the obtained mixed liquid is allowed to precipitate for a period of time. The precipitation is used to let the reaction liquid after mixing stand still, so that the side reaction products in the reaction liquid are completely precipitated. The ion exchange resin exchanges ions with cations and anions in the solution, and then adding the lithiated molecular sieve and ethanol solution for plasma exchange to achieve impurity removal, increasing the purity of the electrolyte and improving the use effect of the electrolyte.

[0080] In the present invention, a lithium sodium salt electrolyte of fluorinated carboxylic acid. During the operation of the process of the present invention, raw materials need to be prepared first. After the raw materials are prepared, a reaction solution is obtained by mixing various liquids. By mixing various liquids, the reaction solution is obtained, and the reaction solution includes a basic organic solvent, a trifluoromethoxy compound, and a hydrogen peroxide functional agent. When the electrolyte is used in the battery industry, when the electrolyte is used at a relatively high voltage, the hydrogen peroxide functional agent added decomposes into water and oxygen, and the water cannot be decomposed further. Therefore, the electrolyte can reduce oxidative decomposition, reduce the increase of side reaction products, and avoid the situation of large consumption of the electrolyte; by adding a compound, the electrolyte obtains a reaction solution. When used in a battery, various performances of the obtained battery are improved. In the battery obtained by the present invention, the 3C discharge rate at room temperature is above 79.4% at the 3C charge rate, the 1C discharge rate at -20°C is above 80.1%, the capacity retention rate of 800 times of 3C charge and discharge cycles at room temperature is above 82.5%, and the capacity retention rate of 800 times of 3C charge and discharge cycles at 45°C high temperature is above 81.2%. The comprehensive performance is excellent, improving various performances of the electrolyte used in the battery, and enabling the prepared electrolyte to have long-term effective measures for delaying or inhibiting the generation of lithium dendrites. At the same time, after the sodium salt decomposes, it does not affect the safety performance of the battery and the service life of the charge and discharge cycle; through ion exchange, the ion exchange includes precipitation, ion exchange resin, and impurity removal. When preparing the electrolyte, after mixing and stirring, the obtained mixed solution is allowed to precipitate for a period of time. The precipitation is used to let the reaction solution stand still, so that the side reaction products in the reaction solution are completely precipitated. The ion exchange resin exchanges cations and anions in the solution, and then lithium molecular sieve and ethanol solution are added for plasma exchange to achieve impurity removal, increase the purity of the electrolyte, and improve the use effect of the electrolyte. The entire preparation process of the lithium sodium salt electrolyte of fluorinated carboxylic acid is easy to operate, with low manual operation intensity and strong practicability. When used in the battery field, it can better improve the safety performance of battery use and avoid affecting the safety performance of the battery and the service life of the charge and discharge cycle.

[0081] A lithium sodium salt electrolyte of fluorinated carboxylic acid, comprising the following steps:

[0082] Step 1: First, prepare the raw materials according to the above-given component ratios. The raw materials are by weight: 35% of organic solvent, 15% of trifluoromethoxy compound, 20% of electrolyte salt, 10% of functional additive, 5% of carbonate, 5% of carboxylate, 5% of fluoroether, and 5% of aromatic hydrocarbon. After the raw materials are prepared, weight modulation is carried out on various liquids.

[0083] Step 2: After modulating various liquid weights and making them mix to obtain a reaction solution, the reaction solution includes a basic organic solvent, a trifluoromethoxy compound, and a hydrogen peroxide functional agent. At a relatively high voltage, the added hydrogen peroxide functional agent decomposes into water and oxygen. Heat it to 65°C and cool for 6 hours. The water can no longer decompose, which can reduce the oxidation and decomposition of the electrolyte, reduce the increase of side reaction products, and avoid the situation of large consumption of the electrolyte;

[0084] Step 3: The organic solvent, trifluoromethoxy compound, hydrogen peroxide functional agent, electrolyte salt, functional additive, carbonate, carboxylate, fluoroether, and aromatic hydrocarbon pretreated in Step 2 are mixed evenly. The reaction solution is used for various performance aspects of the battery, so that the prepared electrolyte has long-term effective measures for delaying or inhibiting the generation of lithium dendrites;

[0085] Step 4: Connect the electrolyte to the compound mixture prepared in Step 3, and mix evenly the organic solvent, trifluoromethoxy compound, hydrogen peroxide functional agent, electrolyte salt, functional additive, carbonate, carboxylate, fluoroether, and aromatic hydrocarbon;

[0086] Step 5: After mixing evenly, let it precipitate for a period of time, and then add lithiated molecular sieve and ethanol solution for plasma exchange to react to remove impurities, improve the purity of the electrolyte, and increase the safety performance and service life of charge and discharge cycles of the battery.

[0087] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A lithium sodium salt electrolyte of fluorinated carboxylic acid, characterized in that, It includes raw material preparation, obtaining a reaction solution after mixing various liquids, ion exchange, mixing, and raw materials by weight: 35% of an organic solvent, 15% of a trifluoromethoxy compound, 20% of an electrolyte salt, 10% of a functional additive, 5% of a carbonate, 5% of a carboxylate, 5% of a fluoroether, and 5% of an aromatic hydrocarbon; The organic solvent includes any one or a combination of at least two of a carbonate, a carboxylate, a fluorocarboxylate, a propionate, a fluoroether, or an aromatic hydrocarbon; The trifluoromethoxy compound includes a combination of one or at least two of a C6-14 aryl, a C5-14 heteroaryl, a C1-10 alkyl, -C(=O)-C1-10 alkyl, -C(=O)-O-C(=O)-C1-10 alkyl; The content of the carboxylate in the organic solvent is less than or equal to 65%; The carbonate is selected from at least one of the following fluorinated or unsubstituted solvents: ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate.

2. The lithium sodium salt electrolyte of fluorinated carboxylic acid according to claim 1, wherein The carbonate includes a halogenated carbonate or a non-halogenated carbonate; The non-halogenated carbonate includes any one or a combination of at least two of ethylene carbonate, propylene carbonate, diethyl carbonate, dimethyl carbonate, or methyl ethyl carbonate.

3. The lithium sodium salt of fluorocarboxylic acid electrolyte according to claim 1, characterized in that, The halogenated carbonate includes any one or a combination of at least two of fluorinated ethylene carbonate, difluorinated ethylene carbonate, bisfluorocarbonate propylene carbonate, ethyl trifluoroacetate, trifluoroethyl methyl carbonate, trifluoromethyl ethylene carbonate, trifluoromethyl carbonate ethylene carbonate, chlorinated ethylene carbonate, dicarbonate, methyl trifluoropropionate, ethyl trifluoroacetate, methyl trifluorobenzoate, ethyl trifluorobutyrate, or hexafluoroisopropyl acrylate; 4. A lithium sodium salt of fluorocarboxylic acid electrolyte according to claim 1, characterized in that, The carboxylate includes a halogenated carboxylate or a non-halogenated carboxylate; The non-halogenated carboxylate includes any one or a combination of at least two of propyl butyrate, propyl acetate, isopropyl acetate, butyl propionate, isopropyl propionate, ethyl butyrate, methyl propionate, ethyl propionate, or propyl propionate.

5. A lithium sodium salt electrolyte of fluorinated carboxylic acid according to claim 1, characterized in that, The halogenated carboxylate includes any one or a combination of at least two of fluorinated propyl butyrate, fluorinated propyl acetate, fluorinated isopropyl acetate, fluorinated butyl propionate, fluorinated isopropyl propionate, fluorinated ethyl butyrate, fluorinated methyl propionate, fluorinated ethyl propionate, or fluorinated propyl propionate.

6. The lithium sodium salt of fluorinated carboxylic acid electrolyte according to claim 1, characterized in that, The aromatic hydrocarbon includes a halogenated aromatic hydrocarbon or a non-halogenated aromatic hydrocarbon; The halogenated aromatic hydrocarbon includes any one or a combination of at least two of monofluorobenzene, difluorobenzene, trifluorobenzene, trifluorotoluene, or dichlorotrifluorotoluene; The raw material preparation is used to prepare an organic solvent, a trifluoromethoxy compound, a hydrogen peroxide functional agent, an electrolyte salt, a functional additive, a carbonate, a carboxylate, a fluoroether, and an aromatic hydrocarbon according to the equipped weights.

7. The lithium sodium salt of fluorinated carboxylic acid electrolyte according to claim 1, wherein The proportion of the electrolyte salt in the electrolyte solution is 33%; the proportion of the organic solvent in the electrolyte solution is 66%; the proportion of the fluorinated phenyl carbonate in the electrolyte salt is 55%; The electrolyte salt includes a lithium salt and / or a sodium salt; The lithium salt is selected from at least one of lithium hexafluorophosphate, lithium difluorophosphate, lithium difluorooxalate borate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethylsulfonyl)imide, lithium difluorobis(oxalato)phosphate, lithium tetrafluoroborate, lithium bis(oxalato)borate, lithium hexafluoroantimonate, lithium hexafluoroarsenate, lithium bis(trifluoromethylsulfonyl)imide, lithium bis(pentafluoroethylsulfonyl)imide, lithium tris(trifluoromethylsulfonyl)methyl, or lithium bis(trifluoromethylsulfonyl)imide; The sodium salt is selected from at least one of NaPF6, NaClO4, NaAlCl4, NaFeCl4, NaSO3CF3, NaBCl4, NaNO3, NaPOF4, NASCN, NACN, NaAsF6, NaCF3CO2, NaSbF6, NaC6H5CO2, Na(CH3)C6H4SO3, NaHSO4, or NaB(C6H5)4; The content of the electrolyte salt in the electrolyte is 8% to 16%.

8. A lithium sodium salt of fluorocarboxylic acid electrolyte according to claim 1, characterized in that, The mixing includes stirring treatment, cooling treatment, and a thermostat; Both the stirring treatment and the cooling treatment are connected to the thermostat, and the internal temperature can be regulated during the stirring treatment and the cooling treatment. After the weighing of the ingredients by weight is completed and the reaction solution is prepared, it enters the mixing to achieve the stirring treatment and the cooling treatment, thereby obtaining the electrolyte.

9. The lithium sodium salt electrolyte of fluorinated carboxylic acid according to claim 1, characterized in that, The ion exchange includes precipitation, ion exchange resin, and impurity removal. The ion exchange resin includes hydrogen peroxide solvent, lithiated molecular sieve, and ethanol solution. When the reaction solution after mixing precipitates for a period of time, adding the lithiated molecular sieve and ethanol solution can perform plasma exchange to achieve impurity removal.

10. A lithium sodium salt electrolyte of fluorinated carboxylic acid, comprising the following steps: Step 1: First, prepare the raw materials according to the above-given component ratios. The raw materials are by weight: 35% organic solvent, 15% trifluoromethoxy compound, 20% electrolyte salt, 10% functional additive, 5% carbonate, 5% carboxylate, 5% fluoroether, and 5% aromatic hydrocarbon. After the raw materials are prepared, the weights of various liquids are adjusted; Step 2: After adjusting the weights of various liquids, mix them to obtain a reaction solution. The reaction solution includes a basic organic solvent, a trifluoromethoxy compound, and a hydrogen peroxide functional agent. At a relatively high voltage, the added hydrogen peroxide functional agent decomposes into water and oxygen. Heat it to 65°C and cool it for 6 h. The water can no longer decompose, which can reduce the oxidation and decomposition of the electrolyte, reduce the increase of side reaction products, and avoid the situation of large consumption of the electrolyte; Step 3: The organic solvent, trifluoromethoxy compound, hydrogen peroxide functional agent, electrolyte salt, functional additive, carbonate, carboxylate, fluoroether, and aromatic hydrocarbon pretreated in Step 2 are mixed evenly. The reaction solution is used for various performances of the battery, so that the prepared electrolyte has long-term effective measures for delaying or inhibiting the generation of lithium dendrites; Step 4: Connect the electrolyte to the compound mixture prepared in Step 3, and mix the organic solvent, trifluoromethoxy compound, hydrogen peroxide functional agent, electrolyte salt, functional additive, carbonate, carboxylate, fluoroether, and aromatic hydrocarbon evenly; Step Five: After mixing evenly and allowing precipitation for a period of time, lithium-exchanged molecular sieve and ethanol solution are added for plasma exchange. After the reaction, impurity removal is achieved, the purity of the electrolyte is improved, and the safety performance of the battery and the service life of charge and discharge cycles are increased.

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