CN111613834A - Electrolyte and high-nickel power battery - Google Patents

Electrolyte and high-nickel power battery Download PDF

Info

Publication number
CN111613834A
CN111613834A CN201910131595.7A CN201910131595A CN111613834A CN 111613834 A CN111613834 A CN 111613834A CN 201910131595 A CN201910131595 A CN 201910131595A CN 111613834 A CN111613834 A CN 111613834A
Authority
CN
China
Prior art keywords
electrolyte
additive
fluorine
carbonate
organic solvent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201910131595.7A
Other languages
Chinese (zh)
Inventor
秦虎
陈黎
袁杰
陈晓琴
王峰
甘朝伦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhangjiagang Guotai Huarong New Chemical Materials Co Ltd
Original Assignee
Zhangjiagang Guotai Huarong New Chemical Materials Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhangjiagang Guotai Huarong New Chemical Materials Co Ltd filed Critical Zhangjiagang Guotai Huarong New Chemical Materials Co Ltd
Priority to CN201910131595.7A priority Critical patent/CN111613834A/en
Publication of CN111613834A publication Critical patent/CN111613834A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M10/0569—Liquid materials characterised by the solvents
    • 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
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte
    • H01M2300/0028—Organic electrolyte characterised by the solvent
    • H01M2300/0037—Mixture of solvents
    • 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

Abstract

The invention relates to an electrolyte suitable for a high-nickel power battery, which comprises lithium salt, an organic solvent and an additive, wherein the organic solvent is a mixture of non-fluorinated cyclic carbonate and fluorine-containing chain ester, and the additive is a combination of an additive A and/or an additive B and other additives; the fluorine-containing chain ester is one or more selected from the following substances shown in the structural general formula:
Figure DDA0001975539810000011
the additive A is selected from one or more of the substances shown in the following structural general formula:
Figure DDA0001975539810000012
the additive B is selected from one or more of the substances shown in the following structural general formula:

Description

Electrolyte and high-nickel power battery
Technical Field
The invention belongs to the technical field of materials, and particularly relates to an electrolyte and a high-nickel power battery.
Background
The lithium ion battery has the characteristics of high energy density, high power density, good cycle performance, no memory effect, environmental protection and the like, is widely applied to various electronic products such as mobile phones, mobile cameras, notebook computers, mobile phones and the like, and is also a strong candidate in energy supply systems of future electric automobiles. The chain organic solvent used in the lithium battery electrolyte is usually dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, propyl methyl carbonate and the like and a mixture of two or more of the above, and the lithium salt used is usually: lithium hexafluorophosphate, lithium perchlorate, lithium tetrafluoroborate, lithium dioxalate borate, lithium trifluoromethanesulfonate, lithium bis fluorosulfonylimide and the like and mixtures of two or more thereof. Since lithium hexafluorophosphate is easily decomposed, the decomposition rate of the lithium salt is further increased particularly in the presence of a small amount of moisture in the nonaqueous electrolytic solution. The high-temperature use environment of the lithium battery can promote the HF content of the electrolyte to be remarkably increased, and the HF can damage SEI films on the surfaces of the anode and the cathode of the lithium battery, so that the electrochemical performance of the lithium battery is seriously influenced.
With the expansion of the application field of the lithium battery, particularly the rapid development of electric automobiles, the market puts forward high energy density requirements on the performance of power batteries, and the energy density of a single battery reaches 300wh/kg in 2020. To achieve this goal, the positive and negative electrode materials need to further increase the capacity, and the positive electrode material mainly increases the discharge capacity by increasing the nickel content and increasing the charge cut-off potential. Meanwhile, under a high voltage condition, the electrolyte can generate an oxidation reaction on the surface of the anode material, so that the cycle performance of the material and the battery is poor, and particularly, under a high temperature condition, the oxidation reaction of the electrolyte can be further aggravated. It should be noted that, in the current stage, the cycle performance and high-temperature shelf performance of the battery are mainly improved by adjusting the electrolyte additive for the ternary cathode material, for example, in chinese patent publication nos. CN105591158A and CN105355970A, only the high-temperature storage performance of the ternary battery can be improved by adjusting the type and proportion of the additive. Publication No. CN104617333A was prepared by using additives: the combination method of the methanesulfonic anhydride and the vinylene carbonate ensures that the battery has good cycle characteristics, low-temperature performance and high-temperature storage performance.
The publication No. CN105428719A shows that the cycle life and the high-temperature performance of the ternary wide-temperature lithium ion battery can be effectively improved when the electrolyte prepared by the method is applied to the lithium ion battery made of the lithium cobaltate anode material, but the high-temperature cycle performance of the ternary wide-temperature lithium ion battery is still to be improved when the electrolyte is applied to a high-nickel power battery.
Disclosure of Invention
The invention aims to provide an electrolyte which is suitable for a high-nickel power battery and can improve the high-temperature cycle performance of the high-nickel power battery.
In order to achieve the purpose, the invention adopts the technical scheme that:
an object of the present invention is to provide an electrolyte comprising a lithium salt, an organic solvent and an additive, the organic solvent comprising a mixture of a non-fluorinated cyclic ester and a fluorine-containing chain ester; the additive is additive A and/or additive B, and the combination of other additives;
wherein, the fluorine-containing chain ester is one or more selected from the substances shown in the following structural general formula:
Figure BDA0001975539800000021
wherein R is1、R2Independently an alkyl or alkoxy group having 1 to 3 carbon atoms which is unsubstituted or substituted with a fluorine atom, and R1、R2At least one of the alkyl groups is an alkyl group having 1 to 3 carbon atoms substituted by fluorine atoms, wherein the substitution by fluorine atoms is partial or complete;
the additive A is selected from one or more of the substances shown in the following structural general formula:
Figure BDA0001975539800000022
wherein R is3Is- (CH)2)n-or- (CH)2)nO-and n is an integer of 1-4;
the additive B is selected from one or more of the substances shown in the following structural general formula:
Figure BDA0001975539800000023
wherein R is4、R5Independently selected from one of methoxy, ethoxy, propoxy and butoxy;
the other additives are one or more selected from biphenyl, vinylene carbonate, ethylene carbonate, fluoroethylene carbonate, cyclohexylbenzene, tert-butyl benzene, succinonitrile, lithium bis-fluorosulfonyl imide, ethylene sulfite and lithium difluorophosphate.
Preferably, the non-fluorinated cyclic ester is one or more selected from ethylene carbonate, propylene carbonate, butylene carbonate, gamma-butyrolactone, gamma-valerolactone, -valerolactone and-caprolactone.
Preferably, the fluorine-containing chain ester is one or more selected from the following substances shown in the structural formula:
Figure BDA0001975539800000031
preferably, the organic solvent is a mixed solvent of ethylene carbonate and ethyl fluoroacetate, or a mixed solvent of ethylene carbonate and ethyl difluoroacetate.
Preferably, the non-fluorinated cyclic carbonate accounts for 5-50% of the total mass of the organic solvent, and the fluorine-containing chain ester accounts for 50-95% of the total mass of the organic solvent.
More preferably, the non-fluorinated cyclic carbonate accounts for 10 to 40% of the total mass of the organic solvent, and the fluorine-containing chain ester accounts for 60 to 90% of the total mass of the organic solvent.
More preferably, the non-fluorinated cyclic carbonate accounts for 20 to 40% of the total mass of the organic solvent, and the fluorine-containing chain ester accounts for 60 to 80% of the total mass of the organic solvent.
Most preferably, the non-fluorinated cyclic carbonate accounts for 25 to 35 percent of the total mass of the organic solvent, and the fluorine-containing chain ester accounts for 65 to 75 percent of the total mass of the organic solvent.
Preferably, the feeding mass of the additive A and/or the additive B accounts for 0.1-10% of the total mass of the electrolyte, and the feeding mass of the other additives accounts for 0.1-10% of the total mass of the electrolyte.
More preferably, the feeding mass of the additive A and/or the additive B accounts for 0.1-5% of the total mass of the electrolyte, and the feeding mass of the other additives accounts for 0.1-5% of the total mass of the electrolyte.
More preferably, the feeding mass of the additive A and/or the additive B accounts for 0.5-2% of the total mass of the electrolyte, and the feeding mass of the other additives accounts for 0.5-2% of the total mass of the electrolyte.
Most preferably, the feeding mass of the additive A and/or the additive B accounts for 0.5-1.5% of the total mass of the electrolyte, and the feeding mass of the other additives accounts for 0.5-1% of the total mass of the electrolyte.
Preferably, the additive A is one or more selected from propylene sulfite, butylene sulfite, 1, 3-propane sultone and vinyl sulfate.
According to a preferred embodiment of the invention, the additive is a combination of 1, 3-propane sultone and vinylene carbonate, or a combination of vinyl sulfate and vinylene carbonate, or a combination of 1, 3-propane sultone and lithium bis (fluorosulfonyl) imide, or a combination of vinyl sulfate and lithium bis (fluorosulfonyl) imide, or a combination of 1, 3-propane sultone and lithium difluorophosphate, or a combination of vinyl sulfate and lithium difluorophosphate.
Preferably, the molar concentration of the lithium salt is 0.001-2 mol/L.
More preferably, the molar concentration of the lithium salt is 0.1-2 mol/L.
More preferably, the molar concentration of the lithium salt is 0.5-1.5 mol/L.
Preferably, the lithium salt is selected from LiBF4、LiPF6、LiAsF6、LiClO4、LiN(SO2F)2、LiN(SO2CF3)2、LiN(SO2C2F5)2、LiSO3CF3、LiC2O4BC2O4、LiFC6F5BC2O4、Li2PO2F2One or more of LiBOB and LiODFB.
Further preferably, the lithium salt is selected from LiPF6、LiN(SO2F)2、Li2PO2F2One or more of LiBOB and LiODFB.
The invention also aims to provide a high-nickel power battery, which adopts the electrolyte, wherein the percentage of the mass of nickel of the high-nickel power battery to the total mass of the positive electrode material of the high-nickel power battery is more than or equal to 30%.
Preferably, the positive electrode material of the high-nickel power battery is LiNixAyBZO2Wherein A, B is one of Co, Mn, Al, Fe, V, Mg, Sr, Ti, Ca, Zr, Zn and Si, X + y + z is 1, X is not less than 0.5, and y is not less than 0 and not more than 00.5, and z is more than or equal to 0 and less than or equal to 0.5; the negative electrode material is one of a carbon material, an alloy material, a metal material, a carbon-silicon material, a silicon oxycarbide material, a carbon-tin material and a tin oxycarbide material.
Further preferably, the negative electrode material is one of artificial graphite, natural graphite, mesocarbon microbeads, hard carbon and soft carbon.
When the electrolyte is applied to a high-nickel (Ni content is more than or equal to 30%) power battery, an additive in the electrolyte can form an effective and stable SEI film on the surfaces of a positive electrode material and a negative electrode material, and the SEI film formed by the additive mainly comprises an inorganic compound, so that the cyclicity of the high-nickel (Ni content is more than or equal to 30%) power battery under a high-temperature condition can be effectively improved, and the gas production rate of a lithium battery in a cycle process is inhibited. Meanwhile, the cyclic solvent in the electrolyte can effectively form solvated lithium ions with lithium salt; the fluorine-containing chain solvent has low reaction activity, and when the oxidation potential of the anode material is higher than 4.2V, the anode material is not easy to generate oxidation reaction and electrochemical reaction with the surface of the anode material, so that the stability of the electrolyte solvent is ensured.
The voltage range in the invention refers to that the positive electrode material, the conductive carbon and the binder are mixed according to the mass ratio of 90:1.5:3.5, coated on the aluminum foil, kept for 24 hours in vacuum at 120 ℃, then used as a working electrode, a three-electrode assembled by using metal lithium as a counter electrode and a reference electrode is immersed in the nonaqueous electrolyte, and the voltage is increased to 4.3V (vs. Li) at the scanning rate of +1mV/s+Li); however, the voltage was dropped to 3.0V at a scan rate of-1 mV/s. After the positive electrode material, the negative electrode graphite material, the diaphragm and the electrolyte are assembled into the full battery, the voltage value of the battery is<4.3V. The battery appearance is not limited to a pouch, a square, a cylinder, and the like.
The high nickel in the invention means that the mass content of nickel in the anode material is more than or equal to 30 percent, mainly aiming at improving the discharge specific capacity of the material and meeting the use requirement of a high-energy density power battery.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
the invention improves the electrochemical performance of the high-nickel power battery, especially the high-temperature cycle performance, and inhibits the gas production of the battery under the high-temperature condition through the synergistic effect of the organic solvent and the additive.
Detailed Description
The present application will be described in detail with reference to examples, but the present application is not limited to these examples. In this specification, "%" represents mass% and ratios represent mass ratios, unless otherwise specified.
The preparation process of the battery comprises the following steps: LiNi in mass ratio0.5Co0.2Mn0.3O2: polyvinylidene fluoride (PVDF) and conductive carbon SP (95: 3.5: 1.5) are added into NMP and evenly stirred to form slurry, the slurry is coated on an aluminum foil current collector on a coating machine, and the positive electrode plate is prepared by drying at 120 ℃, rolling and cutting. Adding artificial graphite, sodium carboxymethylcellulose (CMC) and Styrene Butadiene Rubber (SBR) into secondary water in a mass ratio of 95:3:2 by the same process, uniformly stirring to form slurry, coating the slurry on a copper foil current collector on a coating machine, drying at 120 ℃, rolling and cutting to obtain the negative electrode plate. And winding the positive plate, the negative plate and the PP diaphragm into a battery cell, then packaging the battery cell into an aluminum plastic film, and sealing the edges. And after vacuum drying, injecting liquid and sealing to obtain the soft-package polymer lithium ion battery.
And (3) testing the high temperature of the battery: the assembled battery is firstly formed under the following conditions: charging to 4.2V at constant current of 0.1C, charging at constant voltage of 4.2V for 2h, standing for 10min, and discharging to 3.0V at constant current of 0.2C. The test conditions of the high-temperature cycle performance of the lithium ion battery are as follows: charging to 4.2V at a constant current of 1C at a high temperature of 55 ℃, charging for 2h at a constant voltage of 4.2V, standing for 10min, discharging to 3.0V at a constant current of 1C, and standing for 10 min.
Examples 1 to 7 and comparative examples 1 to 2
Preparing an electrolyte: 30% Ethylene Carbonate (EC), 70% ethyl fluoroacetate (EFA; CAS:459-72-3) or 70% Ethyl Methyl Carbonate (EMC) were each used in the mass ratios shown in Table 1. And (3) fully and uniformly mixing in a glove box with the humidity of less than 1% to prepare an electrolyte solvent. Then, an electrolyte salt LiPF was added in portions in a total amount of 1mol/L6Adding ethylene carbonate with different contents when the electrolyte salt is fully dissolvedEsters (VC) and 1, 3-Propane Sultone (PS) or vinyl sulfate (DTD); standing for 24 hours; thus, electrolytes of examples 1 to 7 and comparative examples 1 to 2 were obtained.
Table 1 below shows high temperature cycle performance data at 55 c obtained by testing the batteries using the electrolytes of examples 1 to 7 and comparative examples 1 to 2 under the above test conditions for high temperature cycle performance.
TABLE 1
Figure BDA0001975539800000061
Figure BDA0001975539800000071
Examples 8 to 14 and comparative examples 3 to 4
Preparing an electrolyte: 30% Ethylene Carbonate (EC), 70% ethyl difluoroacetate (abbreviated: DFAE; CAS:454-31-9) or 70% Ethyl Methyl Carbonate (EMC) were each used in the weight ratios shown in Table 2. And (3) fully and uniformly mixing in a glove box with the humidity of less than 1% to prepare an electrolyte solvent. Then, an electrolyte salt LiPF was added in portions in a total amount of 1mol/L6When the electrolyte salt is fully dissolved, Vinylene Carbonate (VC) and 1, 3-Propane Sultone (PS) or vinyl sulfate (DTD) with different contents are added; standing for 24 hours; thus, electrolytes of examples 8 to 14 and comparative examples 3 to 4 were obtained.
Table 2 below shows high temperature cycle performance data at 55 c obtained by testing the batteries using the electrolytes of examples 8 to 14 and comparative examples 3 to 4 under the above-mentioned high temperature cycle performance test conditions.
TABLE 2
Figure BDA0001975539800000072
Figure BDA0001975539800000081
Examples 15 to 21 and comparative examples 5 to 6
Preparing an electrolyte: weights according to Table 3The Ethylene Carbonate (EC) was 30%, ethyl fluoroacetate (EFA; CAS:459-72-3) was 70%, and Ethyl Methyl Carbonate (EMC) was 70%. And (3) fully and uniformly mixing in a glove box with the humidity of less than 1% to prepare an electrolyte solvent. Then, an electrolyte salt LiPF was added in portions in a total amount of 1mol/L6When the electrolyte salt is fully dissolved, lithium difluorophosphate (LiPO) with different contents is added2F2) And 1, 3-Propane Sultone (PS) or vinyl sulfate (DTD); standing for 24 hours; thus, electrolytes of examples 15 to 21 and comparative examples 5 to 6 were obtained.
Table 3 below is high temperature cycle performance data at 55 c obtained by testing the batteries of the electrolytes of examples 15 to 21 and comparative examples 5 to 6 under the above high temperature cycle performance test conditions.
TABLE 3
Figure BDA0001975539800000082
Figure BDA0001975539800000091
Examples 22 to 28 and comparative examples 7 to 8
Preparing an electrolyte: 30% Ethylene Carbonate (EC), 70% ethyl difluoroacetate (abbreviated: DFAE; CAS:454-31-9) or 70% Ethyl Methyl Carbonate (EMC) were each used in the weight ratios shown in Table 4. And (3) fully and uniformly mixing in a glove box with the humidity of less than 1% to prepare an electrolyte solvent. Then, an electrolyte salt LiPF was added in portions in a total amount of 1mol/L6When the electrolyte salt is fully dissolved, lithium difluorophosphate (LiPO2F2) and 1, 3-Propane Sultone (PS) or vinyl sulfate (DTD) with different contents are added; standing for 24 hours; thus obtaining electrolytes of examples 22 to 28 and comparative examples 7 to 8;
table 4 below is the high temperature cycle performance data at 55 c obtained from the cells of the electrolytes of examples 22-28 and comparative examples 7-8 tested according to the above high temperature cycle performance test conditions.
TABLE 4
Figure BDA0001975539800000092
Figure BDA0001975539800000101
Comparative examples 9 to 17
Preparing an electrolyte: 30% Ethylene Carbonate (EC), ethyl trifluoroacetate (TFAE: CAS:383-63-1) and Ethyl Methyl Carbonate (EMC) were taken in different proportions by weight in Table 5, respectively. And (3) fully and uniformly mixing in a glove box with the humidity of less than 1% to prepare an electrolyte solvent. Then, an electrolyte salt LiPF was added in portions in a total amount of 1mol/L6When the electrolyte salt is fully dissolved, lithium difluorophosphate (LiPO2F2) and 1, 3-Propane Sultone (PS) or vinyl sulfate (DTD) with different contents are added; standing for 24 hours; thus obtaining the electrolyte of comparative examples 9-17;
table 5 below is the high temperature cycle performance data at 55 c obtained from the cells of the electrolytes of comparative examples 9-17 tested according to the high temperature cycle performance test conditions described above.
TABLE 5
Figure BDA0001975539800000102
Figure BDA0001975539800000111
Through the test experiments, the high-nickel ternary cathode material battery adopting the electrolyte can normally work in a voltage range below 4.3V, and particularly has the cyclicity under the high-temperature condition.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.

Claims (10)

1. An electrolyte comprising a lithium salt, an organic solvent and an additive, wherein: the organic solvent comprises a mixture of non-fluorinated cyclic ester and fluorine-containing chain ester; the additive is additive A and/or additive B, and the combination of other additives;
wherein, the fluorine-containing chain ester is one or more selected from the substances shown in the following structural general formula:
Figure FDA0001975539790000011
wherein R is1、R2Independently an alkyl or alkoxy group having 1 to 3 carbon atoms which is unsubstituted or substituted with a fluorine atom, and R1、R2At least one of the alkyl groups is an alkyl group having 1 to 3 carbon atoms substituted by fluorine atoms, wherein the substitution by fluorine atoms is partial or complete;
the additive A is selected from one or more of the substances shown in the following structural general formula:
Figure FDA0001975539790000012
wherein R is3Is- (CH)2)n-or- (CH)2)nO-and n is an integer of 1-4;
the additive B is selected from one or more of the substances shown in the following structural general formula:
Figure FDA0001975539790000013
wherein R is4、R5Independently selected from one of methoxy, ethoxy, propoxy and butoxy;
the other additives are one or more selected from biphenyl, vinylene carbonate, ethylene carbonate, fluoroethylene carbonate, cyclohexylbenzene, tert-butyl benzene, succinonitrile, lithium bis-fluorosulfonyl imide, ethylene sulfite and lithium difluorophosphate.
2. The electrolyte of claim 1, wherein: the non-fluorinated cyclic ester is one or more selected from ethylene carbonate, propylene carbonate, butylene carbonate, gamma-butyrolactone, gamma-valerolactone, valerolactone and caprolactone.
3. The electrolyte of claim 1, wherein: the fluorine-containing chain ester is one or more selected from the following substances shown in the structural formula:
Figure FDA0001975539790000021
4. the electrolyte of any one of claims 1 to 3, wherein: the organic solvent is a mixed solvent of ethylene carbonate and ethyl fluoroacetate, or a mixed solvent of ethylene carbonate and ethyl difluoroacetate.
5. The electrolyte of any one of claims 1 to 3, wherein: the non-fluorinated cyclic carbonate accounts for 5-50% of the total mass of the organic solvent, and the fluorine-containing chain ester accounts for 50-95% of the total mass of the organic solvent.
6. The electrolyte of claim 1, wherein: the feeding mass of the additive A and/or the additive B accounts for 0.1-10% of the total mass of the electrolyte, and the feeding mass of other additives accounts for 0.1-10% of the total mass of the electrolyte.
7. The electrolyte of claim 1, wherein: the additive A is one or more selected from propylene sulfite, butylene sulfite, 1, 3-propane sultone and vinyl sulfate.
8. A high nickel power battery is characterized in that: the electrolyte is adopted according to any one of claims 1 to 7, wherein the percentage of the mass of nickel of the high-nickel power battery to the total mass of the positive electrode material of the high-nickel power battery is more than or equal to 30%.
9. The high nickel power cell of claim 8, wherein: the positive electrode material of the high-nickel power battery is LiNixAyBZO2Wherein A, B is one of Co, Mn, Al, Fe, V, Mg, Sr, Ti, Ca, Zr, Zn and Si, X + y + z is 1, X is not less than 0.5, y is not less than 0 and not more than 0.5, and z is not less than 0 and not more than 0.5; the negative electrode material is one of a carbon material, an alloy material, a metal material, a carbon-silicon material, a silicon oxycarbide material, a carbon-tin material and a tin oxycarbide material.
10. The high nickel power cell of claim 9, wherein: the negative electrode material is one of artificial graphite, natural graphite, mesocarbon microbeads, hard carbon and soft carbon.
CN201910131595.7A 2019-02-22 2019-02-22 Electrolyte and high-nickel power battery Withdrawn CN111613834A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910131595.7A CN111613834A (en) 2019-02-22 2019-02-22 Electrolyte and high-nickel power battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910131595.7A CN111613834A (en) 2019-02-22 2019-02-22 Electrolyte and high-nickel power battery

Publications (1)

Publication Number Publication Date
CN111613834A true CN111613834A (en) 2020-09-01

Family

ID=72195646

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910131595.7A Withdrawn CN111613834A (en) 2019-02-22 2019-02-22 Electrolyte and high-nickel power battery

Country Status (1)

Country Link
CN (1) CN111613834A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024045788A1 (en) * 2022-08-29 2024-03-07 深圳新宙邦科技股份有限公司 Electrolyte solution with stable performance and secondary battery

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024045788A1 (en) * 2022-08-29 2024-03-07 深圳新宙邦科技股份有限公司 Electrolyte solution with stable performance and secondary battery

Similar Documents

Publication Publication Date Title
CN109873206B (en) Lithium ion battery electrolyte and lithium ion battery
US20190214680A1 (en) Lithium ion battery and electrolytic soluton thereof
EP3972029A1 (en) Lithium secondary battery electrolyte, preparation method therefor and lithium secondary battery
CN111525190B (en) Electrolyte and lithium ion battery
CN112331914A (en) Non-aqueous electrolyte of lithium ion battery without ethylene carbonate solvent and battery
CN111834665B (en) High-nickel ternary lithium ion battery electrolyte and lithium ion battery
CN110911748B (en) Lithium secondary battery electrolyte and lithium secondary battery
CN111883831A (en) Lithium ion battery electrolyte, battery cathode and electrochemical energy storage device
CN110911754B (en) Lithium ion battery electrolyte and preparation method thereof
CN113161615A (en) Non-aqueous electrolyte of lithium ion battery and lithium ion battery
CN109473717B (en) Electrolyte suitable for high-voltage high-nickel power battery and high-voltage high-nickel power battery
CN113130990A (en) Electrolyte and secondary battery using same
CN109786830B (en) Electrolyte containing silicon solvent and thiophene additive and lithium ion battery using electrolyte
CN113809401A (en) Non-aqueous electrolyte of lithium ion battery and application thereof
CN114039094A (en) Non-aqueous electrolyte of lithium ion battery and lithium ion battery
CN111883834B (en) Non-aqueous lithium ion battery electrolyte additive, electrolyte containing non-aqueous lithium ion battery electrolyte additive and lithium ion battery
CN114520371B (en) Nonaqueous electrolyte and lithium ion battery comprising same
CN111613834A (en) Electrolyte and high-nickel power battery
CN111146497B (en) Additive for battery electrolyte, lithium ion battery electrolyte and lithium ion battery
CN112786966A (en) Electrolyte and lithium ion battery
CN112331916A (en) Electrolyte and application thereof
CN112993398B (en) Lithium ion battery electrolyte and lithium battery
CN111952667A (en) Electrolyte additive, electrolyte containing additive and lithium ion battery
CN112582672A (en) Ternary lithium ion battery non-aqueous electrolyte and ternary lithium ion battery containing same
CN112310475A (en) Lithium ion battery non-aqueous electrolyte and lithium ion battery

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WW01 Invention patent application withdrawn after publication
WW01 Invention patent application withdrawn after publication

Application publication date: 20200901