CN112290090A - High-nickel ternary lithium ion battery non-aqueous electrolyte and battery containing electrolyte - Google Patents
High-nickel ternary lithium ion battery non-aqueous electrolyte and battery containing electrolyte 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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- 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
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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
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic 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
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- 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 belongs to the technical field of lithium ion batteries, and discloses a high-nickel ternary lithium ion battery non-aqueous electrolyte and a battery containing the electrolyte. The high-nickel ternary lithium ion battery non-aqueous electrolyte comprises electrolyte lithium salt, a non-aqueous organic solvent and a film-forming additive, wherein the film-forming additive contains a phosphorus-based compound. The phosphorus-based compound in the high-nickel ternary lithium ion battery non-aqueous electrolyte can be polymerized on the surface of the anode material to form a conductive passivation film, the film improves the stability of the anode material under the conditions of high temperature and high voltage, and prevents the electrolyte from further oxidative decomposition, thereby improving the normal-temperature cycle performance, the high-temperature cycle performance and the high-temperature storage performance of the lithium ion battery.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a high-nickel ternary lithium ion battery non-aqueous electrolyte and a battery containing the electrolyte.
Background
Lithium ion batteries are widely used in digital 3C products such as mobile phones, cameras, notebook computers and the like due to their advantages of light weight, small size, high energy density, long cycle life, large output power, small environmental pollution and the like.
In the process of high-temperature charge-discharge circulation and high-temperature storage of the lithium ion battery, oxidative decomposition reaction on the surface of the anode material of the electrolyte is aggravated, and oxidative decomposition products of the electrolyte are continuously deposited on the surface of the anode, so that the impedance on the surface of the anode is continuously increased, and the performance of the battery is attenuated. Particularly, when the nickel content in the ternary cathode material is relatively high, the surface activity of the cathode material is higher, and the decomposition of the electrolyte is more serious.
In addition, the dissolution of metal ions of the positive electrode material is further accelerated by increasing the charging voltage of the lithium ion battery, and the dissolved metal ions not only catalyze the further decomposition of the electrolyte, but also destroy an SEI (solid electrolyte interphase) passivation layer of the negative electrode. Particularly, during long-term high-temperature storage or high-temperature cycles, the elution of positive electrode metal ions is more serious, resulting in rapid degradation of the performance of the battery.
In order to suppress the degradation of battery performance due to the elution of the positive electrode metal ions and the decomposition of the electrolyte, a positive and negative electrode film-forming additive may be added to the electrolyte. Currently commercialized film-forming additives, such as ethylene carbonate (VC), can improve the cycle performance of a battery, and in order to improve the cycle life of the battery, a higher amount of the VC is often required to be added, but excessive VC can improve the cycle life of the battery, and also can cause gassing and ballooning of the battery during high-temperature storage, and excessive VC can increase the impedance of the battery interface, resulting in degradation of the low-temperature performance of the battery.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provide a high-nickel ternary lithium ion battery non-aqueous electrolyte and a battery containing the electrolyte. The phosphorus additive in the non-aqueous electrolyte of the high-nickel ternary lithium ion battery can be polymerized on the surface of the anode material to form a conductive passivation film, the film improves the stability of the anode material under the conditions of high temperature and high voltage, and prevents the electrolyte from further oxidative decomposition, thereby improving the normal-temperature cycle performance, the high-temperature cycle performance and the high-temperature storage performance of the lithium ion battery.
In order to achieve the purpose of the invention, the high-nickel ternary lithium ion battery nonaqueous electrolyte comprises electrolyte lithium salt, a nonaqueous organic solvent and a film-forming additive, wherein the film-forming additive contains a phosphorus-based compound shown in a structure of a formula (I):
wherein R is1Is phosphorus, R2The fluorine-containing alkyl is selected from alkyl, alkenyl, alkynyl, phenyl and fluorine-containing alkyl with 1-4 carbon atoms, wherein the fluorine atom number of the terminal group in the fluorine-containing alkyl is 0-3, and the fluorine atom number of other carbon atoms is 0-2.
Preferably, the mass of the film forming additive accounts for 0.5-5.0% of the total mass of the electrolyte.
Preferably, the phosphorus-based compound having the structure of formula (i) includes, but is not limited to, one or more of compounds 1-3:
preferably, the mass of the phosphorus-based compound represented by the formula (I) accounts for 0.5-1.0% of the total mass of the electrolyte.
As a further improvement of the present invention, the film forming additive further contains a negative electrode film forming additive, and the negative electrode film forming additive is selected from one or more of Vinylene Carbonate (VC), fluoroethylene carbonate (FEC), Vinyl Ethylene Carbonate (VEC), 1, 3-Propane Sultone (PS), vinyl sulfate (DTD), 1, 3-propane sultone (1,3-PST), vinyl sulfite (ES), tris (trimethylsilane) phosphate (TMSP), tris (trimethylsilane) borate (TMSB), and Methylene Methanedisulfonate (MMDS).
According to some embodiments of the present invention, the film forming additive further contains vinylene carbonate accounting for 0.5% of the total mass of the electrolyte and 1, 3-propane sultone accounting for 0.5% of the total mass of the electrolyte.
According to some embodiments of the present invention, it is further preferable that the film forming additive further contains vinylene carbonate accounting for 0.5% of the total mass of the electrolyte, 1, 3-propane sultone accounting for 0.5% of the total mass of the electrolyte, and vinyl sulfate accounting for 2.0% of the total mass of the electrolyte.
According to some embodiments of the present invention, it is further preferable that the film forming additive further contains vinylene carbonate accounting for 0.5% of the total mass of the electrolyte, 1, 3-propane sultone accounting for 0.5% of the total mass of the electrolyte, vinyl sulfate accounting for 2.0% of the total mass of the electrolyte, and tris (trimethylsilane) borate accounting for 0.5% of the total mass of the electrolyte.
In the invention, the electrolyte lithium salt is a mixed lithium salt of at least two of lithium hexafluorophosphate, lithium bis-fluorosulfonyl imide and lithium difluorophosphate; preferably, the addition amount of the electrolyte lithium salt is 13.0-16.5% of the total mass of the electrolyte.
Further preferably, the electrolyte lithium salt is a mixed lithium salt of lithium hexafluorophosphate and lithium bis (fluorosulfonyl) imide, or a mixed lithium salt of lithium hexafluorophosphate, lithium bis (fluorosulfonyl) imide and lithium difluorophosphate; more preferably, the electrolyte lithium salt is a mixed lithium salt of lithium hexafluorophosphate accounting for 13.5% of the total mass of the electrolyte and lithium bis (fluorosulfonyl) imide accounting for 0.5% of the total mass of the electrolyte, or a mixed lithium salt of lithium hexafluorophosphate accounting for 13.5% of the total mass of the electrolyte, lithium bis (fluorosulfonyl) imide accounting for 0.5% of the total mass of the electrolyte and lithium difluorophosphate accounting for 2.0% of the total mass of the electrolyte.
In the present invention, the non-aqueous organic solvent includes a cyclic carbonate selected from one or more of Ethylene Carbonate (EC) and Propylene Carbonate (PC), and a chain carbonate selected from one or more of dimethyl carbonate (DMC), diethyl carbonate (DEC), Ethyl Methyl Carbonate (EMC), bis (2,2, 2-trifluoroethyl) carbonate, and methyltrifluoroethyl carbonate; preferably, the addition amount of the cyclic carbonate accounts for 20.0-45.0% of the total mass of the electrolyte, wherein the addition amount of the propylene carbonate accounts for 5.0-20.0% of the total mass of the electrolyte.
Further preferably, the non-aqueous organic solvent comprises ethylene carbonate, propylene carbonate, diethyl carbonate and ethyl methyl carbonate; more preferably, the ethylene carbonate, the propylene carbonate, the diethyl carbonate and the ethyl methyl carbonate are in the mass ratio of EC: PC: DEC: EMC 20: 5: 20: 55 are mixed.
On the other hand, the invention also provides a high-nickel ternary lithium ion battery, which comprises a negative plate, a positive plate, an isolating membrane arranged between the negative plate and the positive plate and the high-nickel ternary lithium ion battery electrolyte.
Further, the negative plate comprises an aluminum foil current collector and a negative membrane, and the positive plate comprises a copper foil current collector and a positive membrane.
Preferably, the negative electrode diaphragm includes a negative electrode active material, a conductive agent, and a binder, and the positive electrode diaphragm includes a positive electrode active material, a conductive agent, and a binder.
More preferably, the negative electrode active material is LiNi1-x-y-zCoxMnyAlzO2Wherein: x is more than or equal to 0 and less than or equal to 1, y is more than or equal to 0 and less than or equal to 1, z is more than or equal to 0 and less than or equal to 1, m is more than or equal to 0 and less than or equal to 1, n is more than or equal to 0 and less than or equal to 1, and x + y + z is more than or equal to 0 and less than or equal to 1, 35.
Advantages of the present invention include, but are not limited to:
(1) according to the invention, the negative electrode film forming additive (especially vinyl sulfate) is reduced on the surface of the negative electrode material in preference to the solvent, so that an excellent interface protective film is formed, and the reaction of the electrode material and the electrolyte is reduced; meanwhile, the formed solid electrolyte membrane has low impedance, which is beneficial to improving the internal dynamic characteristics of the lithium ion battery;
(2) the phosphorus additive with the structure shown in the formula (I) can form an interface protective film on the surface of a positive electrode material, reduce the oxidative decomposition of electrolyte, inhibit the dissolution of metal ions of the positive electrode, and is beneficial to improving the high-temperature cycle performance and the high-temperature storage performance of a battery.
(3) A passivation film formed by the phosphorus compound of the present inventionThe impedance is high, and the damage to the electrochemical performance of the battery is large, so that the invention also adds the novel conductive lithium salt lithium bifluorosulfonyl imide and lithium difluorophosphate with low impedance characteristic, compared with the single use of LiPF6And various novel film-forming lithium salts are combined for use, so that the high-low temperature performance, the rate capability and the long cycle performance of the power battery are improved.
Drawings
FIG. 1 is a graph of AC impedances in examples 1-3 and comparative example 1, where blank indicates that no phosphorus-based compound was added, corresponding to comparative example 1.
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. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention. It is to be understood that the following description is only illustrative of the present invention and is not to be construed as limiting the present invention.
The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
The indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the number clearly indicates the singular.
Furthermore, the description below of the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily for the same embodiment or example. Further, the technical features of the embodiments of the present invention may be combined with each other as long as they do not conflict with each other.
Example 1
The positive electrode preparation step, the negative electrode preparation step, the electrolyte preparation step, the separator preparation step, and the battery production step are explained below. Wherein the positive electrode active material is LiNi0.6Co0.2Mn0.2O; the negative active material is artificial graphite, and the coating surface density is determined according to the size, the capacity design and the capacities of the positive and negative electrode materials.
The preparation steps of the anode are as follows: weighing active substance (LiNi)0.6Co0.2Mn0.2And O), adding the mixture, polyvinylidene fluoride (PVDF) and conductive carbon black (Super-P) into an N-methylpyrrolidone (NMP) solvent according to the mass ratio of 97:1:2, mixing, stirring to obtain slurry, uniformly coating the slurry on two sides of an aluminum foil on a coating machine, drying, cooling and splitting to obtain the positive plate.
The preparation steps of the negative electrode are as follows: mixing graphite, conductive carbon black and Styrene Butadiene Rubber (SBR) according to a mass ratio of 92:1.5:1.5:1, dispersing in deionized water to obtain negative electrode slurry, uniformly coating the negative electrode slurry on two surfaces of an aluminum foil on a coating machine, drying, cold flat pressing and slitting to obtain the negative electrode sheet.
The diaphragm adopts a PP/PE/PP three-layer double-check diaphragm.
Preparing electrolyte: in a glove box (H) filled with argon2O＜0.1ppm，O2Less than 0.1ppm), taking ethylene carbonate, propylene carbonate, diethyl carbonate and ethyl methyl carbonate as EC: PC: DEC: EMC 20: 5: 20: 55, slowly adding 13.5 wt% of lithium hexafluorophosphate based on the total weight of the electrolyte into the mixed solution, finally adding 0.5 wt% of phosphorus compound (compound 1) shown in the formula (I) based on the total weight of the electrolyte, and uniformly stirring to obtain the lithium ion battery electrolyte of the example 1.
Preparing a lithium ion battery: stacking the prepared positive plate, the diaphragm and the negative plate in sequence, enabling the diaphragm to be positioned between the positive plate and the negative plate, and winding to obtain a bare cell; placing the bare cell in an aluminum plastic film outer package, and injecting the prepared lithium ion power battery electrolyte into the fully dried artificial graphite material
/LiNi0.6Co0.2Mn0.2O2In the battery, the battery is subjected to conventional capacity grading after standing at 45 ℃, high-temperature clamp formation and secondary sealing.
Examples 2 to 8 and comparative examples 1 to 7
As shown in Table 1, examples 2 to 8 and comparative examples 1 to 7 were the same as example 1 except that the components of the electrolyte were added in the proportions shown in Table 1.
TABLE 1 composition ratios of the components of the electrolytes of examples 1-8 and comparative examples 1-7
Effects of the embodiment
1) And (3) testing the normal-temperature cycle performance of the battery: and (3) charging the battery with the capacity divided to 4.35V at a constant current and a constant voltage of 1C and stopping the current at 0.05C at 25 ℃, then discharging the battery to 3.0V at a constant current of 1C, and calculating the capacity retention rate of the 1000 th cycle after 1000 cycles of cycle of charge/discharge according to the cycle. The calculation formula is as follows:
the 1000 th cycle capacity retention ratio (%) (1000 th cycle discharge capacity/first cycle discharge capacity) × 100%.
2) And (3) testing the thickness expansion and capacity residual rate and capacity recovery rate at constant temperature of 60 ℃: firstly, the battery is placed at normal temperature and is circularly charged and discharged for 1 time (4.35V-3.0V) at 0.5C, and the discharge capacity C before the battery is stored is recorded0Then the battery is charged to 4.35V full-voltage by constant current and constant voltage, and the thickness d of the battery before high-temperature storage is tested by using a vernier caliper1(the two diagonals of the battery are respectively connected through a straight line, and the intersection point of the two diagonals is a battery thickness test point), then the battery is placed in a 60 ℃ incubator for storage for 7 days, and after the storage is finished, the battery is taken out and the thermal thickness d of the stored battery is tested2Calculating the expansion rate of the thickness of the battery after the battery is stored for 7 days at a constant temperature of 60 ℃; after the battery is cooled for 24 hours at room temperature, the battery is discharged to 3.0V at constant current of 0.5C again, and the discharge capacity C after the battery is stored is recorded1And calculating the capacity residual rate of the battery after 7 days of constant temperature storage at 60 ℃, performing constant current and constant voltage charging on the battery to 4.35V at 0.5C, performing constant current discharging on the battery to 3.0V at 0.5C, and recording the discharge capacity C of the battery2And calculating the capacity recovery rate of the battery after 7 days of constant-temperature storage at 60 ℃, wherein the calculation formula is as follows:
thickness expansion rate of battery after 7 days of storage at 60 ═ d2-d1)/d1*100％；
The residual capacity rate after 7 days of constant temperature storage at 60 ℃ is C1/C0*100％；
The capacity recovery rate after 7 days of constant temperature storage at 60 ℃ is C2/C0*100％。
3) And (3) testing the 45 ℃ cycle performance of the battery: at the temperature of 45 ℃, the battery after capacity grading is charged to 4.35V at constant current and constant voltage according to 1C, the current is cut off at 0.05C, then the battery is discharged to 3.0V at constant current according to 1C, and according to the circulation, the capacity retention rate of the 800 th cycle is calculated after 800 cycles of charge/discharge, and the calculation formula is as follows:
the 800 th cycle capacity retention (%) was (800 th cycle discharge capacity/first cycle discharge capacity) × 100%;
table 2 results of electrical property test of batteries in examples 1 to 8 and comparative examples 1 to 7
The comparison of the electrical performance test results of comparative examples 1 and 5 to 6 with examples 1 to 4 and 6 in Table 2 shows that: the phosphorus additive can obviously improve the cycle performance of the battery, and the capacity retention rate and recovery rate after high-temperature storage, and can be presumed to form a layer of uniform and tough protective film on the active surface of the positive electrode, and the protective film can effectively inhibit the dissolution of metal ions of the positive electrode under the conditions of high temperature and high pressure and inhibit the oxidative decomposition of electrolyte in the cycle process.
The results of the electrical property tests of example 1, comparative examples 2-4 and examples 7-8 in Table 2 show that: the amount of the phosphorus compound 1 added is preferably 0.5 to 1.0%. When the addition amount is too small, the film forming quality of the novel additive on the positive electrode is poor, the electrolyte can still be oxidized and decomposed on the surface of the positive electrode material, and metal ions in the positive electrode material can be dissolved out, so that the electrical property of the battery can not meet the requirement. When the amount of the additive is too large, the impedance of a formed passivation film on the positive electrode material is too large, so that the intercalation and deintercalation of lithium ions are hindered, the concentration difference polarization inside the battery is too large, and the electrochemical performance improvement effect of the invention cannot be achieved.
The results of the electrical property tests of example 1 and examples 4-6 in table 2 are compared to see that: the phosphorus additives used alone cannot completely meet the requirements of the battery on electrical performance, and other types of additives are required to be added, and the additives have interaction and the combined action improves the electrical performance of the battery.
Further, LiPF alone was used as compared with comparative example 76As the conductive lithium salt, the novel conductive lithium salt lithium difluorophosphate with good film forming characteristics is added in the comparative example 6, and the combination of various novel film forming lithium salts effectively improves the cycle performance and the high-temperature storage performance of the battery. However, not all additions of multiple lithium salts to any electrolyte system will serve as 1+1>2, if the components and contents of other additives are the same, the effect of example 6 with two lithium salts is significantly better than that of example 7 with three lithium salts, and the negative effects caused by the addition of three lithium salts can be reduced by increasing the usage amount of the phosphorus-based additive of the present invention.
It will be understood by those skilled in the art that the foregoing is merely exemplary of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The high-nickel ternary lithium ion battery non-aqueous electrolyte comprises electrolyte lithium salt, a non-aqueous organic solvent and a film-forming additive, and is characterized in that the film-forming additive contains a phosphorus-based compound shown in a structure of formula (I):
wherein R is1Is phosphorus, R2The fluorine-containing alkyl is selected from alkyl, alkenyl, alkynyl, phenyl and fluorine-containing alkyl with 1-4 carbon atoms, wherein the fluorine atom number of the terminal group in the fluorine-containing alkyl is 0-3, and the fluorine atom number of other carbon atoms is 0-2.
2. The non-aqueous electrolyte solution for the high-nickel ternary lithium ion battery according to claim 1, wherein the mass of the film-forming additive accounts for 0.5-5.0% of the total mass of the electrolyte solution.
3. The non-aqueous electrolyte solution for the high-nickel ternary lithium ion battery according to claim 1, wherein the phosphorus-based compound having the structure represented by formula (i) comprises one or more compounds 1 to 3:
preferably, the mass of the phosphorus-based compound represented by the formula (I) accounts for 0.5-1.0% of the total mass of the electrolyte.
4. The non-aqueous electrolyte solution for the high-nickel ternary lithium ion battery according to claim 1, wherein the film-forming additive further comprises a negative electrode film-forming additive, and the negative electrode film-forming additive is selected from one or more of vinylene carbonate, fluoroethylene carbonate, vinyl ethylene carbonate, 1, 3-propane sultone, vinyl sulfate, 1, 3-propane sultone, vinyl sulfite, tris (trimethylsilane) phosphate, tris (trimethylsilane) borate and methylene methanedisulfonate; preferably, the film forming additive also contains vinylene carbonate accounting for 0.5 percent of the total mass of the electrolyte and 1, 3-propane sultone accounting for 0.5 percent of the total mass of the electrolyte; more preferably, the film forming additive also contains vinylene carbonate accounting for 0.5 percent of the total mass of the electrolyte, 1, 3-propane sultone accounting for 0.5 percent of the total mass of the electrolyte and vinyl sulfate accounting for 2.0 percent of the total mass of the electrolyte; more preferably, the film forming additive further contains vinylene carbonate accounting for 0.5% of the total mass of the electrolyte, 1, 3-propane sultone accounting for 0.5% of the total mass of the electrolyte, vinyl sulfate accounting for 2.0% of the total mass of the electrolyte, and tris (trimethylsilane) borate accounting for 0.5% of the total mass of the electrolyte.
5. The non-aqueous electrolyte solution for a high-nickel ternary lithium ion battery according to claim 1, wherein the electrolyte lithium salt is a mixed lithium salt of at least two of lithium hexafluorophosphate, lithium bis-fluorosulfonylimide, and lithium difluorophosphate; preferably, the addition amount of the electrolyte lithium salt is 13.0-16.5% of the total mass of the electrolyte.
6. The non-aqueous electrolyte solution for the high-nickel ternary lithium ion battery according to claim 5, wherein the electrolyte lithium salt is a mixed lithium salt of lithium hexafluorophosphate and lithium bis-fluorosulfonylimide, or a mixed lithium salt of lithium hexafluorophosphate, lithium bis-fluorosulfonylimide and lithium difluorophosphate; more preferably, the electrolyte lithium salt is a mixed lithium salt of lithium hexafluorophosphate accounting for 13.5% of the total mass of the electrolyte and lithium bis (fluorosulfonyl) imide accounting for 0.5% of the total mass of the electrolyte, or a mixed lithium salt of lithium hexafluorophosphate accounting for 13.5% of the total mass of the electrolyte, lithium bis (fluorosulfonyl) imide accounting for 0.5% of the total mass of the electrolyte and lithium difluorophosphate accounting for 2.0% of the total mass of the electrolyte.
7. The non-aqueous electrolyte solution for the high-nickel ternary lithium ion battery according to claim 1, wherein the non-aqueous organic solvent comprises a cyclic carbonate and a chain carbonate, the cyclic carbonate is selected from one or more of ethylene carbonate and propylene carbonate, and the chain ester is selected from one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, bis (2,2, 2-trifluoroethyl) carbonate and methyl trifluoroethyl carbonate; preferably, the addition amount of the cyclic carbonate accounts for 20.0-45.0% of the total mass of the electrolyte, wherein the addition amount of the propylene carbonate accounts for 5.0-20.0% of the total mass of the electrolyte; further preferably, the non-aqueous organic solvent comprises ethylene carbonate, propylene carbonate, diethyl carbonate and ethyl methyl carbonate; still further preferably, the ethylene carbonate, propylene carbonate, diethyl carbonate and ethyl methyl carbonate are mixed in a mass ratio of 20: 5: 20: 55 are mixed.
8. A high-nickel ternary lithium ion battery, which is characterized by comprising a negative plate, a positive plate, a separation film arranged between the negative plate and the positive plate and the non-aqueous electrolyte of the high-nickel ternary lithium ion battery as claimed in any one of claims 1 to 7.
9. The high-nickel ternary lithium ion battery according to claim 8, wherein the negative electrode sheet comprises an aluminum foil current collector and a negative electrode membrane sheet, and the positive electrode sheet comprises a copper foil current collector and a positive electrode membrane sheet; preferably, the negative electrode diaphragm includes a negative electrode active material, a conductive agent, and a binder, and the positive electrode diaphragm includes a positive electrode active material, a conductive agent, and a binder.
10. The high-nickel ternary lithium ion battery according to claim 8 or 9, wherein the negative electrode active material is LiNi1-x-y-zCoxMnyAlzO2Wherein: x is more than or equal to 0 and less than or equal to 1, y is more than or equal to 0 and less than or equal to 1, z is more than or equal to 0 and less than or equal to 1, m is more than or equal to 0 and less than or equal to 1, n is more than or equal to 0 and less than or equal to 1, and x + y + z is more than or equal to 0 and less than or equal to 1, 35.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113078357A (en) * | 2021-03-17 | 2021-07-06 | 东莞市杉杉电池材料有限公司 | High-voltage lithium ion battery non-aqueous electrolyte and lithium ion battery |
| CN114335718A (en) * | 2021-11-24 | 2022-04-12 | 惠州市豪鹏科技有限公司 | Non-aqueous electrolyte, preparation method thereof and secondary battery |
| WO2023179338A1 (en) * | 2022-03-21 | 2023-09-28 | 珠海冠宇电池股份有限公司 | Battery |
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| WO2023179338A1 (en) * | 2022-03-21 | 2023-09-28 | 珠海冠宇电池股份有限公司 | Battery |
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