CN108110318B - Non-aqueous electrolyte for lithium ion battery and lithium ion battery - Google Patents
Non-aqueous electrolyte for lithium ion battery and lithium ion battery Download PDFInfo
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Abstract
The application discloses a non-aqueous electrolyte for a lithium ion battery and the lithium ion battery. The non-aqueous electrolyte comprises an unsaturated phosphate ester compound and a cyclic unsaturated carboxylic anhydride compound, wherein the unsaturated phosphate ester compound has a structure shown in a formula I:
wherein, R1, R2 and R3 are respectively and independently selected from alkyl with 1-5 carbon atoms, and at least one of R1, R2 and R3 is unsaturated alkyl containing double bonds or triple bonds; the unsaturated cyclic carboxylic anhydride compound has a structure represented by formula II:
wherein R4 is selected from an alkenylene group having 2 to 4 carbon atoms or a fluorine-substituted alkenylene group having 2 to 4 carbon atoms. The non-aqueous electrolyte has excellent high-temperature cycle performance and storage performance, low impedance and excellent low-temperature performance through the synergistic effect of the first compound and the second compound.
Description
Technical Field
The application relates to the field of lithium ion battery electrolyte, in particular to a non-aqueous electrolyte for a lithium ion battery and the lithium ion battery.
Background
The lithium ion battery has the characteristics of high specific energy, large specific power, long cycle life and the like, and is mainly applied to the field of 3C digital consumer electronics, the field of new energy power automobiles and the field of energy storage at present. With the increasing demand of the mileage of new energy vehicles and the miniaturization of digital consumer electronics, the high energy density becomes the main development trend of lithium ion batteries. Improving the working voltage of the lithium ion battery is an effective way to improve the energy density of the battery.
Increasing the operating voltage of a lithium ion battery often results in performance degradation. Under high voltage, on one hand, the crystal structure of the battery anode has certain instability, and during the charging and discharging processes, the collapse of the structure can occur to cause the deterioration of the performance; on the other hand, under high voltage, the surface of the positive electrode is in a high oxidation state, the activity is high, the electrolyte is easily catalyzed to be oxidized and decomposed, decomposition products of the electrolyte are easily deposited on the surface of the positive electrode, and an extraction channel of lithium ions is blocked, so that the performance of the battery is deteriorated.
The electrolyte is a key factor influencing the comprehensive performance of the battery, and particularly, additives in the electrolyte are particularly important for playing various performances of the battery. Therefore, the matching of the electrolyte is the key to fully exert the performance of the ternary nickel-cobalt-manganese power battery. The lithium ion battery electrolyte which is currently put into practical use is a non-aqueous electrolyte added with a traditional film-forming additive such as vinylene carbonate (abbreviated as VC) or fluoroethylene carbonate (abbreviated as FEC), and the excellent cycle performance of the battery is ensured by the addition of the VC and the FEC. However, VC has poor high-voltage stability, and FEC is easily decomposed to generate gas at high temperature. Therefore, under high voltage and high temperature conditions, it is difficult for these additives to meet the cycling performance requirements of lithium ion batteries at high voltage and high temperature.
Patent application 201410534841.0 discloses a novel film-forming additive containing a triple bond of a phosphoric acid ester compound, which can improve not only high-temperature cycle properties but also storage properties significantly. However, in research, technologists in the field find that the triple-bond phosphate additive can form a film not only on a positive electrode, but also on a negative electrode, and the film forming on the negative electrode can obviously increase the impedance of the negative electrode and obviously deteriorate the low-temperature performance.
The cyclic unsaturated carboxylic anhydride compound is also found in some related documents and patents as an additive of lithium battery electrolyte, and the cyclic unsaturated carboxylic anhydride compound and triple-bond phosphate ester have similar functional characteristics and can also obviously improve high-temperature performance, but also increase battery impedance, deteriorate low-temperature performance and inhibit the application of a non-aqueous lithium ion battery under low-temperature conditions.
Disclosure of Invention
The purpose of the application is to provide a nonaqueous electrolyte for a lithium ion battery and a nonaqueous electrolyte using the lithium ion battery.
In order to achieve the purpose, the following technical scheme is adopted in the application:
one aspect of the application discloses a non-aqueous electrolyte for a lithium ion battery, which comprises an unsaturated phosphate compound and an unsaturated cyclic carboxylic anhydride compound, wherein the unsaturated phosphate compound has a structure shown in formula I,
the method comprises the following steps:
wherein R is1、R2、R3Each independently selected from a hydrocarbon group having 1 to 5 carbon atoms, and R1、R2、R3At least one of them is unsaturated alkyl containing double bond or triple bond;
the unsaturated cyclic carboxylic anhydride compound has a structure shown in a formula II,
the second formula:
wherein R is4Is selected from alkenylene with 2-4 carbon atoms or alkenylene with 2-4 carbon atoms substituted by fluorine.
In general, the two types of additives with good high-temperature performance, large impedance and poor low-temperature performance are combined together to enable the battery to further obtain better high-temperature performance, but the impedance is further increased, and the low-temperature performance is further deteriorated. However, in the research of the scientists in the field, the triple bond phosphate ester compound and the cyclic unsaturated carboxylic anhydride compound are added into the non-aqueous electrolyte of the lithium ion battery, compared with the single triple bond phosphate ester compound, the high temperature performance is obviously improved, and the interface impedance is unexpectedly reduced and the low temperature performance is obviously improved.
The technical principle of simultaneously adding the unsaturated phosphate compound and the cyclic unsaturated carboxylic anhydride compound is as follows: in the first charging process, the unsaturated phosphate compounds can form a film on the negative electrode, and the passive film formed by the compounds on the negative electrode has poor conductivity and can obviously increase the impedance of the negative electrode, so that the overall impedance of the battery is obviously larger and the low-temperature performance is poor. The unsaturated cyclic carboxylic anhydride compound also has a strong negative film forming function in the first charging process, which is mainly reflected in that the negative film forming potential of the compound is high, and the unsaturated phosphate compound can form a film on the negative electrode preferentially, so that the subsequent film forming of the unsaturated phosphate compound on the negative electrode is inhibited, and the impedance of the battery is reduced. According to the application, the unsaturated phosphate compound and the unsaturated cyclic carboxylic anhydride compound are used together, and the unsaturated phosphate compound and the unsaturated cyclic carboxylic anhydride compound are coordinated to generate a special effect which is not achieved when the unsaturated phosphate compound and the unsaturated cyclic carboxylic anhydride compound are used independently.
From the above description, the technical principle of adding the unsaturated phosphate compound and the cyclic unsaturated carboxylic anhydride compound simultaneously can be illustrated by using fig. 1 and 2, where Blank electrolyte is shown in the figure: EC/EMC/DEC 1/1/1 (volume ratio), LiPF 6: 1M. As can be seen from fig. 1 and 2, the unsaturated phosphate (compound 1) starts to form a film at about 2.7V during the first charging process at the negative electrode, and the film formed at the negative electrode causes the impedance of the negative electrode to increase significantly; the cyclic unsaturated carboxylic anhydride Compound (CA) is added on the basis of the unsaturated phosphate ester (compound 1), the cyclic unsaturated carboxylic anhydride Compound (CA) can form a film on the surface of the negative electrode preferentially at about 1.5V and 2V, and the film formed by the cyclic unsaturated carboxylic anhydride Compound (CA) preferentially inhibits the film formation of the unsaturated phosphate ester (compound 1) at the subsequent 2.7V, so that the impedance of the negative electrode is reduced.
Specifically, the unsaturated phosphate ester compound represented by the formula one can be selected from compounds of the following structural formula:
it is understood that the unsaturated phosphate compounds represented by formula I and the unsaturated phosphate compounds of compounds 1 to 6 are preferred technical solutions of the present application, and other unsaturated phosphate compounds with similar physicochemical properties are not excluded.
Specifically, the cyclic unsaturated carboxylic acid anhydride represented by the above formula two may be selected from one or more of maleic anhydride (abbreviated as MA) and 2-methylmaleic anhydride (abbreviated as CA).
It is understood that both the cyclic unsaturated carboxylic acid anhydride compound represented by formula II and MA or CA are preferred embodiments of the present invention, and other cyclic unsaturated carboxylic acid anhydride compounds having similar physicochemical properties are not excluded.
Preferably, in the lithium ion battery nonaqueous electrolyte solution of the present application, the unsaturated phosphate ester compound accounts for 0.1% to 3% of the total weight of the lithium ion battery nonaqueous electrolyte solution, and more preferably 0.1% to 2%.
As can be seen from the above description, when the amount of the unsaturated phosphate compound is less than 0.1%, the film forming effect of the positive electrode is deteriorated, the protective effect on the positive electrode is reduced, and the performance improving effect is reduced; when the amount is more than 2%, the film formation at the electrode interface becomes thicker, and the impedance at the electrode interface, particularly the impedance at the negative electrode interface, is increased, thereby increasing the overall impedance of the battery and deteriorating the battery performance.
Preferably, in the lithium ion battery nonaqueous electrolyte solution of the present application, the cyclic unsaturated carboxylic acid anhydride compound accounts for 0.1% to 3% of the total weight of the lithium ion battery nonaqueous electrolyte solution, and more preferably 0.1% to 2%.
Meanwhile, as can be seen from the above description, when the content of the unsaturated cyclic carboxylic anhydride compound is less than 0.1%, the film forming effect thereof on the negative electrode becomes poor, and it is difficult to effectively prevent the film formation of the unsaturated phosphate compound on the negative electrode; when the content of the unsaturated cyclic carboxylic anhydride compound is more than 2%, the film formation at the electrode interface becomes thick, and the impedance at the electrode interface, particularly the impedance at the negative electrode interface, increases, and the overall impedance of the battery increases, thereby deteriorating the battery performance.
Furthermore, the lithium ion battery nonaqueous electrolyte also comprises at least one of unsaturated cyclic carbonate or cyclic sultone or cyclic sulfate.
Further, the amount of the unsaturated cyclic carbonate compound is 0.1 to 5 percent of the total weight of the nonaqueous electrolytic solution. The dosage of the cyclic sultone compound accounts for 0.1 to 5 percent of the total weight of the nonaqueous electrolyte. The dosage of the cyclic sulfate compound accounts for 0.1 to 5 percent of the total weight of the nonaqueous electrolyte.
Further, the unsaturated cyclic carbonate is selected from at least one of vinylene carbonate and ethylene carbonate.
The cyclic sultone is selected from at least one of 1, 3-propane sultone, 1, 4-butane sultone, 1, 3-propene sultone and methylene methane disulfonate.
The cyclic sulfate is selected from one or two of vinyl sulfate and allyl sulfate.
The nonaqueous electrolytic solution contains a nonaqueous organic solvent, and the organic solvent is at least one selected from the group consisting of ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, and propyl methyl carbonate.
Further, in the nonaqueous electrolytic solution of the present application, the lithium salt is at least one selected from the group consisting of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium bis (trifluoromethylsulfonyl) imide and lithium bis (fluorosulfonyl) imide.
The application also discloses a lithium ion battery, which comprises a positive electrode, a negative electrode, a diaphragm arranged between the positive electrode and the negative electrode, and electrolyte, wherein the electrolyte is the lithium ion battery non-aqueous electrolyte.
The charge cutoff voltage of the lithium ion battery of the present application is greater than or equal to 4.3V.
Further, in the lithium ion battery of the present application, the positive electrode is selected from LiCoO2、LiNiO2、LiMn2O4、 LiCo1- yMyO2、LiNi1-yMyO2、LiMn2-yMyO4And LiNixCoyMnzM1-x-y-zO2At least one of; wherein M is selected from at least one of Fe, Co, Ni, Mn, Mg, Cu, Zn, Al, Sn, B, Ga, Cr, Sr, V and Ti, y is more than or equal to 0 and less than or equal to 1, x 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, and x + y + z is less than or equal to 1.
The nonaqueous electrolytic solution of the present invention can be applied to various lithium ion batteries including, but not limited to, the types listed in the present application.
Drawings
FIG. 1 is a first charge capacity differential diagram of a blank electrolyte, example 6 and comparative example 1;
FIG. 2 is a graph of the AC impedance of a blank electrolyte, example 6 and comparative example 1.
Detailed Description
The present application is described in further detail below with reference to specific embodiments and the attached drawings. The following examples are intended to be illustrative of the present application only and should not be construed as limiting the present application.
Examples
In this example, an electrolyte was prepared according to the composition and formulation shown in table 1, wherein a plurality of non-aqueous electrolytes for lithium ion batteries of the present application were designed, and a plurality of comparative examples, detailed in table 1.
Lithium hexafluorophosphate was used as the lithium salt in this example. It is understood that the lithium salt used in this example is only one specific embodiment, and other lithium salts commonly used in the art, such as LiBF4、LiBOB、LiDFOB、LiPO2F2、 LiSbF6、LiAsF6、LiN(SO2CF3)2、LiN(SO2C2F5)2、LiC(SO2CF3)3And LiN (SO)2F)2The same applies to this example, and is not limited in particular.
The preparation method of the electrolyte comprises the following steps: the nonaqueous organic solvent was prepared in a volume ratio of EC/EMC/DEC 1/1/1 (volume ratio), and then lithium hexafluorophosphate was added thereto in a final concentration of 1.0mol/L, and the additives were added as shown in table 1. The percentages in table 1 are weight percentages, i.e. the percentage of additive to the total electrolyte weight.
TABLE 1 electrolyte Components and amounts
In the lithium ion battery of this example, LiNi was used as the positive electrode active material0.5Co0.2Mn0.3O2The negative electrode adopts artificial graphite, and the diaphragm adopts a polypropylene, polyethylene and polypropylene three-layer isolating membrane. And 4.35V lithium ion batteries are manufactured. The method comprises the following specific steps:
the preparation method of the anode comprises the following steps: according to the weight ratio of 96.8: 2.0: 1.2 Mass ratio Mixed Positive electrode active Material LiNi0.5Co0.2Mn0.3O2The conductive carbon black and the adhesive polyvinylidene fluoride are dispersed in N-methyl-2-pyrrolidone to obtain anode slurry, the anode slurry is uniformly coated on two sides of an aluminum foil, and the anode plate is obtained after drying, rolling and vacuum drying are carried out, and an aluminum outgoing line is welded by an ultrasonic welding machine, wherein the thickness of the anode plate is between 120 and 150 mu m.
The preparation method of the negative electrode comprises the following steps: according to the weight ratio of 96: 1: 1.2: mixing graphite, conductive carbon black, binder styrene butadiene rubber and carboxymethyl cellulose according to the mass ratio of 1.8, dispersing in deionized water to obtain negative electrode slurry, coating the negative electrode slurry on two sides of a copper foil, drying, rolling and vacuum drying, and welding a nickel outgoing line by using an ultrasonic welding machine to obtain a negative electrode plate, wherein the thickness of the negative electrode plate is between 120 and 150 mu m.
The preparation method of the diaphragm comprises the following steps: the three-layer isolating film of polypropylene, polyethylene and polypropylene is adopted, and the thickness is 20 mu m.
The battery assembling method comprises the following steps: placing three layers of isolating films with the thickness of 20 mu m between the positive plate and the negative plate, then winding a sandwich structure consisting of the positive plate, the negative plate and the diaphragm, flattening the wound body, then placing the flattened wound body into an aluminum foil packaging bag, and baking the flattened wound body in vacuum at 75 ℃ for 48 hours to obtain a battery cell to be injected with liquid; and injecting the prepared electrolyte into a battery cell, carrying out vacuum packaging, and standing for 24 h.
Formation of a battery: charging at 0.05C for 180min, charging at 0.1C to 3.95V, vacuum sealing twice, standing at 45 deg.C for 48h, further charging at 0.2C to 4.4V, and discharging at 0.2C to 3.0V.
In this example, the capacity retention rates of the respective electrolyte batteries after 300 cycles at 45 ℃ and 500 cycles at 1C at normal temperature, the capacity retention rates after 30 days of storage at 60 ℃, the capacity recovery rates and the thickness expansion rates were respectively tested, and the discharge efficiency at-20 ℃ and 1C and the normal and low temperature direct current impedance were respectively tested. The specific test method is as follows:
(1) the capacity retention rate of 300 cycles of 1C at 45 ℃ is actually measured high-temperature cycle performance of the battery, and the specific test method comprises the following steps: at 45 ℃, the formed battery is charged to 4.35V by using a 1C constant current and constant voltage, the current is cut off to be 0.01C, and then the battery is discharged to 3.0V by using a 1C constant current. After 300 cycles of such charge/discharge, the capacity retention rate after 300 cycles was calculated to evaluate the high temperature cycle performance. The capacity retention rate calculation formula of 300 times of 45 ℃ 1C circulation is as follows:
the 300 th cycle capacity retention (%) (300 th cycle discharge capacity/first cycle discharge capacity) × 100%.
(2) And (3) testing the normal-temperature cycle performance: at 25 ℃, the formed battery is charged to 4.35V by using a 1C constant current and constant voltage, and then discharged to 3.0V by using a 1C constant current. The capacity retention rate of the 500 th cycle after 500 cycles of charge/discharge was calculated to evaluate the normal temperature cycle performance. The calculation formula is as follows:
the 500 th cycle capacity retention ratio (%) (500 th cycle discharge capacity/first cycle discharge capacity) × 100%.
(3) The method for testing the capacity retention rate, the capacity recovery rate and the thickness expansion rate after 30 days of storage at 60 ℃ comprises the following steps: the formed battery is charged to 4.35V at constant current and constant voltage of 1C at normal temperature, the cut-off current is 0.01C, then the 1C constant current is used for discharging to 3.0V, the initial discharge capacity of the battery is measured, then the 1C constant current and constant voltage are used for charging to 4.35V, the cut-off current is 0.01C, the initial thickness of the battery is measured, then the battery is stored for 30 days at 60 ℃, the thickness of the battery is measured, then the 1C constant current is used for discharging to 3.0V, the retention capacity of the battery is measured, then the 1C constant current and constant voltage are used for charging to 4.35V, the cut-off current is 0.01C, then the 1C constant current is used for discharging to 3.0V, and the recovery. The calculation formulas of the capacity retention rate, the capacity recovery rate and the thickness expansion rate are as follows:
battery capacity retention (%) retention capacity/initial capacity × 100%
Battery capacity recovery (%) -recovery capacity/initial capacity X100%
The battery thickness swelling ratio (%) (thickness after 30 days-initial thickness)/initial thickness × 100%.
(4) And (3) testing low-temperature discharge performance: at 25 ℃, the formed battery is charged to 4.35V by using a 1C constant current and constant voltage, and then discharged to 3.0V by using a 1C constant current, and the discharge capacity is recorded. And then filling the mixture with a 1C constant current and a constant voltage, standing the mixture in an environment at the temperature of minus 20 ℃ for 12 hours, discharging the mixture to 3.0V with the 1C constant current, and recording the discharge capacity.
The low-temperature discharge efficiency at-20 ℃ was 1C discharge capacity (-20 ℃)/1C discharge capacity (25 ℃).
(5) Testing the performance of normal temperature Direct Current Impedance (DCIR): the battery 1C after formation was charged at 25 ℃ to an SOC of 50%, charged and discharged for ten seconds with 0.1C, 0.2C, 0.5C, 1C, and 2C, respectively, and the charge and discharge cutoff voltages were recorded, respectively. Then, a linear graph (unit: mV) is plotted with the charge and discharge currents of different magnifications as abscissa (unit: A) and the cut-off voltages corresponding to the charge and discharge currents as ordinate.
Discharge DCIR value is the slope value of a linear plot of different discharge currents with corresponding cutoff voltages.
The results of the tests are shown in Table 2.
TABLE 2 test results
Through the tests, a blank electrolyte, a first charge capacity differential diagram (shown in fig. 1) and an alternating current impedance diagram (shown in fig. 2) of example 6 and comparative example 1 were formed.
As can be seen from fig. 1 and 2, the unsaturated phosphate (compound 1) starts to form a film at about 2.7V during the first charging process at the negative electrode, and the film formed at the negative electrode causes the impedance of the negative electrode to increase significantly; the cyclic unsaturated carboxylic anhydride Compound (CA) is added on the basis of the unsaturated phosphate ester (compound 1), the cyclic unsaturated carboxylic anhydride Compound (CA) forms a film on the surface of the negative electrode preferentially at about 1.5V and 2V, and the film formed by the cyclic unsaturated carboxylic anhydride Compound (CA) preferentially inhibits the film formation of the unsaturated phosphate ester (compound 1) at the subsequent 2.7V, so that the impedance of the negative electrode is further reduced.
Through comparison of test results of comparative examples 1-2, it can be found that when the unsaturated phosphate compound is used alone, the cycle performance and the high-temperature storage are good, but the impedance is large, and the low-temperature performance is poor. When the unsaturated cyclic carboxylic anhydride compound is used alone, the impedance is low, the low-temperature performance is good, but the cycle performance and the high-temperature storage are poor.
In the test results of examples 1 to 18 of the present application, it can be found that, by comparing comparative example 1 with examples 2,6 and 8, the addition of the unsaturated cyclic carboxylic anhydride compound based on the unsaturated phosphoric ester compound not only improves the cycle performance and the high temperature performance, but also improves the low temperature performance and reduces the impedance.
Meanwhile, in the test results of examples 1 to 18 of the present application, it was found that the high temperature performance and the low temperature performance of all examples including both the unsaturated phosphate ester compound and the unsaturated cyclic carboxylic anhydride compound were improved as compared with comparative example 1. By comparing examples 2, 5,6 and 7, the high temperature performance is improved with the increase of the unsaturated phosphate ester compound, but the low temperature performance is relatively reduced, and particularly, the impedance is increased with the increase of the dosage. Especially, when the content of the unsaturated phosphate compound is very high and the content of the unsaturated cyclic carboxylic anhydride compound is very low, the impedance is large and the low-temperature performance is obviously insufficient.
In summary, the unsaturated phosphate compound and the unsaturated cyclic carboxylic anhydride compound are used in combination, and the battery can obtain excellent high-temperature performance, excellent cycle performance and good low-temperature performance under the appropriate proportion.
The foregoing is a more detailed description of the present application in connection with specific embodiments thereof, and it is not intended that the present application be limited to the specific embodiments thereof. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (9)
1. A non-aqueous electrolyte for a lithium ion battery is characterized by comprising an unsaturated phosphate compound and a cyclic unsaturated carboxylic acid anhydride compound, wherein the unsaturated phosphate compound is used for improving the high-temperature performance and the low-temperature performance of the electrolyte and reducing the interfacial resistance, and has a structure shown in formula I,
the method comprises the following steps:
wherein R is1、R2、R3Each independently selected from a hydrocarbon group having 1 to 5 carbon atoms, and R1、R2、R3At least one of them is unsaturated alkyl containing double bond or triple bond;
the unsaturated cyclic carboxylic anhydride compound has a structure shown in a formula II,
the second formula:
wherein R is4Is selected from alkenylene with 2-4 carbon atoms or alkenylene with 2-4 carbon atoms substituted by fluorine;
the unsaturated phosphate ester compound is selected from
One or more of (a).
2. The nonaqueous electrolytic solution of claim 1, wherein the cyclic unsaturated carboxylic acid anhydride is one or more selected from maleic anhydride and 2-methyl maleic anhydride.
3. The nonaqueous electrolyte solution of claim 1, wherein the unsaturated phosphate ester compound accounts for 0.1-3% of the total weight of the nonaqueous electrolyte solution of the lithium ion battery, and the cyclic unsaturated carboxylic anhydride compound accounts for 0.1-3% of the total weight of the nonaqueous electrolyte solution of the lithium ion battery.
4. The nonaqueous electrolytic solution of any one of claims 1 to 3, wherein the nonaqueous electrolytic solution further comprises at least one of an unsaturated cyclic carbonate, a cyclic sultone, and a cyclic sulfate.
5. The nonaqueous electrolytic solution of claim 4, wherein the unsaturated cyclic carbonate is at least one selected from vinylene carbonate and ethylene carbonate;
the cyclic sultone is selected from at least one of 1, 3-propane sultone, 1, 4-butane sultone, 1, 3-propene sultone and methylene methane disulfonate;
the cyclic sulfate is selected from one or two of vinyl sulfate and allyl sulfate;
the dosage of the unsaturated cyclic carbonate compound accounts for 0.1-5% of the total weight of the nonaqueous electrolyte, the dosage of the cyclic sultone compound accounts for 0.1-5% of the total weight of the nonaqueous electrolyte, and the dosage of the cyclic sulfate compound accounts for 0.1-5% of the total weight of the nonaqueous electrolyte.
6. The nonaqueous electrolytic solution of claim 1, wherein the nonaqueous electrolytic solution contains a nonaqueous organic solvent and a lithium salt, and the nonaqueous organic solvent is at least one selected from the group consisting of ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, ethylmethyl carbonate, and propylmethyl carbonate; the lithium salt is selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium bis (trifluoromethylsulfonyl) imide and lithium bis (fluorosulfonyl) imide.
7. A lithium ion battery comprising a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and an electrolytic solution, wherein the electrolytic solution is the nonaqueous electrolytic solution according to any one of claims 1 to 6.
8. The lithium ion battery of claim 7, wherein the positive electrode comprises a positive active material selected from the group consisting of LiCoO2、LiNiO2、LiMn2O4、LiCo1-yMyO2、LiNi1-yMyO2、LiMn2-yMyO4And LiNixCoyMnzM1-x-y-zO2At least one of; wherein M is selected from at least one of Fe, Co, Ni, Mn, Mg, Cu, Zn, Al, Sn, B, Ga, Cr, Sr, V and Ti, y is more than or equal to 0 and less than or equal to 1, x 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, and x + y + z is less than or equal to 1.
9. The lithium ion battery of claim 7 or 8, wherein the charge cut-off voltage of the lithium ion battery is greater than or equal to 4.3V.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611063485.4A CN108110318B (en) | 2016-11-25 | 2016-11-25 | Non-aqueous electrolyte for lithium ion battery and lithium ion battery |
| JP2018564811A JP6814821B2 (en) | 2016-11-25 | 2016-12-30 | Non-aqueous electrolyte for lithium-ion batteries |
| EP16922345.0A EP3547433A4 (en) | 2016-11-25 | 2016-12-30 | Non-aqueous electrolyte for lithium-ion battery and lithium-ion battery |
| PCT/CN2016/113649 WO2018094843A1 (en) | 2016-11-25 | 2016-12-30 | Non-aqueous electrolyte for lithium-ion battery and lithium-ion battery |
| US16/316,621 US11362370B2 (en) | 2016-11-25 | 2016-12-30 | Non-aqueous electrolyte for lithium-ion battery and lithium-ion battery |
| JP2020136214A JP6963068B2 (en) | 2016-11-25 | 2020-08-12 | Non-aqueous electrolyte for lithium-ion batteries |
| JP2021169184A JP7208330B2 (en) | 2016-11-25 | 2021-10-14 | Non-aqueous electrolyte for lithium-ion batteries |
| US17/735,109 US11757132B2 (en) | 2016-11-25 | 2022-05-02 | Non-aqueous electrolyte for lithium-ion battery and lithium-ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201611063485.4A CN108110318B (en) | 2016-11-25 | 2016-11-25 | Non-aqueous electrolyte for lithium ion battery and lithium ion battery |
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| CN109346771A (en) * | 2018-09-21 | 2019-02-15 | 杉杉新材料（衢州）有限公司 | A kind of lithium ion battery high-voltage electrolyte and lithium ion battery |
| CN111864262A (en) * | 2019-04-29 | 2020-10-30 | 诺莱特电池材料(苏州)有限公司 | Lithium ion battery non-aqueous electrolyte and lithium ion battery |
| CN110323487B (en) * | 2019-07-10 | 2021-09-21 | 宁德时代新能源科技股份有限公司 | Lithium ion battery and electric equipment comprising same |
| CN111354978A (en) * | 2020-03-09 | 2020-06-30 | 东莞维科电池有限公司 | High-voltage ternary lithium ion battery electrolyte and high-voltage ternary lithium ion battery |
| CN111916825B (en) * | 2020-06-30 | 2022-03-18 | 珠海冠宇电池股份有限公司 | Non-aqueous electrolyte for lithium ion battery and lithium ion battery using same |
| CN111934017A (en) * | 2020-08-28 | 2020-11-13 | 珠海市赛纬电子材料股份有限公司 | Non-aqueous electrolyte for lithium ion battery and lithium ion battery containing same |
| CN114024028A (en) * | 2021-09-23 | 2022-02-08 | 深圳新宙邦科技股份有限公司 | Secondary battery |
| CN114267882A (en) * | 2021-12-17 | 2022-04-01 | 珠海冠宇电池股份有限公司 | Battery with a battery cell |
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| CN103346350A (en) * | 2013-06-27 | 2013-10-09 | 深圳市崧鼎科技有限公司 | Electrolyte for improving performance of lithium ion battery and battery |
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