CN113594548A - Electrolyte and lithium ion battery - Google Patents
Electrolyte and lithium ion battery Download PDFInfo
- Publication number
- CN113594548A CN113594548A CN202110966290.5A CN202110966290A CN113594548A CN 113594548 A CN113594548 A CN 113594548A CN 202110966290 A CN202110966290 A CN 202110966290A CN 113594548 A CN113594548 A CN 113594548A
- Authority
- CN
- China
- Prior art keywords
- electrolyte
- ion battery
- lithium ion
- mass
- lithium
- 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.)
- Pending
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
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides an electrolyte and a lithium ion battery. The first aspect of the present invention provides an electrolyte comprising a polycyano compound, ethyl propionate, and a boron-containing lithium salt; the multicyano compound is a compound containing 3-4 cyano groups, and the mass of the multicyano compound is 0.3% -3.5% of the total mass of the electrolyte; the mass of the ethyl propionate is 4-30% of the total mass of the electrolyte; the mass of the boron-containing lithium salt is 0.03-0.8% of the total mass of the electrolyte. The electrolyte provided by the invention can give consideration to the high and low temperature performances of the lithium ion battery under high voltage.
Description
Technical Field
The invention relates to an electrolyte and a lithium ion battery, and relates to the technical field of secondary batteries.
Background
People's reliance on portable electronic devicesWith the increasing of the degree of dependence, research and development personnel continuously develop lithium ion batteries with higher energy density to meet the terminal requirements, and the improvement of the working voltage of the lithium ion batteries is one of the means for improving the energy density. In order to adapt to high voltage environment, it is common to add positive electrode protective additive and negative electrode film forming additive to the electrolyte to mitigate decomposition of the electrolyte, for example, conventional high voltage lithium ion battery uses layered oxide lithium cobaltate LiCoO2As the positive electrode active material, the electrolyte is easy to react with the positive electrode active material under the condition of high voltage, so that the electrolyte is decomposed; carbon and silicon materials are used as the negative electrode active material, and generally, a solid electrolyte interface film (SEI) is formed on the surface of the negative electrode by the electrolyte solution through an additive, thereby suppressing the decomposition reaction of solvent molecules in the electrolyte solution. Therefore, the addition of additives to the electrolyte solution is helpful to reduce the decomposition reaction of the electrolyte solution and improve the high-temperature performance of the lithium ion battery, but such additives usually cause the increase of the internal resistance and the deterioration of the low-temperature performance of the lithium ion battery, so how to achieve the high-temperature performance and the low-temperature performance of the lithium ion battery is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention provides an electrolyte which is used for considering both high-temperature performance and low-temperature performance of a lithium ion battery under high voltage.
The invention also provides a lithium ion battery which comprises the electrolyte and has better high-temperature and low-temperature performances under high voltage.
The first aspect of the present invention provides an electrolyte comprising a polycyano compound, ethyl propionate, and a boron-containing lithium salt;
the multicyano compound is a compound containing 3-4 cyano groups, and the mass of the multicyano compound is 0.3% -3.5% of the total mass of the electrolyte;
the mass of the ethyl propionate is 4-30% of the total mass of the electrolyte;
the mass of the boron-containing lithium salt is 0.03-0.8% of the total mass of the electrolyte.
The invention provides an electrolyte, which comprises a polycyano compound, ethyl propionate and a lithium salt containing boron, wherein the polycyano compound is a compound with a molecular structure comprising 3-4 cyano groups, and the polycyano compound can better protect an anode active substance and improve the high-temperature cycle performance of a lithium ion battery; the Ethyl Propionate (EP) can improve the low-temperature conductivity of the electrolyte, and is beneficial to improving the low-temperature cycle performance of the lithium ion battery; the boron-containing lithium salt may participate in the formation of the SEI film; meanwhile, the addition amounts of the polycyano compound, the ethyl propionate and the boron-containing lithium salt also affect the high-temperature and low-temperature performance of the lithium ion battery, for example, although the ethyl propionate is helpful for improving the low-temperature performance of the lithium ion battery, but the high content of the ethyl propionate easily causes the high-temperature performance deterioration of the lithium ion battery, so that the mass of the ethyl propionate is 4-30% of the total mass of the electrolyte, the total mass of the electrolyte is 100%, the mass of ethyl propionate/the total mass of the electrolyte is 4% -30%, similarly, the mass of the polycyano compound is 0.3% -3.5% of the total mass of the electrolyte, the mass of the boron-containing lithium salt is 0.03% -0.8% of the total mass of the electrolyte, and a person skilled in the art can select a proper polycyano compound and a proper boron-containing lithium salt, and mix the proper polycyano compound and the boron-containing lithium salt with other components of the electrolyte according to the mass fractions to prepare the electrolyte. The electrolyte provided by the invention can give consideration to the high and low temperature performances of the lithium ion battery under high voltage, and the high voltage specifically means that the working voltage of the lithium ion battery containing the electrolyte is more than 4.4V.
In one embodiment, the polycyano compound may be a compound including 3 to 4 cyano groups in a molecular structure, which is generally known in the art, and specifically, the polycyano compound may be one or more selected from 1,2, 3-propanetricitrile, 1,3, 6-hexanetricarbonitrile, 1,2, 3-tris (2-cyanoethoxy) propane, 1,3, 5-cyclohexanetricarbonitrile, 1,3, 3-propanetetracyanonitrile, 1,2,2, 3-tetracyanopropane.
When the polycyano compound is selected from two or more of the above-described various specific compounds, the present invention does not limit the ratio between the respective specific compounds.
The boron-containing lithium salt may be a lithium salt including a boron atom in a molecular structure as is common in the art, and specifically, the boron-containing lithium salt is selected from one or more of lithium tetrafluoroborate, lithium difluorooxalate borate and lithium dioxalate borate.
When the boron-containing lithium salt is selected from two or more of the above-mentioned various specific compounds, the present invention does not limit the ratio between the respective specific compounds.
The electrolyte is prepared by mixing conventional compounds, and the nonaqueous organic solvent is prepared by using a nonaqueous organic solvent as a solvent for dissolving the lithium salt and the additive, for example, the nonaqueous organic solvent comprises ethylene carbonate, propylene carbonate, fluoroethylene carbonate and diethyl carbonate, wherein the ethylene carbonate, the propylene carbonate and the diethyl carbonate are used as the common nonaqueous organic solvent in the field, and the additional addition of fluoroethylene carbonate helps to improve the film forming effect of the electrolyte on the surfaces of the positive electrode and the negative electrode, and further improves the high-temperature and low-temperature performance of the lithium ion battery.
The preparation of the electrolyte can be carried out according to the usual techniques in the art, for example in a glove box filled with inert gas (H)2O＜10ppm，O2Less than 5ppm), uniformly mixing ethylene carbonate, propylene carbonate, fluoroethylene carbonate and diethyl carbonate to prepare a non-aqueous organic solvent, and then adding lithium salt and an additive into the non-aqueous organic solvent to obtain the electrolyte.
In a second aspect, the invention provides a lithium ion battery comprising any of the above-described electrolytes.
On the basis of the electrolyte provided by the first aspect of the invention, a lithium ion battery is prepared by matching a positive plate, a diaphragm and a negative plate according to a conventional preparation process, and specifically, the lithium ion battery further comprises the positive plate, the positive plate comprises a positive current collector and a positive active layer arranged on the surface of the positive current collector, the positive active layer comprises lithium cobaltate, and the mass of the lithium cobaltate is 97-99.2% of the total mass of the positive active layer.
When the positive active layer comprises 97-99.2% of lithium cobaltate, a certain amount of carbon nano tubes can be added into the existing conductive system carbon black due to the good conductivity of the carbon nano tubes, so that the conductivity of the positive plate is further improved, namely the positive active layer comprises the carbon black and the carbon nano tubes.
Further, the mass of the carbon nano tube is 0.01-0.5% of the total mass of the positive electrode active layer.
Further, the carbon nanotubes are single-walled carbon nanotubes.
In addition, the positive active layer also comprises a binder, and in the preparation process of the positive plate, a positive active substance lithium cobaltate, a conductive agent (carbon black and carbon nano tubes) and the binder are mixed and dispersed in a solvent according to a certain mass ratio to prepare positive active slurry, the positive active slurry is uniformly coated on the surface of a positive current collector, and the positive plate is prepared after drying, rolling and slitting.
The material of the positive current collector can be aluminum foil; the binder can be one or more selected from polyvinylidene fluoride, polytetrafluoroethylene, polyvinylidene fluoride, polyvinyl fluoride, polyethylene, polypropylene, polyvinyl alcohol, polyvinyl chloride, polyvinylpyrrolidone and polyurethane.
The lithium ion battery also comprises a negative plate, wherein the negative plate comprises a negative current collector and a negative active layer arranged on the surface of the negative current collector, the negative active layer comprises a negative active substance, a conductive agent, a binder and a dispersing agent, and the negative active substance can be selected from one or more than two of the existing materials, such as graphite, hard carbon, soft carbon, silicon and the like; the conductive agent can be one or more than two of carbon black, acetylene black, graphene, Ketjen black and carbon fiber; the type of the binder is the same as that of the positive plate; the dispersant may be sodium carboxymethylcellulose.
In the preparation process of the negative plate, dispersing a negative active material, a conductive agent, a binder and a dispersant in a solvent according to a certain mass ratio, and fully stirring and mixing to form uniform negative active slurry; and uniformly coating the negative electrode slurry on the negative electrode current collector layer, and drying, rolling and slitting to obtain the negative electrode sheet.
The negative current collector may be a copper foil or a carbon-coated copper foil.
The separator may be selected from one of existing separator materials, such as a polypropylene separator (PP), a polyethylene separator (PE), a polyvinylidene fluoride separator, and the like.
And sequentially stacking the positive electrode, the diaphragm and the negative electrode to enable the diaphragm to be positioned between the positive electrode and the negative electrode to play a role of isolation, then preparing a naked battery cell by a winding process or a lamination process, placing the naked battery cell in an outer packaging shell, drying, injecting the electrolyte provided by the invention, and carrying out vacuum packaging, standing, formation, shaping and other processes to prepare the lithium ion battery.
In conclusion, the lithium ion battery provided by the invention has better high and low temperature performances under the condition of high voltage of more than 4.4V.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The electrolyte provided in this example includes 0.3% of 1,3, 6-Hexanetricarbonitrile (HTN), 4% of Ethyl Propionate (EP), and 0.2% of lithium difluorooxalato borate (liddob), 15% of lithium hexafluorophosphate, with the balance being ethylene carbonate, propylene carbonate, fluoroethylene carbonate, and diethyl carbonate (the mass ratio of ethylene carbonate, propylene carbonate, fluoroethylene carbonate, and diethyl carbonate is 17:25:8: 50).
The preparation method of the electrolyte comprises the following steps: in a glove box filled with inert gas (H)2O＜10ppm，O2Less than 5ppm), uniformly mixing ethylene carbonate, propylene carbonate, fluoroethylene carbonate and diethyl carbonate according to the mass ratio of 17:25:8:50, dissolving lithium hexafluorophosphate in the mixture, detecting the lithium hexafluorophosphate to be qualified through water content and free acid to obtain a base electrolyte, and adding 1,3, 6-Hexanetricarbonitrile (HTN), Ethyl Propionate (EP) and lithium difluorooxalato borate (LiDFOB) into the base electrolyte to obtain the electrolyte.
Example 2
The electrolyte provided in this example can be referred to example 1, except that the electrolyte includes 1% HTN, 10% EP, and 0.5% lidfo.
Example 3
The electrolyte provided in this example can be referred to example 1, except that the electrolyte includes 2% HTN, 20% EP, and 0.6% lidfo.
Example 4
The electrolyte provided in this example was referenced to example 1 except that the electrolyte included 2% 1,2, 3-tris (2-cyanoethoxy) propane (TCEP), 20% EP and 0.6% lidfo.
Example 5
The electrolyte provided in this example can be referred to example 1, except that the electrolyte includes 3% HTN, 25% EP, and 0.5% lidfo.
Example 6
The electrolyte provided in this example can be referred to example 1 except that the electrolyte includes 3.5% HTN, 30% EP, 0.5% liddob, and 0.3% lithium tetrafluoroborate (LiBF)4)。
Example 7
The electrolyte provided in this example can be referred to example 1 except that the electrolyte includes 1% HTN, 4% EP, and 0.03% LiBF4。
Example 8
This example provides an electrolyte as described in example 1, except that the electrolyte comprises 1% HTN, 1% 1,1,3, 3-Propanetetracyanonitrile (PTN), 10% EP, and 0.2% LiBF4。
Example 9
The electrolyte provided in this example can be referred to example 1 except that the electrolyte includes 2% PTN, 20% EP and 0.5% LiBF4。
Example 10
The electrolyte provided in this example can be referred to example 1 except that the electrolyte includes 3% PTN, 25% EP, 0.3% lidfo and 0.2% LiBF4。
Example 11
The electrolyte provided by the embodiment can be referred to as embodiment 1,with the difference that the electrolyte comprises 3.5% PTN, 30% EP and 0.03% LiBF4。
Example 12
The electrolyte provided in this example is referred to in example 1, except that the electrolyte includes 1% HTN, 6% EP, and 0.2% lithium bis (oxalato) borate (LiBOB).
Example 13
The electrolyte provided in this example is referred to in example 1, except that the electrolyte comprises 1% HTN, 10% EP and 0.3% LiBOB.
Example 14
The electrolyte provided in this example is referred to in example 1, except that the electrolyte comprises 2% HTN, 20% EP and 0.5% LiBOB.
Example 15
The electrolyte provided in this example can be referred to example 1 except that the electrolyte includes 2% HTN, 1% PTN, 30% EP, 0.5% LiBOB, and 0.1% LiBF4。
Comparative example 1
The electrolyte provided by this comparative example can be referred to example 1 except that the electrolyte includes 2% Adiponitrile (AND), 20% EP, AND 0.6% lidfo.
Comparative example 2
The electrolyte provided by this comparative example can be referred to example 1 except that the electrolyte includes 2% HTN, 40% EP, and 0.5% lidob.
Comparative example 3
The electrolyte provided by this comparative example can be referred to example 1 except that the electrolyte includes 4% HTN, 10% EP, and 0.5% lidob.
Comparative example 4
The electrolyte provided by this comparative example can be referred to example 1 except that the electrolyte includes 0.1% HTN and 0.5% lidob.
Comparative example 5
The electrolyte provided by this comparative example can be referred to example 1 except that the electrolyte comprises 2% AND, 20% EP AND 0.5% LiBF4。
Comparative example 6
The electrolyte provided by this comparative example can be referenced to example 1, except that the electrolyte includes 2% HTN, 20% EP.
Table 1 tabulates the compositions and mass percentages of the electrolytes provided in examples 1-15 and comparative examples 1-6 to make the differences between the electrolytes used in examples 1-15 and comparative examples 1-6 more intuitive.
TABLE 1 description of the electrolytes used in examples 1 to 15 and comparative examples 1 to 6
The electrolytes provided in examples 1 to 15 and comparative examples 1 to 6 are matched with a positive plate, a diaphragm and a negative plate to prepare a lithium ion battery, wherein:
the positive plate comprises a positive current collector aluminum foil and a positive active layer arranged on the surface of the positive current collector aluminum foil, wherein the positive active layer comprises 97.2 parts by mass of a positive active material lithium cobaltate (LiCoO)2) The conductive carbon comprises, by mass, 1.5 parts of a binder polyvinylidene fluoride (PVDF), 1.2 parts of a conductive agent conductive carbon black and 0.1 part of a single-walled carbon nanotube.
The preparation method of the positive plate comprises the following steps: the positive electrode active material lithium cobaltate (LiCoO)2) Mixing polyvinylidene fluoride (PVDF) serving as a binder, conductive carbon black and single-walled carbon nanotubes, adding N-methylpyrrolidone (NMP), and stirring under the action of a vacuum stirrer until a mixed system becomes positive active slurry with uniform fluidity; and uniformly coating the positive active slurry on the surface of the aluminum foil of the positive current collector, and then baking, rolling and slitting to obtain the positive plate.
The negative plate comprises a negative current collector carbon-coated copper foil and a negative active layer arranged on the surface of the negative current collector carbon-coated copper foil, wherein the negative active layer comprises 97 parts by mass of negative active material graphite, 1 part by mass of thickener sodium carboxymethyl cellulose (CMC-Na), 1 part by mass of binder styrene-butadiene rubber and 1 part by mass of conductive agent acetylene black.
The preparation method of the negative plate comprises the following steps: mixing a negative active material graphite, a thickening agent sodium carboxymethyl cellulose (CMC-Na), a binder styrene butadiene rubber and a conductive agent acetylene black, adding deionized water, and stirring under the action of a vacuum stirrer to obtain negative active slurry; and uniformly coating the negative active slurry on the carbon-coated copper foil of the negative current collector, airing at room temperature, transferring to an oven at 80 ℃ for drying for 10 hours, and rolling and slitting to obtain the negative plate.
The separator was a 9 μm PP film.
Stacking the positive plate, the diaphragm and the negative plate in sequence to ensure that the diaphragm is positioned between the positive plate and the negative plate to play a role of isolation, and then winding to obtain a naked battery cell without liquid injection; and placing it in an overwrap foil; and injecting the prepared corresponding electrolyte into the dried battery cell, and performing vacuum packaging, standing, formation, shaping, sorting and other processes to obtain the lithium ion battery.
The lithium ion batteries provided in examples 1 to 15 and comparative examples 1 to 6 were subjected to high and low temperature performance tests according to the following test methods, and the test results are shown in table 2:
50 ℃ cycle test: and (3) placing the lithium ion battery in a constant temperature environment at 50 ℃ and carrying out charge-discharge test at a rate of 1C/1C (constant current and constant voltage charging, and cutoff current of 0.05C), wherein the voltage range is 3.0-4.48V, the charge-discharge cycle is carried out for 400 times, and the cycle discharge capacity is recorded and divided by the discharge capacity of the first cycle to obtain the cycle capacity retention rate at 50 ℃.
0 ℃ cycle test: and (3) placing the lithium ion battery in a constant temperature environment at 0 ℃ and carrying out a charge-discharge test at a rate of 0.3C/0.3C (constant current and constant voltage charging, and cutoff current of 0.05C), wherein the voltage range is 3.0-4.48V, the charge-discharge cycle is carried out for 100 times, and the cycle discharge capacity is recorded and divided by the first cycle discharge capacity to obtain the cycle capacity retention rate at 0 ℃.
TABLE 2 high and low temperature Performance of lithium ion batteries provided in examples 1-15 and comparative examples 1-6
As can be seen from the data provided in table 2, the lithium ion batteries provided in examples 1 to 15 have better high and low temperature performance at high voltage than those of comparative examples 1 to 6, which indicates that the addition of a proper amount of polycyano compound, ethyl propionate and boron-containing lithium salt to the electrolyte can effectively achieve both high and low temperature performance of the lithium ion battery.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An electrolyte, characterized in that the electrolyte comprises a polycyano compound, ethyl propionate and a boron-containing lithium salt;
the multicyano compound is a compound containing 3-4 cyano groups, and the mass of the multicyano compound is 0.3% -3.5% of the total mass of the electrolyte;
the mass of the ethyl propionate is 4-30% of the total mass of the electrolyte;
the mass of the boron-containing lithium salt is 0.03-0.8% of the total mass of the electrolyte.
2. The electrolyte of claim 1, wherein the polycyano compound is selected from one or more of 1,2, 3-propanetricitrile, 1,3, 6-hexanetricarbonitrile, 1,2, 3-tris (2-cyanoethoxy) propane, 1,3, 5-cyclohexanetricarbonitrile, 1,3, 3-propanetetracyanonitrile, 1,2,2, 3-tetracyanopropane.
3. The electrolyte of claim 1, wherein the boron-containing lithium salt is selected from one or more of lithium tetrafluoroborate, lithium difluorooxalate borate, and lithium dioxalate borate.
4. The electrolyte of any one of claims 1-3, wherein the electrolyte further comprises ethylene carbonate, propylene carbonate, fluoroethylene carbonate, and diethyl carbonate.
5. A lithium ion battery comprising the electrolyte of any one of claims 1 to 4.
6. The lithium ion battery according to claim 5, wherein the lithium ion battery comprises a positive plate, the positive plate comprises a positive current collector and a positive active layer arranged on the surface of the positive current collector, the positive active layer comprises lithium cobaltate, and the mass of the lithium cobaltate is 97-99.2% of the total mass of the positive active layer.
7. The lithium ion battery of claim 6, wherein the positive active layer comprises carbon black and carbon nanotubes.
8. The lithium ion battery of claim 7, wherein the carbon nanotubes are single-walled carbon nanotubes.
9. The lithium ion battery of claim 7, wherein the mass of the carbon nanotubes is 0.01-0.5% of the total mass of the positive electrode active layer.
10. The lithium ion battery according to any one of claims 5 to 9, wherein the operating voltage of the lithium ion battery is above 4.4V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110966290.5A CN113594548A (en) | 2021-08-23 | 2021-08-23 | Electrolyte and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110966290.5A CN113594548A (en) | 2021-08-23 | 2021-08-23 | Electrolyte and lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113594548A true CN113594548A (en) | 2021-11-02 |
Family
ID=78239014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110966290.5A Pending CN113594548A (en) | 2021-08-23 | 2021-08-23 | Electrolyte and lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113594548A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810554A (en) * | 2014-07-15 | 2015-07-29 | 万向A一二三系统有限公司 | Low temperature electrolyte for lithium-ion power battery and preparation method thereof |
| CN104852087A (en) * | 2015-04-15 | 2015-08-19 | 宁德时代新能源科技有限公司 | Electrolyte additive and lithium ion battery using the same |
| CN109980282A (en) * | 2019-04-09 | 2019-07-05 | 杉杉新材料（衢州）有限公司 | A kind of low temperature resistant non-aqueous electrolyte for lithium ion cell and lithium ion battery |
| CN113206296A (en) * | 2021-04-30 | 2021-08-03 | 宁德新能源科技有限公司 | Electrolyte solution, electrochemical device, and electronic device |
-
2021
- 2021-08-23 CN CN202110966290.5A patent/CN113594548A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810554A (en) * | 2014-07-15 | 2015-07-29 | 万向A一二三系统有限公司 | Low temperature electrolyte for lithium-ion power battery and preparation method thereof |
| CN104852087A (en) * | 2015-04-15 | 2015-08-19 | 宁德时代新能源科技有限公司 | Electrolyte additive and lithium ion battery using the same |
| CN109980282A (en) * | 2019-04-09 | 2019-07-05 | 杉杉新材料（衢州）有限公司 | A kind of low temperature resistant non-aqueous electrolyte for lithium ion cell and lithium ion battery |
| CN113206296A (en) * | 2021-04-30 | 2021-08-03 | 宁德新能源科技有限公司 | Electrolyte solution, electrochemical device, and electronic device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110752408B (en) | Electrolyte, preparation method thereof and lithium ion battery | |
| WO2020063371A1 (en) | Positive electrode piece and lithium-ion secondary battery | |
| CN109728340B (en) | Lithium ion battery | |
| CN111640985A (en) | Non-aqueous electrolyte and high-voltage lithium ion battery containing same | |
| CN108232296B (en) | Electrolyte solution and lithium secondary battery | |
| CN111525190B (en) | Electrolyte and lithium ion battery | |
| US20230231191A1 (en) | Electrolyte and electrochemical device thereof and electronic device | |
| CN109671982B (en) | High-temperature high-safety electrolyte matched with silicon-carbon negative electrode material for lithium ion battery | |
| WO2020043151A1 (en) | Positive electrode plate, preparation method therefor, and lithium-ion rechargeable battery | |
| CN112151865B (en) | Electrolyte for lithium ion battery and lithium ion battery comprising same | |
| CN110970621A (en) | Lithium ion battery | |
| CN112018446B (en) | Electrolyte suitable for silicon-carbon system lithium ion battery | |
| CN111129590A (en) | High-voltage lithium ion battery non-aqueous electrolyte and high-voltage lithium ion battery | |
| CN110808414A (en) | Non-aqueous electrolyte of lithium ion battery and lithium ion battery using same | |
| CN112467220A (en) | Electrolyte suitable for silicon-carbon system lithium ion battery | |
| CN109119599B (en) | Secondary battery and preparation method thereof | |
| CN113067033A (en) | Electrochemical device and electronic device | |
| CN110783628A (en) | Non-aqueous electrolyte of lithium ion battery and lithium ion battery using same | |
| CN116826165A (en) | Lithium secondary battery and preparation method thereof | |
| CN110808413A (en) | Non-aqueous electrolyte of lithium ion battery and lithium ion battery using same | |
| CN115036574A (en) | Non-aqueous electrolyte and lithium ion battery | |
| CN114188605A (en) | Lithium ion battery electrolyte for silicon-carbon cathode and lithium ion battery containing electrolyte | |
| CN109494402B (en) | Electrolyte and lithium battery | |
| CN113594548A (en) | Electrolyte and lithium ion battery | |
| CN112582672A (en) | Ternary lithium ion battery non-aqueous electrolyte and ternary lithium ion battery containing same |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211102 |
|
| RJ01 | Rejection of invention patent application after publication |