CN115528307A - Electrolyte and battery comprising same - Google Patents

Electrolyte and battery comprising same Download PDF

Info

Publication number
CN115528307A
CN115528307A CN202211229294.6A CN202211229294A CN115528307A CN 115528307 A CN115528307 A CN 115528307A CN 202211229294 A CN202211229294 A CN 202211229294A CN 115528307 A CN115528307 A CN 115528307A
Authority
CN
China
Prior art keywords
electrolyte
additive
lithium
substituted
battery
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
Application number
CN202211229294.6A
Other languages
Chinese (zh)
Inventor
王海
李素丽
李俊义
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhuhai Cosmx Battery Co Ltd
Original Assignee
Zhuhai Cosmx Battery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhuhai Cosmx Battery Co Ltd filed Critical Zhuhai Cosmx Battery Co Ltd
Priority to CN202211229294.6A priority Critical patent/CN115528307A/en
Publication of CN115528307A publication Critical patent/CN115528307A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0567—Liquid materials characterised by the additives
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • 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)
  • Secondary Cells (AREA)

Abstract

The invention provides an electrolyte and a battery comprising the electrolyte, wherein the electrolyte comprises a sulfonyl bipyridine compound serving as a first additive, the first additive has a lower LUMO (luteo-LUMO) orbit and a higher HOMO (highest occupied molecular orbital), is easy to oxidize and reduce and generates an interface film on the surfaces of a positive electrode and a negative electrode, and the interface film has the characteristics of high inorganic component content, high stability and rich S atoms and N atoms, can improve the transmission efficiency of lithium ions, and can improve the cycle performance of the battery; meanwhile, the first additive and the pyridine derivative which has formed a film are easy to generate polymerization reaction under the limit working condition of thermal shock, so that the short circuit of the anode and the cathode is delayed, the aggravation of side reaction is blocked, and the thermal shock performance is effectively improved.

Description

Electrolyte and battery comprising same
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to an electrolyte and a battery comprising the electrolyte.
Background
The lithium ion battery is one of main systems in a new energy market due to the advantages of high charging speed, high energy density, high voltage interval and the like, but with the continuous improvement of a voltage system, the stability of the battery is reduced, side reactions between an interface and electrolyte are intensified, so that the service life of the battery is reduced, gas is easily generated in a storage process, and thermal shock is easily caused to lose efficacy. In recent years, pursuit of a battery voltage system and energy density, continuous push-out of a positive electrode material matched with high voltage makes research on an electrolyte matched with the high voltage material important, when the voltage system exceeds the bearing capacity of the material system, excessive side reaction can accelerate consumption of the electrolyte, the service life of a lithium ion battery product is seriously influenced, and potential safety hazards of the battery can be caused, so that development of the electrolyte matched with the high voltage system is an important direction for development of the electrolyte at present.
Disclosure of Invention
In order to match a high-voltage system of the lithium ion battery, the side reaction between an electrode material and electrolyte is inhibited, the consumption of the electrolyte is reduced, and the service life and the safety performance of a lithium ion battery product are improved. The invention provides an electrolyte and a battery comprising the electrolyte; the electrolyte has good normal-high temperature cycle performance, and can also give consideration to the thermal shock performance of the battery.
The purpose of the invention is realized by the following technical scheme:
an electrolyte comprises electrolyte salt, an organic solvent and a first additive, wherein the first additive is a sulfonyl bipyridine compound.
According to an embodiment of the invention, the sulfonyl bipyridine compound is a compound containing sulfonyl and two pyridyl groups, and the two pyridyl groups are directly connected with the sulfonyl respectively.
According to an embodiment of the present invention, the first additive is at least one selected from the group consisting of compounds represented by formula 1:
Figure BDA0003880777610000021
wherein X 1 、X 2 The same or different, each independently selected from hydrogen, halogen, cyano, substituted or unsubstituted aryl, substituted or unsubstituted alkyl, substituted or unsubstitutedSubstituted alkenyl, substituted or unsubstituted alkoxy; when substituted, the substituent is alkyl, halogen, cyano;
n1 and n2 are the same or different and each independently an integer of 0 to 4.
According to an embodiment of the present invention, X 1 、X 2 Same or different, each independently selected from hydrogen, halogen, cyano, substituted or unsubstituted C 6-12 Aryl, substituted or unsubstituted C 1-12 Alkyl, substituted or unsubstituted C 2-12 Alkenyl, substituted or unsubstituted C 1-12 An alkoxy group; if substituted, the substituent is C 1-12 Alkyl, halogen, cyano.
According to an embodiment of the present invention, X 1 、X 2 Same or different, each independently selected from hydrogen, halogen, cyano, substituted or unsubstituted C 6-10 Aryl, substituted or unsubstituted C 1-6 Alkyl, substituted or unsubstituted C 2-6 Alkenyl, substituted or unsubstituted C 1-6 An alkoxy group; if substituted, the substituent is C 1-6 Alkyl, halogen, cyano.
According to an embodiment of the present invention, X 1 、X 2 Same or different, each independently selected from hydrogen, halogen, cyano, substituted or unsubstituted C 6-8 Aryl, substituted or unsubstituted C 1-3 Alkyl, substituted or unsubstituted C 2-3 Alkenyl, substituted or unsubstituted C 1-3 An alkoxy group; if substituted, the substituent is C 1-3 Alkyl, halogen, cyano.
According to an embodiment of the present invention, X 1 、X 2 Identical or different, each independently selected from hydrogen, trifluoromethyl, fluorine, cyano.
According to an embodiment of the invention, n1, n2 are the same or different and are each independently 0, 1, 2, 3 or 4.
According to an embodiment of the invention, the first additive is selected from at least one of the following compounds A1 to A5:
Figure BDA0003880777610000031
a compound A1;
Figure BDA0003880777610000032
a compound A2;
Figure BDA0003880777610000033
a compound A3;
Figure BDA0003880777610000034
a compound A4;
Figure BDA0003880777610000035
compound A5.
According to an embodiment of the invention, the first additive is present in an amount of 0.5wt% to 3wt%, such as 0.5wt%, 0.6wt%, 0.7wt%, 0.8wt%, 0.9wt%, 1wt%, 1.2wt%, 1.3wt%, 1.5wt%, 1.6wt%, 1.8wt%, 2wt%, 2.2wt%, 2.4wt%, 2.5wt%, 2.6wt%, 2.8wt%, or 3wt%, based on the total mass of the electrolyte.
According to embodiments of the present invention, the first additive may be obtained after being purchased commercially, or may be prepared by methods known in the art.
According to an embodiment of the present invention, the electrolyte salt is selected from electrolyte lithium salts.
According to an embodiment of the invention, the electrolyte lithium salt is selected from lithium hexafluorophosphate (LiPF) 6 ) Lithium difluorophosphate (LiPF) 2 O 2 ) Lithium difluorobis (oxalato) phosphate (LiPF) 2 (C 2 O 4 ) 2 ) Lithium tetrafluoro oxalate phosphate (LiPF) 4 C 2 O 4 ) Lithium oxalate phosphate (LiPO) 2 C 2 O 4 ) Lithium bis (oxalato) borate (LiBOB), lithium difluoro (oxalato) borate (LiODFB), lithium tetrafluoroborate (LiBF) 4 ) Lithium bis (fluorosulfonyl) imide (LiTFSI) and lithium bis (fluorosulfonyl) imide (LiFSI)And (4) seed preparation.
According to an embodiment of the invention, the electrolyte salt is present in an amount of 10wt% to 15wt%, such as 10wt%, 11wt%, 12wt%, 13wt%, 14wt% or 15wt%, based on the total mass of the electrolyte.
According to an embodiment of the present invention, the organic solvent is selected from at least one of Ethylene Carbonate (EC), propylene Carbonate (PC), diethyl carbonate (DEC), ethyl Propionate (EP), propyl Propionate (PP), ethyl Acetate (EA), ethyl n-butyrate (EB) and γ -butyrolactone (GBL).
According to an embodiment of the invention, the content of the organic solvent is 60wt% to 90wt%, for example 60wt%, 65wt%, 70wt%, 75wt%, 80wt%, 85wt% or 90wt%, based on the total mass of the electrolyte.
According to an embodiment of the present invention, the electrolyte further includes a second additive selected from at least one of fluoroethylene carbonate (FEC), vinylene Carbonate (VC), 1, 3-Propane Sultone (PS), vinyl sulfate (DTD), methylene Methanedisulfonate (MMDS), propylene Sultone (PST), maleic anhydride, diethanol anhydride, succinic anhydride, succinonitrile (SN), adiponitrile (ADN), ethylene glycol bis (propionitrile) ether (EGBE), and Hexanetrinitrile (HTCN).
According to an embodiment of the invention, the second additive is present in an amount of 1wt% to 15wt%, preferably 5wt% to 13wt%, e.g. 1wt%, 1.2wt%, 1.3wt%, 1.5wt%, 1.6wt%, 1.8wt%, 2wt%, 2.2wt%, 2.4wt%, 2.5wt%, 2.6wt%, 2.8wt%, 3wt%, 3.3wt%, 3.5wt%, 3.8wt%, 4wt%, 4.2wt%, 4.5wt%, 4.8wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, 10wt%, 11wt%, 12wt%, 13wt%, 14wt% or 15wt% based on the total mass of the electrolyte.
The invention also provides a preparation method of the electrolyte, which comprises the following steps:
the electrolyte is obtained after mixing an organic solvent, an electrolyte salt, a first additive and optionally a second additive.
The invention also provides a battery, which comprises the electrolyte.
According to an embodiment of the invention, the battery is a lithium ion battery.
According to an embodiment of the present invention, the battery further includes a positive electrode sheet containing a positive electrode active material, a negative electrode sheet containing a negative electrode active material, and a separator.
According to an embodiment of the present invention, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer coated on one or both surfaces of the positive electrode current collector, the positive electrode active material layer including a positive electrode active material, a conductive agent, and a binder.
According to an embodiment of the present invention, the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer coated on one or both surfaces of the negative electrode current collector, the negative electrode active material layer including a negative electrode active material, a conductive agent, and a binder.
According to the embodiment of the invention, the mass percentage of each component in the positive electrode active material layer is as follows: 80-99.8 wt% of positive active material, 0.1-10 wt% of conductive agent and 0.1-10 wt% of binder.
Preferably, the positive electrode active material layer comprises the following components in percentage by mass: 90-99.6 wt% of positive active material, 0.2-5 wt% of conductive agent and 0.2-5 wt% of binder.
According to the embodiment of the invention, the mass percentage of each component in the negative electrode active material layer is as follows: 80-99.8 wt% of negative electrode active material, 0.1-10 wt% of conductive agent and 0.1-10 wt% of binder.
Preferably, the negative electrode active material layer comprises the following components in percentage by mass: 90 to 99.6 weight percent of negative electrode active material, 0.2 to 5 weight percent of conductive agent and 0.2 to 5 weight percent of binder.
According to an embodiment of the present invention, the conductive agent is selected from at least one of conductive carbon black, acetylene black, ketjen black, conductive graphite, conductive carbon fiber, carbon nanotube, and metal powder.
According to an embodiment of the present invention, the binder is selected from at least one of sodium carboxymethylcellulose, styrene-butadiene latex, polytetrafluoroethylene, polyethylene oxide.
According to an embodiment of the present invention, the negative electrode material is selected from nano silicon (Si), silicon oxygen negative electrode material (SiO) x (0<x<2) Silicon carbon negative electrode material, artificial graphite, natural graphite, mesocarbon microbeads, hard carbon, soft carbon, lithium metal and lithium titanate.
According to an embodiment of the present invention, the positive active material is selected from lithium transition metal composite oxides selected from LiMO 2 (M＝Ni、Co、Mn)、LiMn 2 O 4 、LiMPO 4 (M＝Fe、Mn、Co)、LiNi x Mn 1-x O 2 (M＝Co、Mn)、LiNixCo y M 1 x y O 2 Wherein x is more than or equal to 0, y is less than or equal to 1, and x + y is less than or equal to 1; wherein M is one or more of Mg, zn, ga, ba, al, fe, cr, sn, V, mn, sc, ti, nb, mo, zr, ta, W, B, F and Si.
Advantageous effects
The invention provides an electrolyte and a battery comprising the electrolyte, wherein the electrolyte comprises a sulfonyl bipyridine compound serving as a first additive, the first additive has a lower LUMO (luteo-LUMO) orbit and a higher HOMO (highest occupied molecular orbital), is easy to oxidize and reduce and generates an interface film on the surfaces of a positive electrode and a negative electrode, and the interface film has the characteristics of high inorganic component content, high stability and rich S atoms and N atoms, can improve the transmission efficiency of lithium ions, and can improve the cycle performance of the battery; meanwhile, the first additive and the formed pyridine derivative are easy to generate polymerization reaction under the limit working condition of thermal shock, so that the short circuit of the anode and the cathode is delayed, the aggravation of side reaction is blocked, and the thermal shock performance is effectively improved.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It is to be understood that the following examples are only illustrative and explanatory of the present invention and should not be construed as limiting the scope of the present invention. All the technologies realized based on the above-mentioned contents of the present invention are covered in the protection scope of the present invention.
The experimental methods used in the following examples are all conventional methods unless otherwise specified; reagents, materials and the like used in the following examples are commercially available unless otherwise specified.
In the description of the present invention, it should be noted that the terms "first", "second", etc. are used for descriptive purposes only and do not indicate or imply relative importance.
The preparation method of the lithium ion battery comprises the following steps:
[ preparation of Positive electrode sheet ]
Mixing a positive electrode active material Lithium Cobaltate (LCO), a binder polyvinylidene fluoride (PVDF), conductive carbon black and a single-walled carbon nanotube according to a weight ratio of 97.2; uniformly coating the positive electrode slurry on a current collector aluminum foil; baking the coated aluminum foil in 5 sections of baking ovens with different temperature gradients, drying the aluminum foil in a baking oven at 120 ℃ for 8 hours, and rolling and cutting to obtain the required positive plate.
[ preparation of negative electrode sheet ]
Mixing artificial graphite serving as a negative electrode active material, sodium carboxymethyl cellulose (CMC-Na) serving as a thickening agent, styrene butadiene rubber serving as a binder and acetylene black serving as a conductive agent according to a weight ratio of 97; uniformly coating the negative electrode slurry on the high-strength carbon-coated copper foil to obtain a pole piece; and (3) airing the obtained pole piece at room temperature, transferring the pole piece to an oven at 80 ℃ for drying for 10h, and then rolling and slitting to obtain the negative pole piece.
[ preparation of electrolyte ]
In a glove box filled with inert gas (H) 2 O<10ppm，O 2 <5 ppm), ethylene carbonate, ethyl methyl carbonate, and diethyl carbonate were mixed at a mass ratio of EC: PC: DEC =1 = 2 6 ) And obtaining the basic electrolyte after the water and free acid are qualified through detection. Addition of the base electrolyte with the additives of Table 1The electrolytes of the respective examples and comparative examples were obtained with the same contents of the first additive and the second additive.
[ production of Battery ]
And (3) stacking the prepared positive plate, the diaphragm (a PP film with the thickness of 9 microns) and the negative plate in sequence, ensuring that the diaphragm is positioned between the positive plate and the negative plate to play a role of isolation, putting the bare cell into an aluminum-plastic film outer package, injecting the prepared electrolyte into the dried battery, packaging, standing, forming, shaping and grading to finish the preparation of the lithium ion soft package battery.
Examples 1 to 10 and comparative examples 1 to 4 were prepared according to the above-mentioned preparation method.
TABLE 1 composition of electrolyte of batteries of examples and comparative examples
First additive and content Second additive and content
Example 1 0.5wt% of Compound A1 FEC:8.0wt％/PS:3.0wt％
Example 2 Compound A1:1.0wt% FEC:8.0wt％/PS:3.0wt％
Example 3 Compound A1:2.0wt% FEC:8.0wt％/PS:3.0wt％
Example 4 Compound A1:3.0wt% FEC:8.0wt％/PS:3.0wt％
Example 5 Compound A2:1.0wt% FEC:8.0wt％/PS:3.0wt％
Example 6 Compound A3:1.0wt% FEC:8.0wt％/PS:3.0wt％
Example 7 Compound A4:1.0wt% FEC:8.0wt％/PS:3.0wt％
Example 8 Compound A5:1.0wt% FEC:8.0wt％/PS:3.0wt％
Example 9 Compound A1:1.0wt% FEC:8.0wt％
Example 10 Compound A1:1.0wt% PS:3.0wt％
Comparative example 1 / /
Comparative example2 / FEC:8.0wt％
Comparative example 3 / PS:3.0wt％
Comparative example 4 / FEC:8.0wt％/PS:3.0wt％
Performance testing
The lithium ion batteries and the electrolytes thereof obtained in the above examples and comparative examples were subjected to a relevant performance test.
(1) High-temperature cycle performance test: at 45 ℃, the battery after capacity grading is charged to 4.48V at constant current and constant voltage of 0.7C, the current is cut off at 0.05C, then the battery is discharged to 3.0V at constant current of 0.5C, and the capacity retention rate in 500 weeks is calculated after the battery is charged and discharged for 500 cycles according to the circulation, wherein the calculation formula is as follows: cycle capacity retention rate (%) at 500 weeks (= (cycle discharge capacity at 500 weeks/first cycle discharge capacity) × 100%.
(2) And (3) testing the normal-temperature cycle performance: at 25 ℃, the battery after capacity grading is charged to 4.48V at constant current and constant voltage of 0.7C, the current is cut off at 0.05C, then the battery is discharged to 3.0V at constant current of 0.5C, and the capacity retention rate at 500 weeks is calculated after the battery is charged and discharged for 500 cycles according to the cycle, wherein the calculation formula is as follows: cycle capacity retention (%) at 500 weeks (= cycle discharge capacity at 500 weeks/first cycle discharge capacity) × 100%.
(3) Thermal shock performance: discharging to 3.0V at 25 ℃ at a given current of 0.2C; standing for 5min; charging to 4.48V at a charging current of 0.2C, and changing to 4.48V constant-voltage charging when the cell voltage reaches 4.48V until the charging current is less than or equal to a given cutoff current of 0.05C; and (3) placing the battery cell into an oven after standing for 1h, raising the temperature of the oven to 135 +/-2 ℃ at the speed of 5 +/-2 ℃/min, keeping for 30min, and stopping, wherein the judgment standard is that the battery cell does not catch fire and does not explode.
Table 2 results of performance test of batteries of examples and comparative examples
Figure BDA0003880777610000091
As can be seen from a comparison of the test results of comparative example 4 and examples 1 to 10 in Table 2: in the embodiment, the first additive is added, so that the normal-temperature and high-temperature cycle performance and the thermal shock performance of the lithium ion battery can be effectively improved.
Comparison of comparative examples 1 to 4 with examples 1 to 10 shows that: the thermal shock performance of the battery can be obviously improved by adding the first additive, and the thermal shock performance of the battery is improved more obviously along with the increase of the addition amount of the first additive, and the possible reason is that under the thermal shock working condition, the anode and the cathode can be isolated by the accelerated polymerization of the first additive, and meanwhile, the blocking effect is more obvious as the addition amount of the first additive is higher, so that the thermal shock performance of the battery is effectively improved.
Comparison of comparative example 4 with examples 1 to 3 shows that: the first additive is in a proper amount range (0.5-3 wt%) to improve the cycle performance, the cycle performance is not obviously improved when the addition amount is excessive, and the cycle performance is possibly caused by overlarge polarization due to the increase of the addition amount;
in conclusion, the electrolyte provided by the invention can effectively improve the cycle and thermal shock performance and has extremely high application potential.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The electrolyte is characterized by comprising electrolyte salt, an organic solvent and a first additive, wherein the first additive is a sulfonyl bipyridine compound.
2. The electrolyte of claim 1, wherein the sulfonyl bipyridine compound is a compound containing a sulfonyl group and two pyridyl groups, and the two pyridyl groups are directly connected to the sulfonyl group respectively.
3. The electrolyte of claim 1, wherein the first additive is at least one selected from compounds represented by formula 1:
Figure FDA0003880777600000011
wherein X 1 、X 2 The same or different, each is independently selected from hydrogen, halogen, cyano, substituted or unsubstituted aryl, substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted alkoxy; when substituted, the substituent is alkyl, halogen, cyano;
n1 and n2 are the same or different and each independently an integer of 0 to 4.
4. The electrolyte of claim 1, wherein the first additive is selected from at least one of the following compounds A1 to A5:
Figure FDA0003880777600000012
Figure FDA0003880777600000021
5. the electrolyte of claim 1, wherein the first additive is present in an amount of 0.5 to 3wt% based on the total mass of the electrolyte.
6. The electrolyte of claim 1, wherein the electrolyte is characterized byThe electrolyte salt is selected from electrolyte lithium salts selected from lithium hexafluorophosphate (LiPF) 6 ) Lithium difluorophosphate (LiPF) 2 O 2 ) Lithium difluorobis (oxalato) phosphate (LiPF) 2 (C 2 O 4 ) 2 ) Lithium tetrafluoro oxalate phosphate (LiPF) 4 C 2 O 4 ) Lithium oxalate phosphate (LiPO) 2 C 2 O 4 ) Lithium bis (oxalato) borate (LiBOB), lithium difluoro (oxalato) borate (LiODFB), lithium tetrafluoroborate (LiBF) 4 ) At least one of lithium bis (fluorosulfonyl) imide (LiTFSI) and lithium bis (fluorosulfonyl) imide (LiFSI); and/or the content of the electrolyte salt accounts for 10-15 wt% of the total mass of the electrolyte.
7. The electrolyte of claim 1, wherein the organic solvent is selected from at least one of Ethylene Carbonate (EC), propylene Carbonate (PC), diethyl carbonate (DEC), ethyl Propionate (EP), propyl Propionate (PP), ethyl Acetate (EA), ethyl n-butyrate (EB), and gamma-butyrolactone (GBL); and/or the content of the organic solvent accounts for 60-90 wt% of the total mass of the electrolyte.
8. The electrolyte of claim 1, further comprising a second additive selected from at least one of fluoroethylene carbonate (FEC), vinylene Carbonate (VC), 1, 3-Propane Sultone (PS), vinyl sulfate (DTD), methylene Methanedisulfonate (MMDS), propylene Sultone (PST), maleic anhydride, diethanol anhydride, succinic anhydride, succinonitrile (SN), adiponitrile (ADN), ethylene glycol bis (propionitrile) ether (EGBE), and Hexanetrinitrile (HTCN).
9. The electrolyte of claim 8, wherein the second additive is present in an amount of 1wt% to 15wt% based on the total mass of the electrolyte.
10. A battery comprising the electrolyte of any one of claims 1-9.
CN202211229294.6A 2022-10-09 2022-10-09 Electrolyte and battery comprising same Pending CN115528307A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211229294.6A CN115528307A (en) 2022-10-09 2022-10-09 Electrolyte and battery comprising same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211229294.6A CN115528307A (en) 2022-10-09 2022-10-09 Electrolyte and battery comprising same

Publications (1)

Publication Number Publication Date
CN115528307A true CN115528307A (en) 2022-12-27

Family

ID=84702378

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211229294.6A Pending CN115528307A (en) 2022-10-09 2022-10-09 Electrolyte and battery comprising same

Country Status (1)

Country Link
CN (1) CN115528307A (en)

Similar Documents

Publication Publication Date Title
CN110931868B (en) Non-aqueous electrolyte and lithium ion battery containing same
CN115458810B (en) Electrolyte and lithium ion battery
CN111430801B (en) Electrolyte of lithium ion secondary battery and application thereof
CN114094187B (en) Non-aqueous electrolyte and battery comprising same
CN111668547B (en) Nonaqueous electrolyte solution and electricity storage device using same
CN116914245A (en) Electrolyte and battery comprising same
CN114865089A (en) Electrolyte and battery comprising same
CN115441057A (en) Electrolyte and battery comprising same
CN115832433A (en) Electrolyte and battery comprising same
CN115312861A (en) Electrolyte comprises battery of the electrolyte
CN115295881A (en) Electrolyte additive, electrolyte and secondary battery
CN115528307A (en) Electrolyte and battery comprising same
CN115799637A (en) Electrolyte and battery comprising same
CN116779974B (en) Nonaqueous electrolyte and secondary battery
CN110649317A (en) Silicon-based lithium ion battery electrolyte and lithium ion secondary battery
CN116387620A (en) Electrolyte and battery comprising same
CN116505077A (en) Electrolyte and battery comprising same
CN116864803A (en) Electrolyte and battery comprising same
CN117525595A (en) Electrolyte and secondary battery comprising same
CN117832614A (en) Secondary battery
CN116387618A (en) Electrolyte and battery
CN117673467A (en) Electrolyte and battery comprising same
CN117096419A (en) Electrolyte and battery comprising same
CN117525592A (en) Electrolyte and battery
CN116344942A (en) Electrolyte and battery

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination