CN115411369A - Electrolyte, preparation method thereof and electrochemical device - Google Patents

Electrolyte, preparation method thereof and electrochemical device Download PDF

Info

Publication number
CN115411369A
CN115411369A CN202211233095.2A CN202211233095A CN115411369A CN 115411369 A CN115411369 A CN 115411369A CN 202211233095 A CN202211233095 A CN 202211233095A CN 115411369 A CN115411369 A CN 115411369A
Authority
CN
China
Prior art keywords
electrolyte
organic solvent
solvent
lithium
conductivity
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.)
Granted
Application number
CN202211233095.2A
Other languages
Chinese (zh)
Other versions
CN115411369B (en
Inventor
周文扬
廖颖
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.)
Xiamen Hithium Energy Storage Technology Co Ltd
Original Assignee
Xiamen Hithium Energy Storage Technology 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 Xiamen Hithium Energy Storage Technology Co Ltd filed Critical Xiamen Hithium Energy Storage Technology Co Ltd
Priority to CN202211233095.2A priority Critical patent/CN115411369B/en
Publication of CN115411369A publication Critical patent/CN115411369A/en
Application granted granted Critical
Publication of CN115411369B publication Critical patent/CN115411369B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • H01M10/0569—Liquid materials characterised by the solvents
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—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
    • H01M2300/0028—Organic electrolyte characterised by the solvent
    • H01M2300/0037—Mixture of solvents
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Secondary Cells (AREA)
  • Primary Cells (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)

Abstract

The present application provides an electrolyte comprising a lithium salt and a solvent, the solvent comprising a cyclic organic solvent and a chain organic solvent, wherein e = k σ ·σ‑k μ ·μ‑k γ ·γ+k ε Wherein ε is a dielectric constant of the solvent, σ is a conductivity of the electrolyte, μ is a viscosity of the electrolyte, γ is a mass ratio of the cyclic organic solvent to the chain organic solvent, and k is σ K is 7.14 to 8.74 μ Has a k of 30.15 to 36.85 γ Is 56 to 112,k ε Is 79.7-99.8. The electrolyte can give consideration to conductivity, viscosity and dielectric constant of the solvent, the viscosity cannot be excessively increased while the conductivity of the electrolyte is improved, the high dielectric constant of the solvent can promote dissociation of lithium salt, the conductivity of the electrolyte is further improved, and the multiplying power performance of an electrochemical device is favorably improved. The application also provides a preparation method of the electrolyteAnd an electrochemical device.

Description

Electrolyte, preparation method thereof and electrochemical device
Technical Field
The application relates to the technical field of electrochemical devices, in particular to an electrolyte, a preparation method thereof and an electrochemical device.
Background
In the related art, researchers often increase the conductivity of the electrolyte by increasing the concentration of the lithium salt in order to expect improvement of the rate performance of the lithium ion battery. However, the increase of the concentration of the lithium salt can obviously improve the viscosity of the electrolyte, and the continuous addition of the lithium salt after the concentration of the lithium salt is saturated can cause the crystallization of the lithium salt, further increase the viscosity of the electrolyte and influence the improvement of the conductivity.
Disclosure of Invention
In view of this, the application provides an electrolyte, a preparation method thereof, and an electrochemical device, in which the conductivity of the electrolyte is improved by changing the dielectric constant of a solvent in the electrolyte, and the viscosity of the electrolyte is not improved, thereby facilitating the improvement of the rate capability of the electrochemical device.
In a first aspect, the present application provides an electrolyte comprising a lithium salt and a solvent comprising a cyclic organic solvent and a chain organic solvent, wherein ∈ = k σ ·σ-k μ ·μ-k γ ·γ+k ε Wherein ε is a dielectric constant of the solvent, σ is a conductivity of the electrolyte, μ is a viscosity of the electrolyte, γ is a mass ratio of the cyclic organic solvent to the chain organic solvent, and k is σ Is 7.14 to 8.74, the k μ Is 30.15 to 36.85, the k is γ Is 56 to 112, the k is ε Is 79.7-99.8.
Optionally, γ is 0.05 to 20. Further, gamma is 0.05-1.
Optionally, ε is 5-50. Furthermore, the epsilon is 10-25.
Optionally, σ is greater than 10.
Optionally, μ is 1.9-2.4.
Optionally, the cyclic organic solvent includes at least one of ethylene carbonate, propylene carbonate, dioxolane, and sulfolane.
Optionally, the chain organic solvent includes at least one of dimethyl carbonate, diethyl carbonate, methylethyl carbonate, ethyl acetate, methyl acetate, propyl propionate, ethyl butyrate, ethyl propionate, 1, 2-dimethoxyethane, diglyme, tetramethylsilane, and adiponitrile.
Optionally, the cyclic organic solvent comprises a cyclic carbonate.
Optionally, the chain organic solvent includes a chain carbonate.
Optionally, the concentration of the lithium salt in the electrolyte is 0.8mol/L to 1.2mol/L.
Optionally, the lithium salt comprises at least one of lithium hexafluorophosphate, lithium bistrifluoromethylsulfonyl imide, lithium bistrifluorosulfonimide, lithium tetrafluoroborate, lithium bisoxalato borate and lithium difluorooxalato borate.
Optionally, the electrolyte further comprises an additive, and the mass content of the additive in the electrolyte is 1% -8%.
Optionally, the additive comprises at least one of vinylene carbonate, fluoroethylene carbonate, 1, 3-propane sultone, vinyl sulfate, tris (trimethylsilyl) phosphate, tris (trimethylsilyl) borate, methyl methanedisulfonate, ethylene carbonate, lithium bis (oxalato) borate, lithium difluoro (oxalato) borate, and lithium difluoro (phosphorodifluoride).
In a second aspect, the present application provides a method for preparing an electrolyte, comprising: according to epsilon' = k σ ·σ’-k μ ·μ’-k γ ·γ+k ε Obtaining a mass ratio of a cyclic organic solvent to a chain organic solvent by using a preset dielectric constant of a solvent, a preset conductivity of an electrolyte and a preset viscosity of the electrolyte, wherein epsilon ' is the preset dielectric constant of the solvent, sigma ' is the preset conductivity of the electrolyte, mu ' is the preset viscosity of the electrolyte, and gamma is the mass ratio of the cyclic organic solvent to the chain organic solvent; mixing a cyclic organic solvent and a chain organic solvent according to the mass ratio of the cyclic organic solvent to the chain organic solvent to obtain the solvent; mixing the solvent with a lithium salt to obtain the electrolyte, wherein epsilon = k σ ·σ-k μ ·μ-k γ ·γ+k ε The epsilon is the dielectric constant of the solvent, the sigma is the conductivity of the electrolyte, the mu is the viscosity of the electrolyte, and the k is σ Is 7.14 to 8.74, the k μ Is 30.15 to 36.85, the k is γ Is 56 to 112, the k is ε Is 79.7-99.8.
In a third aspect, the present application provides an electrochemical device comprising the electrolyte solution of the first aspect or the electrolyte solution prepared by the preparation method of the second aspect.
The method is based on the dielectric constant of the solvent, the dissociation of the lithium salt is more sufficient along with the increase of the dielectric constant of the solvent, the viscosity of the electrolyte is proper, and the migration speed of dissociated lithium ions can be kept at a higher level, so that the conductivity of the electrolyte is improved; by the formula, the matching proportion of the annular organic solvent and the chain-shaped organic solvent can be obtained according to the required conductivity, viscosity and dielectric constant, so that the electrolyte with the required performance is obtained; the electrolyte that this application provided simultaneously can compromise the dielectric constant of conductivity, viscosity and solvent to can not too much increase viscosity when improving electrolyte conductivity, and the high dielectric constant of solvent can further promote the dissociation of lithium salt, and then further promotes the conductivity of electrolyte, is favorable to its use in electrochemical device, shows the multiplying power performance that promotes electrochemical device.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a graph showing the results of battery performance tests.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the embodiments of the present application, and it should be apparent that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The application provides an electrolyte, which comprises a lithium salt and a solvent, wherein the solvent comprises a cyclic organic solvent and a chain organic solvent, and epsilon = k σ ·σ-k μ ·μ-k γ ·γ+k ε And ε is the dielectric constant of the solvent,σ is the conductivity of the electrolyte, μ is the viscosity of the electrolyte, γ is the mass ratio of the cyclic organic solvent to the chain organic solvent, k σ Is in the range of 7.14 to 8.74 μ Has a k of 30.15 to 36.85 γ Is 56 to 112,k ε Is 79.7-99.8.
The improvement of the conductivity of the electrolyte is an important way to improve the electrical performance of the electrochemical device, however, the viscosity of the electrolyte can be increased by increasing the lithium salt, and along with the saturation of the concentration of the lithium salt, after the lithium salt is continuously added, the lithium salt cannot be completely dissociated, crystals can be generated, the viscosity of the electrolyte is further improved, the improvement of the conductivity of the electrolyte is influenced, and the increase of the lithium salt also improves the preparation cost of the electrolyte. By adjusting the dielectric constant of the solvent, the viscosity and the conductivity of the electrolyte, the conductivity of the electrolyte is improved without additionally increasing lithium salt, and meanwhile, the viscosity of the electrolyte is not increased; the method is based on the dielectric constant of the solvent, the dissociation of the lithium salt is more sufficient along with the increase of the dielectric constant of the solvent, the viscosity of the electrolyte is proper, and the migration speed of dissociated lithium ions can be kept at a higher level, so that the conductivity of the electrolyte is improved; through the formula, the matching proportion of the annular organic solvent and the chain organic solvent can be obtained according to the required conductivity, viscosity and dielectric constant, so that the electrolyte with the required performance can be obtained, and the electrical performance of the electrochemical device can be improved.
In this application, ε is the dielectric constant of the solvent; by increasing the dielectric constant of the solvent, the dissociation condition of the lithium salt can be increased, and thus the conductivity of the electrolyte can be improved without increasing the viscosity. In an embodiment of the present application, ε is 5 to 50. In this case, the solvent has a high dielectric constant, and can further promote sufficient dissociation of the lithium salt, contributing to improvement of the electrolyte conductivity. Specifically, ε may be, but is not limited to, 5, 7, 10, 12, 15, 19, 20, 22, 25, 28, 30, 33, 35, 38, 40, 43, 45, or 50, etc. In one embodiment of the present application, epsilon may be 10 to 25, which may achieve sufficient dissociation of lithium salt, and improve the conductivity of the electrolyte. In one embodiment, ε may be 10-15. The dielectric constant range is easier to obtain, and the viscosity of the solvent with the dielectric constant is proper, so that the conductivity of the electrolyte is improved. In another embodiment, ε may be 15-20. In yet another embodiment, ε may be 20-25.
In an embodiment of the present application, the cyclic organic solvent includes at least one of ethylene carbonate, propylene carbonate, dioxolane, and sulfolane. The cyclic organic solvent has a high dielectric constant, and is beneficial to sufficient dissociation of lithium salt, thereby being beneficial to improvement of the conductivity of the electrolyte.
In an embodiment of the present application, the chain organic solvent includes at least one of dimethyl carbonate, diethyl carbonate, methylethyl carbonate, ethyl acetate, methyl acetate, propyl propionate, ethyl butyrate, ethyl propionate, 1, 2-dimethoxyethane, diglyme, tetramethylsilane, and adiponitrile. The chain organic solvent has low viscosity and proper dielectric constant, and can ensure the viscosity of the solvent to be at a lower level when being matched with the annular organic solvent, so that the viscosity of the electrolyte is not excessively improved.
In an embodiment of the present application, the cyclic organic solvent includes a cyclic carbonate. The cyclic carbonate has a high dielectric constant, and is beneficial to sufficient dissociation of lithium salt, thereby being beneficial to improvement of the conductivity of the electrolyte. In an embodiment of the present application, the cyclic carbonate may include, but is not limited to, at least one of ethylene carbonate and propylene carbonate.
In the embodiment of the present application, the chain organic solvent includes a chain carbonate. The chain carbonate has low viscosity and proper dielectric constant, and can ensure the viscosity of the solvent to be at a lower level when being matched with the cyclic organic solvent, so that the viscosity of the electrolyte is not excessively improved. In an embodiment of the present application, the chain carbonate may include, but is not limited to, at least one of dimethyl carbonate, diethyl carbonate, and ethyl methyl carbonate.
In the present application, γ is a mass ratio of the cyclic organic solvent to the chain organic solvent; by controlling the mass ratio of the annular organic solvent to the chain-shaped organic solvent, the problem that the viscosity of the electrolyte is too high due to too much content of the annular organic solvent can be avoided, and the problem that the dielectric constant of the chain-shaped organic solvent is small so that the dielectric constant of the solvent and the conductivity of the electrolyte cannot be increased can also be avoided. In the embodiment of the present application, γ is 0.05 to 20, which is advantageous for obtaining a solvent having a suitable viscosity and dielectric constant. Specifically, γ may be, but not limited to, 0.05, 0.08, 0.1, 0.12, 0.2, 0.25, 0.3, 0.33, 0.4, 0.46, 0.5, 0.51, 0.6, 0.67, 0.7, 0.75, 0.8, 0.84, 0.9, 0.92, 1, 5, 8, 10, 13, 15, 18, or 20, and the like. In an embodiment of the present application, γ may be 0.05 to 1, which is beneficial to further reduce the viscosity of the electrolyte, and simultaneously may also increase the dielectric constant of the solvent, thereby contributing to increase the conductivity of the electrolyte. Specifically, γ may be, but is not limited to, 0.05 to 0.2, 0.2 to 0.5, 0.5 to 0.75, or 0.75 to 1, and the like.
In the present application, k γ Coefficient of γ, k γ Is 56-112. In one embodiment, k γ And may be 56-78. In another embodiment, k γ And may be 70-100. In yet another embodiment, k γ And may range from 85 to 112.
In the present application, μ is the viscosity of the electrolyte, wherein the viscosity is measured by an Ubbelohde viscometer under the environmental conditions of a temperature of 25 + -1 deg.C, a humidity of not more than 2%, and the unit of the viscosity is mPas. In an embodiment of the present application, μ is 1.9 to 3.5. Specifically, μmay be, but is not limited to, 1.9, 2, 2.1, 2.15, 2.2, 2.25, 2.3, 2.35, 2.4, 2.5, 2.8, 3, 3.3, or 3.5, etc. The viscosity of the electrolyte is difficult to reach a lower level, if the viscosity is reduced by increasing the solvent, the concentration of lithium salt is reduced, and the conductivity of the electrolyte is influenced, so that the capacity and the charging and discharging speed of the electrochemical device are influenced; when the viscosity of the electrolyte is too high, the dissociation degree of the lithium salt is increased, so that the conductivity of the electrolyte is influenced, and the capacity and the charge-discharge speed of the electrochemical device are further influenced; therefore, the viscosity range is proper, dissociation of lithium salt and improvement of electrolyte conductivity are not influenced, and the capacity and the charging and discharging speed of the electrochemical device are improved. In one embodiment, μmay be 1.9 to 2.4, which is beneficial to improving the discharging speed of the electrolyte, preventing liquid spraying and overflowing after liquid injection, and improving the wetting effect of the anode and the cathode in the electrochemical device, thereby improving the stability of the formed SEI film (solid electrolyte interface). In another embodiment, μmay be 2-2.3. In yet another embodiment, μmay be 2.2-2.4. In yet another embodiment, μmay be 2.3-3.3.
In the present application, k μ Coefficient of viscosity μ, k μ Is 30.15-36.85. In one embodiment, k μ Is 32-33. In another embodiment, k μ Is 33-34.5. In yet another embodiment, k μ Is 35-36.85.
In the embodiment of the present application, the viscosity of the solution is 1.9 mPas to 2.4 mPas. In the present application, the conductivity of the electrolyte is improved by improving the composition of the solvent, and the concentration of the lithium salt is not excessively increased in the process, so that the viscosity of the solvent is not excessively influenced by the lithium salt, that is, the viscosity of the electrolyte is not greatly different from that of the solvent. Specifically, the viscosity of the solution may be, but not limited to, 1.9 mPas, 2 mPas, 2.1 mPas, 2.2 mPas, 2.3 mPas or 2.4 mPas. In one embodiment, the viscosity of the solution may be from 1.9 mPas to 2.1 mPas. In another embodiment, the viscosity of the dissolution may be 2 mPas-2.2 mPas. In a further embodiment, the viscosity of the dissolution may be from 2.2 mPas to 2.4 mPas. It is understood that the viscosity of the solution is measured by Ubbelohde viscometer under the condition of 25 + -1 deg.C and 2% or less of humidity.
In the present application, σ is the conductivity of the electrolyte, wherein the conductivity is detected by a conductivity meter, the detected environmental conditions are a temperature of 25 ± 1 ℃, a humidity of not more than 2%, and the unit of the conductivity is ms/cm.
In the embodiments of the present application, σ is 9 or more. That is to say, the electrolyte has higher conductivity, and can avoid the problems of large internal resistance, large polarization and electric performance attenuation of an electrochemical device caused by excessively low conductivity, so that the adoption of the conductivity range is beneficial to improving the electric performance of the electrochemical device. Specifically, σ can be, but is not limited to, greater than or equal to 9, 10, 11, 12, 13, 14, or 15, and the like. In one embodiment, σ may be 9-16. The use of this conductivity range also avoids the problem of lithium dendrites due to too high conductivity, and thus the use of the above conductivity range is beneficial to further improving the performance of the electrochemical device. In another embodiment, σ may be 10-15. In yet another embodiment, σ may be 11-13.
In this application, k σ Coefficient of conductivity σ, k σ Is 7.14-8.74. In one embodiment, k σ Is 7.14-7.64. In another embodiment, k σ Is 7.64-7.98. In yet another embodiment, k σ Is 7.98-8.74.
In the present application, k ε Is a constant number, k ε Is 79.7-99.8. In one embodiment, k ε Is 80-88. In another embodiment, k ε Is 85.26-93.77. In yet another embodiment, k ε Is 89.41-99.8.
In the embodiment of the present application, the concentration of the lithium salt in the electrolyte is 0.8mol/L to 1.2mol/L. In the range, the problems of overlarge viscosity of the electrolyte, increased crystallization probability of the lithium salt and low liquid discharging speed of the electrolyte caused by overhigh concentration of the lithium salt can be avoided, and the problems that the conductivity caused by overlow concentration of the lithium salt is overlow and the charging and discharging speed and capacitance of an electrochemical device are influenced can be avoided, so that the viscosity of the electrolyte is not excessively increased while the conductivity of the electrolyte is improved, the improvement of the performance of the electrolyte is facilitated, and the electrical property of the electrochemical device is improved. Specifically, the concentration of the lithium salt in the electrolyte may be, but not limited to, 0.8mol/L, 0.9mol/L, 1mol/L, 1.1mol/L, 1.2mol/L, or the like.
In an embodiment of the present application, the lithium salt includes lithium hexafluorophosphate (LiPF) 6 ) Lithium bistrifluoromethylsulfonyl imide (LiTFSI), lithium bistrifluorosulfonimide (LiFSI), lithium tetrafluoroborate (LiBF) 4 ) At least one of lithium bis (oxalato) borate (LiBOB) and lithium difluoro (oxalato) borate (LiODFB). The lithium salt has good solubility in an organic solvent and is easy to dissociate, which is beneficial to improving the conductivity of the electrolyte.
In an embodiment of the present application, the electrolyte further includes an additive. The performance of the electrolyte is improved by adding additives. In an embodiment of the present application, the additive comprises at least one of vinylene carbonate, fluoroethylene carbonate, 1, 3-propane sultone, vinyl sulfate, tris (trimethylsilyl) phosphate, tris (trimethylsilyl) borate, methylene methyldi-sulfonate, ethylene carbonate, lithium bis (oxalato) borate, lithium difluoro (oxalato) borate, and lithium difluoro (phosphorodifluoride). The material can be used as a film forming additive, is beneficial to forming a stable SEI film, reduces the co-intercalation of a solvent, reduces the lithium precipitation condition during charging and discharging, and improves the cycle performance of an electrochemical device. It is understood that the additives may also include other substances, such as flame retardant additives, conductive additives, and the like. In the embodiment of the application, the mass content of the additive in the electrolyte is 1-8%. The additive with the content range can avoid the problems that the electrolyte and the electrochemical device cannot be obviously improved due to too low content, and the electrochemical device consumes too much lithium in one charge-discharge cycle and the battery capacity is attenuated too fast due to too high content, so that the electrical properties of the electrolyte and the electrochemical device can be obviously improved due to the content range. Specifically, the mass content of the additive in the electrolyte solution may be, but not limited to, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, or the like. In one embodiment, the additive is present in the electrolyte in an amount of 2% to 5% by weight. In another embodiment, the additive is present in the electrolyte in an amount of 4% to 8% by mass. In yet another embodiment, the additive is present in the electrolyte in an amount of 3% to 7% by mass.
The application also provides a preparation method of the electrolyte, which comprises the following steps: according to ε' = k σ ·σ’-k μ ·μ’-k γ ·γ+k ε Obtaining the mass ratio of the cyclic organic solvent to the chain-shaped organic solvent by using the preset dielectric constant of the solvent, the preset conductivity of the electrolyte and the preset viscosity of the electrolyte, wherein epsilon ' is the preset dielectric constant of the solvent, sigma ' is the preset conductivity of the electrolyte, mu ' is the preset viscosity of the electrolyte, and gamma is the mass ratio of the cyclic organic solvent to the chain-shaped organic solvent; mixing the cyclic organic solvent and the chain organic solvent according to the mass ratio of the cyclic organic solvent to the chain organic solvent to obtain a solvent; mixing a solvent with a lithium salt to obtain an electrolyte solution, wherein epsilon = k σ ·σ-k μ ·μ-k γ ·γ+k ε ε is the dielectric constant of the solvent,. Sigma.is the conductivity of the electrolyte,. Mu.is the viscosity of the electrolyte, k σ K is 7.14 to 8.74 μ K is 30.15 to 36.85 γ Is 56 to 112,k ε Is 79.7-99.8. The preparation method of the electrolyte is simple and convenient to operate, and the electrolyte with preset conductivity can be prepared; the electrolytic solution according to any one of the above embodiments can be produced by this production method.
In the present application, according to ε' = k σ ·σ’-k μ ·μ’-k γ ·γ+k ε Setting a preset dielectric constant of the solvent, a preset conductivity of the electrolyte and a preset viscosity of the electrolyte, and calculating to obtain a mass ratio of the annular organic solvent to the chain-shaped organic solvent; and mixing the cyclic organic solvent and the chain organic solvent according to the mass ratio of the cyclic organic solvent to the chain organic solvent, and adding lithium salt to obtain the required electrolyte. In the process, the solvent has a high dielectric constant, the electrolyte has a high conductivity and an appropriate viscosity, so that the mass ratio of the cyclic organic solvent to the chain organic solvent can be obtained, and how to prepare the solution and how to prepare the electrolyte can be known.
As can be appreciated, ε' is the pre-set dielectric constant of the solvent, ε is the actual measured dielectric constant of the solvent; sigma' is the preset conductivity of the electrolyte, and sigma is the actually measured conductivity of the electrolyte; μ' is a preset viscosity of the electrolyte, and μ is an actually measured viscosity of the electrolyte. In this application, ε' is either identical to or slightly different from ε; σ' is consistent or not much different from σ; mu' is identical or not very different from mu. In one embodiment, a difference between ε' and ε is less than or equal to 1.4 in absolute terms. In another embodiment, σ 'differs from σ by a small amount, meaning that the absolute value of the difference between σ' and σ is less than or equal to 0.13. In another embodiment, a difference between μ' and μ is greater than or equal to 0.16.
In the embodiment of the present application, the solvent may be mixed with the lithium salt in an inert gas atmosphere having a moisture content of 1ppm or less to obtain an electrolytic solution.
The present application also provides an electrochemical device comprising the electrolyte solution of any of the above embodiments. The electrolyte provided by the application can have high conductivity, so that the electrical property of an electrochemical device can be improved, and the product competitiveness can be improved. In the present application, the electrochemical device may be, but is not limited to, a battery, an electrolytic cell, etc., for example, may be, but is not limited to, a lithium ion battery, etc.
In an embodiment of the present application, an electrochemical device includes a positive electrode and a negative electrode. In an embodiment of the present application, the positive electrode includes a positive electrode current collector and a positive electrode active material layer disposed on a surface of the positive electrode current collector. In one embodiment, the positive active material layer includes a positive active material, a binder, and a conductive agent. Specifically, the positive active material may include at least one of lithium cobaltate, a lithium nickel manganese cobalt material, lithium iron phosphate, lithium manganese iron phosphate, and lithium manganese. In one embodiment of the present application, the negative electrode includes a negative electrode current collector and a negative electrode active material layer disposed on a surface of the negative electrode current collector. In one embodiment, the negative electrode active material layer includes a negative electrode active material, a binder, and a conductive agent. Specifically, the negative electrode active material may include at least one of lithium metal or lithium metal alloy compound, carbon material, and silicon material.
In an embodiment of the present application, the electrochemical device further includes a separator disposed between the positive electrode and the negative electrode. The type of the diaphragm of the lithium battery is not particularly limited, and the diaphragm can be selected according to actual requirements. Specifically, the material of the diaphragm may include at least one of polyethylene, polypropylene, polyvinylidene fluoride, and polymethyl methacrylate.
The effect of the technical solution of the present application is further illustrated by the following specific examples, wherein in the examples, the conductivity is measured by a conductivity meter, the viscosity is measured by an ubbelohde viscometer, and the environmental conditions of the measurement are that the temperature is 25 ± 1 ℃ and the humidity is less than or equal to 2%.
Example 1
Lithium hexafluorophosphate, ethylene carbonate, dimethyl carbonate and vinylene carbonate were mixed to obtain an electrolyte (lithium salt concentration)1mol/L, the vinylene carbonate mass content is 7 percent), and the electrolyte meets the condition that epsilon = k σ ·σ-k μ ·μ-k γ ·γ+k ε Epsilon is the dielectric constant of the solvent, sigma is the conductivity of the electrolyte, mu is the viscosity of the electrolyte, and gamma is the mass ratio of the annular organic solvent to the chain organic solvent; the dielectric constant of the solvent was 34.01 (. Epsilon.is 34.01), the mass ratio of EC to DMC was 1 (γ is 1), the conductivity of the electrolyte was 13.1ms/cm (σ is 13.1), the viscosity of the electrolyte was 2.05 mPas (. Mu.is 2.05), and k was σ Is 7.64,k μ Is 35.5,k γ Is 93,k ε It was 99.7.
Example 2
Lithium hexafluorophosphate, ethylene carbonate, dimethyl carbonate and fluoroethylene carbonate were mixed to obtain an electrolyte (lithium salt concentration 1mol/L, vinylene carbonate content 5% by mass) satisfying epsilon = k σ ·σ-k μ ·μ-k γ ·γ+k ε Epsilon is the dielectric constant of the solvent, sigma is the conductivity of the electrolyte, mu is the viscosity of the electrolyte, and gamma is the mass ratio of the annular organic solvent to the chain organic solvent; the dielectric constant of the solvent was 33.97 (ε was 33.97), the mass ratio of EC and DMC was 1 (γ was 1), the conductivity of the electrolyte was 13.15ms/cm (σ was 13.15), the viscosity of the electrolyte was 2.07 mPas (. Mu.m was 2.07), and k was σ Is 7.67,k μ Is 35.55,k γ Is 93,k ε It was 99.7.
Example 3
Mixing lithium hexafluorophosphate, lithium difluorosulfonimide, ethylene carbonate, dimethyl carbonate and vinylene carbonate to obtain an electrolyte (the concentration of lithium salt is 1mol/L, the molar ratio of the lithium hexafluorophosphate to the lithium difluorosulfonimide is 9, the mass content of the vinylene carbonate is 7%), wherein the electrolyte satisfies epsilon = k σ ·σ-k μ ·μ-k γ ·γ+k ε Epsilon is the dielectric constant of the solvent, sigma is the conductivity of the electrolyte, mu is the viscosity of the electrolyte, and gamma is the mass ratio of the annular organic solvent to the chain organic solvent; the dielectric constant of the solvent was 36.03 (. Epsilon. Is 36.03), the mass ratio of EC and DMC was 1 (. Gamma. Is 1), the conductivity of the electrolyte was 13.41ms/cm (. Sigma. Is 13.41), the viscosity of the electrolyte was 2.12 mPas (. Mu. Is 2.12), and k was σ Is 7.82,k μ Is 35.63,k γ Is 93,k ε It was 99.7.
Example 4
Lithium hexafluorophosphate, ethylene carbonate, dimethyl carbonate and ethylene sulfate were mixed to obtain an electrolyte (lithium salt concentration of 1mol/L, vinylene carbonate content by mass of 7%) satisfying e = k σ ·σ-k μ ·μ-k γ ·γ+k ε Epsilon is the dielectric constant of the solvent, sigma is the conductivity of the electrolyte, mu is the viscosity of the electrolyte, and gamma is the mass ratio of the annular organic solvent to the chain organic solvent; the dielectric constant of the solvent was 13.98 (. Epsilon.is 13.98), the mass ratio of EC to DMC was 0.25 (. Gamma.is 0.25), the conductivity of the electrolyte was 9.1ms/cm (. Sigma.is 9.1), the viscosity of the electrolyte was 3.1 mPas (. Mu.is 3.1), k. σ Is 7.34,k μ Was 35.73,k γ Is 107,k ε Was 84.7.
Example 5
Mixing lithium hexafluorophosphate, ethylene carbonate, dimethyl carbonate and methylene methanedisulfonate to obtain an electrolyte (the concentration of lithium salt is 1mol/L, the mass content of vinylene carbonate is 5%), wherein the electrolyte satisfies epsilon = k σ ·σ-k μ ·μ-k γ ·γ+k ε Epsilon is the dielectric constant of the solvent, sigma is the conductivity of the electrolyte, mu is the viscosity of the electrolyte, and gamma is the mass ratio of the annular organic solvent to the chain organic solvent; the dielectric constant of the solvent was 13.03 (. Epsilon. Is 13.03), the mass ratio of EC and DMC was 0.25 (. Gamma. Is 0.25), the conductivity of the electrolyte was 9.16ms/cm (. Sigma. Is 9.16), the viscosity of the electrolyte was 3.15 mPas (. Mu.3.15), k σ Is 7.39,k μ Was 35.75,k γ Is 107,k ε Was 84.7.
Example 6
Lithium hexafluorophosphate, ethylene carbonate, dimethyl carbonate and vinylene carbonate were mixed to obtain an electrolyte (lithium salt concentration 1mol/L, vinylene carbonate content 7% by mass), which satisfied epsilon = k σ ·σ-k μ ·μ-k γ ·γ+k ε ε is the dielectric constant of the solvent, σ is the conductivity of the electrolyte, μ is the viscosity of the electrolyte, and γ is the cyclic organic solventAnd a chain-like organic solvent; the dielectric constant of the solvent was 29.36 (. Epsilon.is 29.36), the mass ratio of EC to DMC was 3 (γ is 0.43), the conductivity of the electrolyte was 11.52ms/cm (σ is 11.52), the viscosity of the electrolyte was 2.5 mPas (. Mu.is 2.5), and k was σ Is 7.45,k μ Is 36.53,k γ Is 108,k ε It was 81.3.
Example 7
Mixing lithium hexafluorophosphate, lithium difluorosulfonimide, ethylene carbonate, dimethyl carbonate and vinylene carbonate to obtain an electrolyte (the concentration of lithium salt is 0.9mol/L, the molar ratio of the lithium hexafluorophosphate to the lithium difluorosulfonimide is 9, the mass content of the vinylene carbonate is 5%), wherein the electrolyte satisfies epsilon = k σ ·σ-k μ ·μ-k γ ·γ+k ε Epsilon is the dielectric constant of the solvent, sigma is the conductivity of the electrolyte, mu is the viscosity of the electrolyte, and gamma is the mass ratio of the annular organic solvent to the chain organic solvent; the dielectric constant of the solvent was 28.86 (ε was 28.86), the mass ratio of EC and DMC was 3 (γ was 0.43), the conductivity of the electrolyte was 11.56ms/cm (σ was 11.56), the viscosity of the electrolyte was 2.52 mPas (μ was 2.52), k was σ Is 7.47,k μ Is 36.65,k γ Is 108,k ε It was 81.3.
Performance detection
Uniformly mixing a positive active material lithium iron phosphate, a conductive agent Super P and a binder polyvinylidene fluoride (PVDF) in N-methylpyrrolidone (NMP) to prepare positive slurry, wherein the solid content of the positive slurry is 58-67%, and the viscosity range is 5000mPa & s-27000mPa & s. After being dried, the slurry comprises 97wt% of positive electrode active material, 0.5wt% of conductive agent and 2.5wt% of binder. And coating the positive electrode slurry on the surface of an aluminum foil with the thickness of 13 mu m, transferring the aluminum foil to an oven for drying, and then performing cold pressing and slitting to obtain the positive electrode piece. Wherein the positive electrode active material layer has a porosity of 32.89% and a compacted density of 2.4g/cm 3 The weight of the double-sided coating is 0.033g/cm 2 The thickness was 150.5. Mu.m.
Uniformly mixing a negative active material graphite, a conductive agent Super P, a thickening agent sodium carboxymethyl cellulose (CMC), a bonding agent and Styrene Butadiene Rubber (SBR) in deionized water to prepare negative slurryThe solid content of the polar slurry is 49-58%, and the viscosity range is 2000-8000 mPa. The dried slurry comprises 97wt% of negative active material, 0.5wt% of conductive agent, 0.5wt% of thickening agent, 1wt% of binder and 1wt% of styrene butadiene rubber. And coating the negative electrode slurry on the surface of a copper foil with the thickness of 6 mu m, transferring the copper foil to an oven for drying, and then performing cold pressing and slitting to obtain a negative electrode plate. Wherein the negative electrode active material layer had a porosity of 32.28% and a compacted density of 1.55g/cm 3 The weight of the double-sided coating is 0.016g/cm 2 The thickness was 106.2. Mu.m.
Respectively assembling the positive pole piece, the negative pole piece and a separation film (a polypropylene film with the thickness of 16 mu m) with the electrolyte prepared in the embodiments 1, 4, 6 and 7, wherein the separation film is positioned between the positive pole piece and the negative pole piece to play a role of separation, and then winding to obtain a bare cell; and placing the bare cell in an outer packaging shell, drying, injecting electrolyte, and carrying out vacuum packaging, standing, formation and shaping to obtain the lithium ion battery. The charge and discharge test was performed in a 25 ℃ incubator, in which after charging to 3.65V at a constant current of 1C, charging to 0.05C at a constant voltage of 3.65V, standing for half an hour, then discharging to 2.5V at a constant current of 1C, and after standing for half an hour, the charge cycle was restarted, with the results shown in fig. 1. The electrolyte provided by the embodiment of the application has high conductivity, the viscosity of the electrolyte is proper, and the battery prepared from the electrolyte has good cycle performance and is beneficial to use of the battery; the performance of the batteries prepared from the electrolytes of examples 1, 6 and 4 can be seen, the capacity fading trend in the circulation process is consistent with the dielectric constant rule, the higher the dielectric constant is, the higher the conductivity of the electrolyte is, the better the dynamics of lithium ions is, and the better the circulation performance is; and when the viscosity of the electrolyte is higher, the wetting performance of the electrolyte on the pole piece is poorer, the initial capacity of the fresh battery cell is activated less, and the increment of the initial capacity retention rate is lower (the first-circle discharge capacity is 100%); although the dielectric constant of example 7 is not much different from that of example 6, the electrolyte obtained has low conductivity due to the low lithium salt concentration, and when the lithium content is sufficient in the former period, the performance of the battery composed of example 7 with the low lithium salt content is not greatly different, but when the battery core is cycled to 1900 cycles, the dead lithium content is too high, the conductivity of the electrolyte is sharply reduced, and the cycling capacity of the battery core is attenuated.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (11)

1. An electrolytic solution, characterized in that the electrolytic solution comprises a lithium salt and a solvent, the solvent comprising a cyclic organic solvent and a chain organic solvent, wherein e = k σ ·σ-k μ ·μ-k γ ·γ+k ε Wherein ε is a dielectric constant of the solvent, σ is a conductivity of the electrolyte, μ is a viscosity of the electrolyte, γ is a mass ratio of the cyclic organic solvent to the chain organic solvent, and k is σ Is 7.14 to 8.74, the k is μ Is 30.15 to 36.85, the k is γ Is 56 to 112, the k is ε Is 79.7-99.8.
2. The electrolyte of claim 1 wherein γ is from 0.05 to 20.
3. The electrolyte of claim 2 wherein γ is from 0.05 to 1.
4. The electrolyte of claim 1 wherein epsilon ranges from 5 to 50.
5. The electrolyte of claim 1, wherein σ is greater than 10; mu is 1.9-2.4.
6. The electrolyte of claim 1, wherein the cyclic organic solvent comprises at least one of ethylene carbonate, propylene carbonate, dioxolane, and sulfolane;
the chain organic solvent comprises at least one of dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, ethyl acetate, methyl acetate, propyl propionate, ethyl butyrate, ethyl propionate, 1, 2-dimethoxyethane, diglyme, tetramethylsilane and adiponitrile.
7. The electrolyte of claim 1, wherein the cyclic organic solvent comprises a cyclic carbonate; the chain organic solvent includes a chain carbonate.
8. The electrolyte of claim 1, wherein the concentration of the lithium salt in the electrolyte is 0.8mol/L to 1.2mol/L;
the lithium salt comprises at least one of lithium hexafluorophosphate, lithium bistrifluoromethylsulfonyl imide, lithium bistrifluorosulfonimide, lithium tetrafluoroborate, lithium bisoxalato borate and lithium difluorooxalato borate.
9. The electrolyte of claim 1, further comprising an additive, wherein the additive is present in the electrolyte in an amount of 1% to 8% by weight;
the additive comprises at least one of vinylene carbonate, fluoroethylene carbonate, 1, 3-propane sultone, vinyl sulfate, tri (trimethylsilyl) phosphate, tri (trimethylsilyl) borate, methylene methyldesulfonate, ethylene carbonate, lithium bis (oxalato) borate, lithium difluoro (oxalato) borate and lithium difluoro (phosphorodifluoride).
10. A method for preparing an electrolyte, comprising:
according to ε' = k σ ·σ’-k μ ·μ’-k γ ·γ+k ε Obtaining the quality of the cyclic organic solvent and the chain organic solvent by the preset dielectric constant of the solvent, the preset conductivity of the electrolyte and the preset viscosity of the electrolyteA quantitative ratio, wherein epsilon ' is a preset dielectric constant of the solvent, sigma ' is a preset conductivity of the electrolyte, mu ' is a preset viscosity of the electrolyte, and gamma is a mass ratio of the cyclic organic solvent to the chain organic solvent;
mixing a cyclic organic solvent and a chain organic solvent according to the mass ratio of the cyclic organic solvent to the chain organic solvent to obtain the solvent;
mixing the solvent with a lithium salt to obtain the electrolyte, wherein epsilon = k σ ·σ-k μ ·μ-k γ ·γ+k ε The epsilon is the dielectric constant of the solvent, the sigma is the conductivity of the electrolyte, the mu is the viscosity of the electrolyte, and the k is σ Is 7.14 to 8.74, the k is μ Is 30.15 to 36.85, the k is γ Is 56 to 112, the k is ε Is 79.7-99.8.
11. An electrochemical device comprising the electrolyte according to any one of claims 1 to 9 or the electrolyte obtained by the production method according to claim 10.
CN202211233095.2A 2022-10-08 2022-10-08 Electrolyte, preparation method thereof and electrochemical device Active CN115411369B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211233095.2A CN115411369B (en) 2022-10-08 2022-10-08 Electrolyte, preparation method thereof and electrochemical device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211233095.2A CN115411369B (en) 2022-10-08 2022-10-08 Electrolyte, preparation method thereof and electrochemical device

Publications (2)

Publication Number Publication Date
CN115411369A true CN115411369A (en) 2022-11-29
CN115411369B CN115411369B (en) 2024-06-25

Family

ID=84167779

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211233095.2A Active CN115411369B (en) 2022-10-08 2022-10-08 Electrolyte, preparation method thereof and electrochemical device

Country Status (1)

Country Link
CN (1) CN115411369B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117712488A (en) * 2024-02-04 2024-03-15 深圳海辰储能科技有限公司 Electrolyte, secondary battery containing same, battery pack and electric equipment

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103985906A (en) * 2014-06-06 2014-08-13 东莞市杉杉电池材料有限公司 Lithium ion battery electrolyte with both high and low temperature performances
KR20150019259A (en) * 2013-08-13 2015-02-25 주식회사 엘지화학 Nonaqueous electrolyte and lithium secondary battery using the same
CN105140558A (en) * 2015-09-24 2015-12-09 北京万源工业有限公司 High-pressure electrolyte of lithium ion battery and preparation method thereof
CN110752408A (en) * 2019-11-01 2020-02-04 珠海冠宇电池有限公司 Electrolyte, preparation method thereof and lithium ion battery
CN112054242A (en) * 2020-08-04 2020-12-08 昆山宝创新能源科技有限公司 Electrolyte and application thereof
CN113471539A (en) * 2021-06-29 2021-10-01 惠州市赛能电池有限公司 Electrolyte, preparation method thereof and lithium ion battery
CN114204123A (en) * 2021-12-10 2022-03-18 湖南航天磁电有限责任公司 High-voltage-resistant high-power electrolyte and application thereof
CN114300750A (en) * 2021-12-27 2022-04-08 清华大学 Lithium ion battery electrolyte and lithium ion battery
WO2022134254A1 (en) * 2020-12-23 2022-06-30 惠州亿纬锂能股份有限公司 Electrolyte and preparation method therefor, and lithium ion battery
CN115133125A (en) * 2021-03-26 2022-09-30 浙江蓝天环保高科技股份有限公司 Method for improving solubility of lithium salt additive and electrolyte containing lithium salt additive

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150019259A (en) * 2013-08-13 2015-02-25 주식회사 엘지화학 Nonaqueous electrolyte and lithium secondary battery using the same
CN103985906A (en) * 2014-06-06 2014-08-13 东莞市杉杉电池材料有限公司 Lithium ion battery electrolyte with both high and low temperature performances
CN105140558A (en) * 2015-09-24 2015-12-09 北京万源工业有限公司 High-pressure electrolyte of lithium ion battery and preparation method thereof
CN110752408A (en) * 2019-11-01 2020-02-04 珠海冠宇电池有限公司 Electrolyte, preparation method thereof and lithium ion battery
CN112054242A (en) * 2020-08-04 2020-12-08 昆山宝创新能源科技有限公司 Electrolyte and application thereof
WO2022134254A1 (en) * 2020-12-23 2022-06-30 惠州亿纬锂能股份有限公司 Electrolyte and preparation method therefor, and lithium ion battery
CN115133125A (en) * 2021-03-26 2022-09-30 浙江蓝天环保高科技股份有限公司 Method for improving solubility of lithium salt additive and electrolyte containing lithium salt additive
CN113471539A (en) * 2021-06-29 2021-10-01 惠州市赛能电池有限公司 Electrolyte, preparation method thereof and lithium ion battery
CN114204123A (en) * 2021-12-10 2022-03-18 湖南航天磁电有限责任公司 High-voltage-resistant high-power electrolyte and application thereof
CN114300750A (en) * 2021-12-27 2022-04-08 清华大学 Lithium ion battery electrolyte and lithium ion battery

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
秦凯;孙新华;杨良君;刘雨辰;郑钧元;: "高比能磷酸铁锂电池电解液浸润性能改善研究", 电源技术, no. 08, 20 August 2020 (2020-08-20) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117712488A (en) * 2024-02-04 2024-03-15 深圳海辰储能科技有限公司 Electrolyte, secondary battery containing same, battery pack and electric equipment
CN117712488B (en) * 2024-02-04 2024-05-24 深圳海辰储能科技有限公司 Electrolyte, secondary battery containing same, battery pack and electric equipment

Also Published As

Publication number Publication date
CN115411369B (en) 2024-06-25

Similar Documents

Publication Publication Date Title
CN111628218B (en) Lithium ion battery and preparation method thereof
CN109728340B (en) Lithium ion battery
CN114122491A (en) Lithium ion battery
CN105633466B (en) Nonaqueous electrolytic solution and lithium ion battery comprising it
CN109473719B (en) Lithium ion battery electrolyte and lithium ion battery containing same
CN111525190B (en) Electrolyte and lithium ion battery
CN105914402B (en) A kind of nonaqueous electrolytic solution and lithium ion battery
CN109935908B (en) Low-concentration lithium salt electrolyte and lithium secondary battery comprising same
CN111416145A (en) Lithium ion battery
CN110994030B (en) Lithium battery electrolyte and lithium ion battery
JP7106746B2 (en) lithium ion secondary battery
CN109004275B (en) Electrolyte solution and secondary battery
US20160036092A1 (en) Lithium-ion battery and electrolyte thereof
CN103515650A (en) Non-aqueous electrolyte for lithium ion battery, and application thereof
CN111129590A (en) High-voltage lithium ion battery non-aqueous electrolyte and high-voltage lithium ion battery
CN105098238A (en) Lithium ion secondary battery and electrolyte thereof
CN111710906A (en) High-stability lithium ion battery electrolyte and battery containing same
US20240290973A1 (en) Electrode plate, lithium-ion battery, battery module, battery pack and electric device
WO2020135584A1 (en) Positive electrode film formation additive for battery electrolyte, and electrolyte and lithium battery using additive
CN115411369B (en) Electrolyte, preparation method thereof and electrochemical device
CN112290090A (en) High-nickel ternary lithium ion battery non-aqueous electrolyte and battery containing electrolyte
CN109309248B (en) Electrolyte solution and secondary battery
CN111900474A (en) Electrolyte for natural graphite cathode lithium ion battery
CN116093430B (en) High-voltage nonaqueous electrolyte and lithium ion secondary battery
CN116154299A (en) Battery, battery pack and electric equipment

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
GR01 Patent grant
GR01 Patent grant