CN115692837A - Low-temperature electrolyte for cylindrical battery, preparation method and lithium battery - Google Patents
Low-temperature electrolyte for cylindrical battery, preparation method and lithium battery Download PDFInfo
- Publication number
- CN115692837A CN115692837A CN202211430941.XA CN202211430941A CN115692837A CN 115692837 A CN115692837 A CN 115692837A CN 202211430941 A CN202211430941 A CN 202211430941A CN 115692837 A CN115692837 A CN 115692837A
- Authority
- CN
- China
- Prior art keywords
- low
- electrolyte
- temperature
- battery
- carbonate
- 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
Images
Classifications
-
- 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
- Primary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a low-temperature electrolyte for a cylindrical battery, which comprises a lithium salt and an electrolyte solvent, wherein the electrolyte solvent comprises an organic solvent and an additive, the concentration of the lithium salt is 0.8-1.3 mol/L, the weight percentage of the organic solvent in the electrolyte solvent is 80-98%, and the weight percentage of the additive in the electrolyte solvent is 2-20%. The low-temperature electrolyte for the cylindrical battery has lower conductivity under the low-temperature environment condition, good low-temperature charge and discharge performance and good circulation stability; the stable SEI film with high dielectric constant can be formed on the surface of the electrode of the battery, so that the viscosity of the electrolyte is reduced, and the battery has good performance in a low-temperature environment; and the gram capacity of the battery anode material can be improved, and the circulating stability is improved.
Description
Technical Field
The invention belongs to the technical field of electrochemical energy storage, and relates to a low-temperature electrolyte for a cylindrical battery, a preparation method and a lithium battery, in particular to a low-temperature electrolyte for a ternary high-rate battery, a preparation method and a lithium battery.
Background
The lithium ion battery has the advantages of wide working temperature range, large specific energy density, long cycle life, small self-discharge, no memory effect, environmental friendliness and the like, and is widely applied to various electronic devices, such as mobile phones, notebook computers, electric tools and other fields. Currently, as the performance requirements of power batteries under low-temperature environmental conditions are higher and higher, the development of low-temperature batteries is of great significance.
The electrolyte is an important component of a lithium ion battery and is generally composed of a lithium salt, a solvent and additives. Solvents with higher dielectric constants favor the dissolution of lithium salts, while lower viscosities favor Li + To be transmitted. However, up to now, it has not been found that any one solvent can satisfy both of the above conditions.
The viscosity of the electrolyte increases under a low-temperature environment, the fluidity of the electrolyte is poor, and the performance of the electrolyte is seriously influenced, so that the low-temperature performance of the battery is poor.
Disclosure of Invention
The invention provides a low-temperature electrolyte for a cylindrical battery, a preparation method and a lithium battery, aiming at the problems in the prior art, the electrolyte can improve the conductivity of the battery under the low-temperature environment condition, and can form a stable SEI film with low impedance on the surfaces of the electrolyte and a negative electrode, so that the performance of the battery is improved, for example, the discharge capacity of the cylindrical battery under the low-temperature environment can be effectively improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a low-temperature electrolyte for a cylindrical battery comprises a lithium salt and an electrolyte solvent, wherein the electrolyte solvent comprises an organic solvent and an additive, the concentration of the lithium salt is 0.8-1.3 mol/L, the weight percentage of the organic solvent in the electrolyte solvent is 80-98% (such as 82%, 85%, 90%, 92%, 94%, 96%, 97%), and the weight percentage of the additive in the electrolyte solvent is 2-20% (such as 3%, 4%, 5%, 6%, 8%, 10%, 12%, 15%, 18%, 19%).
As a preferable embodiment, the low-temperature electrolytic solution includes one or more of ethylene carbonate (melting point: 35-38 ℃), propylene carbonate (melting point: 49 ℃), butylene carbonate (melting point: 53 ℃), dimethyl carbonate (2-4 ℃), ethyl methyl carbonate (melting point: 14 ℃), diethyl carbonate (melting point: 43 ℃), methyl propionate (melting point: 87.5 ℃), butyl propionate (melting point: 89.5 ℃) and ethyl butyrate (melting point: 93.3 ℃).
The invention selects carbonic ester as organic solvent, which is beneficial to improving the low-temperature conductivity of the electrolyte.
In a preferred embodiment, the volume of the low-melting-point solvent in the organic solvent is more than 70% (e.g., 72%, 75%, 78%, 80%) of the total volume of the organic solvent; the low melting point solvent has a melting point of less than-10 ℃.
The invention adopts the low-melting-point solvent and ensures that the volume of the low-melting-point solvent is more than 70 percent of the total volume of the solvent, thereby being beneficial to realizing the performance of the cylindrical battery at low temperature.
Preferably, the organic solvent includes propylene carbonate, ethyl methyl carbonate, diethyl carbonate and ethyl butyrate, and more preferably, 40-50% (such as 42%, 45%, 48%) of propylene carbonate, 40-45% (such as 41%, 42%, 43%, 44%) of ethyl methyl carbonate, 2-10% (such as 3%, 5%, 8%, 9%) of diethyl carbonate, 5-10% (such as 6%, 7%, 8%, 9%) of ethyl butyrate are present in the organic solvent by volume percentage.
The low-temperature electrolyte comprises one or more of diphenyl carbonate, hydroxycarboxylic acid, diphenol diaryl ether, fluoroethylene carbonate, fluoropropylene carbonate, chloropropylene carbonate, ethylene sulfite and vinylene carbonate as a preferred embodiment; preferably, the additive comprises propylene fluorocarbonate and propylene chlorocarbonate, and more preferably, the volume ratio of the propylene fluorocarbonate to the propylene chlorocarbonate is 1.
In the electrolyte, the addition of the additive can improve the conductivity and stability of the SEI film, thereby improving the low-temperature performance of the lithium ion battery. Therefore, the selection and optimization of the additives in the electrolyte are also important links for improving the low-temperature battery.
The low-temperature electrolyte can be normally used within the range of minus 10 ℃ to minus 20 ℃ and can normally exert the performance.
According to the invention, a specific low-temperature additive is added into the electrolyte, so that the interface impedance of the battery at low temperature is effectively reduced, and the performance of the lithium battery at low temperature is effectively improved. The method has a positive effect on solving the problem of low lithium salt conductivity under a low temperature condition.
In the invention, the additive is added into the electrolyte to improve the conductivity and stability of the electrolyte under low temperature conditions, thereby improving the low temperature performance of the cylindrical battery. After the additive is added, the conductivity and stability of the interface of the electrode-electrolyte are improved, so that the diffusion capacity of lithium ions in an active substance (positive active material) under a low-temperature condition is improved, and the low-temperature performance of the battery is improved.
The principle of the additive in reducing the interfacial resistance of the battery at low temperatures is as follows: under the low-temperature condition, the additive forms a thin and compact SEI film on the interface of the electrode and the electrolyte, so that the ionic conductivity of the electrolyte under the low-temperature condition is improved, and the interface impedance of the battery under the low-temperature condition is reduced.
In the invention, the dosage of the additive has influence on the low-temperature electrolyte, and the larger the dosage of the additive is, the more film-forming components are, the larger the internal resistance is, the internal resistance is increased, the polarization of the battery is increased, and the low-temperature performance of the electrolyte is deteriorated, or the more the additive accelerates the dissolution of an SEI film, so that the cycle performance of the battery is reduced.
The above low-temperature electrolyte, as a preferred embodiment, the lithium salt includesLithium hexafluorophosphate (LiPF) 6 ) Lithium tetrafluoroborate (LiBF) 4 ) Lithium hexafluoroarsenate (LiAsF) 6 ) Lithium perchlorate (LiClO) 4 ) And lithium trifluoromethanesulfonate (LiCF) 3 SO 3 ) Preferably, the lithium salt is LiPF 6 。
As a preferred embodiment, the low-temperature electrolyte is a low-temperature electrolyte for a ternary high-rate battery, and preferably, the ternary high-rate battery comprises a nickel-cobalt-manganese battery.
The invention also provides a preparation method of the low-temperature electrolyte for the cylindrical battery, which comprises the following steps:
step 1, preparing an organic solvent of the low-temperature electrolyte according to a required proportion;
and 2, sequentially adding additives and lithium salt into the organic solvent in the step 1 according to the proportion, mixing, and standing the solution for 20-28 hours after the lithium salt is fully dissolved to obtain the low-temperature electrolyte for the cylindrical battery.
In the above preparation method, as a preferred embodiment, the preparation of the low-temperature electrolyte is performed in an argon-filled glove box, and the content of moisture and oxygen in the glove box is below 1ppm so as to reduce the influence of moisture and oxygen on the electrolyte.
In the above preparation method, as a preferred embodiment, the electrolyte system is uniformly mixed by stirring or ultrasonic means to obtain the low-temperature electrolyte for the cylindrical battery.
The invention also provides a lithium ion battery, which comprises a positive pole piece, a diaphragm, a negative pole piece, electrolyte, an external terminal and a shell; the electrolyte adopts the low-temperature electrolyte for the cylindrical battery or the low-temperature electrolyte for the cylindrical battery prepared by the preparation method.
In the above lithium ion battery, preferably, the positive electrode material used in the positive electrode plate is a lithium-nickel-cobalt-manganese compound having a layered structure; the diaphragm is a double-sided coating diaphragm;
preferably, the positive electrode current collector used in the positive electrode piece is an aluminum foil, and the thickness of the positive electrode current collector is 10-20 μm;
preferably, the negative current collector used in the negative pole piece is a copper foil, and the thickness of the copper foil is 8-15 μm;
preferably, the binder in the negative electrode plate is a sodium carboxymethylcellulose (CMC) and polyacrylic acid (PAA) aqueous binder;
preferably, the diaphragm is a coating diaphragm, and the adopted base film comprises any one of PP, PE, PP-PE-PP and PET; the thickness range of the base film is 10-30 mu m; the porosity is 40-60%.
Besides being normally used at room temperature, the lithium ion battery is particularly suitable for being used at low temperature, can still be normally used at the temperature of-10 ℃ to-20 ℃ and normally exerts the performance.
The low-temperature electrolyte has excellent performance on the cylindrical battery under the condition of low-temperature high-rate discharge, and has obvious improvement on the discharge platform of the battery under the condition of low temperature and the exertion of the discharge capacity of the battery.
According to the invention, a specific low-temperature additive is added into the electrolyte, so that the interface impedance of the battery at low temperature is effectively reduced, and the performance of the lithium battery at low temperature is effectively improved. The method has a positive effect on solving the problem of low lithium salt conductivity under a low temperature condition. Therefore, the lithium salt electrolyte under the low-temperature condition has very important practical significance for widening the application range of the lithium ion battery and improving the application value of the lithium ion battery under the low-temperature condition.
In the invention, the technical characteristics can be freely combined to form a new technical scheme under the condition of not conflicting with each other.
Compared with the prior art, the invention has the following beneficial effects:
(1) The low-temperature electrolyte for the cylindrical battery has lower conductivity under the low-temperature environment condition, good low-temperature charge and discharge performance and good circulation stability;
(2) Lithium salt, organic solvent and additive materials of all components selected by the low-temperature electrolyte of the cylindrical battery are simple and easy to obtain, the low-temperature electrolyte has low price, and the preparation process of the low-temperature electrolyte is simple;
(3) The low-temperature electrolyte of the cylindrical battery can ensure effective dissolution of lithium salt;
(4) The low-temperature electrolyte of the cylindrical battery can form a stable SEI film with a high dielectric constant on the surface of the electrode of the battery, reduce the viscosity of the electrolyte and ensure that the battery has good performance in a low-temperature environment;
(5) The low-temperature electrolyte for the cylindrical battery can improve gram capacity of the battery anode material and improve cycle stability.
Drawings
Fig. 1 is direct current internal resistance (DCR) of the cylindrical batteries of example 1 and comparative example 1 at different states of charge (SOC) at a temperature of 25 ℃.
Fig. 2 is a discharge rate graph of a battery assembled using the electrolyte of example 1, the discharge rate being 0.5C and the discharge temperature being 25 ℃.
Fig. 3 is a SEI film resistance diagram of batteries assembled using the electrolyte solutions in examples 1 to 3 of the present invention.
Detailed Description
The present invention will be described in detail below with reference to examples thereof. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation. Indeed, it will be appreciated by those skilled in the art that various modifications and/or changes in form may be made to the present invention without departing from the scope or spirit of the invention.
In the invention, all parts and percentages are weight units, and all equipment and raw materials can be purchased from the market or commonly used in the industry. In the present invention, the capacity retention rates in each of the examples and comparative examples in the present invention are average values of 3 measurements, unless otherwise specified.
Example 1
The low-temperature electrolyte of the cylindrical battery comprises a lithium salt and an electrolyte solvent, wherein the electrolyte solvent comprises an organic solvent and an additive, and the lithium salt is LiPF 6 The concentration is 1.1mol/L; the additive accounts for 5wt% of the electrolyte solvent, and the organic solvent accounts for 95% of the electrolyte solvent; the content of the organic solvent is 40 percent of propylene carbonate, 40 percent of methyl ethyl carbonate, 10 percent of diethyl carbonate and 10 percent of ethyl butyrate according to the volume ratio based on the total volume of the organic solvent; in the additive, the fluoropropylene carbonate accounts for 3wt% of the electrolyte solvent, and the chloropropylene carbonate accounts for 2wt% of the electrolyte solvent. The preparation method of the low-temperature electrolyte comprises the following steps:
in a glove box filled with argon, propylene carbonate, ethyl methyl carbonate, diethyl carbonate and ethyl butyrate were mixed in a volume ratio of 40 6 Dissolving in the organic solvent, adding propylene carbonate fluoride and propylene carbonate chloride, stirring uniformly, and preparing into LiPF 6 The concentration is 1.1mol/L, and the weight percentage of the additive is 5wt% of the electrolyte solvent.
The electrolyte and a ternary NCM811 anode material are used as anode active materials, graphite is used as an active material of a cathode, and a diaphragm (a single-sided ceramic aluminum oxide diaphragm) is manufactured into a cylindrical 18650 battery for electrochemical performance test, wherein the voltage of the battery is 4.2-2.75V. Table 1 shows the low temperature characteristics of the cylindrical lithium battery of the present embodiment at different temperatures. Fig. 1 shows direct current internal resistances (DCR) of the battery of example 1 at different states of charge (SOC). FIG. 2 is a battery rate discharge diagram of the electrolyte of example 1, the discharge rate being 0.5C and the discharge temperature being 25 ℃. Fig. 3 shows a battery SEI film resistance diagram of the electrolyte of example 1; the semicircle of the high frequency part represents the change of the charge transfer impedance of the sample, and the slope of the low frequency part represents the change of the lithium ion diffusion impedance of the sample.
Table 1 low temperature characteristics of cylindrical lithium battery in example 1 at different temperatures
In this embodiment, the performance of ethyl butyrate to an organic solvent, and even the low-temperature cycle performance of an electrolyte, is improved.
In the embodiment, a mixed solvent comprising propylene carbonate, ethyl methyl carbonate, diethyl carbonate and ethyl butyrate is used as an organic solvent in the electrolyte, so that a more stable SEI (solid electrolyte interphase) film can be formed on the surface of a negative electrode, the viscosity of the electrolyte can be reduced, and Li is improved + The migration speed of (2). The fluorinated propylene carbonate and the chlorinated propylene carbonate are used as additives, and the addition of the additives can improve the conductivity and stability of the electrolyte on the SEI film on the surface of the negative electrode, so that the low-temperature performance of the lithium ion battery is improved. Therefore, the selection and optimization of the additive are also important links for improving the low-temperature electrolyte and even the low-temperature battery.
Example 2
The low-temperature electrolyte of the cylindrical battery comprises a lithium salt and an electrolyte solvent, wherein the electrolyte solvent comprises an organic solvent and an additive, and the lithium salt is LiPF 6 The concentration is 1.0mol/L; the additive accounts for 5wt% of the electrolyte solvent, and the organic solvent accounts for 95% of the electrolyte solvent; the organic solvent comprises propylene carbonate, ethyl methyl carbonate, diethyl carbonate and ethyl butyrate, and in the additive, the fluoropropylene carbonate accounts for 3wt% of the electrolyte solvent and the chloropropylene carbonate accounts for 2wt% of the electrolyte solvent. The preparation method of the low-temperature electrolyte comprises the following steps:
in a glove box filled with argon, propylene carbonate, ethyl methyl carbonate, diethyl carbonate and ethyl butyrate were mixed in a volume ratio of 50 6 Dissolving in the solvent, adding propylene carbonate fluoride and propylene carbonate chloride, stirring uniformly, and preparing into LiPF 6 The concentration is 1.0mol/L, and the weight percentage content of the additive is 5 percent of the electrolyte solvent.
The resulting electrolyte was used in a cylindrical lithium battery, and the battery assembly method was as described in example 1. Table 2 lists the low-temperature characteristics at different temperatures, i.e., the capacity retention rates at different temperatures and different discharge rates, of the cylindrical lithium battery in example 2. Fig. 3 shows a battery SEI film resistance diagram of the electrolyte of the present embodiment.
Table 2 low temperature characteristics of cylindrical lithium battery in example 2 at different temperatures
Example 3
The low-temperature electrolyte of the cylindrical battery comprises a lithium salt and an electrolyte solvent, wherein the electrolyte solvent comprises an organic solvent and an additive, and the lithium salt is LiPF 6 The concentration is 1.3mol/L; the additive accounts for 5wt% of the electrolyte solvent, and the organic solvent accounts for 95wt% of the electrolyte solvent; the organic solvent comprises propylene carbonate, ethyl methyl carbonate, diethyl carbonate and ethyl butyrate, and in the additive, the fluoropropylene carbonate accounts for 3wt% of the electrolyte solvent, and the chloropropylene carbonate accounts for 2wt% of the electrolyte solvent. The preparation method of the low-temperature electrolyte comprises the following steps:
mixing propylene carbonate, ethyl methyl carbonate, diethyl carbonate and ethyl butyrate according to a volume ratio of 50 6 Dissolving in the organic solvent, adding fluoropropylene carbonate and chloropropylene carbonate, stirring uniformly, and preparing into LiPF 6 The concentration is 1.3mol/L, and the weight percentage content of the additive is 5 percent of the electrolyte solvent.
Table 3 low temperature characteristics of cylindrical lithium battery in example 3 at different temperatures
The resulting electrolyte was used in a cylindrical lithium battery, and the battery assembly method was as described in example 1. Table 3 lists the low temperature characteristics at different temperatures, i.e., the capacity retention rates at different temperatures and different discharge rates, of the cylindrical lithium battery in example 3. Fig. 3 shows a battery SEI film resistance plot for the electrolyte of example 3.
Comparative example 1
This comparative example differs from example 1 in that no additives are included and the rest is the same. The method comprises the following specific steps:
the low-temperature electrolyte for the cylindrical battery comprises 1.1mol/L lithium salt and an organic solvent, wherein the lithium salt is LiPF 6 The organic solvent comprises 40% of propylene carbonate, 40% of ethyl methyl carbonate, 10% of diethyl carbonate and 10% of ethyl butyrate by volume ratio.
The resulting electrolyte was used in a cylindrical lithium battery, and the battery assembly method was as described in example 1. Fig. 1 shows the direct current internal resistance (DCR) of the battery of comparative example 1 at different states of charge (SOC). Table 4 shows low temperature characteristics at different temperatures of the cylindrical lithium battery of comparative example 1.
Table 4 low temperature characteristics of the cylindrical lithium battery of comparative example 1 at different temperatures
| Temperature (. Degree.C.) | Discharge rate (C) | Capacity retention (%) |
| 25 | 1 | 98.16 |
| 10 | 1 | 93.47 |
| -20 | 1 | 82.61 |
| -40 | 1 | 71.8 |
As can be seen from fig. 1, the low-temperature electrolyte to which the additive was added in example 1 had a smaller direct current internal resistance at different states of charge (SOC) at a temperature of 25 ℃. As can be seen from tables 1 and 4, the cylindrical battery assembled with the low-temperature electrolyte containing the additive in example 1 has a high capacity retention ratio and a good low-temperature performance at a low temperature at the same discharge rate as the low-temperature electrolyte containing no additive.
Comparative example 2
The comparative example differs from example 1 in that the organic solvent does not contain ethyl butyrate, as follows:
the low-temperature electrolyte of the cylindrical battery comprises 1.1mol/L lithium salt and an organic solvent, wherein the lithium salt is LiPF 6 The organic solvent comprises 50% of propylene carbonate, 40% of ethyl methyl carbonate and 10% of diethyl carbonate according to volume ratio. The resulting electrolyte was used in a cylindrical lithium battery, and the battery assembly method was as described in example 1. Table 5 shows low temperature characteristics at different temperatures of the cylindrical lithium battery of comparative example 2.
TABLE 5 Low temperature characteristics of the cylindrical lithium battery of comparative example 2 at different temperatures
As is clear from tables 1 and 5, the cylindrical battery assembled with the low-temperature electrolyte solution containing the additive in example 1 has a high capacity retention ratio and a good low-temperature performance at a low temperature at the same discharge rate as compared with the low-temperature electrolyte solution containing no additive.
In summary, the additive for low-temperature electrolyte for cylindrical batteries according to the present invention increases the migration rate of lithium ions, mainly from the viewpoint of reducing the film formation resistance. In addition, the proper increase of the lithium salt concentration at low temperature can improve the conductivity of the electrolyte and improve the low-temperature performance of the battery. The fluoro propylene carbonate and the chloro propylene carbonate are suitable additives for the low-temperature electrolyte of the cylindrical battery.
Claims (10)
1. The low-temperature electrolyte for the cylindrical battery is characterized by comprising a lithium salt and an electrolyte solvent, wherein the electrolyte solvent comprises an organic solvent and an additive, the concentration of the lithium salt is 0.8-1.3 mol/L, the weight percentage of the organic solvent in the electrolyte solvent is 80-98%, and the weight percentage of the additive in the electrolyte solvent is 2-20%.
2. The low-temperature electrolyte for cylindrical batteries according to claim 1, wherein the organic solvent comprises one or more of ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, methyl propionate, butyl propionate and ethyl butyrate;
and/or the additive comprises one or more of diphenyl carbonate, hydroxycarboxylic acid, diphenol diaryl ether, fluoroethylene carbonate, fluoropropylene carbonate, chloropropylene carbonate, ethylene sulfite and vinylene carbonate.
3. The low-temperature electrolyte for cylindrical batteries according to claim 1, wherein the volume of the low-melting-point solvent in the organic solvent is 70% or more of the total volume of the organic solvent; the melting point of the low-melting-point solvent is lower than-10 ℃;
and/or the organic solvent comprises propylene carbonate, ethyl methyl carbonate, diethyl carbonate and ethyl butyrate;
and/or, the additive comprises propylene fluorocarbonate and propylene chlorocarbonate.
4. The low-temperature electrolyte for cylindrical batteries according to claim 3,
according to volume percentage, in an organic solvent, 40-50% of propylene carbonate, 40-45% of methyl ethyl carbonate, 2-10% of diethyl carbonate and 5-10% of ethyl butyrate;
in the additive, the volume ratio of the fluorinated propylene carbonate to the chlorinated propylene carbonate is 1-1.
5. The low-temperature electrolyte for cylindrical batteries according to claim 1, wherein said lithium salt is selected from one or more of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium hexafluoroarsenate, lithium perchlorate and lithium trifluoromethanesulfonate.
6. The low-temperature electrolyte for the cylindrical battery according to any one of claims 1 to 5, wherein the low-temperature electrolyte is used for a ternary high-rate battery, preferably the ternary high-rate battery comprises a nickel-cobalt-manganese battery.
7. A method for preparing a low-temperature electrolyte for cylindrical batteries according to any one of claims 1 to 6, comprising the steps of:
step 1, preparing an organic solvent of the low-temperature electrolyte according to a required proportion;
and 2, sequentially adding additives and lithium salt into the organic solvent in the step 1 according to the proportion, mixing, and standing the solution for 20-28 hours after the lithium salt is fully dissolved to obtain the low-temperature electrolyte for the cylindrical battery.
8. The method for preparing a low-temperature electrolyte for cylindrical batteries according to claim 7, wherein the preparation of the low-temperature electrolyte is carried out in an argon-filled glove box, and the contents of moisture and oxygen in the glove box are below 1 ppm;
and/or in the step 2, uniformly mixing the electrolyte system in a stirring or ultrasonic mode to obtain the low-temperature electrolyte for the cylindrical battery.
9. A lithium ion battery is characterized by comprising a positive pole piece, a diaphragm, a negative pole piece, electrolyte, an external terminal and a shell; the electrolyte adopts the low-temperature electrolyte for the cylindrical battery as defined in any one of claims 1 to 6 or the low-temperature electrolyte for the cylindrical battery prepared by the preparation method as defined in any one of claims 7 to 8.
10. The lithium ion battery of claim 9, wherein the minimum temperature for normal use of the lithium ion battery is-20 ℃;
and/or the positive electrode material used in the positive electrode plate adopts a lithium-nickel-cobalt-manganese compound with a layered structure; the diaphragm is a double-sided coating diaphragm;
and/or the positive current collector used in the positive pole piece is an aluminum foil, and the thickness of the positive current collector is 10-20 μm;
and/or the negative current collector used in the negative pole piece is a copper foil, and the thickness of the negative current collector is 8-15 μm;
and/or the binder in the negative pole piece comprises sodium carboxymethylcellulose and a polyacrylic acid water-based binder;
and/or the diaphragm is a coating diaphragm, and the adopted basal membrane comprises PP, PE, PP-PE-PP and PET; the thickness range of the base film is 10-30 mu m; the porosity is 40-60%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211430941.XA CN115692837A (en) | 2022-11-15 | 2022-11-15 | Low-temperature electrolyte for cylindrical battery, preparation method and lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211430941.XA CN115692837A (en) | 2022-11-15 | 2022-11-15 | Low-temperature electrolyte for cylindrical battery, preparation method and lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115692837A true CN115692837A (en) | 2023-02-03 |
Family
ID=85052792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211430941.XA Pending CN115692837A (en) | 2022-11-15 | 2022-11-15 | Low-temperature electrolyte for cylindrical battery, preparation method and lithium battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115692837A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101106206A (en) * | 2007-08-06 | 2008-01-16 | 上海南都能源科技有限公司 | A low temperature working lithium ion secondary battery |
| CN101557018A (en) * | 2009-05-20 | 2009-10-14 | 江西和强实业有限公司 | Low-temperature electrolytic solution of power lithium-ion battery |
| CN103500850A (en) * | 2013-10-23 | 2014-01-08 | 山东大学 | Low-temperature electrolyte of lithium iron phosphate battery |
| CN103647110A (en) * | 2013-12-06 | 2014-03-19 | 华瑞(新乡)化工有限公司 | Ultralow temperature discharge electrolyte of novel lithium ion battery |
| CN107171023A (en) * | 2017-05-17 | 2017-09-15 | 中国第汽车股份有限公司 | A kind of low temperature electrolytes for Li-ion batteries |
| CN112349957A (en) * | 2019-08-06 | 2021-02-09 | 珠海冠宇电池股份有限公司 | Electrolyte, preparation method thereof and lithium ion battery |
| CN112421111A (en) * | 2020-10-29 | 2021-02-26 | 电子科技大学 | Low-temperature electrolyte applied to NCM111 lithium battery |
-
2022
- 2022-11-15 CN CN202211430941.XA patent/CN115692837A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101106206A (en) * | 2007-08-06 | 2008-01-16 | 上海南都能源科技有限公司 | A low temperature working lithium ion secondary battery |
| CN101557018A (en) * | 2009-05-20 | 2009-10-14 | 江西和强实业有限公司 | Low-temperature electrolytic solution of power lithium-ion battery |
| CN103500850A (en) * | 2013-10-23 | 2014-01-08 | 山东大学 | Low-temperature electrolyte of lithium iron phosphate battery |
| CN103647110A (en) * | 2013-12-06 | 2014-03-19 | 华瑞(新乡)化工有限公司 | Ultralow temperature discharge electrolyte of novel lithium ion battery |
| CN107171023A (en) * | 2017-05-17 | 2017-09-15 | 中国第汽车股份有限公司 | A kind of low temperature electrolytes for Li-ion batteries |
| CN112349957A (en) * | 2019-08-06 | 2021-02-09 | 珠海冠宇电池股份有限公司 | Electrolyte, preparation method thereof and lithium ion battery |
| CN112421111A (en) * | 2020-10-29 | 2021-02-26 | 电子科技大学 | Low-temperature electrolyte applied to NCM111 lithium battery |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103078141A (en) | Lithium-ion secondary battery and electrolyte thereof | |
| CN105826600A (en) | Nonaqueous electrolyte solution for lithium ion batteries and lithium ion batteries | |
| CN104269576A (en) | Electrolyte and lithium ion battery adopting same | |
| CN106159330A (en) | A kind of PC base high-voltage electrolyte and a kind of lithium ion battery | |
| CN104022310A (en) | Lithium ion secondary battery electrolyte and lithium ion battery containing electrolyte | |
| CN112331917A (en) | Wide-temperature-range lithium ion battery electrolyte and preparation method and application thereof | |
| CN111313092A (en) | Lithium ion battery electrolyte capable of improving film formation of positive electrode and negative electrode | |
| CN114976255A (en) | Electrolyte, preparation method thereof and lithium ion battery | |
| CN102832409B (en) | Low temperature lithium ion battery electrolyte and its preparation method | |
| CN1306645C (en) | Lithium ion battery electrolyte containing organophosphorus compounds and battery formed thereby | |
| CN114530632A (en) | Lithium ion battery electrolyte and lithium ion battery | |
| CN114069051A (en) | Fluoro-carboxylic acid ester based low-temperature electrolyte and sodium ion battery containing same | |
| CN101656332B (en) | Lithium-ion battery electrolyte and lithium-ion battery containing same | |
| CN113381074A (en) | Low-temperature electrolyte and application thereof | |
| CN116683028A (en) | Electrolyte additive, electrolyte and lithium ion battery | |
| WO2023236509A1 (en) | Electrolyte solution and preparation method therefor, and lithium-ion battery | |
| CN115966769A (en) | Local high-concentration lithium metal battery electrolyte and preparation method and application thereof | |
| CN110890591A (en) | Lithium ion battery electrolyte with high-temperature and low-temperature performances | |
| CN115312867A (en) | High-performance low-temperature electrolyte and application thereof in lithium/sodium ion battery | |
| CN114639871A (en) | Electrolyte containing phosphite ester lithium salt additive and lithium battery | |
| CN104218257A (en) | Electrolyte of lithium ion secondary battery and the lithium ion secondary battery comprising same | |
| CN115692837A (en) | Low-temperature electrolyte for cylindrical battery, preparation method and lithium battery | |
| CN105098235A (en) | Lithium ion secondary battery and electrolyte thereof | |
| CN114583281A (en) | High-voltage-resistant ether-based electrolyte for low-temperature lithium metal battery | |
| CN114188605A (en) | Lithium ion battery electrolyte for silicon-carbon cathode and lithium ion battery containing electrolyte |
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 |