CN113851657A - Preparation method of ultralow-temperature high-rate lithium ion battery for electronic cigarette - Google Patents

Preparation method of ultralow-temperature high-rate lithium ion battery for electronic cigarette Download PDF

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CN113851657A
CN113851657A CN202111216772.5A CN202111216772A CN113851657A CN 113851657 A CN113851657 A CN 113851657A CN 202111216772 A CN202111216772 A CN 202111216772A CN 113851657 A CN113851657 A CN 113851657A
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battery
lithium ion
ion battery
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胡常青
赵明
李津
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Shandong Yincheng New Energy Technology Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G01R31/3865—Arrangements for measuring battery or accumulator variables related to manufacture, e.g. testing after manufacture
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0567—Liquid materials characterised by the additives
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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Abstract

The invention relates to the technical field of lithium battery preparation, in particular to a preparation method of an ultralow-temperature high-rate lithium ion battery for an electronic cigarette. The method comprises the steps of preparing a composite conductive agent, preparing a positive plate, preparing a negative plate, rolling and splitting the positive plate and the negative plate to obtain a positive plate and a negative plate, welding tabs, preparing a rate type electrolyte, preparing a lithium ion battery, testing the performance and the like. The design of the invention starts from improving the conductive capability of the pole piece, reducing polarization, improving the conductivity and rate capability of the electrolyte at low temperature, effectively improves the low-temperature charge-discharge performance and rate capability of the lithium battery, reduces cost, improves the stability and safety of the lithium battery, improves the difficult problems that the lithium battery can not be normally charged and discharged at high and low temperatures, and the capacity is attenuated and the like by optimizing material collocation and compounding conductive agents, changing the pole piece making mode, adopting a middle pole lug outlet mode, and using a new mode of adding ester solvents to configure the electrolyte and the like, and provides guarantee for the application of the lithium battery in high and cold areas and the military industry field.

Description

Preparation method of ultralow-temperature high-rate lithium ion battery for electronic cigarette
Technical Field
The invention relates to the technical field of lithium battery preparation, in particular to a preparation method of an ultralow-temperature high-rate lithium ion battery for an electronic cigarette.
Background
The improvement and development of materials are the premise of realizing high-rate charging of batteries, and at present, LiCoO is frequently used in commercial lithium ion batteries2As a positive electrode material. The working principle of the lithium ion battery is that potential difference occurs between the positive electrode and the negative electrode through the change of the internal electrolyte through chemical reaction, so that current is generated. The electrolyte moves quite slowly in a low-temperature (such as-40 ℃) environment, so that the transfer activity of lithium ions between the positive electrode and the negative electrode is influenced, and the charge and discharge performance of the battery is reduced.
The lithium ion battery can greatly affect the electrochemical performance of the battery when charged and discharged under the low temperature condition: firstly, the polarization of the rechargeable battery is large in a low-temperature environment, the constant current proportion of charging is low, and the charging electric quantity is small; and secondly, when the traditional lithium battery is charged at low temperature, lithium is easily separated from the surface of the negative electrode, so that the fire risk exists. In order to improve the high rate charge and low temperature performance of the battery, studies were conducted with materials as breakthrough. However, at present, there is no perfect preparation process for lithium ion batteries with improved low-temperature performance and high-rate charging.
Disclosure of Invention
The invention aims to provide a preparation method of an ultralow-temperature high-rate lithium ion battery for an electronic cigarette, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention aims to provide a preparation method of an ultralow-temperature high-rate lithium ion battery for an electronic cigarette, which comprises the following steps:
s1, adding a certain amount of superconducting carbon black into the carbon nano tube to prepare a composite conductive agent to replace the original conductive agent;
s2, stirring and mixing the lithium manganate, the composite conductive agent and the water-based binder according to a certain proportion to obtain positive electrode slurry, and coating the positive electrode slurry by a coating machine according to the double-sided surface density of 150-250 g/m3Coating the mixture into a positive electrode large sheet;
s3, stirring and mixing the graphite, the composite conductive agent and the water-based binder according to a certain ratio to obtain negative electrode slurry, and coating the negative electrode slurry by a coating machine according to the double-sided surface density of 70-90 g/m3Coating to form a large negative plate;
s4, rolling the positive pole sheet to obtain a compacted density of 2.5-2.8 g/m3(ii) a Rolling the anode large sheet to a compaction density of 1.2-1.3 g/m3(ii) a Rolling and splitting to obtain positive and negative plates;
s5, welding the tabs of the positive and negative electrode chips prepared in the step to corresponding positions according to a tab production mode in the middle, and completing sheet production;
s6, preparing a multiplying power type electrolyte by using the mixed lithium salt and the multiplying power type solvent;
and S7, manufacturing the electric winding core in a winding or laminating mode, obtaining the lithium ion battery through packaging, baking, injecting liquid, sealing and formation, and testing the performance of the battery.
As a further improvement of the present technical solution, in S1, the specification of the Carbon Nanotubes (CNTs) is: the particle diameter D50 of the particles is 6 to 12 mu m, the specific surface area is 0.6 to 1.2 square meters per gram, and the tap density is more than or equal to 1.5g/m3The gram capacity is 100-105 mAh/g; the material rule of the superconducting carbon black is as follows: the particle diameter D50 of the particles is 8-12 mu m, the specific surface area is 1.6-2.4 square meters per gram, and the tap density is more than or equal to 0.8g/m3The gram capacity is 330-350 mAh/g; when the composite conductive agent is prepared, the mixture ratio of the two conductive agents is as follows: carbon nanotube: the weight percentage of the superconducting carbon black is 1-3: 1-3.
As a further improvement of the technical solution, in S2, the specific method for preparing the positive electrode large sheet includes the following steps:
s2.1, mixing the lithium manganate, the composite conductive agent and the water-based binder according to the weight percentage of 85-96: 3-10: 1-5, fully dissolving the aqueous binder, mixing with other powdery raw materials, and placing in a planetary mixer for mixing operation;
s2.2, adding a proper amount of N-methyl pyrrolidone (NMP) serving as a solvent into the raw materials for a plurality of times in a small amount, and continuously stirring to prepare a muddy slurry with the solid content of 60-70%;
s2.3, testing that the viscosity of the anode slurry reaches the range of 4000-10000 mpa.s, discharging when bubbles in the slurry are removed, controlling the temperature of the slurry to be 22-28 ℃;
s2.4, selecting an aluminum foil as a current collector, and coating the current collector by a coating machine according to the density of the double surfaces of 150-250 g/m3And uniformly coating the positive electrode slurry on the front surface and the back surface of the aluminum foil to prepare a positive electrode large sheet.
As a further improvement of the technical solution, in S2.1, the specifications of the positive electrode active material raw material are as follows: the particle diameter D50 of the lithium manganate particles is 8-15 mu m, the specific surface area is 0.3-0.8 square meters per gram, and the tap density is more than or equal to 1.6g/m3The gram capacity is 95-100 mAh/g.
As a further improvement of the technical solution, in S3, the specific method for preparing the positive electrode large sheet includes the following steps:
s3.1, mixing graphite, a composite conductive agent and a water-based binder in a weight percentage of 85-96: 2-7: 1-5, fully dissolving the aqueous binder, mixing with other powdery raw materials, and placing in a planetary mixer for mixing operation;
s3.2, adding a proper amount of water or NMP as a solvent for many times in a small amount, and continuously stirring to prepare a muddy slurry with the solid content of 60-70%;
s3.3, testing that the viscosity of the negative electrode slurry reaches 1500mpa.s, discharging when bubbles in the slurry are removed completely, controlling the temperature of the slurry to be 22-28 ℃;
s3.4, selecting copper foil as a current collector, and coating by using a coating machine according to the double-sided surface density of 70-90 g/m3And uniformly coating the negative electrode slurry on the front surface and the back surface of the copper foil to prepare a negative electrode large sheet.
As a further improvement of the technical solution, in S3.1, the specifications of the negative electrode active material raw material are: the particle diameter D50 of the graphite particles is 9-13 mu m, the specific surface area is 1.8-2.8 square meters per gram, and the tap density is more than or equal to 1.0g/m3The gram volume is 340-350 mAh/g.
As a further improvement of the technical solution, in S5, high temperature adhesive tapes are adhered to the positions of the positive and negative electrode tabs welded to the tabs.
As a further improvement of this embodiment, in S6, when preparing the rate type electrolyte, a certain amount of ester solvent is added to the electrolyte.
As a further improvement of the technical solution, in S7, the specific method for preparing the lithium ion battery includes the following steps:
s7.1, separating the positive pole piece and the negative pole piece prepared in the step by using a diaphragm;
s7.2, forming a winding core around the rotating core in a winding/laminating mode;
s7.3, placing the battery core into a winding core, packaging into an electric winding core, and injecting a multiplying power type electrolyte after baking;
s7.4, sealing the battery, standing at a high temperature, and then performing formation to obtain the ultralow-temperature high-rate lithium ion battery;
and S7.5, carrying out charging and discharging operation on the prepared battery at different temperatures, and testing the performance of the battery.
As a further improvement of the present technical solution, in S7.5, the specific method for testing the battery performance includes the following steps:
s7.5.1, taking the batteries prepared in the same batch, dividing the batteries into twelve groups randomly, and respectively placing the twelve groups of batteries in an environment with the temperature of-40-70 ℃, wherein the difference of the environmental temperatures of two adjacent comparison groups is 10 ℃;
s7.5.2, repeating the charge and discharge cycles of each group of batteries at the same time, wherein each cycle does not exceed three times, and measuring and recording the charge capacity and discharge capacity of the batteries respectively;
s7.5.3, each battery group needs to be placed in the corresponding temperature environment for 10 hours;
s7.5.4, taking out each group of batteries, and observing whether the appearance of the batteries has cracks, liquid leakage and bulge;
s7.5.5, respectively calculating the charge/discharge capacity ratio of each battery in the charge and discharge test process, drawing a comparison line graph of the charge/discharge capacity ratio of all experimental battery groups, and if the charge/discharge capacity ratio of the battery is not lower than 85% in each temperature environment, judging that the performance of the battery is qualified.
Compared with the prior art, the invention has the beneficial effects that:
1. in the preparation method of the ultralow-temperature high-rate lithium ion battery for the electronic cigarette, the carbon nano tube is added with the superconducting carbon black to serve as a composite conductive agent to replace the traditional conductive agent, so that the adhesion of an active substance and a current collector is improved, and the manufacturing cost of a pole piece is reduced;
2. in the preparation method of the ultralow-temperature high-rate lithium ion battery for the electronic cigarette, a middle lug outlet mode is adopted, so that the batteries are connected in parallel, the conductivity can be improved, the internal resistance is reduced, the discharge efficiency can reach 50A/1C which is not less than 95%, the dynamic internal resistance amplification in the circulation process is reduced, the rate is improved, the cost is reduced, and the problems that the lithium ion battery cannot be normally charged and discharged at the temperature of-40-70 ℃, the capacity is attenuated and the like are solved;
3. according to the preparation method of the ultralow-temperature high-rate lithium ion battery for the electronic cigarette, the ester solvent is added into the electrolyte, so that the low-temperature performance and the rate performance of the electrolyte can be effectively improved, the polarization of the battery is inhibited, the thermal effect is reduced, the rate and the low-temperature performance are improved, the conductivity and the rate performance of the electrolyte at low temperature are improved, the sheet preparation mode is changed by optimizing material collocation, the electrolyte is configured in a new mode at the same angle, the low-temperature charge-discharge performance and the rate performance of the lithium battery are effectively improved, the stability and the safety of the lithium battery are improved, and the guarantee is provided for the application in the high-cold areas and the military industry field.
Drawings
FIG. 1 is a flow diagram of the overall manufacturing process of the present invention;
FIG. 2 is a flow chart of a partial fabrication process of the present invention;
FIG. 3 is a second flow chart of a partial fabrication process of the present invention;
FIG. 4 is a third flow chart of a partial preparation process of the present invention;
FIG. 5 is a fourth flowchart of a partial fabrication process of the present invention;
FIG. 6 is a schematic structural view of a positive electrode plate according to the present invention;
fig. 7 is a schematic structural view of a negative electrode tab of the present invention.
In the figure:
1. a positive electrode plate; 11. aluminum foil; 12. a positive electrode slurry layer; 13. a positive electrode tab; 14. first high-temperature glue;
2. a negative pole piece; 21. copper foil; 22. a negative electrode slurry layer; 23. a negative electrode tab; 24. and (7) second high-temperature glue.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "intermediate," "positive," "negative," and the like, as used herein, refer to an orientation or positional relationship based on that shown in the drawings, which is for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
Example 1
As shown in fig. 1 to 7, an object of this embodiment is to provide a method for preparing an ultralow-temperature high-rate lithium ion battery for an electronic cigarette, which includes the following steps:
s1, adding a certain amount of superconducting carbon black into the carbon nano tube to prepare a composite conductive agent to replace the original conductive agent;
s2, stirring and mixing the lithium manganate, the composite conductive agent and the water-based binder according to a certain proportion to obtain positive electrode slurry, and coating the positive electrode slurry by a coating machine according to the double-sided surface density of 150-250 g/m3Coating the mixture into a positive electrode large sheet;
s3, stirring and mixing the graphite, the composite conductive agent and the water-based binder according to a certain ratio to obtain negative electrode slurry, and coating the negative electrode slurry by a coating machine according to the double-sided surface density of 70-90 g/m3Coating to form a large negative plate;
s4, rolling the positive pole sheet to obtain a compacted density of 2.5-2.8 g/m3(ii) a Rolling the anode large sheet to a compaction density of 1.2-1.3 g/m3(ii) a Rolling and splitting to obtain positive and negative plates;
s5, welding the tabs of the positive and negative electrode chips prepared in the step to corresponding positions according to a tab production mode in the middle, and completing sheet production;
s6, preparing a multiplying power type electrolyte by using the mixed lithium salt and the multiplying power type solvent;
and S7, manufacturing the electric winding core in a winding or laminating mode, obtaining the lithium ion battery through packaging, baking, injecting liquid, sealing and formation, and testing the performance of the battery.
In this embodiment, in S1, the specification of the Carbon Nanotubes (CNTs) is: the particle diameter D50 of the particles is 6 to 12 mu m, the specific surface area is 0.6 to 1.2 square meters per gram, and the tap density is more than or equal to 1.5g/m3The gram volume is 100-105 mAh/g.
Further, the material rule of the superconducting carbon black is: the particle diameter D50 of the particles is 8-12 mu m, the specific surface area is 1.6-2.4 square meters per gram, and the tap density is more than or equal to 0.8g/m3The gram volume is 330-350 mAh/g.
Specifically, when the composite conductive agent is prepared, the mixture ratio of the two conductive agents is as follows: carbon nanotube: the weight percentage of the superconducting carbon black is 1-3: 1-3.
Wherein, the carbon nano tube can be selected from suspension liquid with mass concentration of 5-10%.
Specifically, the composite conductive agent can improve the adhesion of the active substance and the current collector, and reduce the manufacturing cost of the pole piece.
In this embodiment, in S2, the specific method for preparing the positive electrode large sheet includes the following steps:
s2.1, mixing the lithium manganate, the composite conductive agent and the water-based binder according to the weight percentage of 85-96: 3-10: 1-5, fully dissolving the aqueous binder, mixing with other powdery raw materials, and placing in a planetary mixer for mixing operation;
s2.2, adding a proper amount of N-methyl pyrrolidone (NMP) serving as a solvent into the raw materials for a plurality of times in a small amount, and continuously stirring to prepare a muddy slurry with the solid content of 60-70%;
s2.3, testing that the viscosity of the anode slurry reaches the range of 4000-10000 mpa.s, discharging when bubbles in the slurry are removed, controlling the temperature of the slurry to be 22-28 ℃;
s2.4, selecting an aluminum foil as a current collector, and coating the current collector by a coating machine according to the density of the double surfaces of 150-250 g/m3And uniformly coating the positive electrode slurry on the front surface and the back surface of the aluminum foil to prepare a positive electrode large sheet.
Specifically, in S2.1, the specifications of the positive electrode active material raw material are: the particle diameter D50 of the lithium manganate particles is 8-15 mu m, the specific surface area is 0.3-0.8 square meters per gram, and the tap density is more than or equal to 1.6g/m3The gram capacity is 95-100 mAh/g.
In addition, the positive active material includes, but is not limited to: lithium nickel cobalt manganese (LiNixCoyMn 1-x-yO)2) Lithium cobaltate (LiCoO)2) Lithium nickelate (LiNiO)2) Lithium manganate (LiMn)2O4) According to the improvement requirement of the process formula, the anode active substance can be replaced or matched.
Further, aqueous binders include, but are not limited to: styrene butadiene emulsion (SBR), sodium carboxymethylcellulose (CMC), polytetrafluoroethylene emulsion (PTFE), Polyacrylate (PAA) and the like, and one or more of the binders can be preferably matched according to the improvement requirement of the process formula.
In this embodiment, in S3, the specific method for preparing the positive electrode large sheet includes the following steps:
s3.1, mixing graphite, a composite conductive agent and a water-based binder in a weight percentage of 85-96: 2-7: 1-5, fully dissolving the aqueous binder, mixing with other powdery raw materials, and placing in a planetary mixer for mixing operation;
s3.2, adding a proper amount of water or NMP as a solvent for many times in a small amount, and continuously stirring to prepare a muddy slurry with the solid content of 60-70%;
s3.3, testing that the viscosity of the negative electrode slurry reaches 1500mpa.s, discharging when bubbles in the slurry are removed completely, controlling the temperature of the slurry to be 22-28 ℃;
s3.4, selecting copper foil as a current collector, and coating by using a coating machine according to the double-sided surface density of 70-90 g/m3And uniformly coating the negative electrode slurry on the front surface and the back surface of the copper foil to prepare a negative electrode large sheet.
Specifically, in S3.1, the specifications of the anode active material raw material are: the particle diameter D50 of the graphite particles is 9-13 mu m, the specific surface area is 1.8-2.8 square meters per gram, and the tap density is more than or equal to 1.0g/m3The gram volume is 340-350 mAh/g.
Wherein, the graphite can be suspension liquid with mass concentration of 5-10%.
In addition, the negative active material includes, but is not limited to: one or more of the artificial graphite (C) and the mesocarbon microbeads can be replaced or matched with the positive active substance according to the improvement requirement of the process formula.
In this embodiment, in S5, high-temperature tapes are adhered to the positive and negative electrode tabs and the positions welded to the tabs, so as to prevent the tabs from piercing the separator, thereby effectively improving the safety of the battery product.
As shown in fig. 6, the present embodiment provides an ultra-low temperature high-rate lithium ion battery's for electron cigarette positive pole piece 1, including aluminium foil 11, evenly coated has positive slurry layer 12 on the tow sides of aluminium foil 11, and the centre department of positive pole piece 1 has positive pole utmost point ear 13 through ultrasonic welding, and outside the edge of positive pole piece 1 was extended to the one end of positive pole utmost point ear 13, positive pole utmost point ear 13 pasted with positive pole piece 1 welded part has first high temperature glue 14.
As shown in fig. 7, the present embodiment provides a negative electrode plate 2 of an ultra-low temperature high-rate lithium ion battery for an electronic cigarette, which includes a copper foil 21, negative slurry layers 22 are uniformly coated on the front and back surfaces of the copper foil 21, a negative electrode tab 23 is welded in the middle of the negative electrode plate 2 through ultrasonic welding, one end of the negative electrode tab 23 extends out of the edge of the negative electrode plate 2, and a second high temperature adhesive 24 is adhered to the welded part of the negative electrode tab 23 and the negative electrode plate 2.
Furthermore, the mode of middle tab outlet is adopted, so that the batteries are connected in parallel, the conductivity of the batteries is better, the internal resistance is lower, the multiplying power performance of the batteries is good, the discharge efficiency can reach 50A/1C which is more than or equal to 95%, and the dynamic internal resistance amplification in the circulation process is effectively reduced.
In this example, in S6, when preparing a rate type electrolyte, a certain amount of an ester solvent is added to the electrolyte.
Further, researches show that the viscosity of the electrolyte can be effectively reduced and the melting point of the electrolyte can be reduced by adding the ester solvent into the electrolyte, so that the low-temperature performance and the rate capability of the electrolyte can be effectively improved and improved.
Among them, compared with conventional carbonate solvents such as Ethylene Carbonate (EC), Ethyl Methyl Carbonate (EMC), dimethyl carbonate (DMC), etc., the melting point of the ester solvent is significantly lower, the dielectric constant is slightly higher than that of common EMC and DMC, the viscosity at normal temperature is also lower than that of common carbonate solvents, and the viscosity of Methyl Acetate (MA) is the lowest among various ester solvents at present, so methyl acetate is preferably used as the added ester solvent.
In this embodiment, in S7, the specific method for preparing the lithium ion battery includes the following steps:
s7.1, separating the positive pole piece and the negative pole piece prepared in the step by using a diaphragm;
s7.2, forming a winding core around the rotating core in a winding/laminating mode;
s7.3, placing the battery core into a winding core, packaging into an electric winding core, and injecting a multiplying power type electrolyte after baking;
s7.4, sealing the battery, standing at a high temperature, and then performing formation to obtain the ultralow-temperature high-rate lithium ion battery;
and S7.5, carrying out charging and discharging operation on the prepared battery at different temperatures, and testing the performance of the battery.
In S7.1, the separator material used for separating the positive electrode plate from the negative electrode plate includes but is not limited to: single layer PP films, single layer PE films, double layer PP films, double layer PE films, triple layer (PP/PE/PP) films, and the like.
In S7.3, the rate type electrolyte prepared by mixing the lithium salt and the rate type solvent can improve the efficiency, stability and safety of the ultra-high rate lithium ion battery.
Further, in S7.5, the specific method for testing the performance of the battery includes the following steps:
s7.5.1, taking the batteries prepared in the same batch, dividing the batteries into twelve groups randomly, and respectively placing the twelve groups of batteries in an environment with the temperature of-40-70 ℃, wherein the difference of the environmental temperatures of two adjacent comparison groups is 10 ℃;
s7.5.2, repeating the charge and discharge cycles of each group of batteries at the same time, wherein each cycle does not exceed three times, and measuring and recording the charge capacity and discharge capacity of the batteries respectively;
s7.5.3, each battery group needs to be placed in the corresponding temperature environment for 10 hours;
s7.5.4, taking out each group of batteries, and observing whether the appearance of the batteries has cracks, liquid leakage and bulge;
s7.5.5, respectively calculating the charge/discharge capacity ratio of each battery in the charge and discharge test process, drawing a comparison line graph of the charge/discharge capacity ratio of all experimental battery groups, and if the charge/discharge capacity ratio of the battery is not lower than 85% in each temperature environment, judging that the performance of the battery is qualified.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A preparation method of an ultralow-temperature high-rate lithium ion battery for electronic cigarettes is characterized by comprising the following steps: the method comprises the following steps:
s1, adding a certain amount of superconducting carbon black into the carbon nano tube to prepare a composite conductive agent to replace the original conductive agent;
s2, stirring and mixing the lithium manganate, the composite conductive agent and the water-based binder according to a certain proportion to obtain positive electrode slurry, and coating the positive electrode slurry by a coating machine according to the double-sided surface density of 150-250 g/m3Coating the mixture into a positive electrode large sheet;
s3, stirring and mixing the graphite, the composite conductive agent and the water-based binder according to a certain ratio to obtain negative electrode slurry, and coating the negative electrode slurry by a coating machine according to the double-sided surface density of 70-90 g/m3Coating to form a large negative plate;
s4, rolling the positive pole sheet to obtain a compacted density of 2.5-2.8 g/m3(ii) a Rolling the anode large sheet to a compaction density of 1.2-1.3 g/m3(ii) a Rolling and splitting to obtain positive and negative plates;
s5, welding the tabs of the positive and negative electrode chips prepared in the step to corresponding positions according to a tab production mode in the middle, and completing sheet production;
s6, preparing a multiplying power type electrolyte by using the mixed lithium salt and the multiplying power type solvent;
and S7, manufacturing the electric winding core in a winding or laminating mode, obtaining the lithium ion battery through packaging, baking, injecting liquid, sealing and formation, and testing the performance of the battery.
2. The preparation method of the ultralow-temperature high-rate lithium ion battery for the electronic cigarette according to claim 1, characterized by comprising the following steps: in S1, the specification of the Carbon Nanotubes (CNTs) is: the particle diameter D50 of the particles is 6 to 12 mu m, the specific surface area is 0.6 to 1.2 square meters per gram, and the tap density is more than or equal to 1.5g/m3The gram capacity is 100-105 mAh/g; the material rule of the superconducting carbon black is as follows: the particle diameter D50 of the particles is 8-12 mu m, the specific surface area is 1.6-2.4 square meters per gram, and the tap density is more than or equal to 0.8g/m3The gram capacity is 330-350 mAh/g; when the composite conductive agent is prepared, the mixture ratio of the two conductive agents is: carbon nanotube: the weight percentage of the superconducting carbon black is 1-3: 1-3.
3. The preparation method of the ultralow-temperature high-rate lithium ion battery for the electronic cigarette according to claim 1, characterized by comprising the following steps: in S2, the specific method for preparing the positive electrode plate includes the following steps:
s2.1, mixing the lithium manganate, the composite conductive agent and the water-based binder according to the weight percentage of 85-96: 3-10: 1-5, fully dissolving the aqueous binder, mixing with other powdery raw materials, and placing in a planetary mixer for mixing operation;
s2.2, adding a proper amount of N-methyl pyrrolidone (NMP) serving as a solvent into the raw materials for a plurality of times in a small amount, and continuously stirring to prepare a muddy slurry with the solid content of 60-70%;
s2.3, testing that the viscosity of the anode slurry reaches the range of 4000-10000 mpa.s, discharging when bubbles in the slurry are removed, controlling the temperature of the slurry to be 22-28 ℃;
s2.4, selecting an aluminum foil as a current collector, and coating the current collector by a coating machine according to the density of the double surfaces of 150-250 g/m3And uniformly coating the positive electrode slurry on the front surface and the back surface of the aluminum foil to prepare a positive electrode large sheet.
4. The preparation method of the ultralow-temperature high-rate lithium ion battery for the electronic cigarette according to claim 3, characterized by comprising the following steps: in S2.1, the specifications of the anode active material raw materials are as follows: the particle diameter D50 of the lithium manganate particles is 8-15 mu m, the specific surface area is 0.3-0.8 square meters per gram, and the tap density is more than or equal to 1.6g/m3The gram capacity is 95-100 mAh/g.
5. The preparation method of the ultralow-temperature high-rate lithium ion battery for the electronic cigarette according to claim 1, characterized by comprising the following steps: in S3, the specific method for preparing the positive electrode plate includes the following steps:
s3.1, mixing graphite, a composite conductive agent and a water-based binder in a weight percentage of 85-96: 2-7: 1-5, fully dissolving the aqueous binder, mixing with other powdery raw materials, and placing in a planetary mixer for mixing operation;
s3.2, adding a proper amount of water or NMP as a solvent for many times in a small amount, and continuously stirring to prepare a muddy slurry with the solid content of 60-70%;
s3.3, testing that the viscosity of the negative electrode slurry reaches 1500mpa.s, discharging when bubbles in the slurry are removed completely, controlling the temperature of the slurry to be 22-28 ℃;
s3.4, selecting copper foil as a current collector, and coating by using a coating machine according to the double-sided surface density of 70-90 g/m3And uniformly coating the negative electrode slurry on the front surface and the back surface of the copper foil to prepare a negative electrode large sheet.
6. The preparation method of the ultralow-temperature high-rate lithium ion battery for the electronic cigarette according to claim 5, characterized by comprising the following steps: in S3.1, the specifications of the raw materials of the negative active material are as follows: the particle diameter D50 of the graphite particles is 9-13 mu m, the specific surface area is 1.8-2.8 square meters per gram, and the tap density is more than or equal to 1.0g/m3The gram volume is 340-350 mAh/g.
7. The preparation method of the ultralow-temperature high-rate lithium ion battery for the electronic cigarette according to claim 1, characterized by comprising the following steps: and in the S5, high-temperature adhesive tapes are adhered to the positions, welded with the tabs, of the positive and negative electrode plates.
8. The preparation method of the ultralow-temperature high-rate lithium ion battery for the electronic cigarette according to claim 1, characterized by comprising the following steps: in S6, when preparing the rate type electrolyte, a certain amount of an ester solvent is added to the electrolyte.
9. The preparation method of the ultralow-temperature high-rate lithium ion battery for the electronic cigarette according to claim 1, characterized by comprising the following steps: in S7, the specific method for preparing the lithium ion battery includes the following steps:
s7.1, separating the positive pole piece and the negative pole piece prepared in the step by using a diaphragm;
s7.2, forming a winding core around the rotating core in a winding/laminating mode;
s7.3, placing the battery core into a winding core, packaging into an electric winding core, and injecting a multiplying power type electrolyte after baking;
s7.4, sealing the battery, standing at a high temperature, and then performing formation to obtain the ultralow-temperature high-rate lithium ion battery;
and S7.5, carrying out charging and discharging operation on the prepared battery at different temperatures, and testing the performance of the battery.
10. The preparation method of the ultralow-temperature high-rate lithium ion battery for the electronic cigarette according to claim 9, characterized by comprising the following steps: in S7.5, the specific method for testing battery performance includes the following steps:
s7.5.1, taking the batteries prepared in the same batch, dividing the batteries into twelve groups randomly, and respectively placing the twelve groups of batteries in an environment with the temperature of-40-70 ℃, wherein the difference of the environmental temperatures of two adjacent comparison groups is 10 ℃;
s7.5.2, repeating the charge and discharge cycles of each group of batteries at the same time, wherein each cycle does not exceed three times, and measuring and recording the charge capacity and discharge capacity of the batteries respectively;
s7.5.3, each battery group needs to be placed in the corresponding temperature environment for 10 hours;
s7.5.4, taking out each group of batteries, and observing whether the appearance of the batteries has cracks, liquid leakage and bulge;
s7.5.5, respectively calculating the charge/discharge capacity ratio of each battery in the charge and discharge test process, drawing a comparison line graph of the charge/discharge capacity ratio of all experimental battery groups, and if the charge/discharge capacity ratio of the battery is not lower than 85% in each temperature environment, judging that the performance of the battery is qualified.
CN202111216772.5A 2021-10-19 2021-10-19 Preparation method of ultralow-temperature high-rate lithium ion battery for electronic cigarette Pending CN113851657A (en)

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