CN110828886A - Three-electrode lithium ion battery and preparation method thereof - Google Patents
Three-electrode lithium ion battery and preparation method thereof Download PDFInfo
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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
- 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
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- 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
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- 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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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- 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
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- 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
Abstract
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a three-electrode lithium ion battery which comprises a battery shell, a bare cell and a lithium titanate pole piece, wherein the bare cell and the lithium titanate pole piece are packaged in the battery shell, the bare cell is provided with a positive pole lug and a negative pole lug which are led out of the battery shell, and the lithium titanate pole piece is provided with a reference pole lug which is led out of the battery shell. Compared with the prior art, the problem that the cell interface structure is easy to damage is solved, and the test accuracy and the test stability are greatly improved. In addition, the invention also provides a preparation method of the three-electrode lithium ion battery, which is simple to operate and solves the problem of high difficulty in the manufacturing process of the conventional three-electrode lithium ion battery.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a three-electrode lithium ion battery and a preparation method thereof.
Background
Lithium ion batteries have the advantages of high energy density, long cycle life, and the like, are widely applied to portable electronic devices, and are also popularized in the fields of electric vehicles and the like.
However, the applications of materials for various parts are approaching the use limit, and consumers also put higher requirements on the energy density of batteries, the cycle life and the environmental suitability into consideration. The current battery design is also changing the thinking, improves the multiplying power performance of battery in order to satisfy the demand of filling soon to realize the capacity improvement on the actual use condition. This puts higher demands on the negative electrode material, and the risk of lithium deposition increases, so the lithium deposition of the negative electrode needs to be paid attention to in real time in the cell design. Generally, three electrodes are frequently used for platform research and development to know the interface conditions of the positive electrode and the negative electrode, but the conventional methods of adding a lithium electrode, plating lithium on a copper wire and the like are difficult to ensure that the interface of the surface of the lithium electrode is stable and smooth, so that the experimental result is influenced.
In view of the above, there is a need to develop a three-electrode lithium ion battery with easy preparation and stable interface to ensure that accurate and reliable electrical signal data can be obtained during the monitoring process.
Disclosure of Invention
One of the objects of the present invention is: aiming at the defects of the prior art, the three-electrode lithium ion battery is provided, the problems that the difficulty is high and the cell interface structure is easy to damage in the manufacturing process are solved, and the test accuracy and the stability are greatly improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a three-electrode lithium ion battery comprises a battery shell, a bare cell and a lithium titanate pole piece, wherein the bare cell and the lithium titanate pole piece are packaged in the battery shell, the bare cell is provided with a positive pole lug and a negative pole lug which are led out of the battery shell, and the lithium titanate pole piece is provided with a reference pole lug which is led out of the battery shell.
As an improvement of the three-electrode lithium ion battery, the lithium titanate pole piece comprises a foil layer and a lithium titanate slurry layer arranged on the surface of the foil layer, wherein the lithium titanate slurry layer comprises 50-98 wt% of lithium titanate, 1-30 wt% of a conductive agent and 1-10 wt% of a binder.
As an improvement of the three-electrode lithium ion battery of the present invention, the conductive agent includes at least one of conductive acetylene black, ketjen black, conductive carbon black, carbon nanotubes, carbon fibers, and graphene.
As an improvement of the three-electrode lithium ion battery, the binder is polyvinylidene fluoride and N-N-dimethyl pyrrolidone, and the molecular weight of the polyvinylidene fluoride is 50-200 ten thousand.
As an improvement of the three-electrode lithium ion battery, the binder is any one of polyacrylic acid, polyaniline, polytetrafluoroethylene and polyimide.
As an improvement of the three-electrode lithium ion battery, the bare cell is formed by winding and/or laminating a positive plate, a diaphragm and a negative plate; the positive pole tab is led out from the positive pole piece, and the negative pole tab is led out from the negative pole piece.
As an improvement of the three-electrode lithium ion battery, the anode tab is an aluminum tab, the cathode tab is a nickel tab, and the reference electrode tab is an aluminum tab.
The three-electrode lithium ion battery provided by the invention is improved by further comprising an upper pressing plate and a lower pressing plate, wherein the upper pressing plate and the lower pressing plate are respectively clamped on two sides of the battery shell.
Another object of the invention is: the preparation method of the three-electrode lithium ion battery comprises the following steps:
s1, forming the positive plate, the diaphragm and the negative plate into a naked battery cell by winding and/or laminating;
and S2, packaging the bare cell and the lithium titanate pole piece in a battery shell, and completing preparation of the three-electrode lithium ion battery through baking, liquid injection, standing, formation, secondary sealing and capacity test.
As an improvement of the method for manufacturing a three-electrode lithium ion battery according to the present invention, the method further includes step S3, in which an upper pressing plate and a lower pressing plate are clamped between two surfaces of the battery case.
Compared with the prior art, the invention has the beneficial effects that:
1) the lithium titanate pole piece has the characteristics of stable interface and stable charging and discharging voltage, is used as a reference electrode, avoids the problem that the interface structure of the battery cell is easy to damage, and can be greatly improved in the aspects of test accuracy and stability depending on a voltage platform with stable lithium titanate.
2) The lithium titanate pole piece is used as the reference electrode to manufacture the three-electrode lithium ion battery, the manufacturing process is simple, and the problem of high manufacturing difficulty caused by the fact that an additional lithium piece and copper wire lithium plating are used as the reference electrode in the conventional three-electrode lithium ion battery is solved.
Drawings
Fig. 1 is one of the structural schematic diagrams of a three-electrode lithium ion battery of the present invention.
Fig. 2 is a second schematic diagram of the structure of the three-electrode lithium ion battery of the present invention.
Fig. 3 is an interface impedance analysis spectrum of the full cell, the positive electrode, and the negative electrode in example 1.
Fig. 4 is an interface impedance analysis map of the full cell, the positive electrode, and the negative electrode in comparative example 1.
Fig. 5 is an interface impedance analysis map of the full cell, the positive electrode, and the negative electrode in comparative example 1.
Wherein: the lithium battery comprises a battery shell 1, a bare cell 2, a lithium titanate pole piece 3, a positive pole lug 4, a negative pole lug 5, a reference pole lug 6, an upper pressing plate 7 and a lower pressing plate 8.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and the accompanying drawings, but the embodiments of the invention are not limited thereto.
As shown in fig. 1-2, a three-electrode lithium ion battery includes a battery case 1, and a bare cell 2 and a lithium titanate electrode plate 3 packaged in the battery case 1, wherein the bare cell 2 is provided with a positive electrode tab 4 and a negative electrode tab 5 led out of the battery case 1, and the lithium titanate electrode plate 3 is provided with a reference electrode tab 6 led out of the battery case 1.
Further, the lithium titanate pole piece 3 comprises a foil layer and a lithium titanate slurry layer arranged on the surface of the foil layer, wherein the lithium titanate slurry layer comprises 50-98 wt% of lithium titanate, 1-30 wt% of a conductive agent and 1-10 wt% of a binder.
Further, the conductive agent includes at least one of conductive acetylene black, ketjen black, conductive carbon black, carbon nanotubes, carbon fibers, and graphene.
Furthermore, the binder is polyvinylidene fluoride and N-N-dimethyl pyrrolidone, and the molecular weight of the polyvinylidene fluoride is 50-200 ten thousand.
Further, the binder is any one of polyacrylic acid, polyaniline, polytetrafluoroethylene and polyimide.
Further, the bare cell 1 is formed by winding and/or laminating a positive plate, a diaphragm and a negative plate; the positive electrode tab 4 is led out from the positive plate, and the negative electrode tab 5 is led out from the negative plate.
Further, the positive electrode tab 4 is an aluminum tab, the negative electrode tab 5 is a nickel tab, and the reference electrode tab 6 is an aluminum tab.
Further, the three-electrode lithium ion battery further comprises an upper pressing plate 7 and a lower pressing plate 8, wherein the upper pressing plate 7 and the lower pressing plate 8 are respectively clamped on two sides of the battery shell 1.
Example 1
Preparing a positive plate: high-voltage 4.4V positive electrode active material lithium cobaltate (purchased from Tianjinbamao), CNTs (carbon nanotubes), conductive carbon black and PVDF (polyvinylidene fluoride) are mixed according to the mass ratio of 97: 0.5: 1: 1.5, uniformly mixing, and then dispersing in N-methyl-2-pyrrolidone (NMP) to obtain anode slurry; and uniformly coating the anode slurry on two sides of the aluminum foil, rolling and cutting to obtain an anode plate, and finally baking and vacuum drying for later use.
Preparing a negative plate: negative electrode material (purchased from Jiangxi purple light in), conductive carbon black, CMC (carboxymethyl cellulose) and SBR/PAA in a mass ratio of 95: 1.5: 1.5: 2, uniformly mixing, and then dispersing in deionized water to obtain negative electrode slurry; and uniformly coating the negative electrode slurry on two surfaces of the copper foil, rolling and cutting to obtain a negative electrode plate, and finally baking and vacuum drying for later use.
Preparation of a reference electrode (lithium titanate pole piece): lithium titanate, conductive carbon black and PVDF (polyvinylidene fluoride) are mixed according to the mass ratio of 90: 5: 5, uniformly mixing, and then dispersing in N-methyl-2-pyrrolidone (NMP) to obtain lithium titanate slurry; uniformly coating the lithium titanate slurry on an aluminum foil to form a lithium titanate slurry layer, rolling and cutting to obtain a lithium titanate pole piece, welding a nickel tab and a diaphragm for wrapping, and finally baking and vacuum drying for later use.
Preparing a lithium ion battery: forming a bare cell by winding and/or laminating the positive plate, the diaphragm and the negative plate; packaging a bare cell and a lithium titanate pole piece in a battery shell, and performing baking, liquid injection, standing, formation, secondary sealing and capacity test to finish the preparation of the three-electrode lithium ion battery; and clamping the upper pressing plate and the lower pressing plate on two surfaces of the battery shell.
Example 2
In contrast to example 1, a reference electrode (lithium titanate electrode sheet) was prepared:
lithium titanate, conductive acetylene black and PVDF (polyvinylidene fluoride) are mixed according to the mass ratio of 95: 3: 2, uniformly mixing, and then dispersing in N-methyl-2-pyrrolidone (NMP) to obtain lithium titanate slurry; uniformly coating the lithium titanate slurry on an aluminum foil to form a lithium titanate slurry layer, rolling and cutting to obtain a lithium titanate pole piece, welding a nickel tab and a diaphragm for wrapping, and finally baking and vacuum drying for later use.
The rest is the same as embodiment 1, and the description is omitted here.
Example 3
In contrast to example 1, a reference electrode (lithium titanate electrode sheet) was prepared:
lithium titanate, a carbon nano tube and PVDF (polyvinylidene fluoride) are mixed according to the mass ratio of 92: 5: 3, uniformly mixing, and then dispersing in N-methyl-2-pyrrolidone (NMP) to obtain lithium titanate slurry; uniformly coating the lithium titanate slurry on an aluminum foil to form a lithium titanate slurry layer, rolling and cutting to obtain a lithium titanate pole piece, welding a nickel tab and a diaphragm for wrapping, and finally baking and vacuum drying for later use.
The rest is the same as embodiment 1, and the description is omitted here.
Example 4
In contrast to example 1, a reference electrode (lithium titanate electrode sheet) was prepared:
lithium titanate, Ketjen black, carbon fiber and polyacrylic acid are mixed according to a mass ratio of 88: 8: 4, uniformly mixing to obtain lithium titanate slurry; uniformly coating the lithium titanate slurry on an aluminum foil to form a lithium titanate slurry layer, rolling and cutting to obtain a lithium titanate pole piece, welding a nickel tab and a diaphragm for wrapping, and finally baking and vacuum drying for later use.
The rest is the same as embodiment 1, and the description is omitted here.
Example 5
In contrast to example 1, a reference electrode (lithium titanate electrode sheet) was prepared:
lithium titanate, a carbon nano tube, graphene and polytetrafluoroethylene are mixed according to the mass ratio of 98: 1: 1, uniformly mixing to obtain lithium titanate slurry; uniformly coating the lithium titanate slurry on an aluminum foil to form a lithium titanate slurry layer, rolling and cutting to obtain a lithium titanate pole piece, welding a nickel tab and a diaphragm for wrapping, and finally baking and vacuum drying for later use.
The rest is the same as embodiment 1, and the description is omitted here.
Comparative example 1
In contrast to example 1, a reference electrode was prepared:
in a nitrogen-filled glove box (O)2＜2ppm，H2O < 3ppm) or dew point protected room (dew point)<At-50 ℃), adding lithium goldScraping the passivation layer on the surface of the metal belt, and fixing the passivation layer on the nickel tab by using a diaphragm and adhesive paper; and encapsulating below the naked electric core, adding electrolyte and finishing encapsulation.
The rest is the same as embodiment 1, and the description is omitted here.
Comparative example 2
In contrast to example 1, a reference electrode was prepared:
in a nitrogen-filled glove box (O)2＜2ppm，H2O < 3ppm) or dew point protected room (dew point)<And (4) introducing a copper wire into the bare cell to terminate at-50 ℃, then packaging into an aluminum plastic film, baking, injecting liquid, standing, performing clamp formation, performing secondary sealing, and performing capacity test to finish the preparation of the lithium ion soft package battery.
And the battery needs to be subjected to a lithium plating process before performance test, and is subjected to normal test after being electroplated for 1-2 hours by 0.05-3 mA.
The rest is the same as embodiment 1, and the description is omitted here.
Performance testing
The lithium ion batteries prepared in example 1 and comparative examples 1-2 were tested for their respective relevant properties, including EIS (electrochemical impedance) and DCIR (direct current resistance) tests, using the following specific test methods:
EIS test: at 25 ℃, the anode and cathode of the half-electric core and the reference electrode are respectively inserted into a test instrument, so that the impedance analysis spectrums (0.06Hz-100kHz) of the whole, anode and cathode interfaces can be obtained and decomposed. As shown in FIGS. 3-5.
DCIR test: testing DCIR under four conditions of 90% SOC, 70% SOC, 50% SOC and 30% SOC, flow: performing 0.1C charge, 0.025C cut-off/0.1C discharge cycles (the cycle charge-discharge current is calculated as rated capacity) to obtain initial discharge capacity Q1, discharging to 90% SOC (reference initial discharge capacity Q1) at 0.1C after the charge, standing, discharging to 60s at 0.1C (rated capacity), discharging to 300s at 1C (rated capacity), standing for 300s, discharging to 70% SOC (reference initial discharge capacity Q1) at 0.1C (rated capacity), standing, discharging to 60s at 0.1C (rated capacity), discharging to 300s at 1C (rated capacity), standing for 300s, and discharging (discharging) to 0.1C (rated capacity) (reference initial discharge capacity Q1)Rated capacity) to 50% SOC (reference initial discharge capacity Q1), left standing, 0.1C (for rated capacity) discharge for 60s, 1C (for rated capacity) discharge for 300s, left standing for 300s, then 0.1C (for rated capacity) discharge to 30% SOC (reference initial discharge capacity Q1), left standing, 0.1C (for rated capacity) discharge for 60s, 1C (for rated capacity) discharge for 300s, left standing for 300s, then 0.1C (for rated capacity) discharge to complete discharge, and then three-electrode voltage potential is recorded throughout the entire period, and DCIR (U) is (U) according to the formula0-U1)/(I1-I0) DCIR values were calculated for different SOC states.
The results of the above tests are shown in tables 1 to 2 and FIGS. 3 to 5.
TABLE 1 EIS test results
TABLE 2-1 DCIR test results
TABLE 2-2 DCIR test results
The numerical value of each part impedance of the positive electrode and the negative electrode can be obtained through a three-electrode EIS test, and the total electrochemical impedance (Rsum) of the whole full battery can be divided into positive electrode ohmic impedance (Rcat./s), negative electrode ohmic impedance (ran./s), negative electrode SEI film impedance (ran./SEI) and positive electrode electron transfer impedance (Rcat./ct), wherein the sum of the positive electrode ohmic impedance and the negative electrode ohmic impedance is basically equal to the ohmic impedance (Rs) of the whole battery core, the SEI film impedance mainly comes from the negative electrode, and the electron transfer impedance mainly comes from the positive electrode. As can be seen from the test data in table 1, the EIS data obtained in example 1 (the reference electrode is a lithium titanate electrode plate) is substantially consistent with that obtained in comparative example 1 (the additional lithium strip is used as a reference), while the EIS signal obtained by plating lithium on a copper wire in comparative example 2 is very unstable and unreliable.
In addition, in tables 2-1 and 2-2, DCIR-1 values represent DCIR values converted from 0.1C-60s to 1.0C-1s, and DCIR-2 values represent DCIR values converted from 0.1C-60s to 1.0C-300 s. The above two values have theoretical meanings that the DCIR-1 value is basically equal to the sum of ohmic resistance (Rs), SEI (SEI) and electron activation resistance (Rct) of the battery core, and the DCIR-2 value is basically equal to the above three values together with diffusion resistance (Rp), so that the difference between the two values can also roughly represent the magnitude of the Rp. The DCIR data tested by the experiments of the examples and the comparative examples show that the DCIR value obtained by the lithium titanate pole piece as the reference electrode is larger than that obtained by the negative electrode of the electrical signal data of the three electrodes of the additional lithium belt, the impedance is easier to test and analyze, no difference exists in the test of the positive electrode, and the signals are very stable. Furthermore, the size of the diffusion resistance Rp is almost the same as that of the diffusion resistance Rp, indicating that the method of the embodiment using the lithium titanate electrode sheet as the reference electrode is a reliable and effective method.
In conclusion, the lithium titanate pole piece does not have any influence on the test data result relative to the lithium strip as the reference electrode, the preparation process is simple, the dependence on the environment is not high, and the test is easy to be carried out under simple conditions. Compared with a copper wire lithium-plated reference electrode, the test stability is better.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A three-electrode lithium ion battery is characterized in that: the lithium titanate battery comprises a battery shell, a bare cell and a lithium titanate pole piece, wherein the bare cell and the lithium titanate pole piece are packaged in the battery shell, the bare cell is provided with a positive pole lug and a negative pole lug which are led out of the battery shell, and the lithium titanate pole piece is provided with a reference pole lug which is led out of the battery shell.
2. The three-electrode lithium ion battery of claim 1, wherein: the lithium titanate pole piece comprises a foil layer and a lithium titanate slurry layer arranged on the surface of the foil layer, wherein the lithium titanate slurry layer comprises 50-98 wt% of lithium titanate, 1-30 wt% of a conductive agent and 1-10 wt% of a binder.
3. The three-electrode lithium ion battery of claim 2, wherein: the conductive agent includes at least one of conductive acetylene black, ketjen black, conductive carbon black, carbon nanotubes, carbon fibers, and graphene.
4. The three-electrode lithium ion battery of claim 2, wherein: the binder is polyvinylidene fluoride and N-N-dimethyl pyrrolidone, and the molecular weight of the polyvinylidene fluoride is 50-200 ten thousand.
5. The three-electrode lithium ion battery of claim 2, wherein: the binder is any one of polyacrylic acid, polyaniline, polytetrafluoroethylene and polyimide.
6. The three-electrode lithium ion battery of claim 1, wherein: the bare cell is formed by winding and/or laminating a positive plate, a diaphragm and a negative plate; the positive pole tab is led out from the positive pole piece, and the negative pole tab is led out from the negative pole piece.
7. The three-electrode lithium ion battery of claim 1, wherein: the positive electrode lug is an aluminum lug, the negative electrode lug is a nickel lug, and the reference electrode lug is an aluminum lug.
8. The three-electrode lithium ion battery of claim 1, wherein: the battery shell is characterized by further comprising an upper pressing plate and a lower pressing plate, wherein the upper pressing plate and the lower pressing plate are respectively clamped on two sides of the battery shell.
9. A preparation method of the three-electrode lithium ion battery of any one of claims 1 to 8, characterized by comprising the following steps:
s1, forming the positive plate, the diaphragm and the negative plate into a naked battery cell by winding and/or laminating;
and S2, packaging the bare cell and the lithium titanate pole piece in a battery shell, and completing preparation of the three-electrode lithium ion battery through baking, liquid injection, standing, formation, secondary sealing and capacity test.
10. The method of claim 9, further comprising a step S3 of clamping an upper pressing plate and a lower pressing plate to both surfaces of the battery case.
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| CN111509304A (en) * | 2020-04-27 | 2020-08-07 | 惠州亿纬锂能股份有限公司 | Lithium ion three-electrode and preparation method and application thereof |
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| CN113285133A (en) * | 2021-05-24 | 2021-08-20 | 中南大学 | In-situ test device and test method for potential distribution of lithium ion battery |
| CN113422115A (en) * | 2021-07-02 | 2021-09-21 | 广州小鹏汽车科技有限公司 | Lithium ion battery cell, preparation method of lithium ion battery cell and lithium analysis detection method |
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| CN114551790A (en) * | 2021-07-08 | 2022-05-27 | 万向一二三股份公司 | Three-electrode all-solid-state lithium ion battery and preparation method thereof |
| CN116072813A (en) * | 2021-11-02 | 2023-05-05 | 宁德时代新能源科技股份有限公司 | Method for producing reference electrode, method for producing three-electrode cell, three-electrode cell |
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