CN115312774A - Method for determining and controlling pre-lithium amount of negative electrode lithium supplement electrode piece - Google Patents
Method for determining and controlling pre-lithium amount of negative electrode lithium supplement electrode piece Download PDFInfo
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- CN115312774A CN115312774A CN202210881432.2A CN202210881432A CN115312774A CN 115312774 A CN115312774 A CN 115312774A CN 202210881432 A CN202210881432 A CN 202210881432A CN 115312774 A CN115312774 A CN 115312774A
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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
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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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- 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
- H01M4/139—Processes of 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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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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
Abstract
The invention discloses a method for determining and controlling the pre-lithium amount of a negative electrode lithium supplement electrode plate, which can accurately determine the lithium supplement capacity and control the lithium supplement amount. The method comprises the steps of removing lithium from a lithium supplementing pole piece through a small current in advance to obtain the content of active lithium capable of being extracted from the pole piece, carrying out small-rate charging and discharging on the pole piece to obtain the first coulombic efficiency of a lithium supplementing negative electrode, and calculating the first coulombic efficiency of the lithium supplementing pole piece to obtain the effective lithium amount consumed by the SEI film formed by the lithium supplementing pole piece. And after the lithium supplement efficiency is determined, calculating the surface density of the lithium foil required by the full battery, and controlling the surface density of the metal lithium foil in a mode of mechanically punching the lithium foil, so that the lithium is accurately supplemented to the full battery. By the method, the gram capacity of the positive electrode can be fully exerted, and lithium is not excessively supplemented, so that the energy density of the battery is improved.
Description
Technical Field
The invention belongs to the field of lithium ion batteries, and particularly relates to a method for determining and controlling the pre-lithium amount of a negative electrode lithium supplement electrode plate.
Background
To meet the needs of high endurance power batteries and large-scale energy storage batteries, the new generation of lithium ion batteries require higher gravimetric and volumetric energy densities. However, during the first lithium intercalation process of the negative electrode active material, the electrolyte solution can generate a reduction reaction on the particle surface to form a solid electrolyte interface film (SEI), so that the positive electrode active lithium is consumed, the gram capacity exertion of the positive electrode active material is influenced, and the energy density of the battery is reduced.
In order to compensate the loss of irreversible active lithium, the most industrialized prospect is to realize direct lithium supplement on the negative pole piece by using a method of metal lithium powder/lithium foil or lithium source sputtering. However, one technical difficulty in the lithium supplement process is the determination of the lithium supplement amount, and the lithium metal is a substance with extremely high chemical activity and can react with O in the air 2 ，H 2 O，N 2 And electrolyte and the like are subjected to chemical reaction, so that the lithium supplement amount is difficult to determine, and the lithium supplement efficiency is negatively influenced. Chinese patent CN 112993213A discloses a method for calculating the lithium supplement capacity of a negative electrode through prelithiation and application thereof, the method is characterized in that the difference between the first lithium embedding capacity and the lithium removing capacity of the negative electrode is subtracted to obtain the difference between the first lithium removing capacity and the lithium embedding capacity of the positive electrode as the lithium supplement capacity, and then the metal lithium capacity required to be loaded on the negative electrode piece is calculated according to the theoretical specific capacity of the metal lithium of 3860 mAh/g. The method does not consider the oxidation reaction of the metal lithium in the pre-lithium process, and the actual gram capacity of the lithium supplement material is less than 3860mAh/g, so that the lithium supplement capacity is insufficient. Chinese patent CN 112067672A discloses a method for testing the specific capacity of pre-lithiated lithium powder and an application thereof, the method utilizes that metal lithium powder is made into slurry to test the actual lithium removal capacity to obtain the actual gram capacity of a lithium supplement material, but the SEI film is formed on the surface of the active material after the negative active material is not considered to be added, so that the active capacity in the lithium supplement material is consumed, and the final actual gram capacity exertion is low.
Currently, the estimation of the pre-lithium amount of the pre-lithiation negative electrode piece includes a gas production and drainage method, a potentiometric titration method, an electrochemical method and the like, wherein the gas production and drainage method is only suitable for a graphite negative electrode, and when an active material contains silicon, the reaction of the silicon and water can generate hydrogen gas, so that interference is generated; the potentiometric titration method can determine the Li element content by acid-base titration, but cannot determine the metallic lithium content. The electrochemical method can accurately judge the lithium supplement amount and the lithium supplement efficiency by releasing and inserting lithium to the lithium supplement pole piece, and is a preferable scheme.
Disclosure of Invention
Aiming at the problem that the lithium supplement amount is difficult to determine in the existing lithium supplement technology, the invention aims to provide a method for determining and controlling the lithium supplement amount of a negative electrode lithium supplement pole piece, develop a method for calculating the effective lithium supplement capacity of a pre-lithiation negative electrode, and accurately calculate the lithium supplement efficiency of the negative electrode after lithium supplement.
The technical scheme adopted by the invention is as follows:
a method for determining and controlling the pre-lithium amount of a negative electrode lithium supplement electrode plate comprises the following steps:
s1, testing the first lithium-intercalated capacity of an uncompensated lithium negative pole piece, and calculating to obtain a first lithium-intercalated capacity C Minus 1 And first delithiation capacity C Minus 2 Obtaining the first coulombic efficiency of the lithium-not-supplemented negative pole piece
S2, transferring the metal lithium to the negative plate by utilizing the negative electrode lithium supplement material metal lithium foil/lithium powder or lithium source sputtering, wherein the corresponding capacity of the metal lithium is C 0 Obtaining a lithium-supplementing negative plate;
s3, soaking the lithium-supplement negative plate in the electrolyte, and standing for a certain time;
s4, assembling the lithium-supplement negative pole piece into a button or soft package half-cell, and charging the cell at a low current to obtain the first lithium removal capacity C of the lithium-supplement negative pole piece Lithium supplement 0 And calculating to obtain the first lithium intercalation capacity C in the same way as the charging and discharging in the S1 Lithium supplement 1 And secondary delithiation capacity C Lithium supplement 2 ；
S5, the effective lithium supplement amount of the lithium supplement negative pole piece consists of two parts, wherein one part is active lithium capacity C capable of being removed for the first time Lithium supplement 0 (ii) a Part of the lithium is the lithium amount C consumed when SEI is formed in advance by the metal lithium and the negative active material after the pole piece is injected SEI That is, the original active lithium capacity value required when the pole piece is not lithium-supplemented is the first lithium removal capacity divided by the first coulombic efficiency, C SEI ＝C Lithium supplement 2 /η 1 -C Lithium supplement 1 The effective lithium supplement capacity is as follows: c Effective lithium supplement ＝C Lithium supplement 0 +C Lithium supplement 2 /η 1 -C Lithium supplement 1 (ii) a Thus, the actual gram capacity of the lithium-supplement material was obtained: c' = C Effective lithium supplement M, wherein m is the mass of the lithium;
s6, testing the first lithium removal capacity C of the positive pole piece 1 is And lithium insertion capacity C 2 is positive Thus, the accurate lithium supplement surface density is obtained as follows:
wherein S is the area of the pole piece;
s7, if the required lithium supplement amount is low, carrying out pore forming on the lithium foil, wherein the pore forming rate is
Wherein M is 0 The surface density of the lithium foil with the thickness of 5um-1mm, the interval between holes is consistent in order to ensure the uniformity of lithium supplement, and the aperture needs to be moderate.
The actual gram capacity of the lithium supplement material in the battery can be accurately calculated by an electrochemical method, and the lithium supplement efficiency of the lithium supplement material can be effectively improved by controlling the soaking time of the electrolyte; by changing the assembly method of the button half-cell, the lithium-supplement negative plate is preferentially soaked in the electrolyte for a certain time, so that the gas production in the button cell can be greatly reduced, and the yield of the button cell is improved. The lithium supplementing quality required by the battery can be accurately determined through the actual gram capacity of the lithium supplementing material, the gram capacity of the positive electrode active material is fully exerted, and the energy density of the battery is greatly improved.
Preferably, the lithium supplement of the negative electrode can be lithium supplement by metal lithium foil, lithium supplement by metal lithium powder, lithium supplement by lithium alloy and lithium supplement by magnetron sputtering.
Preferably, the thickness of the lithium supplement is 0.1um to 50um.
Preferably, the negative active material includes at least one of graphite, a graphite-based negative material, a silicon-based material, silicon, a silicon-carbon composite material, a tin-based material, a metal oxide, lithium titanate, and the like.
Preferably, in the step S3, the soaking time of the lithium-supplement negative electrode piece in the electrolyte is 10min to 24h, and in order to ensure that gas production of the lithium-supplement negative electrode piece is completed and lithium loss is reduced, the soaking time is further preferably 2 to 4h.
The lithium removal current density in S4 is preferably 0.01C to 0.5C, and the rate is more preferably 0.1C to 0.2C in order to reduce the reaction time of the lithium metal with the electrolyte.
Preferably, the positive electrode material in S6 includes one of lithium iron phosphate, lithium manganate, lithium manganese iron phosphate, lithium cobaltate, lithium nickelate, ternary positive electrode, or a modified material thereof.
Preferably, the perforation manner in S7 includes one or more of mechanical pore-forming and laser pore-forming, the shape of the pores may be one or more of circular, square, rectangular, diamond, triangular and hexagonal, and the pore area may be 0.1um 2 -1cm 2 。
The invention has the beneficial effects that:
the method can accurately determine the lithium supplement capacity and control the lithium supplement amount. The method comprises the steps of removing lithium from a lithium supplementing pole piece through a small current in advance to obtain the content of active lithium capable of being extracted from the pole piece, carrying out small-rate charging and discharging on the pole piece to obtain the first coulombic efficiency of a lithium supplementing negative electrode, and calculating the first coulombic efficiency of the lithium supplementing pole piece to obtain the effective lithium amount consumed by the SEI film formed by the lithium supplementing pole piece. And after the lithium supplement efficiency is determined, calculating the surface density of the lithium foil required by the full battery, and controlling the surface density of the metal lithium foil in a manner of mechanically punching the lithium foil, so that the lithium supplement is accurately carried out on the full battery. By the method, the gram capacity of the positive electrode can be fully exerted, and lithium is not excessively supplemented, so that the energy density of the battery is improved.
Drawings
FIG. 1 is a lithium foil with porosity according to example 9 of the present invention;
FIG. 2 is a lithium foil with porosity in example 10 of the present invention;
fig. 3 is a lithium foil with porosity in example 11 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. The embodiments described herein are only for explaining the technical solution of the present invention and are not limited to the present invention.
Example 1
A method for determining and controlling the pre-lithium amount of a negative electrode lithium supplement electrode plate comprises the following specific steps:
s1, mixing an active material SiOx, artificial graphite, polyacrylic acid binder (PAA), single-arm carbon nanotubes and conductive carbon black in a ratio of 55:35:7:0.4:2.6, coating the prepared slurry on a copper foil of 10um, drying water in an oven at 110 ℃, rolling the pole piece until the compacted density is 1.6g/cc, and punching the pole piece into a wafer with the diameter of 1.5cm for later use.
S2, assembling the CR2032 button cell in a glove box, wherein a metal lithium sheet is used as a counter electrode, the electrolyte adopts an electrolyte system of 1mol/L LiPF6, and the solvent is EC: EMC: DEC =1.
And S3, standing the battery for 4 hours after liquid injection, carrying out constant current charging to a cut-off voltage of 0.05V by adopting a multiplying factor of 0.1C, and then carrying out constant current discharging to 1.5V by adopting a multiplying factor of 0.1C to obtain a first discharge capacity of 7.81mAh, a first charge capacity of 6.23mAh and a first coulombic efficiency of 79.8%.
S4, setting the thickness to be 5um and the surface density to be 2.70g/m 2 The metal lithium foil is transferred to the negative plate in S1 by rolling under the pressure of 0.2Mpa, and the environmental dew point is kept below minus 40 ℃ in the whole process or is finished under the inert atmosphere.
And S5, treating the lithium-supplement pole piece punching piece, soaking the lithium-supplement pole piece punching piece in the electrolyte used in the S2, and standing for 2 hours for later use.
And S6, assembling the lithium supplement electrode sheet into the button cell in the glove box, wherein the steps are the same as those of S2.
S7, charging the button battery assembled by the lithium supplement pole pieces to 1.5V at the multiplying power of 0.1C to obtain the reversible active lithium capacity C Lithium supplement of 0 Discharging at 0.1C rate to 0.05V for 1.01mAh to obtain first discharge capacity C Lithium supplement 1 Charging to 1.5V at 0.1C rate for 7.16mAh to obtain first charge capacity C Lithium supplement 2 =6.25mAh, according to the formula: c Effective lithium supplement ＝C Lithium supplement of 0 +C Lithium supplement 2 /η 1 -C Lithium supplement 1 To obtain C Effective lithium supplement =1.68mAh. The surface density of the lithium metal foil with the thickness of 5um is 2.70mg/cm 2 Therefore, the effective gram capacity of the lithium supplement material is 3559.3mAh/g.
Example 2
The standing time of the electrolyte in the step S5 in the example 1 is increased to 4 hours, the rest steps are unchanged, and the effective gram capacity of the lithium supplement material is calculated to be 3021.5mAh/g.
Example 3
The standing time of the electrolyte in the step S5 in the example 1 is increased to 8 hours, the rest steps are not changed, and the effective gram capacity of the lithium supplement material is 2673.4mAh/g through calculation.
Example 4
The standing time of the electrolyte in the step S5 in the example 1 is increased to 12 hours, the rest steps are not changed, and the effective gram capacity of the lithium supplement material is calculated to be 2280.1mAh/g.
Example 5
The standing time of the electrolyte in the step S5 in the example 1 is increased to 24 hours, the rest steps are unchanged, and the effective gram capacity of the lithium supplement material is calculated to be 2056.8mAh/g.
Example 6
The standing time of the electrolyte in the step S5 in the example 1 is increased to 48 hours, the rest steps are not changed, and the effective gram capacity of the lithium supplement material is 1422.7mAh/g through calculation.
Example 7
The standing time of the electrolyte in the step S5 in the example 1 is increased to 72 hours, the rest steps are unchanged, and the effective gram capacity of the lithium supplement material is calculated to be 1420.9mAh/g.
Example 8
The standing time of the electrolyte in the step S5 in the example 1 is increased to 0.5 hour, and the rest steps are unchanged, so that the prepared button cell is failed.
The actual lithium-supplementing gram capacity of the lithium-supplementing material can be obtained by changing the soaking time of the pole piece by the electrolytes of examples 1-8, and the results are shown in table 1.
TABLE 1
From examples 1 to 8, it can be seen that the real gram capacity of the lithium supplement material is related to the infiltration time of the electrolyte, the button cell directly fails due to too short infiltration time, and the lithium supplement efficiency is reduced due to too long infiltration time. Therefore, according to the effective lithium supplement values of the battery under different aging times, the lithium can be accurately supplemented to the full battery.
Example 9
A lithium ion full cell comprises a positive plate, a diaphragm, a lithium supplement negative plate and electrolyte, wherein the soaking time of the electrolyte is 4 hours, and the full cell is packaged by adopting an aluminum plastic film. The method comprises the following specific steps:
s1, manufacturing a positive plate. Subjecting LiCoO to condensation 2 PVDF and CNT are as follows 98:1:1 is dissolved in NMP solvent and mixed evenly, the slurry is coated on 12um aluminum foil with the surface density of 196.7g/m 2 And drying for later use.
S2, manufacturing the positive plate into a button half-cell, and measuring the first charging capacity C at 0.1C multiplying power 1 represents a straight chain :5.85mAh, first discharge capacity C 2 is positive ：5.56mAh。
S3, the negative plate is the negative plate in the example 1, and the first discharge capacity C is obtained Minus 1 :7.81mAh, first Charge Capacity C Minus 2 ：6.23mAh。
S4, the actual gram volume C' of the lithium supplement material in the embodiment 1: 3559.3mAh/g substituting into formula
The obtained lithium supplement surface density M is 2.05g/M 2 。
S5, die cutting size of the negative pole piece is 58mm 45mm, and die cutting size of the positive pole piece is 57mm 44mm.
And S6, calculating according to a formula to obtain the porosity epsilon =24% of the lithium foil with the thickness of 5um, selecting a round perforating needle with the radius of 3mm, forming 20 holes on the metal lithium foil with the same size as the negative plate at equal intervals, and transferring the formed metal lithium foil to the negative plate through rolling as shown in figure 1 to obtain the lithium supplement plate.
And S7, assembling the positive plate, the lithium-supplement negative electrode and the diaphragm into a lithium ion battery through a laminated battery manufacturing process, and baking, injecting liquid, standing for 4 hours and carrying out 0.1C formation to obtain the negative pre-lithiation lithium ion battery.
Example 10
Different from the example 9, a round hole needle with the radius of 4mm is selected, 12 holes are formed on the metal lithium foil with the same size as the negative plate at equal intervals, as shown in figure 2, and the rest steps are the same as the example 9.
Example 11
Unlike example 9, 48 holes were formed in a metal lithium foil having the same size as the negative electrode sheet at equal intervals by using a circular hole needle having a radius of 2mm, as shown in fig. 3, and the remaining steps were the same as in example 9.
Comparative example 1
Unlike example 9, the electrode sheet was not supplemented with lithium, and the remaining steps were the same as in example 9.
The capacity was evaluated under the same conditions as in examples 9 to 11 and comparative example 1, and the gram capacity of the positive electrode was exhibited as shown in table 2.
TABLE 2
The foregoing merely represents preferred embodiments of the invention, which are described in some detail and detail, and therefore should not be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes, modifications and substitutions can be made without departing from the spirit of the present invention, and these are all within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A method for determining and controlling the pre-lithium amount of a negative electrode lithium supplement electrode sheet is characterized by comprising the following steps: the method comprises the following steps:
s1, testing the first lithium-intercalated capacity of an uncompensated lithium negative pole piece, and calculating to obtain a first lithium-intercalated capacity C Minus 1 And first delithiation capacity C Minus 2 Obtaining the first coulomb efficiency of the lithium-not-supplemented negative pole piece
S2, transferring the metal lithium to the negative plate by utilizing the negative electrode lithium supplement material metal lithium foil/lithium powder or lithium source sputtering, wherein the corresponding capacity of the metal lithium is C 0 Obtaining a lithium-supplementing negative plate;
s3, soaking the lithium-supplement negative plate in the electrolyte, and standing for a certain time;
s4, assembling the lithium-supplement negative pole piece into a button or soft package half-cell, and charging the cell at a low current to obtain the first lithium removal capacity C of the lithium-supplement negative pole piece Lithium supplement 0 And calculating to obtain the first lithium intercalation capacity C in the same way as the charging and discharging in the S1 Lithium supplement 1 And secondary delithiation capacity C Lithium supplement 2 ；
S5, the effective lithium supplement amount of the lithium supplement negative pole piece consists of two parts, wherein one part is active lithium capacity C capable of being removed for the first time Lithium supplement of 0 (ii) a Part of the lithium is the lithium amount C consumed when SEI is formed in advance by the metal lithium and the negative active material after the pole piece is injected SEI That is, the original active lithium capacity value required when the pole piece is not lithium-supplemented is the first lithium removal capacity divided by the first coulombic efficiency, C SEI ＝C Lithium supplement 2 /η 1 -C Lithium supplement 1 The effective lithium supplement capacity is as follows: c Effective lithium supplement ＝C Lithium supplement 0 +C Lithium supplement 2 /η 1 -C Lithium supplement 1 (ii) a Thus, the actual gram capacity of the lithium-supplement material was obtained: c' = C Effective lithium supplement M, wherein m is the mass of the lithium;
s6, testing the first lithium removal capacity C of the positive pole piece 1 is And lithium insertion capacityC 2 is positive Thus, the accurate lithium supplement surface density is obtained as follows:
wherein S is the area of the pole piece;
s7, if the required lithium supplement amount is low, carrying out pore forming on the lithium foil, wherein the pore forming rate is
Wherein M is 0 The surface density of the lithium foil with the thickness of 5um-1mm, the spacing between holes is consistent in order to ensure the uniformity of lithium supplement, and the hole diameter is moderate.
2. The method for determining and controlling the pre-lithium amount of the negative lithium supplement electrode sheet according to claim 1, wherein: the lithium supplement of the negative electrode is one of lithium supplement of metal lithium foil, lithium supplement of metal lithium powder, lithium supplement of lithium alloy and lithium supplement of magnetron sputtering.
3. The method for determining and controlling the pre-lithium amount of the negative lithium supplement electrode sheet according to claim 1, wherein: the thickness of the lithium supplement is 0.1 um-50 um.
4. The method for determining and controlling the pre-lithium amount of the negative lithium supplement electrode sheet according to claim 1, wherein: the negative active material comprises at least one of graphite, a graphite-based negative material, a silicon-based material, silicon, a silicon-carbon composite material, a tin-based material, a metal oxide and lithium titanate.
5. The method for determining and controlling the pre-lithium amount of the negative lithium supplement electrode sheet according to claim 1, wherein: and in S3, the soaking time of the lithium-supplement negative plate in the electrolyte is 10 min-24 h.
6. The method for determining and controlling the pre-lithium amount of the negative lithium supplement electrode sheet according to claim 1, wherein: the density of the lithium removal current in S4 is 0.01C-0.5C.
7. The method for determining and controlling the pre-lithium amount of the negative electrode lithium supplement pole piece according to claim 1, characterized in that: the positive electrode material in S6 comprises one of lithium iron phosphate, lithium manganate, lithium manganese iron phosphate, lithium cobaltate, lithium nickelate and a ternary positive electrode or a modified material thereof.
8. The method for determining and controlling the pre-lithium amount of the negative electrode lithium supplement pole piece according to claim 1, characterized in that: the punching mode in S7 comprises one or more of mechanical hole forming and laser hole forming, the shape of the hole is one or more of round, square, rectangle, rhombus, triangle and hexagon, and the area of the hole is 0.1um 2 -1cm 2 。
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115548482A (en) * | 2022-11-29 | 2022-12-30 | 瑞浦兰钧能源股份有限公司 | Lithium supplementing method, battery preparation method and battery |
| CN116053404A (en) * | 2023-02-07 | 2023-05-02 | 江苏正力新能电池技术有限公司 | Lithium ion battery negative plate and preparation method thereof |
| CN116773607A (en) * | 2023-08-24 | 2023-09-19 | 宁德时代新能源科技股份有限公司 | Method and equipment for detecting lithium supplementing quantity |
| CN117129888A (en) * | 2023-03-03 | 2023-11-28 | 荣耀终端有限公司 | Method for determining lithium supplementing amount of negative electrode, verification method, battery and terminal device |
| CN117169748A (en) * | 2023-10-19 | 2023-12-05 | 荣耀终端有限公司 | Detection method for gram capacity of lithium-supplementing electrode slice |
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- 2022-07-26 CN CN202210881432.2A patent/CN115312774A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115548482A (en) * | 2022-11-29 | 2022-12-30 | 瑞浦兰钧能源股份有限公司 | Lithium supplementing method, battery preparation method and battery |
| CN116053404A (en) * | 2023-02-07 | 2023-05-02 | 江苏正力新能电池技术有限公司 | Lithium ion battery negative plate and preparation method thereof |
| CN116053404B (en) * | 2023-02-07 | 2024-01-19 | 江苏正力新能电池技术有限公司 | Lithium ion battery negative plate and preparation method thereof |
| CN117129888A (en) * | 2023-03-03 | 2023-11-28 | 荣耀终端有限公司 | Method for determining lithium supplementing amount of negative electrode, verification method, battery and terminal device |
| CN116773607A (en) * | 2023-08-24 | 2023-09-19 | 宁德时代新能源科技股份有限公司 | Method and equipment for detecting lithium supplementing quantity |
| CN116773607B (en) * | 2023-08-24 | 2024-04-12 | 宁德时代新能源科技股份有限公司 | Method and equipment for detecting lithium supplementing quantity |
| CN117169748A (en) * | 2023-10-19 | 2023-12-05 | 荣耀终端有限公司 | Detection method for gram capacity of lithium-supplementing electrode slice |
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