CN116840711A - Method for representing lithium analysis window by using battery polarization potential - Google Patents
Method for representing lithium analysis window by using battery polarization potential Download PDFInfo
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- CN116840711A CN116840711A CN202310863514.9A CN202310863514A CN116840711A CN 116840711 A CN116840711 A CN 116840711A CN 202310863514 A CN202310863514 A CN 202310863514A CN 116840711 A CN116840711 A CN 116840711A
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 83
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 83
- 230000010287 polarization Effects 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000004458 analytical method Methods 0.000 title claims abstract description 23
- 238000001556 precipitation Methods 0.000 claims abstract description 32
- 238000012360 testing method Methods 0.000 claims abstract description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 23
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 8
- 239000003153 chemical reaction reagent Substances 0.000 claims description 5
- 238000011056 performance test Methods 0.000 claims description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 13
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 13
- 238000000926 separation method Methods 0.000 abstract description 7
- 238000004804 winding Methods 0.000 description 5
- 238000007747 plating Methods 0.000 description 4
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 3
- 230000002687 intercalation Effects 0.000 description 3
- 238000009830 intercalation Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000009831 deintercalation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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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
-
- 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]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a method for representing a lithium analysis window by utilizing battery polarization potential, and belongs to the technical field of lithium ion batteries. The invention comprises the following steps that a standard charge-discharge potential curve is obtained through a power buckling battery; setting different multiplying powers, and carrying out charge and discharge tests of the different multiplying powers on the three-electrode battery to obtain charge and discharge potential curves of the positive electrode and the negative electrode of the three-electrode battery under each multiplying power; comparing the charge-discharge potential curve of the positive electrode and the negative electrode of the three-electrode battery under each multiplying power with the standard charge-discharge potential curve, and calculating the polarization potential of the three-electrode battery under each multiplying power through the potential difference value at the position where the two curves deviate from the maximum; and disassembling the three-electrode battery to obtain the polarization potential and the charge-discharge multiplying power at the beginning of lithium precipitation. The invention is mainly used for further reducing the lithium ion battery lithium separation risk, utilizing the correlation between the lithium separation and polarization of the battery, utilizing the polarization potential to represent the lithium separation window, and pre-judging the internal condition of the battery core in advance, thereby making a better charging strategy and improving the battery performance.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a method for representing a lithium analysis window by utilizing battery polarization potential.
Background
With the shortage of energy and the deterioration of the environment, new energy technologies are being increasingly used and promoted. The lithium ion battery has the characteristics of high energy density, less self discharge, good cycle performance and environment-friendly product, and the characteristics lead to rapid development of the lithium ion battery.
When a battery is charged and discharged, a phenomenon that the potential deviates from the equilibrium potential occurs when the battery passes current, and the phenomenon is called battery polarization. The polarization potential is the difference between the actual potential and the equilibrium potential, and is used to measure the degree of polarization. Polarization is classified into three types, electrochemical polarization, concentration polarization and ohmic polarization. Wherein ohmic polarization is polarization due to electrolyte, electrode material, separator resistance and contact resistance existing between various constituent parts, which occurs instantaneously and is constant, and is affected only by the magnitude of current. Concentration polarization and electrochemical polarization can be mitigated and addressed to be reduced by various means, and reduced polarization can further enhance cell performance.
When a lithium ion battery is charged, li+ is extracted from the positive electrode and inserted into the negative electrode. However, when some abnormal conditions occur, such as insufficient lithium intercalation space of the negative electrode, too large resistance of the li+ intercalation of the negative electrode, too fast deintercalation of the li+ from the positive electrode but not equivalent intercalation of the negative electrode, the li+ which cannot be intercalated into the negative electrode can only get electrons on the surface of the negative electrode, thereby forming silvery white metallic lithium simple substance, which is also called lithium precipitation. The lithium precipitation not only reduces the battery performance and shortens the cycle life greatly, but also limits the quick charge capacity of the battery, and can cause disastrous consequences such as combustion, explosion and the like. Therefore, it is necessary to develop a good charging strategy to avoid the occurrence of lithium precipitation and improve the service performance of the battery.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention provides a method for representing a lithium analysis window by utilizing battery polarization potential, is used for solving the problem of further reducing the lithium ion battery lithium precipitation risk, and the correlation between lithium analysis and polarization of the battery is utilized, a lithium analysis window is characterized by utilizing polarization potential, and the condition inside the battery cell is pre-judged in advance, so that a better charging strategy is formulated, and the battery performance is improved.
2. Technical proposal
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
a method for characterizing a lithium analysis window by using a battery polarization potential comprises the following steps,
s1, manufacturing a button cell comprising a positive pole piece and a lithium piece, a button cell comprising a negative pole piece and a lithium piece and a button cell comprising a positive pole piece and a negative pole piece;
s2, charging and discharging the electric buckling battery with a set multiplying power to obtain a standard charging and discharging potential curve of the anode and the cathode of the electric buckling battery;
s3, manufacturing a coiled core battery, and arranging a reference electrode on the coiled core battery to obtain a three-electrode battery;
s4, setting different multiplying powers, and performing charge and discharge tests of the three-electrode battery at the different multiplying powers to obtain charge and discharge potential curves of the positive electrode and the negative electrode of the three-electrode battery under each multiplying power;
s5, comparing the charge-discharge potential curve of the positive electrode and the negative electrode of the three-electrode battery under each multiplying power with the standard charge-discharge potential curve, and calculating to obtain the polarization potential of the three-electrode battery under each multiplying power through the potential difference value at the position where the two curves deviate from the maximum;
s6, disassembling the three-electrode battery to obtain the polarization potential and the charge-discharge multiplying power at the beginning of lithium precipitation.
Further, in step S1, the pole piece of the battery is manufactured in step S3.
Further, in step S2, the set magnification is 0.1C or less.
Further, in step S3, a copper wire is connected to the wound core battery, wherein one end of the copper wire led out is used as a reference electrode to form a three-electrode battery.
Further, in step S4, the method of setting the different magnifications is to take the values of the different magnifications around 1C.
Further, the different multiplying power values are gradually increased from small to large.
Further, in step S4, the method for performing the charge and discharge test of different multiplying powers on the three-electrode battery and obtaining the charge and discharge potential curve of the positive electrode and the negative electrode of the three-electrode battery under each multiplying power is that a multichannel instrument is adopted to connect three voltage channels of positive electrode-reference electrode, negative electrode-reference electrode and positive electrode-negative electrode of the three-electrode battery, and meanwhile, an electrical performance test cabinet is connected with the positive electrode and the negative electrode of the three-electrode battery to start the charge and discharge test of different multiplying powers.
Further, in step S6, the charge-discharge rate at the beginning of the lithium precipitation is the minimum rate corresponding to the battery generating the lithium precipitation in the different rates in step S4.
Further, the polarization potential at the beginning of lithium precipitation is the polarization potential corresponding to the minimum multiplying power.
Further, the positive electrode plate and the negative electrode plate of the button cell are firstly wiped by adopting a reagent before being manufactured.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) According to the method for representing the lithium-precipitation window by utilizing the battery polarization potential, lithium precipitation usually occurs at the end stage of charging, lithium ions in the battery are enriched in the negative electrode, the polarization is larger, and the risk of lithium precipitation is increased. The method utilizes the battery polarization potential to represent the lithium analysis window, is favorable for prejudging the internal condition of the battery cell in advance, is favorable for optimizing and formulating a charging strategy subsequently, improves the battery performance, and realizes the improvement of the cycle life of the battery on the basis of not changing the original design of the battery and not increasing the material and labor cost, thereby saving the cost.
(2) According to the method for representing the lithium precipitation window by utilizing the battery polarization potential, the standard charge-discharge potential curve of the anode and the cathode is obtained, the potential curve of the charge-discharge test of the three-electrode battery under different multiplying powers is compared with the standard potential curve, the polarization potential under different multiplying powers is judged, the minimum charge multiplying power causing lithium precipitation is determined by disassembling the battery, the polarization potential at the beginning of lithium precipitation is obtained, and whether the subsequent charge-discharge strategy causes lithium precipitation is judged according to the potential. The lithium ion battery can react more accurately and the lithium ion battery can be predicted to have lithium ion under a certain multiplying power.
(3) According to the method for representing the lithium analysis window by using the battery polarization potential, the charge and discharge curve under each multiplying power is compared with the standard curve, so that the difference between the charge and discharge curve under different multiplying powers and the standard curve can be obtained, and the difference represents the polarization condition of the rechargeable battery under the multiplying power. By comparing the negative electrode potential curve under the charging condition, the difference between the standard potential and the working potential can be obtained at the charging end, namely the polarization potential of lithium precipitation.
(4) According to the method for representing the lithium analysis window by utilizing the battery polarization potential, when the button cell is manufactured, the positive and negative electrode single-sided pole pieces and the lithium piece are respectively manufactured, the lithium piece is used as a counter electrode to eliminate the influence on the electrode, and the polarization is further eliminated by adopting a small multiplying power, so that a standard potential curve of the positive and negative electrodes which is closer to the standard curve is obtained.
Drawings
FIG. 1 is a standard charge-discharge curve of a battery cell;
FIG. 2 is a graph showing the comparison of the negative potential curve of a three-electrode battery with the negative potential curve of a button cell.
Detailed Description
For a further understanding of the present invention, the present invention will be described in detail with reference to the drawings and examples.
Because the battery lithium separation and the battery polarization have correlation, lithium ions are enriched in the negative electrode at the end stage of battery charging, the polarization is increased, and the lithium separation risk is increased, the embodiment provides a method for representing the lithium separation window by using the battery polarization potential, and the method for representing the battery lithium separation window by using the polarization potential is beneficial to pre-judging the condition in the battery core in advance, is beneficial to optimizing and formulating a charging strategy subsequently, and improves the battery performance.
The method for characterizing the lithium analysis window by utilizing the battery polarization potential in the embodiment comprises the following steps:
s1, manufacturing a button cell comprising a positive pole piece and a lithium piece, a button cell comprising a negative pole piece and a lithium piece and a button cell comprising a positive pole piece and a negative pole piece;
s2, charging and discharging the electric buckling battery with a set multiplying power to obtain a standard charging and discharging potential curve of the anode and the cathode of the electric buckling battery;
s3, manufacturing a coiled core battery, and arranging a reference electrode on the coiled core battery to obtain a three-electrode battery;
s4, setting different multiplying powers, and performing charge and discharge tests of the three-electrode battery at the different multiplying powers to obtain charge and discharge potential curves of the positive electrode and the negative electrode of the three-electrode battery under each multiplying power;
s5, comparing the charge-discharge potential curve of the positive electrode and the negative electrode of the three-electrode battery under each multiplying power with the standard charge-discharge potential curve, and calculating to obtain the polarization potential of the three-electrode battery under each multiplying power through the potential difference value at the position where the two curves deviate from the maximum;
s6, disassembling the three-electrode battery to obtain the polarization potential and the charge-discharge multiplying power at the beginning of lithium precipitation.
Each step is specifically described for more detailed understanding of the scheme in this embodiment.
S1, manufacturing a button cell comprising a positive pole piece and a lithium piece, a button cell comprising a negative pole piece and a lithium piece and a button cell comprising a positive pole piece and a negative pole piece.
And taking a part of the rolled positive electrode plate and negative electrode plate as the positive electrode plate and negative electrode plate for manufacturing the button cell, and wiping the positive electrode plate and the negative electrode plate of the button cell by adopting a reagent on one side before manufacturing.
Specifically, the positive electrode plate and the negative electrode plate of the fabricated rechargeable battery are tested, the thicknesses of the positive electrode plate and the negative electrode plate are required to be 123+/-2 mu m, the rebound thickness of 24 hours is required to be 130 mu m, the test resistivity and the peeling strength are not abnormal, the positive electrode plate and the negative electrode plate are subjected to single-sided wiping, wherein the positive electrode plate is wiped by adopting a reagent NMP, the negative electrode plate is wiped by adopting reagent alcohol, and the NMP is N-methylpyrrolidone. In the operation process, the periphery of the pole piece is sealed by using an adhesive tape to prevent the reagent from penetrating into the other surface of the pole piece, and the positive and negative pole pieces after wiping are respectively assembled with the lithium piece to form the power-saving battery.
S2, charging and discharging the electric buckling battery with a set multiplying power to obtain a standard charging and discharging potential curve of the positive electrode and the negative electrode of the electric buckling battery. Wherein the set magnification is 0.1C or less.
And (2) determining the charge and discharge current of the power-saving battery according to the parameters of the power-saving battery, namely determining the vertical of the set multiplying power in the step (S2). The parameters of the power button cell in this embodiment are specifically: the weight of the positive pole piece and the negative pole piece for manufacturing the button cell is 53g/m, and the surface density of the foil is 53g/m 2 Positive and negative active materialThe ratio was 96.8% and 96.5%, the gram capacity of the positive electrode was 145mAh/g, and the gram capacity of the negative electrode was 350mAh/g. Determining the charge and discharge current according to the obtained parameters, and performing a 0.1C (0.08 mA) charge and discharge test on the battery to obtain a standard charge potential curve of the positive electrode and the negative electrode, and charging the rechargeable battery with 0.1C multiplying power as shown in figure 1, wherein the curve (1) is the full battery potential trend of the battery, and the full battery is the rechargeable battery comprising a positive electrode plate and a negative electrode plate; the curve (2) is the potential trend of the positive electrode of the battery, and the battery is a button battery comprising a positive electrode plate and a lithium plate; the curve (3) is the potential trend of the negative electrode of the battery, and the battery is a button battery of a negative electrode plate and a lithium plate. In this embodiment, the SOC is calculated by calculating the potential trend using the remaining capacity ratio of the battery. In this embodiment, the small multiplying power (0.1C) of the battery is tested, the battery is used to eliminate the influence on the electrode, and the small multiplying power is used to further eliminate the polarization, so as to obtain the standard potential curve of the positive and negative electrodes, and the polarization potential of the positive and negative electrodes of the three-electrode battery can be clearly obtained by comparing with the test result of the three-electrode battery.
S3, manufacturing a coiled core battery, and arranging a reference electrode on the coiled core battery to obtain the three-electrode battery.
And (2) winding the rolled positive electrode plate and negative electrode plate in the step (S1) to form a coiled core battery, and connecting the coiled core battery with a copper wire, wherein one end led out of the copper wire is used as a reference electrode to form a three-electrode battery.
The surface oxide layer of the adopted copper wire needs to be removed firstly, the copper wire comprises a connecting end and a free end, the connecting end of the copper wire is connected with the battery, and the free end of the copper wire is led out from an explosion-proof valve of the battery to serve as a reference electrode. The connecting end of the copper wire is connected with the large surface of the battery winding core, a diaphragm is arranged at the copper wire, and the free end of the copper wire is led out from the explosion-proof valve of the battery and then fixed on the cover plate.
The process of specifically manufacturing the three-electrode battery is that the last fold of the rolled core battery is disassembled, the copper wire with the oxide layer removed is arranged at the large surface of the electrode sheet of the battery, and a diaphragm with a certain area is fixed at the copper wire, so that the copper wire is prevented from being in direct contact with the anode and the cathode.
After the copper wire is arranged, the pole piece of the winding core is reduced, the other end of the copper wire is fixed on the winding core by using an adhesive tape, and the winding core is subjected to the procedures of hot pressing, assembly and the like. And after the cover plate is welded, the free end of the copper wire is taken down, the copper wire is led out from the explosion-proof valve and fixed on the cover plate, the cover plate is put into an assembly line for laser welding, the battery core is taken down after the laser welding is finished, the hole at the explosion-proof valve is sealed by glue, and after the glue is completely solidified, the battery is subjected to subsequent baking, liquid injection, formation and capacity division procedures. After being led out, the copper wire is fixed on the cover plate, so that the copper wire can be prevented from being melted when the follow-up battery cell is subjected to laser welding.
After the three-electrode battery is divided into components, selecting a battery with qualified capacity and internal resistance to plate lithium on the copper wire, setting a lithium plating current of 0.02mA for forward and reverse plating, and selecting a smaller lithium plating current to ensure the uniformity of lithium plating.
And S4, setting different multiplying powers, and carrying out charge and discharge tests of the three-electrode battery at the different multiplying powers to obtain charge and discharge potential curves of the positive electrode and the negative electrode of the three-electrode battery under each multiplying power.
The method for setting the different multiplying powers is that the numerical values of the different multiplying powers are taken at about 1C, and the numerical values of the different multiplying powers are gradually increased from small to large.
The method for carrying out charge and discharge tests on the three-electrode battery with different multiplying powers and obtaining charge and discharge potential curves of the positive electrode and the negative electrode of the three-electrode battery under each multiplying power comprises the steps of connecting three voltage channels of a positive electrode-reference electrode, a negative electrode-reference electrode and a positive electrode-negative electrode of the three-electrode battery by adopting a multichannel instrument, observing whether three potentials are normal or not, connecting an electric performance test cabinet with the positive electrode and the negative electrode of the three-electrode battery, and starting the charge and discharge tests with different multiplying powers after the time interval between the multichannel instrument and the collection of the electric performance test cabinet is consistent after the wiring is completely finished.
In this embodiment, five three-electrode batteries were fabricated, and the five three-electrode batteries were respectively subjected to charge and discharge tests at rates of 0.7C, 0.8C, 0.9C, 1C, and 1.1C, and charge and discharge potential curves of the batteries at different rates were recorded. As shown in fig. 2, a potential trend curve (4) of the charge and discharge of the negative electrode of the three-electrode battery at 0.9C magnification was obtained.
And S5, comparing the charge and discharge potential curve of the positive electrode and the negative electrode of the three-electrode battery under each multiplying power with the standard charge and discharge potential curve, and calculating the polarization potential of the three-electrode battery under each multiplying power through the potential difference value at the position where the two curves deviate from the maximum.
And comparing the potential curve between the positive electrode and the negative electrode of the three-electrode battery under different multiplying powers with a standard charge-discharge potential curve, and judging the polarization potential under different multiplying powers. In particular, in the method for determining the polarization potential under different multiplying powers in this embodiment, as shown in fig. 2, a curve (4) of the potential trend of the negative electrode of the three-electrode battery under the multiplying power of 0.9C is obtained, the curve (4) is compared with the curve (3) of fig. 1, the negative electrode potential starts to rise after continuously falling near the end of charging, at the inflection point of the rising of the falling, the difference between the curve (4) and the curve (3) is the largest, the charging is performed under the multiplying power, at the lowest point of the curve, the potential difference between the negative electrode potential of the three-electrode battery and the maximum deviation of the two curves is the polarization potential of the three-electrode battery, and the difference between the actual potential of the negative electrode of the three-electrode battery and the actual potential of the standard battery at the lowest point is the polarization potential. For example, in the present embodiment, the difference between the actual potential of the negative electrode of the three-electrode battery and the actual potential of the standard battery at 0.9C magnification was measured at the inflection point in fig. 2 to be 0.12V.
Similarly, by adopting the same method, the negative electrode potential trend curves of the 0.7C, 0.8C, 1C and 1.1C under the charging test are compared with the curve (3), so as to obtain the polarization potentials of the batteries under different multiplying powers, wherein the specific table is as follows:
table 1 polarization potential meter of battery under different multiplying power
S6, disassembling the three-electrode battery to obtain the polarization potential and the charge-discharge multiplying power at the beginning of lithium precipitation.
In the step, the charge-discharge multiplying power at the beginning of lithium precipitation is the minimum multiplying power corresponding to the battery generating lithium precipitation in different multiplying powers in the step S4; the polarization potential at the beginning of lithium precipitation is the polarization potential corresponding to the minimum multiplying power.
For example, in this example, the batteries tested by charging at different rates were disassembled, and it was found that the batteries tested at 0.7C and 0.8C rates did not exhibit lithium precipitation, and the batteries tested at 0.9C, 1C, and 1.1C rates exhibited lithium precipitation. Therefore, lithium is generated at the interface of the charge with the rate of 0.9C or more, the polarization potential of the negative electrode lithium is 0.12V at the rate of 0.9C, and the polarization potential of the lithium precipitation window is determined to be 0.12V. When the battery is charged later, the charging policy is formulated, and the charging rate is required to be not more than 0.9C.
In this embodiment, by obtaining a standard charge-discharge potential curve of the positive electrode and the negative electrode, comparing a potential curve of a charge-discharge test of a three-electrode battery under different multiplying powers with the standard potential curve, judging polarization potentials under different multiplying powers, and then determining the minimum charge multiplying power causing lithium precipitation by disassembling the battery, obtaining a negative reference polarization potential with the minimum lithium precipitation, and judging whether a subsequent charge-discharge strategy causes lithium precipitation according to the potential. Compared with the common situation, the method for judging the lithium-ion potential by using the three-electrode battery test method usually only pays attention to the change of the negative reference potential, and the error of the method is larger. The lithium analysis judging method in the embodiment can more accurately react and can pre-judge the situation that lithium is analyzed from the battery under a certain multiplying power.
The invention and its embodiments have been described above by way of illustration and not limitation, and the invention is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention.
Claims (10)
1. A method for characterizing a lithium analysis window by using a battery polarization potential, which is characterized by comprising the following steps: comprises the steps of,
s1, manufacturing a button cell comprising a positive pole piece and a lithium piece, a button cell comprising a negative pole piece and a lithium piece and a button cell comprising a positive pole piece and a negative pole piece;
s2, charging and discharging the electric buckling battery with a set multiplying power to obtain a standard charging and discharging potential curve of the anode and the cathode of the electric buckling battery;
s3, manufacturing a coiled core battery, and arranging a reference electrode on the coiled core battery to obtain a three-electrode battery;
s4, setting different multiplying powers, and performing charge and discharge tests of the three-electrode battery at the different multiplying powers to obtain charge and discharge potential curves of the positive electrode and the negative electrode of the three-electrode battery under each multiplying power;
s5, comparing the charge-discharge potential curve of the positive electrode and the negative electrode of the three-electrode battery under each multiplying power with the standard charge-discharge potential curve, and calculating to obtain the polarization potential of the three-electrode battery under each multiplying power through the potential difference value at the position where the two curves deviate from the maximum;
s6, disassembling the three-electrode battery to obtain the polarization potential and the charge-discharge multiplying power at the beginning of lithium precipitation.
2. The method for characterizing a lithium analysis window using battery polarization potential according to claim 1, wherein: in step S1, the pole piece of the battery is manufactured in step S3.
3. The method for characterizing a lithium analysis window using battery polarization potential according to claim 1, wherein: in step S2, the set magnification is 0.1C or less.
4. A method of characterizing a lithium analysis window using battery polarization potential according to claim 2 or 3, wherein: in the step S3, a copper wire is connected with the coiled core battery, wherein one end led out of the copper wire is used as a reference electrode to form a three-electrode battery.
5. The method for characterizing a lithium analysis window using a battery polarization potential according to claim 4, wherein: in step S4, the method of setting the different magnifications is to take the values of the different magnifications around 1C.
6. The method for characterizing a lithium analysis window using a battery polarization potential according to claim 5, wherein: the different multiplying power values are gradually increased from small to large.
7. The method for characterizing a lithium analysis window using a battery polarization potential according to claim 5, wherein: in step S4, the method for performing charge and discharge tests with different multiplying powers on the three-electrode battery and obtaining charge and discharge potential curves of the positive electrode and the negative electrode of the three-electrode battery under each multiplying power is that a multichannel instrument is adopted to connect three voltage channels of the positive electrode-reference electrode, the negative electrode-reference electrode and the positive electrode-negative electrode of the three-electrode battery, and meanwhile, an electrical performance test cabinet is connected with the positive electrode and the negative electrode of the three-electrode battery to start charge and discharge tests with different multiplying powers.
8. The method for characterizing a lithium analysis window using a battery polarization potential according to claim 7, wherein: in step S6, the charge-discharge rate at the beginning of the lithium precipitation is the minimum rate corresponding to the battery generating the lithium precipitation in the different rates in step S4.
9. The method for characterizing a lithium analysis window using a battery polarization potential according to claim 8, wherein: and the polarization potential at the beginning of lithium precipitation is the polarization potential corresponding to the minimum multiplying power.
10. The method for characterizing a lithium analysis window using battery polarization potential according to claim 2, wherein: the positive pole piece and the negative pole piece of the button cell are firstly wiped by adopting a reagent before being manufactured.
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| CN202310863514.9A CN116840711A (en) | 2023-07-13 | 2023-07-13 | Method for representing lithium analysis window by using battery polarization potential |
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