CN117491444A - Dynamics analysis detection method for high-power device - Google Patents
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- 238000004458 analytical method Methods 0.000 title claims abstract description 24
- 238000001514 detection method Methods 0.000 title claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 49
- 238000009792 diffusion process Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 28
- 150000002500 ions Chemical class 0.000 claims abstract description 27
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims abstract description 13
- 238000001453 impedance spectrum Methods 0.000 claims abstract description 10
- 238000004448 titration Methods 0.000 claims abstract description 8
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910001416 lithium ion Inorganic materials 0.000 claims abstract description 6
- 238000007600 charging Methods 0.000 claims description 12
- 239000011149 active material Substances 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 5
- 239000007772 electrode material Substances 0.000 claims description 4
- 239000003792 electrolyte Substances 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000013543 active substance Substances 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000007774 positive electrode material Substances 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000004088 simulation Methods 0.000 claims 1
- 230000004044 response Effects 0.000 abstract description 10
- 239000000178 monomer Substances 0.000 abstract description 2
- 238000000157 electrochemical-induced impedance spectroscopy Methods 0.000 description 25
- 230000008569 process Effects 0.000 description 7
- 238000007599 discharging Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000004146 energy storage Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 238000012512 characterization method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010277 constant-current charging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000009960 carding Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000003411 electrode reaction Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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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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Abstract
The invention discloses a dynamic analysis detection method for a high-power device, which is implemented by combining GITT and EIS. The method comprises the following steps: step 1, preparing a high-power device test sample; step 2, testing electrochemical data of ion diffusion coefficients of a sample by a constant current intermittent titration method GITT, collecting the electrochemical data, and drawing a lithium ion diffusion kinetics GITT curve at different temperatures; step 3, constructing an equivalent circuit of an electrochemical impedance spectrum EIS, and testing multi-dimensional EIS spectrograms at different temperatures and different lithium contents by using the electrochemical impedance spectrum EIS; and 4, analyzing and comparing the GITT curve with data in the multi-dimensional EIS spectrogram to obtain a dynamic analysis result of the test sample. The method is simple, does not need to be made into a batch of monomers, performs ion dynamics test through the GITT, performs electrochemical impedance calibration through the EIS, has short period, high efficiency and accurate result analysis, and can clearly comb high-frequency ions comprising impedance response capability of the hybrid capacitor.
Description
Technical Field
The invention relates to the technical field of electrochemistry, in particular to a dynamic analysis and detection method for a high-power device by combining GITT and EIS.
Background
At present, no detailed and comprehensive dynamic analysis and detection method exists for high-power energy storage devices such as a hybrid capacitor and a high-rate battery, and the high-power response can be particularly divided into the energy storage current charging and discharging capacity of the high-rate battery at the level of 10-30min and the buffering energy storage performance of the hybrid super capacitor at the level of seconds to minutes in the full life cycle. In practical application, along with the change of physical environment and aging mechanism in the life cycle of the device, the slave BMS power management system accurately grasps the requirement of the device and the integral change of the life cycle of the product, and a detection method is needed to rapidly and accurately perform performance characterization on the device under multiple working conditions and multiple scenes.
At present, mainstream working condition tests mainly adopt high-flux test calculation, and are performed under different working conditions, the actual period is long, the data are limited, and the knowledge of the dynamic influence factors of devices is not clear enough.
Therefore, providing a detection method for dynamic analysis of high-power devices is a problem to be solved in the present invention.
Disclosure of Invention
The invention provides a dynamic analysis detection method for a high-power device, which aims to solve the problems in the background technology.
In order to achieve the technical purpose, the invention mainly adopts the following technical scheme:
the invention discloses a detection method combining GITT (requiring Chinese explanation supplement) and EI (requiring Chinese explanation supplement), in particular to a dynamic analysis detection method combining GITT and EIS for high-power devices, which comprises the following steps:
step 1, preparing a high-power device test sample;
step 2, testing electrochemical data of ion diffusion coefficients of a sample by a constant current intermittent titration method GITT, collecting the electrochemical data, and drawing a lithium ion diffusion kinetics GITT curve at different temperatures;
step 3, constructing an equivalent circuit of an electrochemical impedance spectrum EIS, and testing multi-dimensional EIS spectrograms at different temperatures and different lithium contents by using the electrochemical impedance spectrum EIS;
and 4, analyzing and comparing the GITT curve with data in the multi-dimensional EIS spectrogram to obtain a dynamic analysis result of the test sample.
In the preferred embodiment of the present invention, in step 1, the high-power device is a hybrid supercapacitor or a high-rate battery, and the test sample is a full-cell system for one of the electrodes, wherein the full-cell system is made of active materials for the lithium half-cell or both positive and negative electrodes.
Further, when preparing the test sample, the preparation is carried out in a glove box in inert gas atmosphere, the preparation is carried out by using a conventional 2032 button cell, the water oxygen content is controlled to be 0.01ppm, the diaphragm adopts a conventional commercial PP/PE diaphragm, one electrode adopts a metal lithium sheet to prepare a simulated cell, the other electrode adopts a sample to be tested, or the anode and the cathode are all full cell systems of active materials.
In the preferred embodiment of the invention, in the step 2, when the GITT is tested by using the constant current intermittent titration method, the constant current charge or discharge is firstly carried out on the tested sample under the set current density, and then the tested sample is kept stand under the open circuit voltage, so that the system reaches the steady state balance.
Further, when the constant current charge is performed on the test sample at a set current density and the charging time is set to t, t is less than L 2 D, wherein L is the thickness of the electrode and D is the ion diffusion coefficient; and charging voltages E and t 1/2 And the two are in linear relation.
Further, the calculation formula of the ion diffusion coefficient D is as follows:
wherein the D is Li Is Li + Diffusion coefficient in cm 2 s －1 ，m B Is the mass of the active substance, and the unit is g; v (V) M Is the molar volume of the electrode material, and is expressed in cm 3 mol －1 ；M B Is the relative molecular mass of the positive electrode material, and the unit is g.mol －1 The method comprises the steps of carrying out a first treatment on the surface of the S is the effective surface area of the electrode in cm in contact with the electrolyte 2 。
In the preferred embodiment of the present invention, in step 3, the method for constructing the equivalent circuit includes:
resistance R to be associated with SEI film sei Capacitor C sei Parallel connection is carried out to form a parallel circuit I;
transfer of charge to resistor R ct In series with Warburg impedance W and then with double electric layer capacitor C dl Parallel connection is carried out to form a parallel circuit II;
and connecting the ohmic resistor with the first parallel circuit and the second parallel circuit in series to form an equivalent circuit.
In the preferred embodiment of the invention, when the GITT curve or the multi-dimensional EIS spectrogram under different temperature conditions is drawn, the temperature range is-20-40 ℃, and the GITT corresponds to the temperature during the EIS test.
In a preferred embodiment of the invention, the lithium content ranges from 0% to 100% when plotting multi-dimensional EIS spectra at different lithium contents.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the short-time high-frequency ion diffusion coefficient is represented according to the efficient and simple pulse charge and discharge of the GITT, the impedance analysis of the multi-mode capacitance internal resistance equivalent circuit of the EIS is adopted on the basis, and the dynamic factors can be analyzed according to the corresponding relations of temperature/SOC and the like under multiple working conditions and multiple conditions;
the method provided by the invention is simple, batch monomers are not required to be made, the GITT means can be used for carrying out ion dynamics test by adopting button cell sampling preparation, and the EIS can be used for carrying out electrochemical impedance calibration on the basis, so that the period is short, the efficiency is high, and the result analysis is accurate.
According to the invention, through setting the one-to-one corresponding temperature SOC (lithium content) relation between the GITT means and the EIS, the high-frequency ion including impedance response capability of the hybrid supercapacitor can be clearly combed from the characterization data result of the hybrid supercapacitor.
Drawings
FIG. 1 is an equivalent circuit diagram of an electrochemical system impedance EIS provided by the invention;
FIG. 2 is a graph of the lithium ion diffusion kinetics GITT at various temperatures;
FIG. 3 is a multi-dimensional EIS spectrum of different temperatures and under different SOC conditions.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the attached drawings, so that the objects, features and advantages of the present invention will be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the invention, but rather are merely illustrative of the true spirit of the invention.
In the following description, for the purposes of explanation of various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that an embodiment may be practiced without one or more of the specific details. In other instances, well-known devices, structures, and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.
Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Example 1
A research method for dynamic analysis of a high-power device by combining GITT and EIS comprises the following steps:
and step 1, preparing a high-power device test sample.
In the invention, the high-power device is a hybrid super capacitor or a high-rate battery, and the test sample is a full-battery system which aims at one electrode and is made of active materials for a lithium half battery or positive and negative electrodes.
The high-power battery provided by the invention has a discharge multiple of 100 ℃, continuously discharges at 60 ℃, and has very wide application. The method is suitable for high-power unmanned aerial vehicles, aeromodelling, electric tools and the like.
The hybrid supercapacitor of the present invention is one supercapacitor with one electrode for storing and converting energy via electrochemical reaction and the other electrode for storing energy via double electric layers, and the supercapacitor is one new energy storing device between the conventional capacitor and the rechargeable battery and has fast charge and discharge characteristic and energy storing characteristic.
When the test sample is prepared, the test sample is prepared in a glove box in inert gas atmosphere, the test sample is prepared by a conventional 2032 button cell, the water and oxygen content is controlled to be 0.01ppm, a diaphragm adopts a conventional commercial PP/PE diaphragm, one electrode adopts a metal lithium sheet to prepare a simulated cell, the other electrode adopts a sample to be tested, or a full cell system with positive and negative electrodes both being active materials.
And 2, testing electrochemical data of ion diffusion coefficients of samples by a constant current intermittent titration method GITT, collecting the electrochemical data, and drawing a lithium ion diffusion kinetics GITT curve at different temperatures.
The GITT test consisted of a series of "pulse + constant current + relaxation". And applying absolute constant current to a system to be tested in a certain temperature environment, charging and discharging for a period of time, then closing the current, recording potential changes in the current applying process and the relaxation process which are key to a constant current intermittent titration technology, analyzing polarization information of electrode reaction by taking the current as raw data, and further estimating and calculating kinetic information of the reaction.
The GITT test requires simple equipment, and can effectively calculate the ion diffusion coefficient in the electrode material, thereby researching the ion migration of the electrochemical energy storage systemDynamic conditions. Two conditions need to be satisfied during the test: (1) The charging time t satisfies t < L 2 D, wherein L is the thickness of the electrode, D is the ion diffusion coefficient; (2) During charging, E (charging voltage) is equal to t 1/2 And (3) drawing, wherein the drawing is required to be in a linear relationship in the whole charging period.
The GITT can test the full factor ion diffusion coefficient of electrolyte/separator and the like including full cell in the test sample of step 1. And the test part adopts a Wuhan blue battery charging and discharging device to conduct constant current intermittent titration test. And (3) carrying out constant-current charging or discharging on the device for a time t under a certain current density, standing for 30min under an open-circuit voltage to ensure that the system reaches steady-state balance, and repeatedly carrying out a plurality of cycles on the steps within a voltage range to test the GITT curve of the device.
The basic principle of GITT is that the total transient potential Δet changes when a constant current I is applied for a unit time t, and the open circuit voltage changes after standing balance (Δes=es-E0) due to I application. In addition, there is a certain ohmic polarization potential drop and overpotential during a single calibration. In order to calculate the change relation of the current passing through the battery voltage (E) along with the time (t), the ion diffusion coefficient D is calculated according to the second law of FICK and the initial condition and boundary condition of ion diffusion.
The calculation is shown with reference to formula 1, wherein D Li Is Li + Diffusion coefficient in cm 2 s －1 Calculation referring to equation 1, m B Is the mass of the active substance, and the unit is g; v (V) M Is the molar volume of the electrode material, and is expressed in cm 3 mol －1 ；M B Is the relative molecular mass of the positive electrode material, and the unit is g.mol －1 The method comprises the steps of carrying out a first treatment on the surface of the S is the effective surface area of the electrode in cm in contact with the electrolyte 2 。
In the test process, the current I is used for constant current charging/discharging time t, the value of the device E changes to delta Et in the charging/discharging process, and then the open-circuit voltage OCV is kept still for 30min, so that the voltage is reduced to a new quasi-equilibrium potential(E s ). Total voltage change of the whole process is deltae s 。
And 3, constructing an equivalent circuit of the electrochemical impedance spectrum EIS, and testing multi-dimensional EIS spectrograms at different temperatures and different lithium contents by using the electrochemical impedance spectrum EIS.
Based on the ion diffusion coefficient tested by the GITT mode, the invention combines EIS electrochemical impedance spectroscopy to analyze different impedances of the capacitance, the internal resistance, the inductance and other parts, and comprehensively corresponds to different working conditions for carding. The basic principle of electrochemical impedance spectroscopy is to apply a sinusoidal electrical signal with an angular frequency to an unknown electrochemical system, and to know the frequency response of the system by the output response at the other end of the system. If the current signal is input, the voltage signal with the same frequency is output, the frequency response of the system is the impedance response of the electrochemical system, and when the frequency is continuously valued in a very wide range, the spectrogram formed by the obtained continuous frequency points is the electrochemical impedance spectrogram.
It should be noted that the input electrical signal is required to have a small amplitude, otherwise the accuracy of the measurement results is affected by changing the internal structure of the electrode system. The test method can comprehensively, clearly and nondestructively reflect the impedance characteristics of the electrochemical system and infer the internal structure and the current dynamic reaction.
The impedance response of the electrode process can be shown by electrochemical impedance spectroscopy, first requiring the determination of a system-like equivalent circuit. Equivalent circuits are formed by commonly used elements, such as resistors, capacitors and inductors, in series or parallel combinations, which are also referred to as equivalent elements.
As shown in FIG. 1, the present invention first creates an equivalent circuit by combining the resistance R associated with the SEI film sei Capacitor C sei Parallel connection is carried out to form a parallel circuit I; then the charge transfer resistor R ct In series with Warburg impedance W and then with double electric layer capacitor C dl Parallel connection is carried out to form a parallel circuit II; and finally, connecting the ohmic resistor with the first parallel circuit and the second parallel circuit in series to form an equivalent circuit.
The equivalent circuit can simulate the change process in an electrochemical system, and the impedance spectrum of the equivalent circuit is the same as the electrochemical impedance spectrum of the electrode, so that the impedance behavior of the equivalent circuit is similar to that of the electrode, and the dynamic problem that the inside is complicated and hard to characterize can be conveniently observed. Of course, due to the complexity of the electrode system, such equivalent circuits are only approximate representations of the electrode system and do not fully simulate accounting for the various changing characteristics within the system.
And 4, analyzing and comparing the GITT curve with data in the multi-dimensional EIS spectrogram to obtain a dynamic analysis result of the test sample.
Test examples
The test example combines the GITT and the EIS for data integration analysis, and provides a scheme for more optimizing and comprehensively analyzing electrochemical dynamics.
By adopting the method of the embodiment 1, firstly, the ion diffusion coefficient test of the lithium ion hybrid supercapacitor is carried out based on the GITT, the ion diffusion calibration of different SOCs is carried out at different temperatures (-20 ℃, 0 ℃, 25 ℃ and 40 ℃), and the different lithium contents (namely, the working conditions corresponding to different SOCs in a system) at the same temperature are measured. The results are shown in FIG. 2.
Then, after the ion diffusion coefficient test based on GITT, multi-dimensional EIS spectra of different temperatures (-20 ℃, 0 ℃, 25 ℃, 40 ℃) and different SOCs (0%, 10%, 30%, 50%, 70%, 90%, 100%) were measured according to the method of example 1, and the results are shown in fig. 3.
As can be seen from fig. 3, as the temperature changes, the higher the temperature, the faster the ion diffusion, which conforms to the ion diffusion motion mechanism; at the same time, the ion diffusion and response capability of low SOC is weakened and low at the same temperature, the phenomenon is obvious along with the temperature reduction difference, the SOC and the temperature under multiple conditions show the short-time high-frequency capability of a corresponding system, and the result has reference significance for the subsequent device working condition requirements.
The data are tested and analyzed at different temperatures and SOCs, wherein SOCs are different lithium contents of the system, the two data can be compared and analyzed according to temperature and SOC factors, dynamics in multiple dimensions are recognized more comprehensively and more carefully, and high-frequency ions comprising impedance response capability of the hybrid capacitor can be combed more clearly.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (10)
1. The dynamic analysis and detection method for the high-power device is characterized by comprising the following steps of:
step 1, preparing a high-power device test sample;
step 2, testing electrochemical data of ion diffusion coefficients of a sample by a constant current intermittent titration method GITT, collecting the electrochemical data, and drawing a lithium ion diffusion kinetics GITT curve at different temperatures;
step 3, constructing an equivalent circuit of an electrochemical impedance spectrum EIS, and testing multi-dimensional EIS spectrograms at different temperatures and different lithium contents by using the electrochemical impedance spectrum EIS;
and 4, analyzing and comparing the GITT curve with data in the multi-dimensional EIS spectrogram to obtain a dynamic analysis result of the test sample.
2. The method for dynamic analysis and detection of a high-power device according to claim 1, wherein in step 1, the high-power device is a hybrid supercapacitor or a high-rate battery, and the test sample is a full-battery system for one of electrodes, wherein the full-battery system is prepared by using a lithium half-battery or both positive and negative electrodes as active materials.
3. The method for dynamic analysis and detection of high-power devices according to claim 2, wherein the preparation of the test sample is performed in a glove box in inert gas atmosphere, the test sample is manufactured by a conventional 2032 button cell, the water and oxygen content is controlled to be 0.01ppm, the membrane is a conventional commercial PP/PE membrane, one electrode is a metal lithium sheet for manufacturing a simulation cell, the other electrode is a sample to be detected, or a full cell system with positive and negative electrodes both being active materials is adopted.
4. The method for detecting dynamic analysis of high-power devices according to claim 1, wherein in the step 2, when a GITT test sample is tested by a constant current intermittent titration method, the test sample is firstly subjected to constant current charge or discharge under a set current density, and then is kept stand under an open circuit voltage, so that a system reaches steady state balance.
5. The method for dynamic analysis and detection of high power device according to claim 4, wherein when the test sample is charged with constant current at a set current density and the charging time is set to be t, t < L ２ D, wherein L is the thickness of the electrode and D is the ion diffusion coefficient; and charging voltages E and t 1/2 And the two are in linear relation.
6. The method for dynamic analysis and detection of high power device according to claim 5, wherein the calculation formula of the ion diffusion coefficient D is:
；
wherein the D is Li Is Li + Diffusion coefficient in cm ２ s －1 ，m B Is the mass of the active substance, and the unit is g; v (V) M Is the molar volume of the electrode material, and is expressed in cm ３ mol －1 ；M B Is the relative molecular mass of the positive electrode material, and the unit is g.mol －1 The method comprises the steps of carrying out a first treatment on the surface of the S is the effective surface area of the electrode in cm in contact with the electrolyte 2 。
7. The method for dynamic analysis and detection of high-power devices according to claim 1, wherein in step 3, the method for constructing the equivalent circuit is as follows:
resistance R to be associated with SEI film sei Capacitor C sei Parallel connection is carried out to form a parallel circuit I;
transfer of charge to resistor R ct In series with Warburg impedance W and then with double electric layer capacitor C dl Parallel connection is carried out to form a parallel circuit II;
and connecting the ohmic resistor with the first parallel circuit and the second parallel circuit in series to form an equivalent circuit.
8. The method for dynamically analyzing and detecting the high-power device according to claim 1, wherein when a GITT curve or a multi-dimensional EIS spectrogram under different temperature conditions is drawn, the temperature range is-20-40 ℃, and the GITT corresponds to the temperature during the EIS test.
9. The method for dynamically analyzing and detecting the high-power device according to claim 1, wherein the lithium content ranges from 0% to 100% when the multi-dimensional EIS spectrograms are drawn under different lithium contents.
10. Use of the detection method according to any of claims 1-9 in high power device performance testing.
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