CN115061048A - Solid-state battery thermal runaway testing device and testing method - Google Patents
Solid-state battery thermal runaway testing device and testing method Download PDFInfo
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- 230000003287 optical effect Effects 0.000 claims abstract description 28
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- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- 239000011888 foil Substances 0.000 claims description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 10
- 229910052809 inorganic oxide Inorganic materials 0.000 claims description 4
- 229910052945 inorganic sulfide Inorganic materials 0.000 claims description 3
- 239000007773 negative electrode material Substances 0.000 claims description 3
- 239000007774 positive electrode material Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 49
- 229910052744 lithium Inorganic materials 0.000 abstract description 44
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 38
- 238000011065 in-situ storage Methods 0.000 abstract description 11
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- 238000006243 chemical reaction Methods 0.000 description 8
- 229910000664 lithium aluminum titanium phosphates (LATP) Inorganic materials 0.000 description 8
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- 229910009515 Li1.5Al0.5Ti1.5(PO4)3 Inorganic materials 0.000 description 1
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- 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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/48—Thermography; Techniques using wholly visual means
- G01J5/485—Temperature profile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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Abstract
The invention discloses a solid-state battery thermal runaway testing device, and belongs to the technical field of electrochemical testing. The solid-state battery thermal runaway testing device comprises a heating mechanism, an optical microscope, an infrared thermal imager, a testing platform for placing a sample to be tested and a control mechanism; the heating mechanism is a temperature-controlled heating platform, and the testing platform is arranged on the temperature-controlled heating platform; the optical microscope and the infrared thermal imager are respectively connected with the control mechanism and used for transmitting imaging information. The method combines an in-situ optical imaging technology and an infrared thermal imaging technology, combines a temperature control technology, synchronously tests the appearance of a sample, the evolution of an optical photo of the structural evolution of the sample and the evolution of a local temperature evolution curve and a temperature isopotential map of the sample in the thermal failure process, realizes the synchronous monitoring of the appearance, the structural evolution and the temperature evolution of the mesoscopic scale solid-state lithium battery thermal failure and runaway processes, and realizes the qualitative and quantitative correlation of the temperature and the structural evolution.
Description
Technical Field
The invention relates to the technical field of electrochemical testing, in particular to a solid-state battery thermal runaway testing device and a testing method combining in-situ optical imaging and infrared thermal imaging.
Background
Lithium ion batteries have the advantages of high voltage, high specific energy, good safety performance, etc., and have been widely used in portable electronic products and electric vehicles. The thermal safety is one of the key factors of the overall application of the lithium ion battery in the electric automobile, and the thermal runaway is the main reason of explosion and fire of the lithium ion battery. The solid-state lithium battery adopts the solid-state electrolyte to replace flammable and explosive liquid electrolyte, thereby effectively improving the thermal safety of the lithium battery. However, it was found that thermal runaway ignition occurred at 200 ℃ even after contacting a lithium negative electrode with an inorganic oxide solid electrolyte having extremely high thermal stability (chem. mater.2017,29, 8611-8619). Due to lack of intensive research, the thermal runaway mechanism of the all-solid-state lithium battery based on inorganic electrolyte is still not clear at present, and the design of the high-safety solid-state lithium battery is influenced. Therefore, the research on the thermal failure and the thermal runaway of the solid-state lithium battery is developed, and the understanding of the thermal failure and runaway mechanism of the solid-state battery has important significance for designing the solid-state battery with high thermal safety.
Currently, the main methods for testing thermal runaway are differential thermal analysis (adv. mater.2018,1803075), and accelerated calorimetric test (Joule 2020,4, 812-. The differential thermal analysis is mainly used for testing a small amount of electrode materials, and the condition of the interfacial reaction of the electrode and the solid electrolyte is difficult to study. The average temperature of the system is mainly measured by the accelerated calorimetry test, so that the monitoring of local temperature evolution caused by the interface reaction of the electrode and the electrolyte is difficult to realize, and the temperature difference of different areas in the thermal runaway process of the sample is difficult to monitor. In addition, the differential thermal analysis and the accelerated calorimetric test can only monitor the temperature change characteristics of the battery or the battery material and the component, and cannot monitor the microstructure change in the temperature change process on line. In-situ electron microscopy (i.e., electron microscopy) is used to monitor the morphology and crystal structure evolution history of electrode materials at different temperatures in real time (j.power Sources 2017,367,42-48), and is also commonly used to study the thermal stability of battery materials from microstructure scale tests. However, in situ electron microscopy studies can only study the thermal stability of materials and microscopic interfaces, and mesoscopic or macro-scale failures are difficult to achieve. Therefore, the development of the microscopic temperature change process capable of synchronously observing thermal failure and runaway of each component, an electrode/electrolyte interface and a model solid-state battery and the temperature difference with spatial resolution of the solid-state battery on the mesoscopic scale has important significance for designing the thermal safety strategy of the solid-state battery.
At present, in-situ optical microscope research devices and methods for solid-state batteries are mainly used for researching electrochemical failure in battery charging and discharging processes, for example, a patent with publication number CN 114024038A discloses an all-solid-state battery reaction chamber and method for in-situ optical microscope testing, and a patent with publication number CN 107706470 a discloses an in-situ optical observation solid-state battery interface testing device, which can observe the internal form and the interface evolution process of the solid-state battery charging and discharging processes, but because a coupling heating system and a thermal imaging system are not provided, the failure observation of the failure solid-state thermal runaway process and the temperature evolution of the failure process cannot be observed, and the quantitative and qualitative relationship between the structure evolution of the thermal runaway process and the temperature change is difficult to be realized. However, some current in-situ research devices for thermal runaway of batteries lack a component capable of synchronously observing the change of the micro-scale structure. For example, patent publication No. CN 108332860 a can only monitor temperature variation of a battery, and cannot perform imaging analysis on temperature differences in different areas with spatial resolution in microscopic variation processes of a thermal runaway battery runaway process, so that the essential cause of the temperature variation cannot be explored, and guidance cannot be provided for improving thermal stability of the battery according to a past thermal runaway accident of the battery.
Disclosure of Invention
In order to solve the technical problems, the invention provides a solid-state battery thermal runaway testing device and a testing method, which are used for accurately testing the sub-micron scale local temperature evolution and the different region temperature difference imaging conditions with high spatial resolution in the negative electrode/electrolyte thermal runaway process of a solid-state battery by combining an optical microscope and an infrared thermal imager and combining a temperature control heating platform, so that the synchronous monitoring of the in-situ optical imaging and the infrared thermal imaging of the thermal runaway of the solid-state battery is realized.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a solid-state battery thermal runaway testing device which comprises a heating mechanism, an optical microscope, an infrared thermal imager, a testing platform for placing a sample to be tested and a control mechanism, wherein the heating mechanism is used for heating the solid-state battery; the heating mechanism is a temperature-controlled heating platform, and the test platform is arranged on the temperature-controlled heating platform; the optical microscope and the infrared thermal imager are respectively connected with the control mechanism and used for transmitting imaging information.
Preferably, the surface of the temperature-controlled heating platform is covered with aluminum foil.
Preferably, the thickness of the aluminum foil is 0.1mm to 2 mm.
Preferably, the heating temperature of the temperature control heating platform is 100-1000 ℃.
Preferably, the test platform is made of stainless steel.
Preferably, a light source is also included.
Preferably, the control mechanism comprises a computer and a computer display.
In the technical scheme of the invention, the electrolyte of the solid-state battery is an inorganic oxide solid-state electrolyte or an inorganic sulfide solid-state electrolyte;
specifically, the inorganic oxide solid electrolyte may be exemplified by:
garnet-type oxide electrolyte: li 7 La 3 Zr 2 O 12 、Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 Etc.;
perovskite-type oxide electrolyte: li 3x La 2/3-x TiO 3 Etc.;
sodium super ionic conductor type oxide electrolyte: li 1+x Al x Ti 2-x (PO 4 ) 3 、Li 1+x Al x Ge 2-x (PO 4 ) 3 Etc.; specifically, the inorganic sulfide solid electrolyte may be exemplified by: a sulfide glass electrolyte; sulfide glass-ceramic electrolyte: 0.7Li 2 S-0.3P 2 S 5 、0.6Li 2 S-0.4SiS 2 Etc.; li 10 MP 2 S 12 Group sulfide electrolyte: m is Ge, Sn or Si; geranite type sulfide electrolyte Li 6 PS 5 X: x ═ Cl, Br, or I.
In some specific embodiments, the test platform is further provided with a negative electrode material layer, and the negative electrode material is a metallic lithium negative electrode, a silicon negative electrode, a graphite negative electrode, a lithium titanate negative electrode or a silicon carbon negative electrode.
In some specific embodiments, a positive electrode material layer is further disposed on the test platform, and the positive electrode material is a lithium iron phosphate positive electrode, a lithium cobaltate positive electrode, a ternary layered oxide positive electrode, a high-voltage spinel positive electrode (LiMn) 2 O 4 ) Or a lithium-rich manganese-based positive electrode.
In another aspect, the present invention provides a method for testing thermal runaway of a solid-state battery by using the testing device, including the following steps: the method comprises the steps of placing a sample to be tested on a testing platform, heating the sample to be tested through a temperature control heating platform, and within a given heating temperature range, obtaining optical imaging information and thermal imaging information of the sample to be tested through an optical microscope and an infrared thermal imager and conveying the optical imaging information and the thermal imaging information to a control mechanism.
The technical scheme has the following advantages or beneficial effects:
the invention provides a solid-state battery thermal runaway testing device and a testing method, which combine an in-situ optical imaging technology and an infrared thermal imaging technology and combine a temperature control technology to realize synchronous monitoring of a solid-state battery cathode/electrolyte interface, an anode/electrolyte interface, and structure evolution and local temperature evolution of a full battery during thermal failure under mesoscopic scale.
Compared with the prior art, the invention has the following advantages:
the method adopts the combination of an in-situ optical imaging technology and an infrared thermal imaging technology, and utilizes analysis software to superpose the morphological evolution and the temperature imaging graph to obtain the high-spatial-resolution temperature distribution imaging of the thermal runaway dynamic process of the sample to be detected, so that the morphological evolution process, the temperature distribution process and the evolution process of the thermal runaway and the fire of the sample to be detected can be monitored simultaneously, and the characteristics of the solid-state battery failure and the correlation between the morphological change and the temperature evolution and the temperature spatial distribution can be visually understood visually; the optical microscope can record micron-scale form and structure evolution imaging information of a sample to be measured in a heating process; the infrared thermal imager can synchronously monitor the highest temperature and the highest temperature position of a sample to be detected, simultaneously obtains temperature isopachstic image of the whole sample, has the characteristic of spatial resolution in temperature imaging, can monitor the local topography of different temperature areas, and has important significance for understanding a failure microscopic mechanism.
Drawings
The invention and its features, aspects and advantages will become more apparent from reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference symbols in the various drawings indicate like elements. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.
Fig. 1 is a schematic structural diagram of a solid-state battery thermal runaway testing device in embodiment 1 of the invention;
FIG. 2 is a diagram showing the evolution of the morphology structure of the thermal runaway process of the solid electrolyte and lithium metal cathode interface in example 2 of the present invention;
fig. 3 is a graph showing the variation process of the maximum temperature measured by the infrared thermography during the thermal runaway process of the solid electrolyte and metal lithium cathode interface in example 2 of the present invention;
fig. 4 is a temperature contour map and a maximum temperature position map change process measured by an infrared thermal imager in a thermal runaway process of a solid electrolyte and metal lithium cathode interface in example 2 of the present invention.
FIG. 5 is a diagram showing the evolution of the morphology structure of the solid electrolyte and lithium metal cathode interface thermal reaction process in example 4 of the present invention;
fig. 6 is a diagram showing the morphology structure evolution of the model full-cell thermal reaction process in example 5 of the present invention.
Wherein, 1 is an optical microscope, 2 is an infrared thermal imager, 3 is a temperature control heating platform, 4 is a test platform, 5 is a sample to be tested, 6 is a control mechanism, and 7 is a light source.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention are clearly and completely described with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the invention without inventive step, are within the scope of protection of the invention.
In the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, their indicated orientations or positional relationships are based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixed or detachable or integrally connected; they may be mechanically coupled, directly coupled, indirectly coupled through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
as shown in fig. 1, the present embodiment provides a solid-state battery thermal runaway testing apparatus, which includes a heating mechanism, an optical microscope 1, an infrared thermal imager 2, a testing platform 4 for placing a sample 5 to be tested, and a control mechanism 6; the heating mechanism is a temperature-controlled heating platform 3, and the testing platform 4 is arranged on the temperature-controlled heating platform 3; the optical microscope 1 and the infrared thermal imager 2 are respectively connected with the control mechanism 6 and used for transmitting imaging information.
The solid-state battery thermal runaway testing device provided by the invention combines an infrared thermal imager and an optical microscope, transmits imaging information of the infrared thermal imager to a control mechanism, and the control mechanism analyzes and synchronously monitors the form evolution process, the temperature distribution and the evolution process of thermal runaway and fire of a sample to be tested.
Further, the surface of the temperature-controlled heating stage 3 is covered with aluminum foil. According to the technical scheme, a layer of aluminum foil is laid on the surface of the temperature-controlled heating platform and serves as a thermal imaging background, so that the thermal imaging precision can be improved. Further, the thickness of the aluminum foil is 0.1 mm-2 mm.
Further, the heating temperature of the temperature-controlled heating platform 3 is 100-1000 ℃. In the technical scheme of the invention, the heating temperature of the temperature-controlled heating platform is determined by the type of the sample to be measured.
Further, the test platform 4 is made of stainless steel. The test platform made of stainless steel can increase the heating uniformity of the sample to be tested, and further improves the temperature equalizing effect.
Further, the solid-state battery thermal runaway testing device also comprises a light source 7. In the technical scheme of the invention, the position of the light source has no specific requirement, and the optical microscope can image as long as the sample to be detected can be illuminated.
Further, the control mechanism 6 includes a computer and a computer display. In the technical scheme of the invention, the computer is used for displaying imaging information, the built-in analysis software of the computer can superpose the form evolution and the temperature imaging graph to obtain the high-spatial-resolution temperature distribution imaging of the thermal runaway dynamic process of the sample to be detected, the form evolution process, the temperature distribution and the evolution process of the thermal runaway and the fire of the sample to be detected can be monitored simultaneously, and the failure characteristics of the solid-state battery and the correlation between the form change and the temperature evolution can be visually understood visually.
Example 2:
this example uses the above-described device for Li 1.5 Al 0.5 Ti 1.5 (PO 4 ) 3 (LATP) solid electrolyte and metallic lithium negative electrode interfaceThe thermal runaway process of the surface is tested, and the specific process is as follows:
in a glove box, Li was pressed using a powder tablet press 1.5 Al 0.5 Ti 1.5 (PO 4 ) 3 (LATP) solid electrolyte powder is pressed into a tablet under a certain pressure; removing an oxide layer on the surface of the metal lithium sheet by using a surgical scraper; covering an aluminum foil on the surface of a temperature-controlled heating platform, then placing a stainless steel gasket (namely a stainless steel layer), a metal lithium sheet (0.5g namely a lithium metal layer) and an LATP solid electrolyte sheet (0.4g) on the temperature-controlled heating platform in sequence from bottom to top, placing the temperature-controlled heating platform in the visual field of an optical microscope and an infrared thermal imager, heating the temperature-controlled heating platform at a heating rate of 10 ℃/min, wherein the temperature range is 25-400 ℃, recording the morphological structure evolution process of thermal failure in the heating process of a lithium cathode/LATP solid electrolyte by using the optical microscope, and simultaneously recording the position and the temperature variation process of the highest temperature point in an infrared thermal imaging information system.
The results of the tests of this example are shown in fig. 2-4, and it can be seen from fig. 2 that the lithium negative electrode/LATP solid electrolyte undergoes volume expansion during heating to cause cracking of the electrolyte, while the intense exotherm causes ignition of the lithium negative electrode and the electrolyte; as can be seen from FIG. 3, during the failure of the lithium negative electrode/LATP electrolyte, a severe temperature rise stage occurs at the highest temperature, and the highest temperature can reach 1133.0 ℃; as can be seen from fig. 4, the temperature at the interface of the lithium metal negative electrode/LATP solid electrolyte is the highest, and as the reaction proceeds, the reaction interface moves, and the position of the highest temperature also moves.
Example 3:
this example uses the above-described device for Li 1.5 Al 0.5 Ge 1.5 P 3 O 12 The thermal runaway process of the interface of the (LAGP) solid electrolyte and the lithium metal negative electrode is tested, and the specific process is as follows:
in a glove box, Li was pressed using a powder tablet press 1.5 Al 0.5 Ge 1.5 P 3 O 12 (lag) solid electrolyte powder is pressed into a tablet under a certain pressure; removing an oxide layer on the surface of the metal lithium sheet by using a surgical scraper; coating aluminum foil on a temperature control heaterPlacing a stainless steel gasket, a metal lithium sheet (0.5g) and an LAGP solid electrolyte sheet (0.4g) on a temperature control heating platform from bottom to top on the surface of the thermal platform, and placing the temperature control heating platform in the visual field of an optical microscope and an infrared thermal imager, so that the temperature control heating platform is heated at a heating rate of 10 ℃/min, wherein the temperature range is 25-400 ℃; and recording the evolution process of the thermally failed morphological structure in the heating process of the lithium cathode/LATP solid electrolyte by using an optical microscope, and simultaneously recording the position of the highest temperature point in an infrared thermal imaging information recording system and the temperature change process.
Example 4:
this example utilized the above-described device to Li 0.33 La 0.57 TiO 3 (LLTO) the thermal runaway process of the interface between the solid electrolyte and the metallic lithium negative electrode was tested as follows:
in a glove box, Li was pressed using a powder tablet press 0.33 La 0.57 TiO 3 (LLTO) solid electrolyte powder is pressed into a sheet under a certain pressure; removing an oxide layer on the surface of the metal lithium sheet by using a surgical scraper; covering an aluminum foil on the surface of a temperature-controlled heating platform, then placing a stainless steel gasket, a metal lithium sheet (0.5g) and a LLTO solid electrolyte sheet (0.4g) on the temperature-controlled heating platform in the sequence from bottom to top, placing the temperature-controlled heating platform in the visual field of an optical microscope and an infrared thermal imager, heating the temperature-controlled heating platform at a heating rate of 10 ℃/min, wherein the temperature range is 25-400 ℃, recording the morphological structure evolution process of the lithium cathode/LLTO solid electrolyte in the heating process by using the optical microscope, and simultaneously recording the position of the highest temperature point and the temperature change process in an infrared thermal imaging information system.
The test result of this example is shown in fig. 5, and it can be seen from fig. 5 that a thermal runaway process does not occur in the heating process of the lithium negative electrode/LLTO solid electrolyte, and the volume expansion and cracks of the electrolyte sheet due to a violent reaction do not occur, which indicates that the LLTO solid electrolyte and the lithium negative electrode have better thermal stability.
Example 5:
in this embodiment, the pair of devices is made of lithium iron phosphate (LiFePO) 4 ) The thermal runaway process of the model full cell with the anode and the metal lithium as the cathode is tested, and the specific process is as follows:
in a glove box, lithium iron phosphate (LiFePO) was prepared using a powder tablet press 4 ) Pressing the positive electrode powder into a sheet under certain pressure; removing an oxide layer on the surface of the metal lithium sheet by using a surgical scraper; coating an aluminum foil on the surface of a temperature-controlled heating platform, and then sequentially arranging a stainless steel gasket, a metal lithium sheet (0.5g), a LAGP solid electrolyte sheet and LiFePO from bottom to top 4 Placing a positive plate (0.4g) on a temperature-controlled heating platform, and placing the temperature-controlled heating platform in the visual fields of an optical microscope and an infrared thermal imager, so that the temperature-controlled heating platform is heated at a heating rate of 10 ℃/min, wherein the temperature range is 25-400 ℃; recording of lithium negative electrode/LiFePO by optical microscopy 4 And the evolution process of the morphology structure in the heating process of the anode, and the position of the temperature peak and the temperature change process in the infrared thermal imaging information recording system.
The test results of this example are shown in FIG. 6. from FIG. 6, it can be seen that LiFePO is used 4 The model full cell which is a positive plate, takes metal lithium as a negative electrode and takes LAGP as solid electrolyte does not have a thermal runaway process in the heating process, and the electrolyte plate does not have volume expansion and cracks caused by violent reaction, so that LiFePO in the full cell 4 The positive electrode and the lithium negative electrode have better thermal stability with the electrolyte.
Example 6:
this example uses the above-described device for Li 6 PS 5 The thermal runaway process of the interface between the Cl (LPSCl) solid electrolyte and the lithium metal cathode is tested, and the specific process is as follows:
in a glove box, Li was pressed using a powder tablet press 6 PS 5 Cl (LPSCl) solid electrolyte powder is pressed into a sheet under certain pressure; removing an oxide layer on the surface of the metal lithium sheet by using a surgical scraper; covering the surface of a temperature-controlled heating platform with aluminum foil, placing a stainless steel gasket, a metal lithium sheet (0.5g) and an LPSCl solid electrolyte sheet (0.4g) on the temperature-controlled heating platform in the order from bottom to top, and placing the temperature-controlled heating platform on an optical microscope and an infrared thermal imagerIn the visual field, the temperature control heating platform is heated at the heating rate of 10 ℃/min, the temperature range is 25-400 ℃, an optical microscope is used for recording the morphological structure evolution process of thermal failure in the heating process of the lithium cathode/LPSCl solid electrolyte, and meanwhile, the position of the highest temperature point in the infrared thermal imaging information recording system and the temperature change process are recorded.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A solid-state battery thermal runaway testing device is characterized by comprising a heating mechanism, an optical microscope, an infrared thermal imager, a testing platform for placing a sample to be tested and a control mechanism; the heating mechanism is a temperature-controlled heating platform, and the test platform is arranged on the temperature-controlled heating platform; the optical microscope and the infrared thermal imager are respectively connected with the control mechanism and used for transmitting imaging information.
2. The solid-state battery thermal runaway testing device of claim 1, wherein the surface of the temperature controlled heating platform is covered with aluminum foil.
3. The solid-state battery thermal runaway testing device of claim 2, wherein the aluminum foil is 0.1mm to 2mm thick.
4. The solid-state battery thermal runaway testing device of claim 1, wherein the heating temperature of the temperature-controlled heating platform is 100-1000 ℃.
5. The solid-state battery thermal runaway testing device of claim 1, wherein the test platform is made of stainless steel.
6. The solid-state battery thermal runaway testing device of claim 1, further comprising a light source.
7. The solid-state battery thermal runaway testing device of claim 1, wherein the control mechanism comprises a computer and a computer display.
8. The solid-state battery thermal runaway testing device of claim 1, wherein the electrolyte of the solid-state battery is an inorganic oxide solid-state electrolyte or an inorganic sulfide solid-state electrolyte.
9. The solid-state battery thermal runaway testing device of claim 1, wherein a layer of negative electrode material or a layer of positive electrode material is further disposed on the testing platform.
10. The method for testing thermal runaway of a solid state battery by using the testing device as claimed in any one of claims 1 to 9, comprising the steps of: the method comprises the steps of placing a sample to be tested on a testing platform, heating the sample to be tested through a temperature control heating platform, and within a given heating temperature range, obtaining optical imaging information and thermal imaging information of the sample to be tested through an optical microscope and an infrared thermal imager and conveying the optical imaging information and the thermal imaging information to a control mechanism.
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