An in-situ charge-discharge sample holder for an X-ray three-dimensional microscope

Abstract

This application belongs to the field of in-situ charge-discharge testing technology, and relates to an in-situ charge-discharge sample rod for an X-ray three-dimensional microscope. The in-situ charge-discharge sample rod includes a sample cylinder, two electrode posts, two limiting nuts, and a fixed base for connection to the X-ray three-dimensional microscope. The sample cylinder has a support channel for accommodating the sample to be tested. The two electrode posts are inserted into the support channel from both ends. The opposing ends of the two electrode posts are radially confined within the support channel and simultaneously contact the sample to be tested. The opposing ends of the two electrode posts protrude from the support channel for connection to an electrochemical workstation. The two limiting nuts are detachably located at both ends of the support channel, locking the two electrode posts to the sample cylinder. The fixed base is located at the end of one of the electrode posts furthest from the sample cylinder, and a fixing element for fixing the electrode post is provided on the fixed base. The in-situ charge-discharge sample rod of this application can dynamically reflect the material changes of the sample to be tested and is easy to disassemble.

Description

Technical Field

[0001] This application belongs to the field of in-situ charge-discharge testing technology, and relates to an in-situ charge-discharge sample rod for an X-ray three-dimensional microscope. Background Technology

[0002] In the field of battery materials research, in-situ charge-discharge testing refers to the technology of simultaneously simulating battery charge-discharge conditions and detecting changes in the internal spatial structure of materials. Its core value lies in capturing the structural evolution of electrode materials in the electrochemical reaction process in real time, providing key data support for optimizing battery performance. Compared with traditional offline comparison tests before and after charge-discharge, in-situ charge-discharge testing can better reflect the authenticity and continuity of material changes.

[0003] Currently, X-ray three-dimensional microscopy is the mainstream equipment for characterizing the internal structure of battery materials, and its accompanying sample holder mainly serves the function of sample support. However, traditional sample holders are mostly simple clamp structures that can only fix the sample to be tested by clamping or bonding, and then rely on X-ray irradiation and detector detection to obtain the static internal structure of the material through software reconstruction. Under this design, traditional sample holders can usually only achieve static structural detection of the sample to be tested, and it is difficult to simulate the actual charge and discharge conditions of the battery, which cannot meet the requirements of in-situ charge and discharge testing, and urgently needs improvement. Utility Model Content

[0004] To address the deficiencies or improvement needs of existing technologies, this application provides an in-situ charge-discharge sample holder for an X-ray three-dimensional microscope. This in-situ charge-discharge sample holder can be used to simulate the actual charge-discharge conditions of a battery, meeting the requirements for in-situ charge-discharge testing.

[0005] This application provides an in-situ charge-discharge sample holder for an X-ray three-dimensional microscope, comprising a sample cylinder, two electrode posts, two limiting nuts, and a fixing base for connecting to the X-ray three-dimensional microscope, wherein: The sample cylinder is provided with a support channel for accommodating the sample to be tested. The two electrode posts are radially confined in the support channel at one end facing each other and simultaneously abut against the sample to be tested. The two electrode posts protrude out of the support channel at the other end to be connected to the electrochemical workstation. The two limiting nuts are detachably disposed at both ends of the support channel and lock the two electrode posts onto the sample cylinder; The fixing base is located at the end of one of the electrode posts away from the sample cylinder, and the fixing base is provided with a fixing component for fixing the electrode post.

[0006] As a further preferred embodiment, the sample tube is a cylindrical sleeve that is thinner in the middle and thicker at both ends, and the sample to be tested is positioned in the middle of the sample tube by the two electrode posts.

[0007] As a further preferred embodiment, both ends of the support channel are configured as stepped openings in the shape of enlarged holes, and the periphery of the electrode post is provided with a protruding structure, which can be positioned in contact with the inner wall surface of the stepped opening.

[0008] As a further preferred embodiment, the limiting nut is provided with a through hole, and the limiting nut is sleeved on the outer periphery of the electrode post based on the through hole, and the end of the limiting nut can be positioned in contact with the protruding structure of the electrode post.

[0009] As a further preferred embodiment, a sealing ring is provided between the surface of the electrode post and the inner wall of the support channel.

[0010] As a further preferred embodiment, the end face of the fixed base is provided with a positioning hole for inserting the electrode post; The fixing component includes a fixing bolt, which is threaded onto the periphery of the fixing base and can be spirally inserted into the positioning hole to abut against the fixing electrode post.

[0011] As a further preferred embodiment, the positioning hole is a stepped hole that can accommodate electrode posts of various diameters.

[0012] As a further preferred embodiment, the fixing base includes: a fixing structure for fixing the electrode post and a connecting structure for connecting to an X-ray three-dimensional microscope.

[0013] As a further preferred embodiment, the fixing structure and the connecting structure are detachably connected.

[0014] As a further preferred embodiment, the section of the electrode post protruding from the support channel is provided with a slotted structure, which is used to connect the wires extending from the electrochemical workstation.

[0015] In summary, compared with the prior art, the technical solutions conceived in this application have the following main technical advantages: 1. In the in-situ charge-discharge sample holder of this application, the sample to be tested is encapsulated within a sample cylinder by two electrode posts to avoid material changes that may occur during sample disassembly and assembly, thereby improving the accuracy and reliability of in-situ characterization. Simultaneously, the two electrode posts in the in-situ charge-discharge sample holder serve as positive and negative electrode interfaces to connect to an electrochemical workstation. By monitoring the current changes at the positive and negative electrodes, the operating conditions of a battery can be simulated, facilitating the study of electrode materials such as the sample to be tested. During actual testing, real-time changes in the internal structure of the sample can be detected while charging and discharging; comparative tests before and after charging can also be performed to reflect material changes.

[0016] 2. The in-situ charge-discharge sample rod of this application has an overall modular design, which can not only be used to place the sample to be tested, but also as a test device containing the sample to be tested. It can be easily installed in an X-ray three-dimensional microscope to intuitively and dynamically detect the material changes of the sample to be tested. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a relatively thin in-situ charge-discharge sample rod provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a relatively thick in-situ charge-discharge sample rod provided in an embodiment of this application; Figure 3 This is an exploded view of the in-situ charge-discharge sample rod provided in the embodiments of this application.

[0018] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1. Sample tube; 1-1. Support channel; 1-2. Stepped orifice; 2. Electrode post; 2-1. Raised structure; 2-2. Slotted structure; 3. Limiting nut; 3-1. Through hole; 4. Fixing base; 4-1. Fixing structure; 4-2. Connecting structure; 4-3. Positioning hole; 5. Sealing ring; 6. Fixing bolt; 10. Sample to be tested. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0020] The following is in conjunction with the appendix Figures 1-3 This application will be described in further detail.

[0021] This application discloses an in-situ charge-discharge sample holder for an X-ray three-dimensional microscope. (Refer to...) Figures 1-3 The in-situ charge-discharge sample rod includes a sample cylinder 1, two electrode posts 2, two limiting nuts 3, and a fixing base 4 for connection with an X-ray three-dimensional microscope. The sample cylinder 1 is provided with a support channel 1-1 for accommodating the sample 10 to be tested. After the two electrode posts 2 are inserted into the support channel 1-1 from both ends, the opposite ends of the two electrode posts 2 are radially limited in the support channel 1-1 and simultaneously abut against the sample 10 to be tested. The opposite ends of the two electrode posts 2 protrude from the support channel 1-1 for connection to an electrochemical workstation. The two limiting nuts 3 are detachably disposed at both ends of the support channel 1-1 and lock the two electrode posts 2 onto the sample cylinder 1. The fixing base 4 is located at the end of one of the electrode posts 2 away from the sample cylinder 1, and the fixing base 4 is provided with a fixing component for fixing the electrode post 2.

[0022] In this design, the in-situ charge-discharge sample rod can not only be used to hold the sample 10 to be tested, but also to use the electrode posts 2 as the positive and negative electrode interfaces of the sample 10. After the sample 10 to be tested is installed in the sample rod, the in-situ charge-discharge sample rod can be assembled in an X-ray three-dimensional microscope based on the fixed base 4. By connecting the two electrode posts 2 to an electrochemical workstation to form a current loop, the current changes of the positive and negative electrodes can be simulated through the electrochemical workstation to simulate the working conditions of a battery, so as to study the sample 10 (i.e., the electrode material). The X-ray three-dimensional microscope can be used to directly and dynamically detect the material changes of the sample 10 to be tested; of course, comparative experiments before and after charging can also be performed on the sample 10 to reflect the material changes of the sample 10, realizing the flexible and multi-purpose use of the in-situ charge-discharge sample rod.

[0023] Furthermore, such as Figure 3 As shown, in some embodiments, the sample cylinder 1 is a cylindrical sleeve that is thinner in the middle and thicker at both ends. The sample to be tested 10 is positioned in the middle of the sample cylinder 1 by the electrode post 2. With this design, the sample to be tested 10 is located in the thinner middle section of the sample cylinder 1, so that X-rays can pass through better. This makes the detection effect more accurate when the X-ray three-dimensional microscope detects the internal structural changes of the sample to be tested 10 (battery material) based on the thinner middle section of the sample cylinder 1.

[0024] Furthermore, such as Figure 3 As shown, in some embodiments, the openings at both ends of the support channel 1-1 are both set as stepped openings 1-2 in the shape of enlarged holes, and the periphery of the electrode post 2 is provided with a protruding structure 2-1, which can contact and limit the inner wall surface of the stepped opening 1-2.

[0025] Under this design, the protruding structure 2-1 forms a contact positioning with the inner wall surface of the stepped orifice 1-2, which can prevent the electrode post 2 from shifting within the support channel 1-1. This ensures that the sample 10 to be tested is always stably positioned by the two electrode posts 2 from both ends in the narrower section of the sample cylinder 1, avoiding the situation where the position of the sample 10 to be tested shifts and causes "target deviation from the field of view" during X-ray detection, thus effectively ensuring the positional accuracy of the detection image.

[0026] Furthermore, such as Figure 3 As shown, in some embodiments, the limiting nut 3 is provided with a through hole 3-1, and the limiting nut 3 is sleeved on the outer periphery of the electrode post 2 based on the through hole 3-1. The end of the limiting nut 3 can be positioned by contacting the protruding structure 2-1.

[0027] In this design, the limiting nut 3 screwed onto the sample cylinder 1 can apply a pre-tightening force to the protruding structure 2-1 to ensure good contact between the electrode post 2 and the sample 10 to be tested. By fine-tuning the axial installation position of the limiting nuts 3 at both ends of the sample cylinder 1, based on the axial limiting effect of the two limiting nuts 3 on the two electrode posts 2, fine-tuning the two limiting nuts 3 can, to a certain extent, achieve fine-tuning of the placement position of the sample 10 to be tested, so that the sample 10 to be tested can be accurately placed in the middle test area of ​​the sample cylinder 1.

[0028] Furthermore, in some embodiments, a sealing ring 5 is sandwiched between the electrode post 2 and the inner wall of the support channel 1-1. With this design, the sealing ring 5 improves the sealing effect between the electrode post 2 and the support channel 1-1, thereby maintaining a stable testing environment for the sample 10. Furthermore, to facilitate the installation of the sealing ring 5, an annular groove can be provided at the stepped surface of the stepped opening 1-2 in the support channel 1-1, or an annular groove can be provided on the outer circumferential surface of the electrode post 2, using the annular groove as the mounting base for the sealing ring 5.

[0029] like Figure 2 , Figure 3 As shown, in some specific embodiments, an annular groove is provided at the stepped surface of the stepped opening 1-2 at one end of the support channel 1-1. A sealing ring 5 is sandwiched between the end face of the electrode post 2 at this end and the support channel 1-1 at the annular groove, so that an end face seal is formed between the electrode post 2 and the support channel 1-1. Meanwhile, several annular grooves are provided on the outer circumferential surface of the electrode post 2 located at the other end of the support channel 1-1, and a sealing ring 5 is fitted at this annular groove, so that a circumferential seal is formed between the other electrode post 2 and the support channel 1-1.

[0030] Furthermore, in some embodiments, the end face of the fixed base 4 is provided with a positioning hole 4-3 for inserting the electrode post 2, and the periphery of the fixed base 4 is provided with a threaded hole communicating with the positioning hole 4-3. The fixing component includes a fixing bolt 6, which is threadedly connected to the periphery of the fixed base 4 along the threaded hole and can be screwed into the positioning hole 4-3 to abut against the fixed electrode post 2. That is, after the electrode post 2 is inserted into the positioning hole 4-3, the fixing bolt 6 is screwed on to secure the electrode post 2 against the positioning hole 4-3.

[0031] In this design, positioning holes 4-3 and fixing bolts 6 are provided on the fixed base 4, enabling rapid installation between the electrode post 2 and the fixing structure 4-1. Of course, in some other embodiments, the fixing component can also adopt other existing structures with fixing functions.

[0032] Furthermore, in some embodiments, the positioning holes 4-3 are stepped holes adapted to electrode posts 2 of various diameters (such as electrode posts 2 with a diameter of 10cm and electrode posts 2 with a diameter of 5cm). After the electrode post 2 is inserted into the corresponding step of the stepped hole, the fixing bolt 6 is screwed tightly along the threaded hole. The head of the fixing bolt 6 forms a tight lock against the electrode post 2, thus achieving quick installation between the electrode post 2 and the fixing base 4. Generally, the end of the fixing base 4 has multiple threaded holes circumferentially arranged, and correspondingly, multiple fixing bolts 6 are also provided, so that the installation stability of the electrode post 2 can be improved by the combined use of multiple fixing bolts 6.

[0033] Furthermore, in some embodiments, the fixing base 4 is designed as a split unit, comprising: a fixing structure 4-1 for fixing the electrode post and a connecting structure 4-2 for connecting with an X-ray three-dimensional microscope. The fixing structure 4-1 is provided with a positioning hole 4-3 and a threaded hole, and the fixing structure 4-1 and the connecting structure 4-2 are detachably connected.

[0034] Preferably, the fixing structure 4-1 and the connecting structure 4-2 are connected by threads. For example, the axial end of the fixing structure 4-1 is provided with a protruding threaded joint, and the end face of the connecting structure 4-2 is provided with a threaded groove that matches the threaded joint. The threaded connection between the threaded joint and the threaded groove enables quick installation between the fixing structure 4-1 and the connecting structure 4-2. The connecting structure 4-2 is provided with mounting holes, where operators can install bolts or other fasteners to stably install the connecting structure 4-2 onto the X-ray three-dimensional microscope.

[0035] In this design, the connection structure 4-2 is used in a universal way. Since the sample to be tested 10 is encapsulated in the sample cylinder 1 by the two electrode posts 2, when it is necessary to replace the sample to be tested 10, the sample cylinder 1 containing the next sample to be tested 10 can be assembled into the current connection structure 4-2 to quickly detect the next sample to be tested 10. This also means that the sample to be tested 10 does not need to be disassembled and removed from the sample cylinder 1 for replacement, which can avoid the material changes that may be caused by disassembling and installing the sample to be tested 10, and improve the accuracy and reliability of in-situ characterization.

[0036] Furthermore, in some other embodiments, the connecting base 4 adopts an integrated connection design. For example, the connecting base 4 has a threaded end, which is threadedly connected to a pre-set threaded hole on the X-ray three-dimensional microscope.

[0037] It can be understood that the main purpose of the mounting base 4 is to achieve stable installation of the in-situ charge-discharge sample rod on the X-ray three-dimensional microscope. In some embodiments, the in-situ charge-discharge sample rod is installed vertically on the X-ray three-dimensional microscope. In this scheme, the upper end of the mounting base 4 is fixed to one of the electrode posts 2, and the lower end of the mounting base 4 is connected to the X-ray three-dimensional microscope, which can basically ensure the stable connection between the in-situ charge-discharge sample rod and the X-ray three-dimensional microscope.

[0038] Furthermore, such as Figures 1-3 As shown, in some embodiments, the protruding support channel 1-1 section of the electrode post 2 is provided with a slot structure 2-2. The slot structure 2-2 is used to connect the wires extending from the electrochemical workstation. The slot structure 2-2 can be a perforation, countersunk hole, etc.

[0039] For example, in some specific implementations, the exposed section of the electrode post 2 used to connect with the fixed structure 4-1 is provided with a radially penetrating perforation; while the outer end face of the other electrode post 2 not connected with the fixed structure 4-1 is provided with a countersunk hole. Both the perforation and the countersunk hole are used to connect the wires extending from the electrochemical workstation. Generally speaking, one electrode post 2 (such as the electrode post 2 with the perforation) is used as the cathode post, and the other electrode post 2 is used as the anode post.

[0040] Generally, since the resolution of an X-ray microscope is directly proportional to its field of view, two types of in-situ charge-discharge sample rods can be used in in-situ charge-discharge tests, one of which is relatively thicker (e.g., ...). Figure 2 Another type of in-situ charge-discharge sample rod is relatively thinner (e.g. Figure 1 The two in-situ charge-discharge sample rods can use the same size connection structure 4-2. Two types of sample rods are designed: the thicker sample rod has a lower resolution in the final detection result, but better installation reliability and can support a larger current. The thinner sample rod has a higher resolution in the detection result, but the installation difficulty is higher than that of the thicker sample rod, and it can support a smaller current; the specific current depends on the material, which will not be elaborated here.

[0041] It should be noted that the in-situ charge-discharge sample holder designed in this way is particularly suitable for the Zeiss X-ray three-dimensional microscope. The following is a detailed introduction to the Zeiss X-ray three-dimensional microscope: The Zeiss X-ray 3D microscope boasts groundbreaking resolution and imaging capabilities, featuring submicron-level high resolution, a true spatial resolution of up to 500 nm, and a minimum voxel size of 40 nm. Its RaaD™ technology exhibits the following characteristics: maintaining 1.0 μm resolution even at large working distances (e.g., 50 mm), enabling direct, non-destructive scanning of samples with a diameter ≥25 mm; and providing high-resolution imaging of intact cells, large rocks, and other objects without the need for cutting.

[0042] Generally speaking, Zeiss X-ray 3D microscopes feature wide field of view and automatic stitching. In wide field mode (WFM), the lateral field of view reaches 50 mm under a 0.4× objective lens, supporting 3x volume expansion. They also feature vertical stitching technology, automatically reconstructing multi-scan data and eliminating the need for manual stitching.

[0043] Furthermore, the Zeiss X-ray 3D microscopes used typically feature high-performance hardware systems, including a sealed transmission X-ray source with a maximum voltage of 160 kV, power of 25 W, and a throughput 2.5 times higher than previous generations (120–160 kV range), significantly accelerating scanning speed. The activation time after the X-ray source is turned off is less than 5 minutes, supporting stable scanning for ≥24 hours. The Zeiss X-ray 3D microscopes feature a composite detector system, combining a CCD detector (2048×2048 pixels) with four objectives (including 0.4× and 40×), with the 40× objective having a resolution ≤0.5 μm. Additionally, the Zeiss X-ray 3D microscopes have a two-stage magnification architecture: geometric magnification + secondary magnification via optical objectives, breaking through the limitations of traditional single-stage CT.

[0044] The Zeiss X-ray 3D microscope features a flexible sample stage and protective shielding. Its quadriaxial sample stage has a load capacity of ≥25 kg and is suitable for samples with a diameter of 300 mm. It has a fully leaded steel enclosed shielded chamber, double-locked safety doors, and a leakage rate of <1 µSv / h.

[0045] The Zeiss X-ray 3D microscope features intelligent software and workflows, is compatible with in-situ devices such as tensile, compression, and hot stages, and is suitable for a wide range of industry applications, including pore structure and crack analysis in materials science, as well as battery research and complete cell aging monitoring. In the semiconductor field, it can virtually section 2.5D / 3D packages. In geology / life sciences, it is suitable for multi-scale imaging of rock cores and in-situ observation of plant roots.

[0046] This application provides an in-situ charge-discharge sample holder, which is particularly suitable for use on Zeiss X-ray three-dimensional microscopes. It is mainly used to mount batteries and, in conjunction with the equipment functions of the three-dimensional microscope, for in-situ charge-discharge testing of batteries.

[0047] It should be understood that expressions such as "comprising" and "may include" as used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as "comprising" and / or "having" may be interpreted as indicating a specific characteristic, number, operation, constituent element, component, or combination thereof, but should not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0048] It should be understood that the terms “center,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0050] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0051] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An in-situ charge-discharge sample holder for an X-ray three-dimensional microscope, characterized in that, It includes a sample tube (1), two electrode posts (2), two limiting nuts (3), and a mounting base (4) for connection with an X-ray three-dimensional microscope, wherein: The sample tube (1) is provided with a support channel (1-1) for accommodating the sample to be tested (10). The two electrode posts (2) are radially confined in the support channel (1-1) at one end facing each other, and simultaneously abut against the sample to be tested (10). The two electrode posts (2) protrude out of the support channel (1-1) at one end facing away from each other for connecting to an electrochemical workstation. The two limiting nuts (3) are detachably disposed at both ends of the support channel (1-1) and lock the two electrode posts (2) onto the sample cylinder (1); The fixing base (4) is located at one end of one of the electrode posts (2) away from the sample tube (1), and the fixing base (4) is provided with a fixing member for fixing the electrode post (2).

2. The in-situ charge-discharge sample rod as described in claim 1, characterized in that, The sample tube (1) is a cylindrical sleeve that is thin in the middle and thick at both ends. The sample to be tested (10) is positioned in the middle of the sample tube (1) by the two electrode posts (2).

3. The in-situ charge-discharge sample rod as described in claim 1, characterized in that, The two ends of the support channel (1-1) are both set as stepped openings (1-2) in the shape of enlarged holes. The electrode post (2) is provided with a protruding structure (2-1) on its periphery. The protruding structure (2-1) can be positioned in contact with the inner wall surface of the stepped opening (1-2).

4. The in-situ charge-discharge sample rod as described in claim 3, characterized in that, The limiting nut (3) is provided with a through hole (3-1). The limiting nut (3) is sleeved on the outer periphery of the electrode post (2) based on the through hole (3-1). The end of the limiting nut (3) can be positioned in contact with the protrusion structure (2-1) on the electrode post (2).

5. The in-situ charge-discharge sample rod as described in claim 1, characterized in that, A sealing ring (5) is sandwiched between the surface of the electrode post (2) and the inner wall of the support channel (1-1).

6. The in-situ charge-discharge sample rod as described in claim 1, characterized in that, The end face of the fixed base (4) is provided with a positioning hole (4-3) for inserting the electrode post (2); The fastener includes a fixing bolt (6), which is threaded onto the periphery of the fixing base (4) and can be screwed into the positioning hole (4-3) to fix the electrode post (2).

7. The in-situ charge-discharge sample rod as described in claim 6, characterized in that, The positioning hole (4-3) is a stepped hole that can accommodate electrode posts (2) of various diameters.

8. The in-situ charge-discharge sample rod as described in claim 1, characterized in that, The fixed base (4) includes: a fixing structure (4-1) for fixing the electrode post (2) and a connecting structure (4-2) for connecting with the X-ray three-dimensional microscope.

9. The in-situ charge-discharge sample rod as described in claim 8, characterized in that, The fixing structure (4-1) and the connecting structure (4-2) are detachably connected.

10. The in-situ charge-discharge sample rod according to any one of claims 1-9, characterized in that, The section of the electrode post (2) protruding from the support channel (1-1) is provided with a slot structure (2-2), which is used to connect the wires extending from the electrochemical workstation.

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