阅读说明：本技术 一种可以观察电极横截面的电化学测试装置 (Can observe electrochemistry testing arrangement of electrode cross section ) 是由 曹鲁杰 其他发明人请求不公开姓名 于 2020-12-10 设计创作，主要内容包括：本发明专利公布了一种可以观察电极横截面的电化学测试装置,具有光学视窗,可对电池或超极电容器的电极横截面在电化学反应过程中直接进行光学测试(包括显微镜,共聚焦拉曼光谱,X射线衍射,同步辐射等),同时具有气体通道,用于对测试装置进行气密性检测,或用于对测试装置内部测试气氛的控制,具有电极支架可对电极材料进行固定,在原位光学测试中最大程度的保持电池的原始测试环境,适于对电极材料长期循环过程中产生的锂枝晶等现象进行原位观测,整个装置易于维护清理且安装拆卸方便,属于电池材料测试设备及研究领域。(The invention discloses an electrochemical testing device capable of observing the cross section of an electrode, which is provided with an optical window, can directly perform optical testing (comprising a microscope, confocal Raman spectroscopy, X-ray diffraction, synchronous radiation and the like) on the cross section of the electrode of a battery or an ultra-polar capacitor in the electrochemical reaction process, is also provided with a gas channel for performing air tightness detection on the testing device or controlling the testing atmosphere in the testing device, is provided with an electrode bracket capable of fixing an electrode material, maintains the original testing environment of the battery to the maximum extent in the in-situ optical testing, is suitable for performing in-situ observation on the phenomena of lithium dendrites and the like generated in the long-term circulation process of the electrode material, is easy to maintain and clean and convenient to install and disassemble, and belongs to the field of testing equipment and research of the battery material.)

1. An electrochemical test device capable of observing the cross section of an electrode, which is characterized in that: the device mainly comprises a base (01) and an upper cover (02) which form a main external frame of the device, the device is fixed by nuts, an opening is formed in the upper cover (02), light can pass through the opening, an electrode support sheet (03) is arranged inside the device, an electrode fixing nut (05), an O-shaped ring support (06) and a window (07), a plurality of interfaces are arranged on the base (01), two interfaces are used for placing an external electrode connecting probe (08), meanwhile, a through joint (09) can be installed on the other interface or two interfaces so as to facilitate the gas to enter and exit, all the components are sealed by a press fit joint and an O-shaped sealing ring, and an electrode installation support (10) is arranged for an electrode to be tested, the electrode support sheet (03), the electrode support sheet (04) and the electrode fixing nut (05) are installed.

2. An electrochemical test device capable of observing a cross section of an electrode according to claim 1, wherein: the electrode material to be tested and the diaphragm are placed between the electrode supporting sheets (04) in the device, the electrode supporting sheets (04) are beneficial to keeping the electrode material in the optimal state during testing, the electrode material to be tested and the electrode supporting sheets (04) are placed in the electrode bracket (03) to adjust the pressure between the electrodes through the electrode fixing nuts (05), and the transmission of ions between the electrode materials and the good contact between the electrode material and the electrode supporting sheets (04) are ensured.

3. An electrochemical test device capable of observing a cross section of an electrode according to claim 1, wherein: an O-shaped ring support (06) in the device is provided with an asymmetric structure at the upper part and the lower part, the lower part can assist the fixation of the electrode bracket (03), and meanwhile, the upper part protects a window (07) from being touched by the electrode bracket (03).

4. An electrochemical test device capable of observing a cross section of an electrode according to claim 1, wherein: one or two interfaces on a base (01) in the device can be provided with a through connector (09) which can be used for detecting the air tightness of the device, gas can be introduced in the testing process, so that the testing is carried out under a specific atmosphere, and the generated gas can be directly led out of the testing device for further testing.

5. An electrochemical test device capable of observing the cross section of an electrode according to claims 1 and 4, wherein: the base (01) in the device is provided with two interfaces for placing the external electrode connecting probe (08) besides the interface of claim 4, the placed external electrode connecting probe (08) seals the device in a pressing mode, and meanwhile, the head of the probe is in contact with the electrode fixing nut (05) and is connected with an electrode material through the electrode supporting sheet (04).

6. An electrochemical test device capable of observing a cross section of an electrode according to claim 1, wherein: the device is characterized in that an electrode support sheet (04) is arranged in an electrode support (03) to enable the side face of an electrode to be upward, a space between the electrode support sheets is a testing space, the testing space can be adjusted through an electrode fixing nut (05) according to the thickness of a tested sample, and meanwhile, the thickness of the electrode support sheet (04) can be changed to achieve the best electrochemical testing effect.

7. An electrochemical test device capable of observing a cross section of an electrode according to claim 1, wherein: the material of the window (07) in the device can be quartz, can be silicate glass or a polymer film, and can be changed according to the test requirement so as to adapt to different test requirements.

Technical Field

The invention relates to the field of equipment used for in-situ optical testing (including Raman spectroscopy, microscopic imaging, X-ray diffraction, synchronous radiation and the like) of cross sections of electrode materials of chargeable and dischargeable batteries (solid batteries, metal ion batteries, metal air batteries and the like), capacitors and other energy storage devices in an electrochemical process.

Background

One of the biggest challenges encountered in the popularization of electric vehicles at present is that the cruising ability of a battery mounted on the electric vehicle cannot be compared with that of a gasoline-diesel vehicle, and the improvement of the cruising ability of the battery is far from the simplicity of adding a plurality of battery modules in a vehicle body. Rechargeable batteries are also an important component in portable electronic devices. How to improve the capacity of the battery, how to prolong the service life of the battery, and how to enable the battery to have the capability of quick charge and quick discharge are all the problems concerned by the research field of the battery. The development of battery technology can not carry out systematic and comprehensive research on the physical structure, chemical composition, surface and interface of the electrode material in the electrochemical charging and discharging process by all in-situ test means. Various in-situ optical testing means are widely applied due to the popularization of microscopic imaging, Raman spectrometers, in-situ X-ray diffractometers and synchrotron radiation light sources in universities and scientific research institutions. In-situ optical testing of the cross section of the electrode material is a means for directly observing important problems related to the electrochemical performance of the battery, such as the generation of lithium dendrites, the diffusion speed of metal ions in electrode plates, the decomposition of electrolyte and the like. At present, only a few products of commercial in-situ test devices at home and abroad can directly observe the cross section of the electrode material, and the design needs to be further improved. In summary, the existing instrument for performing in-situ optical testing on the cross section of the electrode material is absent, so that an auxiliary device suitable for performing in-situ testing on the cross section of the electrode material of various energy storage devices is urgently needed, and the auxiliary device is helpful for researching the electrochemical performance of the energy storage devices and is suitable for people with different experience levels. The invention relates to a testing device which is simple, convenient and time-saving in an assembling process, low in technical requirements on operators, high in repeatability and free from influences on experiments due to short circuit, air leakage and the like. When the in-situ testing device is used, no additional training is required for the operator. The invention is beneficial to improving the accuracy of the test and is suitable for long-cycle tests.

Disclosure of Invention

In order to achieve the purpose, the invention adopts the technical scheme that: a device capable of being sealed is constructed, the cross section of an electrode can be observed through a window in the electrochemical reaction process, the device is formed by a base and an upper cover, a main external framework is fixed by a nut, the upper cover is provided with an opening through which light can pass, the inside of the upper cover passes through an electrode support, the electrode support sheet and the electrode fixing nut upwards fix the side surface of a tested electrode piece, the cross section is exposed under the window, the mobility of the electrode support is limited by the design of an O-shaped ring support, meanwhile, the O-shaped ring and the window are tightly combined to play a sealing role, the base is provided with a plurality of interfaces, wherein the two interfaces are used for placing an external electrode connecting probe to be connected with two electrode fixing nuts, one or two interfaces can be provided with a through joint to facilitate the gas to enter and exit, all the components are sealed by a press joint and an O-shaped sealing ring, the electrode bracket, the electrode supporting sheet and the electrode fixing nut are installed.

The electrode material to be tested and the diaphragm in the device are placed between the electrode supporting sheets, the electrode supporting sheets play a supporting role on the electrode material, the electrode material is kept in the best state during testing, the electrode material to be tested and the electrode supporting sheets can be fixed through the electrode fixing nuts after being placed in the electrode support, the pressure between the electrodes is adjusted, and the transmission of ions between the electrode materials and the good contact between the electrode material and the electrode supporting sheets are ensured.

The O-shaped ring support in the device can assist the electrode support to be fixed, meanwhile, the protection window is not touched by the electrode support, and the O-shaped ring support is vertically arranged to seal the upper cover and the base together.

The base in the device is provided with one or two interfaces which can be provided with the through connector, so that the air tightness of the device can be detected, gas can be introduced in the testing process, the testing is carried out under a specific atmosphere, and the generated gas can be directly led out of the testing device for further testing.

The base of the device is provided with two interfaces for placing the external electrode connecting probe, the placed external electrode connecting probe seals the device in a pressing mode, and meanwhile, the probe at the head of the device is contacted with the electrode fixing nut and is connected with the electrode material through the electrode supporting sheet.

The electrode support in the device is used for placing the electrode support sheets, the space between the electrode support sheets is a testing space, the testing space can be adjusted through the electrode fixing nut according to the thickness of a tested sample, and meanwhile, the thickness of the electrode support sheets can be changed to achieve the best electrochemical testing effect.

The material of the window in the device can be quartz, silicate glass or a polymer film, and can be changed according to the test requirement so as to adapt to different test requirements.

The invention has the advantages that the electrode material and the diaphragm can be well assembled together through the design of the electrode bracket, the electrode supporting sheet and the electrode fixing nut, and the cross section of the battery material can be observed in the electrochemical reaction process through the window. All parts are sealed through a pressed joint and an O-shaped sealing ring, so that conditions for long-cycle testing are provided; the sealed box body provides a controllable test atmosphere for in-situ optical test through the design of a reserved gas inlet and outlet; the distance between the window and the tested material can be adjusted to several micrometers, which is favorable for collecting optical signals to the maximum extent; the hidden electrode interface in the testing device is beneficial to reducing resistance, stabilizing electrochemical signals, improving the repeatability of test results and reducing the possibility of short circuit.

Drawings

The invention is further described with reference to the following figures and examples.

FIG. 1 is a schematic view of the assembly of the device according to the present patent;

FIG. 2 is a schematic view of an apparatus according to the present patent;

fig. 3 is an external view of an electrode mounting bracket according to the present invention.

In the figure, 01, a base, 02, an upper cover, 03, an electrode bracket, 04, an electrode supporting sheet, 05, an electrode fixing nut, 06, an O-shaped ring support, 07, a window, 08, an external electrode connecting probe, 09, a straight-through joint and 10, an electrode mounting bracket are arranged.

Detailed Description

[ example 1 ]

The device can perform in-situ optical test on the cross section of energy storage devices such as batteries and capacitors.

Fig. 1 is a schematic view of the assembled device, and fig. 2 is a schematic view of the assembled device. All parts should be dried before use and then transferred to and assembled in a glove box. Before assembly, the electrode support sheet (04), the electrode fixing nut (05) and the electrode material to be tested (shown in fig. 3) of the electrode support frame (03) are assembled by the aid of the electrode mounting support frame (10): the electrode support (03) is placed in the electrode mounting support (10) and fixed by nuts, then the electrode support sheets (04), the tested electrode material, the diaphragm and the electrolyte, the other electrode material and the other electrode support sheet (04) are placed in the electrode support (03) in sequence, and the distance between the two electrode support sheets (04) is adjusted by the two electrode fixing nuts (05). After the electrode support and the electrode material assembly are installed, the electrode support and the electrode material assembly are placed in a base (01) (shown in figure 1), two electrode fixing nuts (05) are respectively aligned to the direction of an external electrode connecting probe (08), an O-shaped ring support (with an O-shaped ring) (06), a window (07) and an upper cover (02) are sequentially placed on the electrode support and fixed through four nuts, then the two external electrode connecting probes (08) are installed, finally, the air tightness of the device is detected through a straight-through joint (09), after the detection is qualified, the straight-through joint (09) is changed into a plug (not shown in the figure) without an air hole, then the banana plug is connected with another banana plug through the external electrode connecting probe (08), and the banana plug is connected with an external electrochemical workstation and used for accurately controlling current and voltage and observing the electrode material through the window at any time.

[ example 2 ]

The device can perform in-situ optical test on the cross section of an energy storage device such as a battery and a capacitor and simultaneously control the atmosphere in the device.

The installation method was as described in example 1, but instead of replacing the through-connection (09), two through-connections (only one shown in the schematic, the other not shown) were used to facilitate the gas exchange and to regulate the atmosphere in the test chamber.

[ example 3 ]

The device can perform in-situ optical test on the cross section of an energy storage device such as a battery and a capacitor and analyze gas products generated in the device through an external test instrument.

The installation method was as described in example 1, but the through connection (09) was not replaced, and the generated gas was conducted out using a through connection and analyzed by an external test instrument.

[ example 4 ]

The device according to the invention can be used to observe the formation of lithium dendrites.

The mounting method was as described in example 1, and the electrode material and separator were replaced with lithium metal, a separator (a polymer sheet such as PEEK with an open center, PTFE, etc., not shown in the figure) and a current collector.