CN218601211U - Lithium cell normal position power electrochemical performance testing arrangement - Google Patents

Lithium cell normal position power electrochemical performance testing arrangement Download PDF

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CN218601211U
CN218601211U CN202222942435.0U CN202222942435U CN218601211U CN 218601211 U CN218601211 U CN 218601211U CN 202222942435 U CN202222942435 U CN 202222942435U CN 218601211 U CN218601211 U CN 218601211U
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electrode
electrochemical
electrochemical cell
cavity
performance testing
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谢科予
沈超
赵耀华
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Northwestern Polytechnical University
Shenzhen Institute of Northwestern Polytechnical University
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Northwestern Polytechnical University
Shenzhen Institute of Northwestern Polytechnical University
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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
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    • Y02E60/10—Energy storage using batteries

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Abstract

The utility model provides a lithium cell normal position power electrochemical performance testing arrangement belongs to battery capability test technical field, include: the electrochemical cell is characterized in that a cavity of the electrochemical cell is filled with electrolyte; the reference electrode is arranged on one side of the inner wall of the cavity of the electrochemical cell; the counter electrode is arranged on the other side of the inner wall of the cavity of the electrochemical cell; the electrode clamp is arranged on the bottom wall of the cavity of the electrochemical cell, and a working electrode is clamped on the electrode clamp; the external electrode is arranged on the outer wall of the electrochemical cell and is used for connecting an external electrochemical analysis device; the reference electrode, the counter electrode and the working electrode are all connected with an external electrode through leads. The utility model discloses can realize the normal position power electrochemical performance test to lithium battery electrode, obtain the dynamic mechanics response characteristic of electrode in electrochemical reaction in-process, study lithium battery electrode real-time change law under different operating modes.

Description

Lithium cell normal position power electrochemical performance testing arrangement
Technical Field
The utility model belongs to the technical field of the battery capability test, concretely relates to lithium cell normal position power electrochemical performance testing arrangement, concretely relates to carry out the testing arrangement of the synchronous normal position nanometer indentation test of electrochemistry test to lithium cell electrode.
Background
The lithium battery has the remarkable advantages of high energy density, good rate capability, long cycle life, strong environmental adaptability and the like, and is widely and deeply applied to various fields such as electronic products, electric tools, new energy automobiles and the like. The lithium battery is used as an energy storage and conversion integrated device and relates to the coupling influence of multiple factors such as a mechanical structure, an electrochemical reaction, temperature and the like, wherein in the charging and discharging process of the lithium battery, repeated expansion and contraction of an active material are caused by repeated de-intercalation of lithium ions, so that structural deformation of the active material and extrusion and stretching of adjacent components are caused, and further the mechanical property of a pole piece is changed in the electrochemical reaction process. And mechanical phenomena such as pole piece deformation and cracking often cause electrochemical reaction failure, so that the lithium battery operation fault is caused, and therefore, the characterization test of the mechanical properties of the lithium battery under different electrochemical conditions is facilitated, the failure mechanism of the lithium battery is further analyzed, and the lithium battery which is long-lasting and operates efficiently is constructed.
The electrochemical reaction of the lithium battery relates to the phenomena of SEI film formation, active substance denaturation and the like, and is particularly sensitive to moisture, oxygen concentration and the like in the environment, so that most in-situ lithium battery testing devices are sealing systems. However, most of the existing material mechanical property tests are open systems, and the tested material is required to have certain environmental adaptability. Therefore, most of the conventional lithium battery mechanical property test methods are characterized ex-situ, the lithium battery is disassembled after a certain degree of electrochemical reaction is carried out, and the mechanical property test is carried out after substances such as active materials and the like are reprocessed, so that the obtained rule is distorted to a certain degree.
SUMMERY OF THE UTILITY MODEL
In order to overcome the deficiencies in the prior art, the utility model provides a lithium cell normal position power electrochemical performance testing arrangement. The device can realize that the lithium battery electrode is synchronously subjected to in-situ mechanical property test under the condition that the lithium battery carries out different electrochemical reactions so as to obtain the force-electrochemical coupling rule of the lithium battery.
In order to achieve the above object, the present invention provides the following technical solutions:
a lithium battery in-situ force electrochemical performance testing device comprises:
the electrochemical cell is characterized in that a cavity of the electrochemical cell is filled with electrolyte;
the reference electrode is arranged on one side of the inner wall of the cavity of the electrochemical cell;
the counter electrode is arranged on the other side of the inner wall of the cavity of the electrochemical cell;
the electrode clamp is arranged on the bottom wall of the cavity of the electrochemical cell, and a working electrode is clamped on the electrode clamp;
the external electrode is arranged on the outer wall of the electrochemical cell and is used for being connected with an external electrochemical analysis device;
the reference electrode, the counter electrode and the working electrode are all connected with the external electrode through leads;
and during testing, the testing device is arranged below a pressure head of the nanoindentation tester.
Preferably, the electrode clamp comprises a conductive connecting piece arranged on the bottom wall of the cavity of the electrochemical cell and a fixing piece arranged on the conductive connecting piece, the working electrode is arranged on the conductive connecting piece and positioned inside the fixing piece, and the working electrode is connected with the external electrode through the conductive connecting piece.
Preferably, the fixing part comprises clamping plates arranged on the periphery of the conductive connecting part, and the clamping plates are connected with the conductive connecting part through return springs.
Preferably, the fixing piece material is an insulating material.
Preferably, the lead is buried within the cell body of the electrochemical cell.
Preferably, the material of the electrochemical cell is polytetrafluoroethylene.
Preferably, the electrolyte is lithium hexafluorophosphate.
The utility model provides a lithium cell normal position power electrochemical performance testing arrangement has following beneficial effect:
be different from the distortion characteristics of off-site test, the utility model discloses a reference electrode can realize working electrode's normal position chemical properties test simultaneously with the counter electrode, can realize the normal position power electrochemical properties test to working electrode through the nanometer indentation tester simultaneously, obtains the dynamic mechanics response characteristic of working electrode in electrochemical reaction process, and the real-time change law of research working electrode under different operating modes, the device can cooperate more sign means to carry out joint synchronization test simultaneously.
Drawings
In order to more clearly illustrate the embodiments of the present invention and the design thereof, the drawings required for the embodiments will be briefly described below. The drawings in the following description are only some embodiments of the invention, and it will be clear to a person skilled in the art that other drawings can be obtained on the basis of these drawings without inventive effort.
Fig. 1 is a front view of a lithium battery in-situ force electrochemical performance testing device according to embodiment 1 of the present invention;
fig. 2 is a top view of a lithium battery in-situ force electrochemical performance testing device according to embodiment 1 of the present invention;
fig. 3 is a flow chart of a method for testing in-situ electrochemical performance of a lithium battery provided by the present invention;
description of reference numerals: 1-an electrochemical cell, 2-a reference electrode, 3-a counter electrode, 4-a fixing piece, 5-a conductive connecting piece, 6-a lead, 7-an external electrode, 8-a working electrode, 9-a pressure head and 10-electrolyte.
Detailed Description
In order to make the technical solution of the present invention better understood and practical for those skilled in the art, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the technical solutions of the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. In the description of the present invention, unless otherwise specified, "a plurality" means two or more, and will not be described in detail herein.
Example 1
The utility model provides a lithium cell normal position power electrochemical performance testing arrangement specifically as shown in figure 1 and figure 2, including electrochemical cell 1, reference electrode 2, counter electrode 3, external electrode 7 and electrode anchor clamps.
Specifically, the cavity of the electrochemical cell 1 is filled with an electrolyte 10, and in this embodiment, the electrolyte 10 is lithium hexafluorophosphate. The reference electrode 2 is arranged on one side of the inner wall of the cavity of the electrochemical cell 1; the counter electrode 3 is arranged on the other side of the inner wall of the cavity of the electrochemical cell 1; the electrode clamp is arranged on the bottom wall of the cavity of the electrochemical cell 1, and a working electrode 8 is clamped on the electrode clamp; the external electrode 7 is arranged on the outer wall of the electrochemical cell 1 and is used for connecting an external electrochemical analysis device.
The voltage of the reference electrode 2, the control current of the counter electrode 3 and the working electrode 8 are all connected with an external electrode 7 through a lead 6 embedded in the electrochemical cell 1.
During testing, the testing device is arranged below a pressure head 9 of the nanoindentation tester.
Further, in this embodiment, the electrode holder includes a conductive connecting member 5 disposed on the bottom wall of the cavity of the electrochemical cell 1 and a fixing member 4 disposed on the conductive connecting member 5, the working electrode 8 is disposed on the conductive connecting member 5 and located inside the fixing member 4, and the working electrode 8 is connected to the external electrode 7 through the conductive connecting member 5.
Specifically, in the present embodiment, the fixing member 4 includes a clamping plate disposed around the conductive connecting member 5, and the clamping plate is connected to the conductive connecting member 5 through a return spring, and the fixing member 4 in the present embodiment is similar to a clip structure in the prior art.
Further, in this embodiment, the fixing member 4 is made of an insulating material to prevent contact with the device. The material of the cell 1 is teflon to avoid reaction with the electrolyte.
Based on the same inventive concept, the embodiment also provides a method for testing the in-situ mechanical and electrochemical performance of the lithium battery, in the embodiment, the working electrode 8 is a lithium cobaltate thin film electrode, and before testing, lithium cobaltate (LiCoO) is firstly carried out on an aluminum foil current collector 2 ) And performing magnetron sputtering deposition on the film to prepare a plurality of lithium cobaltate film electrodes in the same batch.
As shown in fig. 3, the test procedure includes the following steps:
step 1, loading the lithium cobaltate thin film electrode on a conductive connecting piece 5, clamping the lithium cobaltate thin film electrode through a fixing piece 4, and keeping one side of an aluminum foil current collector of the lithium cobaltate thin film electrode in close and stable contact with the conductive connecting piece 5.
Step 2, fixing the electrochemical cell 1 on an objective table of a nanoindentation tester,
step 3, connecting the external electrode 7 to an external electrochemical analysis device; the potential range was set to 2.0 to 3.7V, and charge and discharge cycles were performed at 1C, 2C and 5C rates until the cell capacity was reduced to 80% SOC.
Step 4, injecting electrolyte 10 (1M lithium hexafluorophosphate organic solvent) into the cavity of the electrochemical cell 1, wherein the lithium cobaltate film electrode, the reference electrode 2 and the counter electrode 3 are all positioned in the electrolyte 10;
step 5, marking the area to be tested of the lithium cobaltate thin film electrode through an optical mirror of the nano indentation tester, and ensuring that the intervals of all marked areas are proper and have no mutual influence;
step 6, based on the Oliver-Pharr method, pressing down a target area marked on the lithium cobaltate thin film electrode by using a pressing head 9 of a nano indentation tester and generating scratches;
and 7, sending the data acquired in the pressing process to a host of the nanoindentation tester for analysis by a Berkovich pressure head 9 of the nanoindentation tester to obtain the mechanical property of the lithium cobaltate film electrode in the electrochemical reaction process. Specifically, the mechanical properties of the lithium cobaltate thin film electrode are obtained by obtaining indentation geometric parameters and a load-displacement curve of the lithium cobaltate thin film electrode in the electrochemical reaction process and obtaining the mechanical properties of the lithium cobaltate thin film electrode through the indentation geometric parameters and the load-displacement curve.
The reference electrode 2 and the counter electrode 3 send the acquired data to an external electrochemical analysis device, the data are analyzed by the external electrochemical analysis device to obtain the electrochemical performance of the lithium cobaltate film electrode in the electrochemical reaction process, and then the dynamic mechanical response rule of the lithium cobaltate film electrode along with the electrochemical reaction is obtained.
And carrying out statistical analysis on the data of a plurality of samples in the same batch to obtain the force-electrochemical coupling rule of the lithium cobaltate film electrode in the set electrochemical reaction process.
Further, in the test of this embodiment, the electrochemical cell 1 and the nanoindentor were placed in a glove box filled with argon gas, and the oxygen concentration of water in the glove box was measuredLess than 0.1mg L -1 。
To sum up, the utility model discloses following advantage has:
1. be different from the distortion characteristics of non-normal position test, the utility model discloses a reference electrode can realize working electrode's normal position chemical properties test with the counter electrode simultaneously, can realize the normal position power electrochemical properties test to working electrode through passing through the nanoindentation tester simultaneously, obtains the dynamic mechanics response characteristic of working electrode in the electrochemical reaction in-process, the real-time change law of research working electrode under different operating modes.
2. The utility model discloses can study multiple lithium battery electrode kind, including diaphragm class, polishing combined electrode and metal forming etc. be applicable to the similar material of other batteries equally.
3. The utility model discloses constitute simple flexibility, the maintenance is easily changed to the subassembly, through the adjustment device configuration, can cooperate more sign means to carry out joint synchronization test.
The above embodiments are only preferred embodiments of the present invention, the scope of protection of the present invention is not limited thereto, and any person skilled in the art can obviously obtain simple changes or equivalent replacements of the technical solutions within the technical scope of the present invention.

Claims (7)

1. The utility model provides a lithium cell normal position power electrochemical performance testing arrangement which characterized in that includes:
the electrochemical cell comprises an electrochemical cell (1), wherein electrolyte (10) is injected into a cavity of the electrochemical cell (1);
the reference electrode (2) is arranged on one side of the inner wall of the cavity of the electrochemical cell (1);
the counter electrode (3) is arranged on the other side of the inner wall of the cavity of the electrochemical cell (1);
the electrode clamp is arranged on the bottom wall of the cavity of the electrochemical cell (1), and a working electrode (8) is clamped on the electrode clamp;
the external electrode (7) is arranged on the outer wall of the electrochemical cell (1) and is used for being connected with an external electrochemical analysis device;
the reference electrode (2), the counter electrode (3) and the working electrode (8) are all connected with the external electrode (7) through leads (6);
during testing, the testing device is arranged below a pressure head (9) of the nanoindentation tester.
2. The lithium battery in-situ mechanical electrochemical performance testing device as claimed in claim 1, wherein the electrode clamp comprises a conductive connecting member (5) arranged on the bottom wall of the cavity of the electrochemical cell (1) and a fixing member (4) arranged on the conductive connecting member (5), the working electrode (8) is arranged on the conductive connecting member (5) and located inside the fixing member (4), and the working electrode (8) is connected with the external electrode (7) through the conductive connecting member (5).
3. The lithium battery in-situ mechanical-electrochemical performance testing device as claimed in claim 2, wherein the fixing member (4) comprises a clamping plate arranged around the conductive connecting member (5), and the clamping plate is connected with the conductive connecting member (5) through a return spring.
4. The in-situ mechanical-electrochemical performance testing device for the lithium battery as claimed in claim 3, wherein the fixing member (4) is made of an insulating material.
5. The in-situ mechatronic performance testing device of a lithium battery as claimed in claim 1, characterized in that the lead (6) is embedded in the body of the electrochemical cell (1).
6. The in-situ mechatronic performance testing device of a lithium battery as claimed in claim 1, characterized in that the material of the electrochemical cell (1) is polytetrafluoroethylene.
7. The in-situ mechanochemical performance testing device for lithium batteries according to claim 1, wherein the electrolyte (10) is lithium hexafluorophosphate.
CN202222942435.0U 2022-11-05 2022-11-05 Lithium cell normal position power electrochemical performance testing arrangement Active CN218601211U (en)

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Application Number Priority Date Filing Date Title
CN202222942435.0U CN218601211U (en) 2022-11-05 2022-11-05 Lithium cell normal position power electrochemical performance testing arrangement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202222942435.0U CN218601211U (en) 2022-11-05 2022-11-05 Lithium cell normal position power electrochemical performance testing arrangement

Publications (1)

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CN218601211U true CN218601211U (en) 2023-03-10

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