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Three-electrode lithium battery and preparation method thereof

A lithium battery and three-electrode technology, which is applied in the field of three-electrode lithium batteries and their preparation, can solve problems such as unfavorable lithium battery analysis and damage to the structure of battery bare cells, so as to facilitate testing and evaluation, prevent circuit breakage, and facilitate electrochemical performance Effect

Active Publication Date: 2022-03-18
ZHONGTIAN ENERGY STORAGE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current three-electrode lithium battery disassembles the bare cell and sets the reference electrode between the anode sheet and the cathode sheet of the bare cell, which will destroy the bare cell structure of the battery and is not conducive to the protection of the lithium battery. analyze

Method used

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  • Three-electrode lithium battery and preparation method thereof
  • Three-electrode lithium battery and preparation method thereof
  • Three-electrode lithium battery and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0037] see figure 1 and figure 2 , figure 1 It is a schematic structural diagram of a three-electrode lithium battery in Example 1 of the present invention, figure 2 It is a structural schematic diagram of the bare cell, the positive tab, the negative tab and the reference electrode of the three-electrode lithium battery in Example 1 of the present invention. The three-electrode lithium battery 1 includes a packaging bag 10 , a bare cell 20 , an electrolyte (not shown in the figure), a positive tab 30 , a negative tab 40 and a reference electrode 50 . In this embodiment, the packaging bag 10 is an aluminum-plastic film packaging bag, so the packaging bag 10 has better airtightness. The bare cell 20 and the electrolyte are packaged in the packaging bag 10 in a sealed manner. The positive pole tab 30 and the negative pole tab 40 are led out of the packaging bag 10 from the bare cell 20 . A first end of the reference electrode 50 is disposed on the bare cell 20 , and a sec...

Embodiment 2

[0047] A preparation method for a three-electrode lithium battery may comprise the following steps:

[0048] Step S11: preparing a reference electrode.

[0049] Described preparation reference electrode specifically can comprise:

[0050] a1: Wrap a layer of coating on the reference tab.

[0051] In this embodiment, the reference tab is made of copper material. In this embodiment, the wrapping layer is made of lithium material. In other implementations, the wrapping layer is made of a material that has approximately the same potential as lithium, for example, a lithium compound or the like. Therefore, the wrapping layer can eliminate the influence of the potential of the reference tab on the potential of the lithium sheet.

[0052] a2: The lithium sheet is fixedly connected to the bottom end of the reference lug covered with the wrapping layer.

[0053] In this embodiment, the lithium sheet is rectangular, and the size of the lithium sheet is 1 cm x 0.5 cm to 2 cm x 1 cm....

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Abstract

A three-electrode lithium battery, comprising a packaging bag, a bare cell, an electrolyte, a positive electrode tab, a negative electrode tab, and a reference electrode, the bare cell and the electrolyte are sealed in the packaging bag , the positive tab and the negative tab are drawn out of the packaging bag from the anode sheet of the bare cell and the cathode sheet of the bare cell respectively, and the reference electrode is fixedly arranged on the bare cell An anode sheet or a cathode sheet of the bare cell. The invention also provides a method for preparing a three-electrode lithium battery, which can prepare a three-electrode lithium battery without destroying the bare cell, and can prevent the circuit between the reference electrode and the working electrode due to the lack of electrolyte. The occurrence of an open circuit is beneficial to the test and evaluation of the electrochemical performance of the battery system.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a three-electrode lithium battery and a preparation method thereof. Background technique [0002] At present, the testing and evaluation of the electrochemical performance of the battery system is an important part of further improving the performance and technological transformation of lithium batteries. The test and evaluation of the electrochemical performance of the battery system is mainly based on the simulated battery with two electrodes, but due to the existence of polarization, the two electrodes often cannot accurately reflect the positive and negative potentials. Therefore, in order to accurately detect the potential of the positive and negative electrodes, a three-electrode system is generally used, and electrochemical tests such as charge-discharge curves and electrochemical impedance spectroscopy are performed through the three-electrode system. However, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/052H01M10/058H01M50/531H01M4/134H01M4/1395G01R31/385
CPCH01M10/0525H01M10/058H01M4/134H01M50/538G01R31/3865Y02E60/10Y02P70/50
Inventor 华桂祥陈文浩郑媛媛靳承铀缪永华薛驰
Owner ZHONGTIAN ENERGY STORAGE TECH