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Negative electrode potential monitoring method based on reference electrode for lithium battery

A technology of reference electrode and battery negative electrode is applied in the field of negative electrode potential monitoring based on reference electrode for lithium battery, which can solve problems such as side reactions, hidden dangers, and hindering lithium ion transmission.

Pending Publication Date: 2022-04-19
北京昇科能源科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are still some problems with lithium-ion batteries at present: the charging safety of lithium-ion batteries, especially fast charging under high current conditions, still has potential safety hazards, resulting in limited application in safe fast charging
At present, the commonly used reference electrode is copper wire lithium-plated reference electrode, but the active material lithium loaded by copper wire lithium-plated reference electrode is relatively small, and metal lithium is easy to have side reactions with electrolyte during battery cycle, and plating The lithium layer is easy to fall off, resulting in a short life; some people use the method of aluminum foil to support lithium titanate to prepare a reference electrode for long-term monitoring of the negative electrode potential of the battery. Hinder the transmission of lithium ions and affect the electrochemical performance of the battery itself, especially when tested at a higher current, the impact on the battery will be more serious

Method used

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  • Negative electrode potential monitoring method based on reference electrode for lithium battery
  • Negative electrode potential monitoring method based on reference electrode for lithium battery

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preparation example Construction

[0031] The preparation method of the lithium battery reference electrode of the embodiment of the present invention comprises the following steps in sequence:

[0032] Firstly, after the surface treatment of the conductive carbon cloth substrate, the lithium-containing compound is mixed with a conductive agent, a binder, a solvent, etc. to prepare a slurry and coated on the conductive carbon cloth substrate, and then dried, cut Cut and connect with metal tabs to prepare a reference electrode. Then use a diaphragm to wrap the end coated with the active material, implant it between the positive electrode and the negative electrode of the battery, and activate the reference electrode after liquid injection and sealing. The potential difference between them, and then according to the known potential of the reference electrode itself, the potential of the negative electrode of the battery can be calculated to realize long-term monitoring of the potential of the negative electrode o...

specific Embodiment

[0040] The following is a specific example, and its preparation method includes:

[0041] 1. Put a conductive carbon cloth with a thickness of 50 μm and a porosity of 60% in a beaker filled with concentrated sulfuric acid for 10 minutes. After soaking, clean the residual sulfuric acid on the surface with deionized water, and then dry it. Drying, the drying temperature is 60°C, and the drying time is 12h.

[0042] 2. Add lithium titanate powder, conductive carbon black, and PVDF to the NMP solvent in a ratio of 6:3:1, and stir evenly in a homogenizer.

[0043] 3. The prepared slurry was coated on the conductive carbon cloth substrate, and then placed in an oven at 80° C. for drying for 24 hours. After drying, a conductive carbon cloth SEM with lithium titanate active material loaded on the surface was obtained.

[0044] 4. Cut the carbon cloth loaded with active material obtained by drying into a strip shape of 2 mm × 50 mm, and then connect the end of the uncoated active mat...

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Abstract

The invention discloses a negative electrode potential monitoring method based on a reference electrode for a lithium battery. The negative electrode potential monitoring method comprises the following steps: activating the reference electrode implanted into the lithium battery; in the cycle process of the battery, calculating the potential of the negative electrode of the battery according to the potential difference between the negative electrode of the battery and the lithium-containing compound with the known potential in the reference electrode; wherein the reference electrode is prepared by the following steps: carrying out surface treatment on a porous conductive carbon cloth substrate, coating a pre-prepared slurry containing a lithium-containing compound on the surface-treated porous conductive carbon cloth substrate, and carrying out drying treatment; the porous conductive carbon cloth coated with the lithium-containing compound is cut into a long strip shape, and one end of the long-strip-shaped porous conductive carbon cloth is connected with a metal tab to prepare the reference electrode. According to the invention, long-time monitoring of the cathode potential in the battery circulation process can be realized.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a negative electrode potential monitoring method based on a reference electrode for lithium batteries. Background technique [0002] Lithium-ion batteries have been widely used in people's production and life due to their high energy density and long service life. Especially with the development and rise of new energy vehicles, as the main power source of new energy vehicles, the practicability and safety of lithium-ion batteries have attracted more and more attention. [0003] However, there are still some problems with lithium-ion batteries at present: the charging safety of lithium-ion batteries, especially the fast charging under high current conditions, still has potential safety hazards, resulting in limited application in safe fast charging. With the popularization and development of new energy vehicles, the gap between new energy vehicles and ordinary fuel vehi...

Claims

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Application Information

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IPC IPC(8): H01M10/42H01M10/48H01M4/04H01M4/139H01M10/0525
CPCH01M10/4285H01M10/48H01M4/139H01M4/0404H01M4/0471H01M10/0525Y02E60/10
Inventor 王乐红
Owner 北京昇科能源科技有限责任公司