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Preparation method of long-acting metal lithium reference electrode for lithium battery

A reference electrode and metal lithium technology, which is applied in the field of preparation of long-acting metal lithium reference electrodes, can solve the problems that the reference electrode cannot provide a stable reference potential, its own potential fluctuation, high reactivity, etc., and achieves inhibition of corrosion phenomenon, The effect of prolonging the service life and simple equipment

Active Publication Date: 2020-04-10
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, considering that in the actual battery, due to its inherent high reactivity, the unmodified and modified metal lithium will continuously react with lithium salts and solvents in the electrolyte to form SEI, resulting in fluctuations in its own potential, resulting in the loss of the reference electrode. Failure to provide a stable reference potential

Method used

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  • Preparation method of long-acting metal lithium reference electrode for lithium battery
  • Preparation method of long-acting metal lithium reference electrode for lithium battery

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Soak the original copper wire in a 1.0mol / L lithium hexafluorophosphate aqueous solution, take out the copper wire after 2 hours and dry it; place the dried copper wire in a solvent containing 1,3-dioxolane and dimethyl ether , in the electrolytic cell of lithium lithium salt of bistrifluoromethanesulfonimide, the current density of the control electroplating is 0.1mA cm -2 , Li deposition capacity is 0.1mAh cm -2 . After lithium plating is finished, clean the surface of lithium-plated copper wire with dimethyl ether pure solvent, soak it in fluoroethylene carbonate solvent for 5 hours after it is completely dry, then take it out and wait for the solvent to dry naturally to get the reference electrode .

Embodiment 2

[0026] Embodiment 2: Soak the original copper wire in the lithium perchlorate aqueous solution of 0.01mol / L, after 10h, the copper wire is taken out and dried; the dried copper wire is placed in fluoroethylene carbonate and diethyl carbonate As a solvent, lithium hexafluorophosphate is electroplated in an electrolyte system of lithium salt, and the current density is controlled at 5mA cm -2 , Li deposition capacity is 5mAh cm -2 . After lithium plating is finished, clean the surface of lithium-plated copper wire with diethyl carbonate pure solvent, and place it in N after it is completely dry. 2 Under the atmosphere, heat up and stand for 12h. Then the reference electrode can be obtained by taking out the lithium-coated copper wire.

Embodiment 3

[0027] Example 3: Soak the original copper wire in a 0.1mol / L lithium hexafluoroarsenate aqueous solution, take out the copper wire after 5 hours and dry it; place the dried copper wire in a mixture of 1,3-dioxolane and Dimethyl ether is used as a solvent, lithium bistrifluoromethanesulfonylimide is a lithium salt, and lithium nitrate is used as an additive for lithium plating in the electrolyte, and the lithium deposition current density is controlled to be 1.0mA cm -2 , with a capacity of 1.0mAh cm -2 . After lithium plating, clean the surface of lithium-plated copper wire with dimethyl ether pure solvent, soak it in the NMP solution of P4S16 for 1 hour after it is completely dry, and then take out the reference electrode after the solvent is naturally dried.

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Abstract

The invention belongs to the technical field of batteries, particularly to a preparation method of a long-acting metal lithium reference electrode for lithium ion and lithium metal batteries. The method comprises the following steps: soaking copper metal in an acid solution to remove a passivation layer on the surface of the copper metal; placing the copper metal without the passivation layer in an electrolytic tank to be electroplated with lithium metal; and coating the lithium-plated copper metal with an inorganic solid electrolyte layer through a physical or chemical pretreatment method. The reference electrode provided by the invention has good electrolyte corrosion resistance, can ensure long-time electrode potential stability, and provides a stable reference basis for monitoring potential changes of a positive electrode / a negative electrode respectively.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a preparation method of a long-term metallic lithium reference electrode for lithium ion and lithium metal batteries. Background technique [0002] A traditional lithium-ion battery usually consists of a positive electrode, a negative electrode, a separator, and an electrolyte. In the actual cycle work of the battery, the battery voltage, impedance, etc. are constantly changing with the depth of charge and discharge, and the accurate acquisition of effective information inside the battery is no matter for basic electrochemical research, such as the capacity decay mechanism of the positive and negative electrodes, and the phenomenon of lithium precipitation at the negative electrode. , It is also of great significance to the life and safety monitoring of electronic products. However, in the two-electrode system containing only positive and negative electrodes, the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30H01M4/13H01M4/139H01M10/0525
CPCG01N27/301H01M4/13H01M4/139H01M10/0525Y02E60/10
Inventor 张强许睿闫崇黄佳琦欧阳明高褚政宇
Owner TSINGHUA UNIV
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