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Pre-lithiation method for lithium metal negative electrode protection

A lithium metal negative electrode, metal lithium technology, applied in the direction of electrode manufacturing, battery electrodes, electrode current collector coating, etc., can solve the problems of electrolyte consumption, uneven deposition, dead lithium, etc., to suppress the generation of lithium dendrites Effect

Active Publication Date: 2019-04-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to its active chemical properties, metal lithium has the following problems in the use process: (1) metal lithium will deposit unevenly on the current collector during charging and discharging, resulting in lithium dendrite phenomenon, lithium dendrite The continuous growth of the battery may eventually pierce the battery diaphragm, causing a short circuit, and even cause the battery to explode and catch fire; (2) Metal lithium will react with the electrolyte during charging and discharging, on the one hand, the electrolyte will be continuously consumed, and on the other hand, it will Irreversible lithium deposition causes pulverization and dead lithium, resulting in greatly reduced cycle life

Method used

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  • Pre-lithiation method for lithium metal negative electrode protection
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  • Pre-lithiation method for lithium metal negative electrode protection

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preparation example Construction

[0032] The present invention can have the stable metal lithium negative electrode of protective film, and its preparation method generally comprises the following steps:

[0033] 1) Mix an organic polymer with good lithium ion transport properties and a binder to form a slurry and coat it on the current collector to prepare a pole piece containing an organic polymer;

[0034] 2) Assemble the pole piece made in step 1, metal lithium, and diaphragm into a battery, and add an appropriate electrolyte;

[0035] 3) Discharging the battery assembled in step 2, so that the metal lithium in the battery is evenly deposited on the current collector with the organic polymer;

[0036] 4) After discharging for a period of time, disassemble the battery in step 3, and take out the current collector containing organic polymer deposited with metallic lithium.

[0037]The surface that above-mentioned method obtains has the negative electrode of protective film, can be used for the assembly of f...

Embodiment 1

[0040] Vulcanized polyacrylonitrile, styrene-butadiene rubber, and carboxymethyl cellulose were uniformly mixed in a mass ratio of 90:5:5 with water as a solvent to form a slurry, which was coated on the current collector copper foil with a coating thickness of 10 μm. After the solvent evaporates, the copper foil is punched into a pole piece with a diameter of 16mm. Assemble the pole piece, diaphragm, and lithium metal into a button cell in an argon-protected glove box, and add 1,3-dioxygen at a concentration of 1M lithium bistrifluoromethanesulfonylimide and 1% mass concentration of lithium nitrate Pentacycline and ethylene glycol dimethyl ether (volume ratio 1:1) electrolyte.

[0041] The button cell assembled by the above method was charged at 1mA / cm 2 Discharge for 11 hours at a current density of 11 mAh / cm on the surface of the current collector 2 of lithium metal.

[0042] After the discharge is completed, the above-mentioned button battery is disassembled, and the cu...

Embodiment 2

[0046] The prepared slurry is composed of vulcanized polyacrylonitrile and polyvinylidene fluoride at a ratio of 90:10, and N-methylpyrrolidone is used as a solvent. All the other are identical with example 1.

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Abstract

The invention belongs to the field of lithium batteries, and discloses a pre-lithiation method for lithium metal negative electrode protection, which is characterized by comprising the steps of: (1) coating an organic polymer thin film on the surface of a current collector; (2) assembling the current collector coated with the organic polymer thin film, a lithium sheet, a diaphragm and an electrolyte into a battery to perform discharge treatment, and depositing metal lithium on the surface of the current collector; (3) and taking out the current collector on which the metal lithium is deposited, thereby acquiring a negative electrode material having a protective film on the surface and capable of being applied to a lithium metal battery. The metal lithium negative electrode prepared by adopting the pre-lithiation method disclosed by the invention can inhibit the generation of lithium dendrites, and on the other hand, the protective film formed in situ can prevent the lithium metal fromreacting with the electrolyte to produce fixed lithium, can effectively solve the phenomenon of lithium dendrites generated by uneven deposition of a conventional metal lithium negative electrode during the cycling process, and can effectively solve the phenomenon of reducing cycle performance due to the fixed lithium generated by the reaction of the lithium metal negative electrode with the electrolyte.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and more specifically relates to a pre-lithiation method for lithium metal negative electrode protection. Background technique [0002] With the continuous depletion of fossil energy and the environmental pollution it brings, the utilization of new energy occupies an increasing proportion in modern society. Among them, lithium battery is undoubtedly the most eye-catching new energy technology since the 21st century. Although the application of lithium-ion batteries has been seen everywhere in our lives, the lower capacity density of lithium-ion batteries limits its further development, so people are turning their attention to electrode materials with higher capacity density to meet the requirements of manufacturing high-ratio electrode materials. energy demand for advanced energy storage devices. Lithium metal is undoubtedly the most dazzling pearl among them. Lithium metal has a very high theo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/66H01M4/60H01M4/38H01M10/44
CPCH01M4/0404H01M4/382H01M4/602H01M4/667H01M10/44Y02E60/10
Inventor 谢佳姜智鹏金留孙玉龙曾子琪
Owner HUAZHONG UNIV OF SCI & TECH
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