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Metal lithium anode material and preparation method thereof

A negative electrode material, metal lithium technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of reduced cycle life, electrolyte consumption, lithium deposition and pulverization, etc., to improve cycle performance and capacity retention rate, suppress The production of lithium dendrites and the effect of reducing lithium consumption

Active Publication Date: 2019-04-16
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Metal lithium anode material and preparation method thereof
  • Metal lithium anode material and preparation method thereof
  • Metal lithium anode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Mix carbonized polyacrylonitrile and polyvinylidene fluoride in a ratio of 90:10 and N-methylpyrrolidone as a solvent to make a slurry, and coat it on a lithium sheet with a coating thickness of 25 μm, such as figure 1 shown. After the solvent volatilized, the copper sheet, separator and metal lithium with a polymer protective film were assembled into a lithium-copper half-cell in an argon-protected glove box, and a concentration of 1M lithium bistrifluoromethanesulfonylimide and 1 1,3-dioxolane and ethylene glycol dimethyl ether (volume ratio of 1:1) electrolyte with % mass concentration of lithium nitrate.

[0047] As shown in the photos from the SEM, as figure 2 , the polymer is evenly distributed on the surface of lithium metal.

[0048] The button cell assembled above was tested for Coulombic efficiency, and the current density was 0.5mA / cm 2 ,Such as image 3 It is a cycle comparison diagram of the coulombic efficiency of the common untreated lithium negative...

Embodiment 2

[0050] 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.

Embodiment 3

[0052] The coating thickness of the slurry on the lithium sheet is 100 μm. All the other are identical with example 1.

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Abstract

The invention belongs to the field of lithium batteries and more particularly to a metal lithium anode material and a preparation method thereof. The lithium metal anode provided by the present invention is obtained by coating the surface of the metal lithium with an organic polymer material having a good lithium ion transport property so as to form a polymer protective film, wherein the organic polymer is a hetero atom-doped polyacrylonitrile-based polymer. The method is simple to operate, low in cost and suitable for mass production. The metal lithium anode prepared by the method can greatlyimprove the cycle performance and the energy density of the lithium metal secondary battery.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and more specifically relates to a metal lithium negative electrode material and a preparation method thereof. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/60H01M4/62H01M10/0525
CPCH01M4/602H01M4/622H01M4/623H01M10/0525Y02E60/10
Inventor 谢佳姜智鹏金留孙玉龙曾子琪
Owner HUAZHONG UNIV OF SCI & TECH
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