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Surface modification method of lithium metal battery negative electrode and lithium metal battery

A technology for lithium metal batteries and lithium metal negative electrodes, which is applied in battery electrodes, lithium storage batteries, secondary batteries, etc., can solve the problems of lithium dendrites and dead lithium, and achieve the purpose of suppressing the generation of lithium dendrites, improving cycle performance and safety performance, improved compatibility and interfacial stability effects

Pending Publication Date: 2019-11-12
HUNAN LIFANG NEW ENERGY SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the objectives of the present invention is to provide a method for surface modification of the negative electrode of lithium metal batteries in view of the problem that lithium metal batteries are prone to produce lithium dendrites or even "dead lithium" in the prior art

Method used

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Examples

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Embodiment 1

[0021] This embodiment provides a method for surface modification of the negative electrode of a lithium metal battery, which includes the following steps: first soak the lithium metal negative electrode in a mixed solution containing lithium salt, ether solvent and fluorinated solvent, then take it out and dry it, and then A protective layer containing lithium oxide and lithium fluoride is formed on the surface of the lithium metal negative electrode, and a surface-modified lithium metal negative electrode is obtained. Wherein, the lithium salt is lithium nitrate, and the concentration of the lithium salt is 3.5 mol / L. The soaking time is 4.5 hours, and the thickness of the protective layer is 80nm. Ether solvents include ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether, and fluorinated solvents include fluoroethylene carbonate, Trifluoroethyl carbonate and 1,1,2,2-tetrafluoroethyl 2,2...

Embodiment 2

[0023] This embodiment provides a method for surface modification of the negative electrode of a lithium metal battery, which includes the following steps: first soak the lithium metal negative electrode in a mixed solution containing lithium salt, ether solvent and fluorinated solvent, then take it out and dry it, and then A protective layer containing lithium oxide and lithium fluoride is formed on the surface of the lithium metal negative electrode, and a surface-modified lithium metal negative electrode is obtained. Wherein, the lithium salt is lithium nitrate and lithium bisfluorosulfonyl imide, and the concentration of the lithium salt is 2 mol / L. The soaking time is 6 hours, and the thickness of the protective layer is 70nm. Ether solvents include ethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether, and fluorinated solvents include fluoroethylene carbonate, methyl trifluoroethyl carbonate, and 1,1,2,2-tetrafluoro Ethyl 2,2,2-trifluoroethyl ether, the...

Embodiment 3

[0025] This embodiment provides a method for surface modification of the negative electrode of a lithium metal battery, which includes the following steps: first soak the lithium metal negative electrode in a mixed solution containing lithium salt, ether solvent and fluorinated solvent, then take it out and dry it, and then A protective layer containing lithium oxide and lithium fluoride is formed on the surface of the lithium metal negative electrode, and a surface-modified lithium metal negative electrode is obtained. Wherein, the lithium salt is lithium nitrate and lithium bistrifluoromethanesulfonimide, and the concentration of the lithium salt is 5 mol / L. The soaking time is 3 hours, and the thickness of the protective layer is 75nm. Ether solvents include diethylene glycol dimethyl ether and triethylene glycol dimethyl ether, fluorinated solvents include fluoroethylene carbonate, and the volume ratio of ether solvents to fluorinated solvents is 4:1.

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Abstract

The invention belongs to the technical field of lithium batteries, and particularly relates to a surface modification method of a lithium metal battery negative electrode and a lithium metal battery.The surface modification method comprises the following steps of immersing the lithium metal battery negative electrode in a mixed solution comprising a lithium salt, an ether solvent and a fluoride solvent, taking out and drying the lithium metal negative electrode, and forming a protection layer comprising a lithium oxide and lithium fluoride on a surface of the lithium metal negative electrodeto obtain the surface-modified lithium metal negative electrode. By pre-treatment of immersing the lithium metal negative electrode in a lithium salt solution, a compact inorganic substance SEI film protection layer comprising the lithium oxide and the lithium fluoride is formed on the surface of the lithium metal negative electrode in advance, an effect of modifying the surface of the lithium metal negative electrode is achieved, the compatibility and the interface stability between the lithium metal negative electrode and the electrolyte in the lithium metal battery are further improved, thelithium dendrites during the charge-discharge process is prevented, so that the cycle property and the safety of the lithium metal battery are improved. The invention also provides the lithium metalbattery.

Description

technical field [0001] The invention belongs to the technical field of lithium metal batteries, and in particular relates to a method for modifying the surface of a negative electrode of a lithium metal battery and the lithium metal battery. Background technique [0002] Lithium-ion batteries are widely used in various electronic devices and electric energy storage devices due to their high operating voltage, small self-discharge, no memory effect, and environmental friendliness. Especially for applications in mobile phones, as mobile phones become thinner and lighter, the energy density requirements of batteries are getting higher and higher. In order to increase the energy density of lithium-ion batteries, the key is to find high-capacity positive and negative active materials. [0003] The theoretical specific capacity of lithium metal negative electrode is 3860mAh / g, the voltage platform is -3.04V (vs standard hydrogen electrode), and it has excellent conductivity, whic...

Claims

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Application Information

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IPC IPC(8): H01M4/1395H01M4/62H01M10/42H01M10/052H01M10/0525
CPCH01M4/1395H01M4/628H01M10/4235H01M10/052H01M10/0525Y02E60/10
Inventor 徐雄文
Owner HUNAN LIFANG NEW ENERGY SCI & TECH
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