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Preparation and application of lithium metal negative electrode based on aromatized nitrate free radical modification

A lithium metal negative electrode and aromatization technology, which is applied in the preparation and application of lithium metal negative electrodes modified by aromatized nitric acid radicals, can solve the problems of lithium dendrite safety hazards and low Coulombic efficiency, and achieve excellent electrochemical performance. Effects of Coulombic efficiency and high ionic conductivity

Inactive Publication Date: 2021-09-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The invention aims at the potential safety hazards caused by the growth of lithium dendrites in the lithium metal negative electrode, the low Coulombic efficiency, etc., and provides a preparation and application of a lithium metal negative electrode based on aromatized nitric acid free radical modification

Method used

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  • Preparation and application of lithium metal negative electrode based on aromatized nitrate free radical modification
  • Preparation and application of lithium metal negative electrode based on aromatized nitrate free radical modification
  • Preparation and application of lithium metal negative electrode based on aromatized nitrate free radical modification

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Under the protection of argon gas, the compound (1) containing aromatized nitric acid radicals was dissolved in dimethyl sulfoxide (DMSO) to make a solution with a mass fraction of 0.1%, and 50 μL of the solution was taken with a pipette gun Drop vertically on the surface of the lithium metal negative electrode, and coat it evenly, and leave it at room temperature for 12 hours to obtain a lithium metal negative electrode modified by aromatized nitric acid radicals, and the thickness of the protective layer is about 100nm.

[0047] The surface of the lithium metal negative electrode modified by aromatized nitric acid radicals is smooth (see figure 1 ). The prepared lithium metal negative electrode was dissolved in 1,3-dioxane (DOL) / ethylene glycol dimethyl ether (DME) (volume ratio of 1 : 1) the mixed solution is electrolyte, 2wt% LiNO 3 As an additive, PE as a diaphragm, assembled into a Li||Li symmetrical battery, the current density is 5mA / cm 2 , the deposition cap...

Embodiment 2

[0049] Under the protection of argon gas, the compound (1) containing aromatized nitric acid radicals was dissolved in tetrahydrofuran (THF), and made into a solution with a mass fraction of 0.5%, and 50 μL of the solution was vertically dropped on the The surface of the metal lithium negative electrode is evenly coated, and left at room temperature for 12 hours to obtain a lithium metal negative electrode modified by aromatized nitric acid radicals, and the thickness of the protective layer is about 450nm.

[0050] The lithium metal negative electrode prepared by this method uses a mixed solution of 1M LiTFSI dissolved in DOL / DME (volume ratio 1:1) as the electrolyte, 2wt% LiNO 3 As an additive, PE as a diaphragm, and copper foil assembled into a Li||Cu battery, the test found that at a current density of 1mA / cm 2 , the deposition capacity is 1mAh / cm 2 Under the same conditions, its Coulombic efficiency is still 94% after 120 cycles (see Figure 4 ). Assembled with the S p...

Embodiment 3

[0052] Under the protection of argon gas, the compound (1) containing aromatized nitric acid free radicals was dissolved in N,N-dimethylformamide (DMF), and made into a solution with a mass fraction of 1.0%, and the Take 50 μL of the solution and drop it vertically on the surface of the lithium metal negative electrode, and coat it evenly, and leave it at room temperature for 12 hours to obtain a lithium metal negative electrode modified with aromatized nitric acid radicals, and the thickness of the protective layer is about 900 nm.

[0053] The lithium metal negative electrode prepared by this method is assembled into a symmetrical battery, and the current density is 10mA / cm 2 , the deposition capacity is 10mAh / cm 2 Under these conditions, the charge-discharge curve is stable, the cycle time can reach 600h, and the hysteresis voltage has also been greatly improved (see Figure 6 ). It shows that the metal lithium anode modified by aromatized nitric acid radical can effectiv...

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Abstract

The invention discloses preparation and application of a lithium metal negative electrode based on aromatized nitrate free radical modification. The material structurally has an aromatized nitrate free radical structure; when the structure is dissolved in an organic solvent and then dispensed on the surface of lithium metal, t elehectrons of the metal lithium elementary substance are taken away by the aromatic nitrate free radicals due to the strong electron obtaining capacity to form an artificial solid electrolyte membrane (SEI) covering the surface of the lithium metal; therefore a SEI film formed on the surface of the lithium metal is very uniform, so that the side reaction between the electrolyte and the lithium metal interface is obviously reduced; and meanwhile, the SEI film has high ionic conductivity and mechanical strength, so that the growth of lithium dendrites can be effectively inhibited, and the lithium metal negative electrode has safe and stable long cycle performance. The preparation method is simple, is suitable for large-scale production, is matched with a high-capacity positive electrode material, can meet the use requirements of a novel high-energy-density power battery, and has a wide application prospect.

Description

technical field [0001] The invention relates to lithium metal battery negative electrode materials and the field of electrochemistry, in particular to the preparation and application of a lithium metal negative electrode modified based on aromatized nitric acid radicals. Background technique [0002] After years of development since the commercialization of lithium-ion batteries, the existing electrochemical systems have gradually approached the bottleneck. [0003] With the advent of the post-lithium-ion battery era represented by long-cruising electric vehicles, the large capacity of batteries has become one of the most important performance indicators, and traditional lithium-ion batteries are difficult to be used as high-energy electrochemical energy storage devices. [0004] In many electrochemical energy storage systems, lithium metal-based batteries are due to their light weight (relative atomic mass of 6.941 g mol -1 and a density of 0.534 g cm -3 ), high theoretic...

Claims

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Application Information

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IPC IPC(8): C07B61/00C07C215/82C07D209/88C07D285/14C07D333/20C07D409/14C07D417/14H01M4/134H01M4/1395H01M4/38H01M4/62H01M10/0525
CPCC07B61/02C07C215/82C07D209/88C07D409/14C07D417/14C07D285/14C07D333/20H01M4/1395H01M4/134H01M4/628H01M4/382H01M10/0525H01M2004/027C07C2603/94Y02E60/10
Inventor 李远熊训辉陈超
Owner SOUTH CHINA UNIV OF TECH
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