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 Coulombi

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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Example Embodiment

[0045] Example 1:

[0046] Under argon protective gas, containing the compound (1) an aromatic radical of nitrate was dissolved in dimethyl sulfoxide (DMSO), and the mass fraction of 0.1% formulated into a solution, the solution was taken 50μL pipette vertical dropped metal lithium negative electrode surface, and coating uniformity, resting 12h at room temperature, i.e., the radical obtained by aromatized nitrate modified lithium metal anode, thickness of the protective layer was about 100nm.

[0047] Lithium metal by the nitric acid radical of an aromatic modified flat negative electrode surface (see figure 1 ). The resulting lithium metal anode to 1M lithium bis trifluoromethane sulfonimide (of LiTFSI) was dissolved in 1,3-dioxolane (DOL) / ethylene glycol dimethyl ether (the DME) (volume ratio of 1 : 1) mixed solution as electrolyte, 2wt% LiNO 3 As additive, PE separator is assembled into a symmetrical Li || Li batteries, a current density of 5mA / cm 2 Deposition capacity 5mAh...

Example Embodiment

[0048] Example 2:

[0049] Under argon protective gas, containing the compound (1) an aromatic radical of nitrate was dissolved in tetrahydrofuran (THF), and the mass fraction of 0.5% formulated into a solution, with a pipette to take the vertical 50μL solution dripping metal lithium negative electrode surface, and coating uniformity, resting 12h at room temperature to obtain aromatized nitrate radical modified by lithium metal anode, thickness of the protective layer is about 450nm.

[0050] The lithium metal anode method were dissolved in 1M LiTFSI DOL / DME (volume ratio of 1: 1) mixed solution as electrolyte, 2wt% LiNO 3 As additive, PE as a diaphragm, and a copper foil assembled into batteries Li || Cu, testing found that the current density of 1mA / cm 2 Deposition capacity 1mAh / cm 2 Under the conditions, after which the cycle coulombic efficiency ring 120 is still 94% (see Figure 4 ). And S sake assembled battery positive electrode material, at a current density of 0.5C, ...

Example Embodiment

[0051] Example 3:

[0052] Under argon protective gas, containing the compound (1) an aromatic radical of nitrate was dissolved in N, N- dimethylformamide (DMF), the mass fraction and dubbed 1.0% solution, with a pipette take 50μL of the solution was dropped in the vertical metal lithium negative electrode surface, and coating uniformity, resting 12h at room temperature to obtain aromatized nitrate radical modified by lithium metal anode, thickness of the protective layer is about 900nm.

[0053] The method were assembled into a lithium metal negative electrode cell symmetry, a current density of 10mA / cm 2 Depositing a capacity of 10mAh / cm 2 Under conditions which stabilize the charge-discharge curves, the cycle time can be achieved 600H, the hysteresis voltage has been greatly improved (see Image 6 ). It revealed that a metal lithium negative electrode aromatized after modified radical nitric acid can effectively inhibit the growth of lithium dendrites, shows excellent electr...

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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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