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Lithium metal battery negative electrode and preparation method thereof

A lithium metal battery and negative electrode technology, which is applied in the field of lithium metal battery negative electrode and its preparation, can solve the problems of hindering the practical application of lithium metal battery, uneven lithium deposition, capacity loss, etc., and achieves reduction of nucleation overpotential and affinity The effect of lifting, polarization improvement

Pending Publication Date: 2022-07-12
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the inherent characteristics of lithium metal, there will be many problems in the charging and discharging process of lithium anode: uneven deposition of lithium caused by the formation of lithium dendrites, corrosion of electrodes, dead lithium and volume expansion; these problems will cause lithium metal The capacity of the battery will be seriously lost or even explode after long-term operation
Early research and exploration of lithium metal batteries focused on the reversibility of lithium anodes, but the above problems have always hindered the practical application of lithium metal batteries

Method used

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  • Lithium metal battery negative electrode and preparation method thereof
  • Lithium metal battery negative electrode and preparation method thereof
  • Lithium metal battery negative electrode and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] The preparation steps of a lithium metal battery negative electrode are as follows:

[0026] (1) Measure a certain amount of concentrated hydrochloric acid into distilled water and dilute to 1mol / L;

[0027] (2) Place the copper foil in diluted hydrochloric acid for cleaning to remove impurities and grease on the surface of the copper foil, and then repeatedly wash it with secondary water 3 times, then with anhydrous ethanol 3 times, and blow it with a hair dryer after cleaning. Dry;

[0028] (3) The copper foil obtained in step (2) is directly placed in a muffle furnace for heating treatment, and the temperature is raised to 250°C at a heating rate of 2°C / min, and the holding time is 2h;

[0029] (4) Weigh 20 mg of lithium oxide as the lithium source and place it in the porcelain boat;

[0030] (5) Cut the oxidized copper foil to 3 cm*6 cm and place it on the porcelain boat and fix it;

[0031] (6) Put the porcelain boat in step (5) in a high-temperature reaction fu...

Embodiment 2

[0033] A lithium metal battery negative electrode, wherein the negative electrode is a layer of LiCuO lithiophilic layer decorated on the surface of a copper foil current collector.

[0034] A preparation step for a negative electrode of a lithium metal battery is as follows:

[0035] (1) Measure a certain amount of concentrated hydrochloric acid into distilled water and dilute to 1mol / L;

[0036] (2) Place the copper foil in diluted hydrochloric acid for cleaning to remove impurities and grease on the surface of the copper foil, and then repeatedly wash it with secondary water 3 times, then with anhydrous ethanol 3 times, and blow it with a hair dryer after cleaning. Dry;

[0037] (3) The copper foil obtained in step (2) is directly placed in a muffle furnace for heating treatment, and the temperature is raised to 200°C at a heating rate of 2°C / min, and the holding time is 3h;

[0038] (4) Weigh 50 mg of lithium hydroxide as the lithium source and place it in the porcelain ...

Embodiment 3

[0042] A lithium metal battery negative electrode, wherein the negative electrode is a layer of LiCuO lithiophilic layer decorated on the surface of a copper foil current collector.

[0043] A preparation step for a negative electrode of a lithium metal battery is as follows:

[0044] (1) Measure a certain amount of concentrated hydrochloric acid into distilled water and dilute to 1mol / L;

[0045] (2) Place the copper foil in diluted hydrochloric acid for cleaning to remove impurities and grease on the surface of the copper foil, and then repeatedly wash it with secondary water 3 times, then with anhydrous ethanol 3 times, and blow it with a hair dryer after cleaning. Dry;

[0046] (3) The copper foil obtained in step (2) is directly placed in a muffle furnace for heating treatment, and the temperature is raised to 300°C at a heating rate of 2°C / min, and the holding time is 1h;

[0047] (4) Weigh 100 mg of lithium carbonate as the lithium source and place it in the porcelain...

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Abstract

The invention discloses a lithium metal battery negative electrode and a preparation method thereof, belongs to the technical field of battery energy, and aims to construct a lithium-loving layer on the surface of a copper current collector, reduce the nucleation overpotential during lithium metal deposition, improve the polarization condition of an electrode, improve the reversibility of electrode reaction in the battery and prolong the service life of the lithium metal battery. The negative electrode of the lithium metal battery used in the invention is a composite current collector modified with a lithium-loving layer; the preparation method comprises the following steps: firstly, placing a cleaned copper foil in a muffle furnace by adopting an air oxidation method to oxidize, forming an oxide layer on the surface of a current collector, then modifying the oxidized copper current collector by utilizing a thermal diffusion method by virtue of the volatility of lithium oxide, finally obtaining the composite current collector, and assembling the battery to test the electrochemical performance of the battery. The result shows that lithium is stably and uniformly deposited on the surface of the electrode, and the cycle life and coulombic efficiency of the lithium metal battery are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of energy batteries, and particularly relates to a negative electrode of a lithium metal battery and a preparation method thereof. Background technique [0002] In recent years, energy and environmental problems have increasingly threatened human society. In order to reduce the consumption of fossil fuels, the automobile industry is gradually transitioning to electric vehicles. However, since the current lithium-ion batteries are mainly for 3C electronic products, when the current lithium-ion batteries are applied to the electric vehicle industry, the capacity problem of the lithium-ion batteries brings mileage anxiety to the users of electric vehicles. The reason is the limitation of low energy density (299W h kg) of Li-ion batteries based on traditional graphite anodes. -1 ) cannot meet people’s demand for ever-increasing energy density of energy storage products, and research on lithium metal anodes has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/42
CPCH01M4/667H01M4/661H01M10/4235Y02E60/10
Inventor 黄现礼左中正庄冬梅赵嫚嫚王涛何建平
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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