A composite metal lithium negative electrode and its preparation method and application

A composite metal and lithium negative electrode technology, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the lack of stable SEI interface protection of three-dimensional current collectors, the difficulty of avoiding the influence of volume expansion in electrolyte modification, and the high cost of artificial SEI films and other problems, to achieve the effect of inhibiting the growth of lithium dendrites, avoiding irreversible attenuation, and low cost
CN113629236BActive Publication Date: 2022-08-05HUAZHONG UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HUAZHONG UNIV OF SCI & TECH
Publication Date
2022-08-05

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Abstract

The invention belongs to the technical field of lithium batteries, and specifically discloses a composite metal lithium negative electrode and a preparation method and application thereof. The negative electrode comprises a three-dimensional carbon-based current collector with a porous structure, and a metal attached to the surface of the three-dimensional carbon-based current collector and in the internal pores. Lithium, and a protective film covering metal lithium; the protective film includes a lithiophilic metal and a lithium salt, and the lithiophilic metal is a metal that can be reduced and replaced by lithium metal; the composite metal lithium negative electrode is in the first charge and discharge process with the electrolysis The liquid reacts to form a stable solid electrolyte phase interface, and the solid electrolyte phase interface will not decompose during subsequent charge and discharge processes. The three-dimensional carbon-based current collector, lithiophilic metal and lithium salt in the composite metal lithium negative electrode of the invention play the roles of relieving the volume strain of the negative electrode, inducing uniform deposition of lithium and forming a stable SEI film on the surface of the negative electrode, and the preparation method is simple, practical and cost-effective. Low, it is used in metal lithium secondary batteries, which can greatly improve the cycle life of the battery and improve the battery performance.
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Description

technical field

[0001] The invention belongs to the technical field of lithium batteries, and more particularly, relates to a composite metal lithium negative electrode and a preparation method and application thereof. Background technique

[0002] The extensive use of fossil fuels has brought about energy crisis and environmental problems, and it is imminent to develop new energy technologies. New energy technologies have an increasing demand for high-efficiency energy storage systems with high specific energy. Traditional lithium-ion batteries have an upper limit of theoretical energy density, which makes it difficult to meet these demands. Therefore, it is of far-reaching significance to develop lithium batteries with higher specific capacity. Among them, lithium metal batteries with lithium metal as the negative electrode of the battery have obvious advantages: metal lithium has a very high theoretical specific capacity (3860mAhg -1 ) with the lowest chemical potential...

Claims

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