Three-dimensional composite current collector and preparation method thereof

A three-dimensional composite and current collector technology, applied in the field of three-dimensional current collectors and their preparation, can solve the problems such as the lack of improvement in the bonding performance of composite materials and metal lithium, unfavorable battery tab welding and large-scale production, and metal lithium falling off easily. It is beneficial to buffer the electrode polarization reaction, improve the electrochemical performance, and reduce the actual current density.
CN112670516APending Publication Date: 2021-04-16HUAZHONG 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
2021-04-16

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Abstract

The invention provides a three-dimensional composite current collector and a preparation method thereof. The three-dimensional composite current collector provided by the invention comprises a copper foil base layer and a lithium battery negative electrode lithium-philic material coating coated on the copper foil base layer, wherein the lithium battery negative electrode lithium-philic material coating comprises a plurality of micron-sized three-dimensional spherical structures, and the lithium battery negative electrode lithium-philic material is composed of a carbon material, a lithium-philic metal oxide, a binder and a lithium salt. The preparation method comprises the following steps: firstly, preparing lithium battery negative electrode lithium-philic material slurry, then coating a copper foil base layer with the slurry to form a lithium battery negative electrode lithium-philic material coating, and preparing the lithium battery negative electrode three-dimensional composite current collector. According to the lithium battery negative electrode lithium-philic material, a copper foil is coated with a composite coating with a micron-sized three-dimensional spherical structure, so that the current density of a lithium metal negative electrode can be effectively reduced, the generation of lithium dendrites is effectively relieved and reduced, and the cycle performance and the safety performance of a lithium metal battery are improved.
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Description

technical field

[0001] The invention relates to the field of battery materials, in particular to a three-dimensional current collector and a preparation method thereof. Background technique

[0002] Lithium-ion batteries, which are currently commercially successful, have the characteristics of high working voltage, long cycle life, and no memory effect, and have been widely used in electric vehicles, mobile electronic devices and other fields. However, with economic development and technological progress, higher requirements are placed on the energy density of lithium-ion batteries. Traditional lithium-ion batteries mostly use graphite as the negative electrode material, and their theoretical capacity is limited. Today's commercial lithium-ion batteries are getting closer to their theoretical specific capacity. Therefore, it is necessary to seek and develop lithium batteries with higher energy density. The theoretical energy density of metal lithium anode materials can be ...

Claims

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