Metal lithium composite negative electrode material and preparation method thereof

A negative electrode material, metal lithium technology, applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the safety problems of lithium-ion batteries and other problems, and achieve the effect of stable cycle performance, high safety, and rapid charge and discharge

Active Publication Date: 2018-09-14
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0005] In order to overcome the safety problem of existing lithium-ion batteries, the invention

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  • Metal lithium composite negative electrode material and preparation method thereof
  • Metal lithium composite negative electrode material and preparation method thereof
  • Metal lithium composite negative electrode material and preparation method thereof

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[0034]In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0035] see figure 1 , the first embodiment of the present invention provides a preparation method S10 of metal lithium composite negative electrode material, which includes the following steps:

[0036] Step S11, providing a carbon nanotube film;

[0037] Step S12, forming a non-lithium metal coating on the outer surface of the carbon nanotubes in the carbon nanotube film and / or the gaps between the carbon nanotubes to form a non-lithium metal coating-carbon nanotube composite with a non-lithium metal coating- carbon nanotube composite film; and

[0038] Step S13, distributing me...

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Abstract

The invention relates to the field of lithium ion batteries, in particular to a metal lithium composite negative electrode material and a preparation method thereof. The preparation method is furtherbased on electroplating process and includes: taking a carbon nanotube thin film as an electroplating substrate, and electroplating a metal coating with certain thickness to improve electronic conductivity of the material; distributing metal lithium particles in the hollow inside of a non-lithium metal coating-carbon nanotube compound and/or gaps in the non-lithium metal coating-carbon nanotube compound in a non-lithium metal coating-carbon nanotube composite thin film to obtain the metal lithium composite negative electrode material. The advantages of high strength of carbon nanotubes and high conductivity of hollow structure and the non-lithium metal coating are combined to support stabilizing and quick disembedding of the metal lithium active material so as to improve cycling stabilityof the material.

Description

【Technical field】 [0001] The invention relates to the field of lithium ion batteries, in particular to a metal lithium composite negative electrode material and a preparation method thereof. 【Background technique】 [0002] Traditional lithium-ion rechargeable batteries generally use organic electrolytes. In recent years, the development of batteries with high energy density and lithium-containing negative electrodes has become a research hotspot. Lithium metal has the advantages of light weight and high energy density. However, the commercial application of lithium metal anodes is limited by the following limitations: huge volume expansion and lithium dendrite growth. Therefore, the cycle and safety performance of lithium metal anodes need to be improved. [0003] From a practical point of view, for lithium metal anodes, the volume change is large due to its absence of a host. This means that in the extreme cycle process, when all the lithium migrates to the positive electr...

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Application Information

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IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/366H01M4/625Y02E60/10
Inventor 向勇伍芳张晓琨
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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