Composite lithium metal anode

Abstract

The invention discloses a composite lithium metal anode. The composite lithium metal anode comprises lithium metal and a functional three-dimensional framework, wherein the functional three-dimensional framework is of a structure formed by mutually inserting and interlacing framework parts, and the structure is provided with a gap or an empty chamber which is filled with the lithium metal; the functional three-dimensional framework is 1nm to 500 microns in thickness. According to the prepared composite lithium metal anode, rich functional group structure on the surface of the functional three-dimensional framework is capable of specifically recognizing and combining lithium ion and negative ions in a three-dimensional space of the anode, so that the balance between the lithium ion and thenegative ions at the interface can be realized; the ion concentration gradient under electric field driving is prevented; the effect of effectively adjusting the distribution of the anode ions in therepeated charge and discharge processes can be realized; dendritic crystal is prevented from growing in the interface; the coulombic efficiency and the safety of the lithium metal anode are effectively improved; the circulation life of the lithium metal anode is effectively prolonged.

Description

technical field [0001] The invention belongs to the field of lithium batteries, in particular to a composite lithium metal negative electrode. Background technique [0002] Since the advent of commercial lithium-ion batteries in 1991, they have been widely used in smartphones, wearable devices, electric vehicles and other fields, and have become an important part of people's daily life. In recent years, lithium-ion battery graphite negative electrode is affected by its theoretical capacity (372mAh g -1 ) limitation, it is difficult to increase its specific energy significantly, so it is imperative to develop a next-generation lithium battery system. [0003] Lithium metal is the lightest metal (0.534g cm -3 ), its theoretical capacity is 3860mAh g -1 , which is about 10 times that of graphite negative electrode, which can greatly improve the energy density of lithium batteries. However, during the repeated charge and discharge process of lithium metal batteries, a large ...

AI Technical Summary

Problems solved by technology

However, the current solid-state electrolytes generally have disadvantages such as low room temperature lithium ion conductivity, complex synthesis conditions, and high prices, which limit their current development to a certain extent.

[0007] The above methods have alleviated the problems existing in lithium metal batteries to a certain extent, but none of them can solve the root cause of the growth of lithium dendrites.

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