A kind of alkali metal composite negative electrode and its preparation method and its application in the preparation of solid alkali metal battery

Abstract

The invention discloses an alkali metal composite negative electrode and a preparation method thereof and application of the alkali metal composite negative electrode in preparing a solid-state alkalimetal battery. The alkali metal composite negative electrode comprises a support layer and alkali metal loaded on the surface and the void of the support layer. The support layer is carbon cloth, 3Dporous graphene, a nickel mesh, a copper mesh or an aluminum mesh. The preparation of the solid-state alkali metal battery comprises the steps: placing the support layer in the molten alkali metal under the inert atmosphere, soaking it sufficiently and cooling so as to obtain the alkali metal composite negative electrode; a monomer containing unsaturated bonds, a ceramic electrolyte, a lithium salt and a selectively added functional additive are mixed with an organic solvent so as to obtain a solid-state electrolyte precursor; and assembling the alkali metal composite negative electrode, a positive electrode, a diaphragm and the solid-state electrolyte precursor to form a liquid battery and then adding an initiator and performing in-situ polymerization. The alkali metal composite negativeelectrode can effectively inhibit the formation of alkali metal dendrites and the interface reaction between the alkali metal and the electrolyte, and the prepared solid-state alkali metal battery hasbetter safety performance and comprehensive performance.

Description

technical field [0001] The invention relates to the field of novel solid-state batteries, in particular to an alkali metal composite negative electrode and a preparation method thereof, as well as the application of the alkali metal composite negative electrode in the preparation of solid-state alkali metal batteries and a novel solid-state alkali metal battery prepared. Background technique [0002] Although lithium-ion batteries still occupy a dominant position in secondary batteries, as new energy vehicles require higher and higher energy density of lithium-ion batteries, the energy density of traditional lithium-ion batteries based on intercalation reactions has reached the limit, namely The energy density of lithium-ion batteries with graphite as the negative electrode is close to the bottleneck value, and it is imperative to develop lithium batteries (including lithium-sulfur batteries and lithium-air batteries) with metal lithium as the negative electrode. On the othe...

AI Technical Summary

Problems solved by technology

[0005] This technical scheme uses an electrochemical method to deposit lithium in lithium-rich materials or lithium salts on graphene supported by copper foil to obtain a metal lithium / graphene composite negative electrode. Although this method can obtain a relatively uniform composite negative electrode, it is suitable for comparison. Thin electrode, but when the electrode is thicker, it is easy to cause uneven distribution of lithium in graphene

In addition, the graphene film grown with methane gas usually has an irregular carbon structure, and the alkali metal is not uniformly recombined with it, which is not ideal for inhibiting lithium dendrites.

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