Solid-state composite metal lithium negative electrode

Abstract

The invention provides a solid-state composite metal lithium negative electrode. The solid-state composite metal lithium negative electrode consists of a composite layer and a solid-state electrolyteprotecting layer, wherein the composite layer consists of metal lithium and lithium-favoring framework material; the solid-state electrolyte protecting layer comprises an inorganic solid-state electrolyte and an organic solid-state electrolyte; the composite layer of metal lithium and lithium-favoring framework material is provided by melting and lithium filling, electrochemical deposition or physical and mechanical mixing; the solid-state electrolyte protecting layer is applied to the surface of the composite layer by impregnating, scrape coating, rotary coating, spray coating or spattering.Compared with the common lithium piece negative electrode, the solid-state composite metal lithium negative electrode has the advantages that the problem of volume expansion of the negative electrodeis relieved, the deposition behavior of the metal lithium can be regulated and controlled, the growth of lithium dendrites can be inhibited, the safety property of a metal lithium battery is improved,and the cycle life of the metal lithium battery is prolonged; in the testing process of a lithium and copper semi-battery, the volume is expanded by 1 to 20% in the charge and discharge process, theobvious dendrites do not occur in the 20 to 5000 cycles of the battery, and the utilization rate is increased to 80 to 99.9999%.

Description

technical field [0001] The invention relates to a lithium metal negative electrode, in particular to a solid composite lithium metal negative electrode, which belongs to the technical field of lithium metal batteries. Background technique [0002] The rapid development of modern society makes people have higher and higher requirements for high-end energy storage devices. Although traditional lithium-ion batteries (especially graphite anodes) are continuously optimized and developed, their actual energy density has gradually approached the theoretical limit. (372mAh g -1 ), but it is still difficult to meet the requirements of many high specific energy storage devices, such as new energy vehicles (400Wh kg -1 ). Therefore, it has a very high theoretical capacity (3860mAh g -1 ) and the most negative potential (−3.040 V vs. standard hydrogen electrode), the “holy grail” lithium metal anode has received great attention. Lithium-sulfur batteries and lithium-oxygen batteries,...

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Problems solved by technology

[0004] Although the above two solutions can solve the different problems of metal lithium anodes to a certain extent, the failure of metal lithium electrodes is still unavoidable. At present, there is no very effective way to solve various problems in the application of metal lithium anodes at the same time.