Ultrathin metal lithium electrode, preparation method thereof, and application of ultrathin metal lithium electrode as negative electrode of secondary lithium battery

Abstract

The invention discloses an ultrathin metal lithium electrode, a preparation method thereof, and application of the ultrathin metal lithium electrode as a negative electrode of a secondary lithium battery. The ultrathin metal lithium electrode comprises a metal lithium layer and a current collector layer, the surface of the current collector layer is coated with the metal lithium layer, the thickness of the metal lithium layer is 1-100 [mu] m, The metal lithium layer comprises metal lithium, an additive component and a framework component; the additive component comprises an inorganic material of which the surface contains halogen element functional groups, and / or an inorganic material which can be compatible with liquid metal lithium or lithium alloy; and the framework component is a nano material with a one-dimensional and / or two-dimensional structure, and the nano material with the one-dimensional or two-dimensional structure can form a three-dimensional network structure in the metal lithium layer. The ultrathin metal lithium electrode can be used as a negative electrode to manufacture a novel lithium battery with matched positive and negative electrode capacities, and has better safety and higher energy density due to the fact that the ultrathin metal lithium electrode does not contain excessive lithium.

Description

technical field [0001] The invention relates to the field of energy storage batteries, in particular to an ultra-thin metal lithium electrode, its preparation and its application as a negative electrode of a secondary lithium battery. Background technique [0002] Lithium metal has always been regarded as the most ideal negative electrode material for lithium batteries, which has a very high theoretical specific capacity (3860mAh g -1 ), low density (0.59g·cm -3 ) and the most negative electrochemical potential (about -3.04V compared to the standard hydrogen electrode) and other excellent properties. As early as the 1970s and 1980s, lithium metal batteries began to be commercialized. In 1972, Exxon Petroleum Company developed Li / TiS 2 Lithium secondary batteries, followed by Li / MnO 2 , Li / Ag 2 V 4 o 11 Lithium metal batteries have been researched and developed one after another, but metal lithium is used as the negative electrode material. In the process of repeated ch...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the above-mentioned technical problems such as the capacity mismatch between the metal lithium negative electrode and the positive electrode material in the above-mentioned dilithium secondary battery, resulting in the waste of metal lithium capacity and potential safety hazards, the first aspect of the present invention provides an ultra-thin metal lithium electrode, including a metal lithium layer and A current collector layer, the metal lithium layer is covered on the surface of the current collector layer, the thickness of the metal lithium layer is between 1 μm and 100 μm, and the metal lithium layer includes metal lithium, additive components and skeleton components;

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