Metal cathode structure with protection layer and preparation method thereof
A technology of metal negative electrode and protective layer, applied in the field of metal negative electrode structure and its preparation, can solve the problems of low growth and cycle efficiency, etc.
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Embodiment approach 1
[0093] The present invention provides a preferred embodiment. The protective layer involved in the present invention is prepared by direct reaction of metal lithium and pyrrole in a chemical or electrochemical process.
[0094] To avoid H 2 The reaction process is best carried out under neutral or alkaline conditions (pH ≥ 7).
[0095] The lithium metal surface involved in the present invention is preferably cleaned with tetrahydrofuran in order to avoid H 2 Generate and stabilize pyrrole anions, this cleaning agent can also be extended to other types of inactive organic compounds, such as non-polar ethers (dimethyl ether, dimethyl sulfide, etc.), ketones (acetone, diethyl ketone Wait).
[0096] The inactive additives involved in the present invention can be pre-treated alone or mixed into the electrolyte together with pyrrole to treat the lithium metal surface. For example, pretreatment with tetrahydrofuran (THF) alone or with pyrrole at a volume ratio of 1:10 (V THF / V ...
Embodiment approach 2
[0113] The present invention also provides a more preferred embodiment, that is, the pretreatment step includes forming a metal nitride layer on the surface of the metal negative electrode.
[0114] The inner layer protective film material involved in the present invention is lithium nitride, and it contains two characteristics: (i) is lithium ion conductivity (10 -3 S / m) the highest inorganic compound; (ii) good compatibility with metal lithium negative electrode, strong repulsion to organic electrolyte components, which can effectively reduce the adverse effects between metal lithium and electrolyte components or impurities reaction. At the same time, these two features also make Li-Li 3 N can be applied in more different kinds of organic electrolytes and can inhibit dendrite growth. This type of protective film material can also be extended to other classes of single Li-ion conductors, such as LiPON, LiSON, Li 3 P etc.;
[0115] Preferably, the inner protective film mat...
specific Embodiment approach
[0121] A specific embodiment of the present invention is as follows:
[0122] 1. Li 3 Preparation and Electrical Properties Characterization of Lithium Anode Materials Coated with N Inorganic Film and Pyrrole Organic Film Composite
[0123] (1) In an inert atmosphere or vacuum environment, after sealing one side of the lithium strip, put it into a vacuum desiccator, and then pass a certain amount of N into the desiccator. 2 , N 2 The flow rate is 0.1~1L / s, and the time is 1~5h;
[0124] (2) In an inert atmosphere or a vacuum environment, the lithium strip is prepared as a disc electrode with a diameter of 14 mm and a thickness of 1 to 2 mm for later use;
[0125] (3) Prepare mixed solutions of pyrrole and tetrahydrofuran with different volume ratios (0.1-1) in a dark place according to the stoichiometric ratio, and immerse the prepared lithium sheet in (2) into the mixed solution for 1-3 minutes;
[0126] (4) In an inert atmosphere or a vacuum environment, dry the lithium ...
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Abstract
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