Preparation method of high-porosity binder-free Co3Mo3N positive electrode and application of high-porosity binder-free Co3Mo3N positive electrode in lithium-carbon dioxide battery

Abstract

The invention discloses a preparation method of a high-porosity binder-free Co3Mo3N positive electrode and application of the high-porosity binder-free Co3Mo3N positive electrode in a lithium carbon dioxide battery. Belongs to the technical field of electrochemical energy. According to the invention, a Co3Mo3N material is used as a positive active material, a manufacturing method of a binder-free polar plate is designed and used to prepare the positive plate of the lithium-carbon dioxide battery, and the prepared Co3Mo3N polar plate is used as a positive electrode of the lithium-carbon dioxide battery, so that good battery performance is obtained, charge-discharge voltage polarization is remarkably reduced, and good application potential is achieved. The invention provides design and manufacturing of a Co3Mo3N positive electrode plate which is used for a lithium carbon dioxide battery.

Claims

1. A method for preparing a high-porosity binder-free Co3Mo3N positive electrode, characterized in that: It is prepared by electrospinning technology, which specifically includes the following steps: Step (1) Synthesis of a precursor spinning solution: Cobalt molybdate and a nitrogen-containing polymer in a certain mass ratio are mixed and dissolved in a DMF solvent, and heated and stirred by an oil bath method to obtain a uniformly mixed spinning solution; Step (2) Synthesis of electrospinning membrane: The obtained uniformly mixed spinning solution is subjected to electrospinning, and after spinning, it is placed in a vacuum oven for drying for later use; Step (3) Preparation of binder-free cobalt-molybdenum bimetallic nitride positive electrode: The dried spun membrane is transferred to a tubular furnace protected by an inert atmosphere, heated at a certain heating rate and kept warm for a certain period of time, and then cooled naturally to room temperature to obtain the binder-free cobalt-molybdenum bimetallic nitride positive electrode, i.e., the high-porosity binder-free Co3Mo3N positive electrode.

2. The method for preparing a high-porosity binder-free Co3Mo3N positive electrode according to claim 1, characterized in that: The nitrogen-containing compound in step (1) is polypyrrole, melamine or urea; the mass ratio of cobalt molybdate to the nitrogen-containing compound is 1:1-1:10, the oil bath heating and stirring time is 10-18 hours, and the oil bath reaction temperature is 60-100°C.

3. The method for preparing a high-porosity binder-free Co3Mo3N positive electrode according to claim 1, characterized in that: The electrospinning in step (2) uses a single-head or double-head syringe pump, and its parameters are set as follows: voltage is 15-18 V, and the flow rate of the syringe pump is 0.03-0.08 mm min -1 , the receiving distance is 50~100 mm.

4. The method for preparing a high-porosity binder-free Co3Mo3N positive electrode according to claim 3, characterized in that: The inert atmosphere described in step (3) is one or more of nitrogen, helium, argon or argon-hydrogen mixture; the heating rate of the tubular furnace is 2-10°C / min, the calcination temperature is 400-1000°C, and the calcination time is 1-6 hours.

5. A high porosity binder-free Co3Mo3N positive electrode, characterized in that: Prepared by the method according to any one of claims 1 to 4.

6. A lithium carbon dioxide battery, characterized in that: The binder-free Co3Mo3N positive electrode described in claim 5 is used as the positive electrode of the battery, and metallic lithium is used as the negative electrode and the reference electrode; the electrolyte is prepared by dissolving lithium salt in an organic solvent.

7. A lithium carbon dioxide battery as claimed in claim 6, characterized in that: The lithium salt concentration is 1 M to 1.2 M, the lithium salt is one or more of lithium bis(trifluoromethanesulfonyl)imide, lithium bis(fluorosulfonyl)imide, lithium bis(oxalate)borate or lithium difluorooxalateborate, and the solvent used is tetraethylene glycol dimethyl ether or dimethyl sulfoxide.

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