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Lithium-oxygen battery with nitrogen-containing carbon-supported nano-boron-lithium alloy as anode material

A lithium-oxygen battery, anode material technology, applied in battery electrodes, nanotechnology, nanotechnology and other directions, can solve the problems of electrolyte decomposition, restricting the selection of high-energy cathode materials, battery thermal runaway, etc., to reduce ohmic impedance and electrical conductivity. Beneficial and safety-enhancing effects

Inactive Publication Date: 2019-04-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If an aqueous electrolyte is used, the reduction potential of lithium ions is significantly lower than that of protons, resulting in the preferential generation of hydrogen gas during charging, resulting in the continuous electrolysis of water in the aqueous electrolyte, resulting in the decomposition of the electrolyte
Moreover, lithium anodes usually react violently in aqueous solution, causing thermal runaway of the battery
Therefore, the current lithium-ion batteries can only choose the aprotic electrolyte system, which also restricts the selection of paired high-energy cathode materials

Method used

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  • Lithium-oxygen battery with nitrogen-containing carbon-supported nano-boron-lithium alloy as anode material
  • Lithium-oxygen battery with nitrogen-containing carbon-supported nano-boron-lithium alloy as anode material
  • Lithium-oxygen battery with nitrogen-containing carbon-supported nano-boron-lithium alloy as anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Example 1: Preparation of NaCl-KCl eutectic salt

[0060] Add NaCl (45g) and KCl (55g) into a ball mill jar, mill at a speed of 700rpm for 1 hour, take it out and put it in a crucible, heat it in air at 700°C for 2 hours, and cool it to 25°C to obtain NaCl-KCl eutectic salt.

Embodiment 2

[0061] Example 2: Preparation of nitrogen-containing carbon-supported nano boron lithium

[0062] Take 10 g of glucose monohydrate, add glucose monohydrate, urea and lithium metaborate in a ball mill tank at a mass ratio of 4:2:1, and ball mill and mix at a speed of 700 rpm for 2 hours to prepare a precursor of nitrogen-containing carbon-loaded nano-boron-lithium;

[0063] Raise the temperature to 110°C for 2 hours under a nitrogen atmosphere, vacuumize and heat to 440°C for 8 hours, then raise the temperature to 900°C, heat for 2 hours and cool to room temperature to obtain a nitrogen-containing carbon-supported nano-boron-lithium alloy, three times The heating rate is 10°C / min, the distribution of nano-boron-lithium on the nitrogen-containing carbon material is as follows: figure 1 shown. The transmission electron microscope observation shows that the nano boron lithium is evenly distributed on the nitrogen-containing carbon material.

Embodiment 3

[0064] Embodiment three: the preparation of anode

[0065] Get the nitrogen-containing carbon-loaded nano-boron-lithium alloy (0.85g), acetylene black (0.1g) and commercially available Nafion solution (1g) containing 5wt% prepared in Example 2, nitrogen-containing carbon-loaded nano-boron-lithium Alloy, acetylene black, and Nafion solution are mixed and ground according to the mass ratio of 85:10:100, prepared into a paste, and then coated on carbon paper; after drying in the shade, at 100Kg / cm 2 Press molding under high pressure to obtain the anode.

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Abstract

The invention relates to the technical field of building materials, and aims to provide a lithium-oxygen battery using a nitrogen-containing carbon-loaded nano-boron-lithium alloy as an anode material. The lithium-oxygen battery uses carbon paper coated with cathode materials and anode materials as the cathode and anode, and the cathode and anode form a single-cell structure with the coating side facing each other and the diaphragm; wherein, the cathode plate and the anode plate are provided with inlets and outlets The channel is connected to the flow path in the plate, the inlet channel is on the bottom, the outlet channel is on the top, and the electrode side of the cathode plate and the anode plate are engraved with flow paths; the porous cathode coating layer is filled with catholyte; the porous anode coating layer is inside Filled with anolyte, the cathode and anode plates are sealed by sealing rings. The invention utilizes the characteristic of extremely high delithiation specific capacity of the boron-lithium alloy to form a large-capacity negative electrode material. The good conductivity of graphene is conducive to high-current discharge. The lithium-ionized perfluorosulfonic acid resin film is used to isolate the organic anolyte and aqueous catholyte, which improves the safety of lithium-oxygen batteries and can be applied to electric vehicles.

Description

technical field [0001] The invention relates to a lithium-oxygen battery anode material and a preparation method of the lithium-oxygen battery. More specifically, the invention relates to ball milling and mixing glucose, urea and lithium metaborate, and calcining in sections to obtain nitrogen-containing carbon-loaded nano Boron-lithium alloy is used as the anode material of lithium-oxygen battery. Glucose, urea, cobalt nitrate and NaCl-KCl eutectic salt are ball-milled and mixed. After calcination in sections, the salt is washed away with water to obtain graphene-supported nano-cobalt as the cathode of lithium-oxygen battery. material, and a preparation method for obtaining a lithium-oxygen battery by using the anode material and the cathode of the present invention. Background technique [0002] Lithium-ion batteries have the advantages of light weight, large capacity, and no memory effect, so they have been widely used. Many digital devices now use lithium-ion batteries ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/36H01M4/583H01M4/62H01M12/08B82Y30/00B82Y40/00
CPCH01M4/362H01M4/382H01M4/583H01M4/625H01M12/08B82Y30/00B82Y40/00Y02E60/10
Inventor 李睿刘宾虹李洲鹏
Owner ZHEJIANG UNIV