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li-co 2 Battery positive electrode catalyst material and preparation method thereof, battery positive electrode material and battery

A battery cathode and catalyst technology, applied in the field of electrochemistry, can solve the problems of agglomeration, shedding, affecting the electrochemical performance of the battery, etc., achieving stable performance, broad application prospects, and improving the electrocatalytic performance of Li-CO2 battery cathodes.

Active Publication Date: 2021-09-07
XINYANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Whether it is lithium-air battery or Li-CO 2 battery, lithium 2 CO 3 The generation of is inevitable, and Li 2 CO 3 Superoxide radicals generated from self-decomposition affected Li-CO 2 Catalyst stability during battery electrochemical process, which in turn affects Li-CO 2 Battery Cycle Performance
The high dispersion system formed by adding single metal nanoparticles can further improve the Li-CO 2 The electrochemical performance of the battery, however, there are certain defects in single-metal catalysts, for example: ruthenium nanoparticles usually need to be synthesized under mild experimental conditions, and cannot form stable catalytic crystal faces, which will further affect the Li-CO 2 The electrochemical performance of the battery; secondly, in Li-CO 2 During battery cycling, severe agglomeration and shedding may occur due to the incompatibility of discharge products with single metal nanoparticles

Method used

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  • li-co <sub>2</sub> Battery positive electrode catalyst material and preparation method thereof, battery positive electrode material and battery
  • li-co <sub>2</sub> Battery positive electrode catalyst material and preparation method thereof, battery positive electrode material and battery
  • li-co <sub>2</sub> Battery positive electrode catalyst material and preparation method thereof, battery positive electrode material and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] a Li-CO 2 A method for preparing a positive electrode catalyst material for a battery, comprising the following steps:

[0032] a. Pour 15mg of graphene, 50mg of ruthenium trichloride hydrate, 50mg of copper acetate, 200mg of polyvinylpyrrolidone (PVP), and 20ml of ethylene glycol into a four-necked flask to prepare a precursor solution. The precursor solution is in a four-necked flask The filling amount is 20%~50%, and the four-neck flask is ultrasonicated at 50Hz for 0.5h.

[0033] b. In an argon environment, connect the four-necked flask to a condensing device, stir evenly in an oil bath at 180°C for two minutes, then add 0.5ml of benzaldehyde, continue stirring for 1 hour, and cool; centrifuge at 9500 rpm, wash with ethanol six times, Centrifuge for 8 minutes each time; place in a vacuum oven at 80 o C dried overnight; calcined at 600°C for 8 hours in a tube furnace fed with argon-hydrogen mixed gas, 90% argon and 10% hydrogen in the argon-hydrogen mixed gas to ob...

Embodiment 2

[0038] a Li-CO 2 Battery positive electrode material, by weight percentage, by 90% above-mentioned Li-CO 2 The battery cathode catalyst material and 10% binder (PVDF) composition.

[0039] Contains the above Li-CO 2 Li-CO as battery cathode material 2 The positive electrode sheet of the battery, the preparation steps are as follows:

[0040] 1) Dissolve 4.5mg of positive electrode catalyst material and 0.5mg of polyvinylidene fluoride (PVDF) in 0.2ml of nitrogen-methylpyrrolidone (NMP), stir on a magnetic stirrer for 1 hour, and mix well to obtain a liquid mixture.

[0041] 2) Spread the above liquid mixture on the carbon sheet (model TGP-H-060, 12mm in diameter, purchased from Shanghai Hesen Electric Co., Ltd.), the film surface should be as flat as possible, at 80 o After drying in a C oven for 12 hours, Li-CO 2 Battery positive electrode sheet (the amount of NMP depends on the amount of liquid mixture on the carbon sheet and the number of positive electrode sheets prod...

Embodiment 3

[0043] With the Li-CO that embodiment 2 obtains 2 Battery positive pole piece assembled columnar Li-CO 2 For batteries, it was carried out in an inert glove box filled with high-purity Ar, humidity and O 2 The content is all controlled below 1ppm, and the steps are as follows:

[0044] 1) Send the black positive electrode sheet, negative electrode sheet, battery shell, separator, current collector, electrolyte, disposable straw, plastic tweezers, and sealed bag into the glove box;

[0045] 2) The self-made electrode disc is used as the positive electrode, the lithium sheet is used as the negative electrode, the diaphragm is made of porous polypropylene diaphragm, and the electrolyte is 1M LITFSI / TEGDME (the diaphragm should be soaked in the electrolyte for a period of time);

[0046] 3) First drop a drop of electrolyte in the bottom case of the battery, then add lithium sheet, diaphragm, and black positive electrode sheet in sequence (place the side with the material facing ...

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Abstract

The invention belongs to the technical field of electrochemistry and relates to a Li-CO 2 Battery cathode catalyst material and preparation method thereof, battery cathode material and battery. The preparation method of the cathode catalyst material comprises the following steps: dissolving graphene, ruthenium trichloride hydrate, copper acetate, and polyvinylpyrrolidone in ethylene glycol to prepare a precursor solution, ultrasonication; Stir evenly under the bath for two minutes, then add benzaldehyde, continue to stir for 1 hour, cool, centrifuge, vacuum dry, and calcinate to obtain a ruthenium-copper bimetal positive electrode catalyst material dispersed on graphene. Li‑CO 2 Battery cathode catalyst material applied to Li‑CO 2 When the battery is positive, at a current density of 200mA / g, the voltage range is 2~4.5V, and when the cut-off capacity is 1000mAh / g, Li‑CO 2 The performance of the positive electrode of the battery is still very stable after 100 cycles. Compared with copper or ruthenium single metal as the positive electrode catalyst, LiCO 2 The electrocatalytic performance of the positive electrode of the battery has been greatly improved. 2 The battery field has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry and relates to a Li-CO 2 Battery cathode catalyst material and preparation method thereof, Li-CO 2 Battery cathode materials and Li-CO 2 Battery. Background technique [0002] Due to Li-CO 2 Batteries have many advantages such as environmental friendliness, high energy density, cheap raw materials, and reversible electrochemical reactions, and are considered to be the most promising secondary batteries. With the development of modern manufacturing technology, Li-CO 2 Compared with other energy storage systems, batteries will be widely used in electronic equipment, communication devices and other fields. [0003] But Li-CO 2 Electrochemical CO of the battery 2 reduction reaction (CRR) and CO 2 The evolution reaction (CER) still needs to be improved, and Li-CO 2 There are still many problems in the battery itself, such as low charge and discharge efficiency, poor cycle performance,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92H01M12/08
CPCH01M4/921H01M12/08Y02E60/10
Inventor 张彰王傲楠吴双双杨超
Owner XINYANG NORMAL UNIVERSITY
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