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Preparation method and application of a battery catalyst

A catalyst and battery technology, applied in chemical instruments and methods, physical/chemical process catalysts, battery electrodes, etc., can solve problems such as poor cycle performance, high charge-discharge overpotential, and low energy conversion efficiency

Active Publication Date: 2020-09-29
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Depletion of carbon electrodes leads to a drop in battery energy density
In addition, during the charging process of lithium-oxygen batteries, the generated lithium carbonate has a high decomposition potential and is difficult to completely decompose.
Accumulated lithium carbonate clogs the electrodes and eventually causes the battery to fail
Therefore, the use of carbon materials as oxygen electrodes will bring three problems to lithium-oxygen batteries: low discharge capacity, high charge-discharge overpotential (low energy conversion efficiency) and poor cycle performance (short life)
These methods have some drawbacks and limitations: the synthesis conditions are harsh and difficult to control, the powder yield is low and the cost is high
These methods are suitable for laboratory research, not suitable for industrial production

Method used

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  • Preparation method and application of a battery catalyst
  • Preparation method and application of a battery catalyst
  • Preparation method and application of a battery catalyst

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preparation example Construction

[0037] In one embodiment, a method for preparing a battery catalyst comprises the following steps:

[0038] A method for preparing a battery catalyst, comprising the steps of:

[0039] S1. Using noble metal salts and magnesium salts to prepare a mixed solution containing noble metals and magnesium ions;

[0040] S2. Adding a complexing agent to the mixed solution containing noble metals and magnesium ions to prepare a complexing solution;

[0041] S3, evaporating the volatile solvent in the complex solution containing noble metals and magnesium ions to obtain a gel containing noble metals and magnesium ions;

[0042] S4, heat treating the gel to obtain a foamy precursor, and performing a second heat treatment on the precursor to obtain a noble metal / magnesia composite powder or a noble metal oxide / magnesia composite powder;

[0043] S5. Adding the noble metal / magnesia composite powder or the noble metal oxide / magnesia composite powder into the acid solution for etching, and ...

Embodiment 1

[0059] Ultrafine monodisperse RuO 2 Preparation:

[0060] Dissolve ruthenium chloride hydrate (or ruthenium salts such as ruthenium acetate) in deionized water or organic solvents (ethanol, ether, acetone, chloroform, etc.) to form solution A, weigh an appropriate amount of magnesium acetate and dissolve it in solution A , forming solution B. Wherein, the molar ratio of magnesium to ruthenium ions is 0.5:1-1:10. Weigh an appropriate amount of sucrose (or citric acid, or ethylenediaminetetraacetic acid, or glycine, or an organic complexing agent such as polyvinylpyrrolidone) and dissolve it in solution B to form solution C. Wherein, the ratio of sucrose (or citric acid, or ethylenediaminetetraacetic acid, or glycine, or polyvinylpyrrolidone) to the total molar concentration of ruthenium and magnesium ions is 1:0.5-1:10. Put solution C on a magnetic heating stirrer, heat to evaporate water (or organic solvent), and obtain gel D. Put D in a forced air drying oven at 200 degre...

Embodiment 2

[0062] Preparation method of ultrafine monodisperse PdO:

[0063] Dissolve palladium chloride (or palladium salts such as palladium nitrate) in deionized water or organic solvents (ethanol, ether, acetone, etc.) to form solution A, weigh an appropriate amount of magnesium acetate and dissolve it in solution A to form solution B . Wherein, the molar ratio of magnesium to palladium ions is 0.5:1-1:10. Weigh an appropriate amount of sucrose (or citric acid, or ethylenediaminetetraacetic acid, or glycine, or polyvinylpyrrolidone) and dissolve it in solution B to form solution C. Wherein, the ratio of sucrose (or citric acid, or ethylenediaminetetraacetic acid, or glycine, or polyvinylpyrrolidone) to the total molar concentration of palladium and magnesium ions is 1:0.5-1:10. Put solution C on a magnetic heating stirrer, heat to evaporate water (or organic solvent), and obtain gel D. Put D in a forced air drying oven at 200 degrees Celsius for 4-24 hours to obtain foamy precurso...

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Abstract

A preparation method and application of a battery catalyst. The preparation method includes the following steps: preparing a mixed solution containing precious metals and magnesium ions; adding a complexing agent to the mixed solution to prepare a complex solution; evaporating the volatile components in the complex solution Sexual solvent is used to obtain a gel containing precious metals and magnesium ions; the gel is heat-treated to obtain a foam precursor, and the secondary heat treatment is performed to obtain precious metal / magnesium oxide composite powder or precious metal oxide / magnesium oxide composite powder; the precious metal / magnesium oxide composite powder is obtained. The composite powder or precious metal oxide / magnesium oxide composite powder is added to the etching acid solution and stirred to obtain a turbid liquid; the precious metal powder or precious metal oxide powder is extracted from the turbid liquid. The ultrafine monodisperse nanopowder prepared by the invention has controllable particle size, uniform particle size and high catalytic activity, and is an ideal lithium-oxygen battery catalyst material. The preparation method provided by the invention has the advantages of simple process, low cost, and is conducive to large-scale production.

Description

technical field [0001] The invention relates to a secondary battery, in particular to a preparation method and application of a noble metal or noble metal oxide catalyst for the secondary battery. Background technique [0002] The lithium-oxygen battery has an ultra-high energy density, its theoretical energy density is equivalent to that of gasoline, and its actual energy density can also be several times that of the existing lithium-ion battery. It is expected to be used as an electric vehicle energy storage battery, and can also be used as a stationary storage power station battery. A lithium-oxygen battery cell usually consists of three parts: a lithium negative electrode, an electrolyte, and an oxygen electrode positive electrode. Carbon materials are currently the main catalyst materials for oxygen electrodes because of their low cost, high electronic conductivity and high catalytic activity. Unfortunately, carbon materials and the target product lithium peroxide (Li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92B01J23/44B01J23/46B01J23/50B01J23/52B01J35/00
CPCH01M4/92H01M4/921B01J23/462B01J23/44B01J23/50B01J23/52B01J23/468B01J23/464B01J35/33Y02E60/50
Inventor 韩达翟登云李宝华康飞宇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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