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Preparation method of carbon-loaded potassium vanadate and application of carbon-loaded potassium vanadate in potassium ion battery

A technology of potassium vanadate and potassium ions, which is applied in the field of preparation of carbon-supported potassium vanadate, can solve problems such as structural transformation, difficulty in realizing effective carbon loading, poor material rate performance, etc., and achieve mass transfer resistance reduction and material effective capacity Improvement, the effect of many reactive sites

Active Publication Date: 2021-06-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its morphology is dominated by nanoribbons / wires, and other morphologies are rare; the bottleneck restricting the practical application of this type of material is mainly due to the fact that this type of material is prone to structural transformation at high temperatures, and it is difficult to achieve the effective carbon of this type of material by synthetic methods. load, resulting in poor rate performance of the material

Method used

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  • Preparation method of carbon-loaded potassium vanadate and application of carbon-loaded potassium vanadate in potassium ion battery
  • Preparation method of carbon-loaded potassium vanadate and application of carbon-loaded potassium vanadate in potassium ion battery

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Experimental program
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Effect test

Embodiment 1

[0037] (NH 4 VO 3 Preparation of KVO by precursor method x @C)

[0038] Weigh 0.5850g NH 4 VO 3Add 0.6303g of oxalic acid dihydrate to a 200mL beaker, add 100ml of deionized water, heat in a water bath at 85°C and stir for 1 hour to obtain a dark blue solution, continue stirring for 4 hours until 20mL of gel is obtained, and dry the resulting mixture in a vacuum oven at 120°C 12h, the obtained solid powder was pre-carbonized at 350°C for 5h in an argon atmosphere, and sintered at 750°C for 8h. The obtained sample was transferred into a 100mL beaker, 3.72g of potassium chloride was weighed and 25mL of deionized water was added, and stirred at room temperature for 72h. The resulting mixture was centrifuged to remove the supernatant, washed 3 times with deionized water and ethanol and centrifuged, and the obtained gray-black powder was dried in a vacuum oven at 120°C for 12 hours to obtain the final product KVO x @C, the particle size range of 200-400nm is characterized by S...

Embodiment 2

[0040] (V 2 o 5 Preparation of KVO by precursor method x @C)

[0041] Weigh 0.4550g V 2 o 5 Add 0.6303g oxalic acid dihydrate into a 200mL beaker, add 100ml deionized water, heat in a water bath at 85°C and stir for 1h to obtain a dark blue solution, continue stirring for 4h until 20mL of gel is obtained, and place the resulting mixture in a vacuum oven at 120°C Dry for 12 hours, pre-carbonize the obtained solid powder at 350°C for 5 hours in an argon atmosphere, sinter at 750°C for 8 hours, transfer the obtained sample into a 100mL beaker, weigh 3.72g of potassium chloride and add 25mL of deionized water, and stir at room temperature for 72h , the resulting mixture was centrifuged to remove the supernatant, washed 3 times with deionized water and ethanol and centrifuged, and the obtained gray-black powder was dried in a vacuum oven at 120°C for 12 hours to obtain the final product KVO x @C, the particle size range of 150-300nm is characterized by SEM test.

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Abstract

The invention relates to a preparation method of carbon-loaded potassium vanadate and an application of the carbon-loaded potassium vanadate in a potassium ion battery. The chemical formula of the carbon-loaded potassium vanadate is KVOx@C, the KVOx@C is obtained by firstly obtaining a V2O3@C precursor through a sol-gel method and then obtaining a final product through high-temperature sintering and room-temperature stirring. The synthesis method is simple and convenient, and the energy consumption is low. According to the method disclosed by the invention, the precursor is of a carbon-coated nano-particle structure, so that the obtained final product is uniformly distributed nano-particles. In the charging and discharging process of the battery, more reaction active sites exist, and the effective capacity of the material can be improved to the maximum extent; in addition, the morphology of the nanoparticles shortens the transmission path of potassium ions in a solid phase, and is beneficial to rapid deintercalation of the potassium ions; meanwhile, the surface carbon layer structure is beneficial to improving electron conduction. The reaction kinetics is improved from the two aspects of ion diffusion and electron transfer, and the battery assembled by the composite material has excellent electrochemical performance.

Description

technical field [0001] The invention relates to the field of positive electrode materials for potassium ion batteries, in particular to a preparation method of carbon-loaded potassium vanadate and its application in potassium ion batteries. Background technique [0002] The storage and utilization of energy plays an important role in the development of society. Fossil energy has occupied the main position in the energy structure for a long time, but at the same time, fossil energy is also facing the problems of resource shortage and environmental pollution. Searching for clean renewable energy is an effective means to solve the shortage of fossil energy and pollution problems. The development and utilization of renewable energy has also begun to attract attention, but the development and utilization of renewable energy has encountered discontinuity, instability, and Network problem. Energy storage technology is the key technology to solve its discontinuous and unstable prob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/054B82Y30/00B82Y40/00
CPCH01M4/362H01M4/485H01M4/62H01M4/625H01M4/628H01M10/054B82Y30/00B82Y40/00Y02E60/10
Inventor 郑琼李先锋凌模翔张华民阎景旺
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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