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
CN112952047AActive Publication Date: 2021-06-11DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Publication Date
2021-06-11

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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.
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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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