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Prussian blue cathode material, preparation method thereof, and electrochemical energy storage device

A positive electrode material, Prussian blue technology, applied in the field of energy storage devices, can solve problems such as low solubility, different particle sizes, and collapse of the chemical skeleton structure

Active Publication Date: 2021-05-11
CONTEMPORARY AMPEREX TECH CO
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] However, the solubility of Prussian blue and its derivatives in aqueous solution is extremely low, and the reaction speed of metal cyanide and free metal cations in the liquid phase is extremely fast. It is difficult to control the nucleation and crystal growth rate during the preparation process, resulting in the co-precipitation of Prussian blue. The particle sizes of blue and its derivatives are different, and the interparticle agglomeration is serious. At the same time, there are many defects in the product, such as holes, interstitial water and complex water.
The inhomogeneity of the physical and chemical properties of Prussian blue and its derivatives will cause the collapse of the skeleton structure storing sodium ions during the electrochemical cycle, resulting in low Coulombic efficiency of sodium-ion batteries and rapid charge-discharge capacity decay. There may even be a capacity "diving" phenomenon

Method used

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  • Prussian blue cathode material, preparation method thereof, and electrochemical energy storage device
  • Prussian blue cathode material, preparation method thereof, and electrochemical energy storage device
  • Prussian blue cathode material, preparation method thereof, and electrochemical energy storage device

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[0023] The preparation method of the Prussian blue positive electrode material according to the second aspect of the present application is used to prepare the Prussian blue positive electrode material described in the first aspect of the present application, comprising the steps of: (1) dissolving the additive and the M metal salt in a solvent, Form a complex of M metal salt and additives, and then add an alkaline solution to adjust the pH value to 2 to 6 to obtain solution 1; (2) dissolve the hexacyanometallic salt formed by metal M' and metal A in a solvent, Solution 2 is obtained; (3) Solution 1 is slowly added dropwise to Solution 2 to obtain a mixed solution, and after a certain reaction time, aging is obtained to obtain a precipitate, which is washed and dried to obtain a molecular formula of A x m c [M'(CN) 6 ] y Prussian blue cathode material, where A is H + , Li + 、Na + 、K + , NH 4 + One or more of them, M is a transition metal, M' is a transition metal, 0<x≤...

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Abstract

The present application provides a Prussian blue cathode material, a preparation method thereof, and an electrochemical energy storage device. The molecular formula of the Prussian blue cathode material is A x M c [M'(CN) 6 ] y , where A is H + , Li + , Na + , K + , NH 4 + One or more of them, M is a transition metal, M' is a transition metal, 0

Description

technical field [0001] The present application relates to the field of energy storage devices, in particular to a Prussian blue positive electrode material, a preparation method thereof, and an electrochemical energy storage device. Background technique [0002] In recent years, with the rapid development of energy storage technology, sodium-ion batteries have become a hot spot in the research of electrochemical energy storage technology because of their rich resources, environmental friendliness and low cost; and their cathode materials are one of the key factors restricting the application of sodium-ion batteries . Prussian blue and its derivatives have a suitable open frame structure, which can be Na + It provides fast-transporting ion channels and is an excellent cathode material for sodium-ion batteries. [0003] However, the solubility of Prussian blue and its derivatives in aqueous solution is extremely low, and the reaction speed of metal cyanide and free metal cat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/054
CPCH01M4/58H01M4/624H01M10/054Y02E60/10
Inventor 刘倩郭永胜苏硕剑王莹王喜庆梁成都
Owner CONTEMPORARY AMPEREX TECH CO
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