A kind of cyano coordination compound and its preparation method and application

A technology of coordination compound and cyano group, which is applied in the direction of ferricyanide, metal cyanide, structural parts, etc., can solve the problems of unsatisfactory cycle stability, low capacity of sodium ion battery, poor crystallinity of ferrocyanide, etc., and achieve Good crystallinity, high capacity, and short cycle time

Active Publication Date: 2019-04-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] But also because of this, the prepared ferrocyanide generally has poor crystallinity, which leads to the low capacity and unsatisfactory cycle stability of the sodium-ion battery assembled as the positive electrode material.

Method used

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  • A kind of cyano coordination compound and its preparation method and application
  • A kind of cyano coordination compound and its preparation method and application

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Experimental program
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Embodiment 1

[0035] Potassium ferrocyanide was dissolved in deionized water, stirred evenly to obtain ferrocyanide ion (Fe(CN) 6 4- ) meter concentration is the solution A of 0.1mol / L; MnCl 2 Dissolved in deionized water to obtain Mn 2+ Solution B (MnCl 2 The molar ratio of potassium ferrocyanide to potassium ferrocyanide is 2.5); mix solution A and solution B, undergo a hydrothermal reaction at 60°C for 2 hours, filter, wash, and dry to obtain K x Mn[Fe(CN)] y Precipitation; NaCl is dissolved in the mixed solvent of ethylene glycol and deionized water (the volume ratio of the two is 90:10) to obtain a concentration of 0.2mol / L solution C (the mol ratio of NaCl and potassium ferrocyanide is 2.5 ), the K x Mn[Fe(CN)] y Add it into solution C, after ultrasonic dispersion, under nitrogen atmosphere, react at 150°C for 1.5h, then cool, filter, wash, and dry to obtain the nanostructured cyano coordination compound Na x Mn[Fe(CN)] y . Through ICP analysis, the x value of the product is ...

Embodiment 2

[0045] Potassium ferrocyanide was dissolved in deionized water, stirred evenly to obtain ferrocyanide ion (Fe(CN) 6 4- ) solution A with a concentration of 0.2mol / L; MnCl with a molar ratio of 1:1 2 and FeSO 4 Dissolved in deionized water to obtain Mn 2+ and Fe 2+ Solution B (MnCl 2 with FeSO 4 The ratio of the total moles of potassium ferrocyanide to the moles of potassium ferrocyanide is 3); solution A and solution B are mixed, subjected to hydrothermal reaction at 60°C for 2 hours, filtered, washed and dried to obtain K x mn 0.5 Fe 0.5 [Fe(CN)] y Precipitation; NaCl is dissolved in the mixed solvent of ethylene glycol and deionized water (the volume ratio of the two is 90:10) to obtain a concentration of 0.4mol / L solution C (the mol ratio of NaCl and potassium ferrocyanide is 3 ), the K x mn 0.5 Fe 0.5 [Fe(CN)] y Add it into solution C, after ultrasonic dispersion, under nitrogen atmosphere, react at 140°C for 2 hours, then cool, filter, wash and dry to get the...

Embodiment 3

[0048] Potassium ferrocyanide was dissolved in deionized water, stirred evenly to obtain ferrocyanide ion (Fe(CN) 6 4- ) meter concentration is solution A of 0.1mol / L; FeCl 2 dissolved in deionized water to obtain Fe 2+ Solution B (FeCl 2 The molar ratio of potassium ferrocyanide to potassium ferrocyanide is 3); solution A and solution B are mixed, subjected to hydrothermal reaction at 60°C for 2 hours, filtered, washed and dried to obtain K x Fe[Fe(CN)] y Precipitation; NaCl is dissolved in the mixed solvent of ethylene glycol and deionized water (the volume ratio of the two is 90:10) to obtain a concentration of 0.2mol / L solution C (the mol ratio of NaCl and potassium ferrocyanide is 2.5 ), the K x Fe[Fe(CN)] y Add it into solution C, after ultrasonic dispersion, react at 160°C for 1 hour under nitrogen atmosphere, then cool, filter, wash, and dry to obtain the nanostructured cyano coordination compound Na x Fe[Fe(CN)] y , where, x=1.62, y=0.78; the lattice structure...

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Abstract

The invention discloses a preparation method of a cyanogroup coordination compound. The preparation method specifically comprises the following steps: mixing potassium ferrocyanide with deionized water, thus obtaining a solution A, mixing soluble salt of a bivalent transitional metal ion M<2+> with the deionized water, thus obtaining a solution B, mixing the solution A with the solution B, and performing hydrothermal reaction, thus obtaining an intermediate product; dissolving soluble sodium salt in an ethanediol / deionized mixed solvent, thus obtaining a solution C, mixing the intermediate product with the solution C, and performing ion exchange reaction, thus obtaining the cyanogroup coordination compound. The invention discloses a preparation method of the cyanogroup coordination compound. According to the preparation method, the shape and the lattice structure of a target product can be regulated and controlled, so that the prepared cyanogroup coordination compound is high in crystallinity; when the cyanogroup coordination compound is applied to a sodium-ion battery electrode, the electrochemical property of the sodium-ion battery can be obviously improved.

Description

technical field [0001] The invention relates to the technical field of new energy storage batteries, in particular to a cyano coordination compound and its preparation method and application. Background technique [0002] Lithium-ion batteries are now widely used in mobile electronic devices, such as smartphones, laptops, etc., and have huge markets in grid energy storage, electric vehicles. However, with the popularization of lithium-ion batteries, especially large-scale use in electric vehicles, the consumption of lithium resources is also huge. However, the reserves of lithium resources are limited, and there is currently no effective and economical technology for the recovery of lithium elements in waste lithium-ion batteries. In contrast, the reserves of sodium on the earth are much higher than that of lithium, and the price is much lower than that of lithium. Therefore, in recent years, sodium-ion batteries have attracted much attention. It is generally believed tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C3/12H01M4/58
CPCC01C3/12C01P2002/72C01P2004/62C01P2006/40H01M4/58Y02E60/10
Inventor 谢健沈志龙孙云坡曹高劭赵新兵
Owner ZHEJIANG UNIV
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