Cyano complex compounds as well as preparation method and application thereof

A technology of complex compound and cyano group, which is applied in the field of cyano complex compound and its preparation, can solve the problems of poor crystallinity of ferrocyanide, low capacity of sodium ion battery, unsatisfactory cycle stability, etc., and achieve short cycle time, The effect of high capacity and good crystallinity

Active Publication Date: 2017-11-07
ZHEJIANG UNIV
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  • 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

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  • Cyano complex compounds as well as preparation method and application thereof
  • Cyano complex compounds as well as preparation method and application thereof

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[0034] Example 1

[0035] Dissolve ammonium ferrocyanide in deionized water, stir evenly to obtain ferrocyanide ion (Fe(CN) 6 4- ) Solution A with a concentration of 0.1mol / L; add MnCl 2 Dissolve in deionized water to obtain Mn 2+ Calculate the concentration of 0.2mol / L solution B (MnCl 2 The molar ratio with ammonium ferrocyanide is 2.5); Mix solution A and solution B, hydrothermally react at 60°C for 2h, filter, wash, and dry to obtain (NH 4 ) x Mn[Fe(CN)] y Precipitation; NaCl is dissolved in a mixed solvent of ethylene glycol and deionized water (the volume ratio of the two is 90:10) to obtain a solution C with a concentration of 0.2mol / L (the molar ratio of NaCl and ammonium ferrocyanide is 2.5 ), will (NH 4 ) x Mn[Fe(CN)] y Add to solution C, after ultrasonic dispersion, react for 1.5h at 150°C under nitrogen atmosphere, then cool, filter, wash, and dry to obtain the cyano complex compound Na x Mn[Fe(CN)] y . Through ICP analysis, the x value of the product is 1.75, the y va...

Example Embodiment

[0044] Example 2

[0045] Dissolve ammonium ferrocyanide in deionized water, stir 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 Dissolve in deionized water to obtain Mn 2+ And Fe 2+ The total concentration of solution B (MnCl 2 With FeSO 4 The ratio of the total number of moles to the number of moles of ammonium ferrocyanide is 3); Mix Solution A and Solution B, hydrothermally react at 60°C for 2h, filter, wash, and dry to obtain (NH 4 ) x Mn 0.5 Fe 0.5 [Fe(CN)] y Precipitation; NaCl is dissolved in a mixed solvent of ethylene glycol and deionized water (the volume ratio of the two is 90:10) to obtain a solution C with a concentration of 0.4 mol / L (the molar ratio of NaCl and ammonium ferrocyanide is 3 ), will (NH 4 ) x Mn 0.5 Fe 0.5 [Fe(CN)] y Add to solution C, after ultrasonic dispersion, react at 140℃ for 2h under nitrogen atmosphere, then cool, filter, wash and dry to obtain the cyano c...

Example Embodiment

[0047] Example 3

[0048] Dissolve ammonium ferrocyanide in deionized water, stir evenly to obtain ferrocyanide ion (Fe(CN) 6 4- ) Solution A with a concentration of 0.1mol / L; add FeCl 2 Dissolve in deionized water to obtain Fe 2+ Calculate the concentration of 0.2mol / L solution B (FeCl 2 The ratio of moles to ammonium ferrocyanide is 3); Mix solution A and solution B, hydrothermally react at 60℃ for 2h, filter, wash, and dry to obtain (NH 4 ) x Fe[Fe(CN)] y Precipitation; NaCl is dissolved in a mixed solvent of ethylene glycol and deionized water (the volume ratio of the two is 90:10) to obtain a solution C(N) with a concentration of 0.2mol / L a The molar ratio of Cl and ammonium ferrocyanide is 2.5), the (NH 4 ) x Fe[Fe(CN)] y Add to solution C, after ultrasonic dispersion, under nitrogen atmosphere, after reacting at 160℃ for 1 hour, then cooling, filtering, washing and drying, the cyano complex compound Na is obtained x Fe[Fe(CN)] y In the formula, x=1.72, y=0.83; the crystal lat...

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Abstract

The invention discloses a preparation method of cyano complex compounds. The preparation method comprises specific steps as follows: mixing ammonium ferrocyanide with deionized water to obtain a solution A, mixing soluble salt of bivalent transition metal ions M<2+> with the deionized water to obtain a solution B, and mixing the solution A with the solution B to obtain an intermediate product after a hydrothermal reaction; dissolving sodium salt in an ethylene glycol/deionized water mixed solvent to obtain a solution C, and mixing an intermediate product with the solution C to obtain the cyano complex compounds after an ion exchange reaction. The invention discloses the preparation method of the cyano complex compounds. With adoption of the method, the morphology and the lattice structure of the target product can be regulated; the prepared cyano complex compounds have good crystallinity, and can remarkably improve electrochemical performance of sodium ion batteries after being applied to electrodes of the sodium ion batteries.

Description

technical field [0001] The invention relates to the technical field of novel energy storage batteries, in particular to a cyano complex 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 that s...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M10/054C01C3/12
CPCC01C3/12C01P2002/72C01P2004/62C01P2006/40H01M4/364H01M4/58H01M10/054Y02E60/10
Inventor 谢健沈志龙孙云坡曹高劭赵新兵
Owner ZHEJIANG UNIV
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