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A method for modifying Prussian blue and its analogues and a sodium ion battery

A technology of Prussian blue and its analogs is applied in the modification of Prussian blue and its analogs, and the application field of sodium-ion batteries, which can solve the problems of fast decay of electrochemical performance of Prussian blue, unfavorable industrial applications, and easy water absorption again. Achieve the effects of good cycle stability, improved storage stability and low cost

Active Publication Date: 2018-12-21
张五星
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dehydrated Prussian blue is easy to absorb water again when stored in the air, and the electrochemical performance of Prussian blue after water absorption decays quickly, so it is not conducive to industrial applications.

Method used

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  • A method for modifying Prussian blue and its analogues and a sodium ion battery
  • A method for modifying Prussian blue and its analogues and a sodium ion battery
  • A method for modifying Prussian blue and its analogues and a sodium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1: the modification of Fe-PBAs by glacial acetic acid

[0037] Specifically include the following steps:

[0038] S1: Take 4mmol of Na 4 Fe(CN) 6 10H 2 O was dissolved in 200ml deionized water to form solution A; take 6mmol of FeSO 4 ·7H 2 O and 15g sodium citrate were dissolved in 200ml deionized water to form solution B;

[0039] S2: Then pour solution A into solution B, and let the mixed solution stand at room temperature (25° C.) for 6 hours;

[0040] S3: Pour off the upper clear liquid after the reaction is completed, and centrifuge and wash the obtained white precipitate three times with deionized water and absolute ethanol;

[0041] S4: Dry in a blast oven at 80°C for 12 hours to obtain aqueous Na 1.54 Fe[Fe(CN) 6 ] 0.96 (Fe-PBAs);

[0042] S5: dehydrating it at 0.1mTorr and 100°C for 30 hours to obtain dehydrated Fe-PBAs;

[0043] S6: Soak the dehydrated Fe-PBAs in anhydrous acetic acid for 12 hours, filter and dry in vacuum at 70° C. to obt...

Embodiment 2

[0046] Embodiment 2: the modification of Mn-PBAs by isopropanol

[0047] Specifically include the following steps:

[0048] S1: Take 4mmol of Na 4 Fe(CN) 6 4H 2 O was dissolved in 100ml deionized water to form solution A; take 6mmol of MnCl 2 4H 2 O and 15g sodium citrate were dissolved in 100ml deionized water to form solution B;

[0049] S2: Then solution B was slowly added dropwise to solution A, and the mixed solution was left to stand at room temperature (25° C.) for 6 hours.

[0050] S3: Pour off the upper clear liquid after the reaction is completed, and centrifuge and wash the obtained precipitate three times with deionized water and absolute ethanol respectively.

[0051] S4: Dry in a blast oven at 80°C for 12 hours to obtain aqueous Na x Mn[Fe(CN) 6 ]·zH 2 O(Mn-PBAs).

[0052] S5: dehydrating it at 100° C. for 30 hours in a vacuum of 0.1 mTorr to obtain dehydrated Mn-PBAs.

[0053] S6: Soak the dehydrated Mn-PBAs in anhydrous isopropanol for 12 hours, filt...

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PUM

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Abstract

The invention discloses a modification method of Prussian blue and its analogues (PBAs), includes the following steps: S1: Synthetic aqueous Prussian blue and its analogues, S2, dehydrating the PBAs synthesized in S1 under a certain vacuum degree and drying temperature; S3, contacting the PBAs obtained in S2 with an anhydrous organic solvent; S4, separating the PBAs modified in S3 from the solvent, and drying to obtain the final product. The invention also discloses a modified Prussian blue and the like. The invention also discloses a sodium ion battery. The surface of dehydrated PBAs is modified by organic matter, When the organic molecules occupy the position of crystalline water, the storage stability of PBAs at ambient temperature and pressure is greatly improved while the electrochemical performance of sodium storage of PBAs is improved, thus solving the problem that dehydrated PBAs are easy to absorb water again when stored in air.

Description

technical field [0001] The invention belongs to the technical field of Prussian blue and its analogs, and more specifically relates to a modification method of Prussian blue and its analogs and their application in sodium-ion batteries. Background technique [0002] Na-ion batteries have the characteristics of low raw material cost, abundant resources, and great electrochemical performance potential, so they are expected to be applied in the field of large-scale energy storage, and are one of the important research directions of next-generation battery technology. At present, the cathode materials of sodium-ion batteries mainly include transition metal oxides, phosphates, and Prussian blue materials. Among them, Prussian blue materials have higher voltage platform (>3V), large ion channels, and large specific capacity (~170mAh g -1 ), cheap, non-toxic and easy to prepare, and become a research hotspot of cathode materials for sodium-ion batteries. [0003] Prussian blue...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/054
CPCH01M4/58H01M10/054Y02E60/10
Inventor 张五星杨凌霄薛丽红
Owner 张五星
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