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Method of producing a sodium iron(II)-hexacyanoferrate(II) material

A technology of hexacyanoferrate, iron acid, applied in chemical instruments and methods, ferricyanide, iron compounds, etc., to achieve the effect of minimizing energy cost

Active Publication Date: 2019-05-03
ALTRIS AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Recent developments in Na-ion battery technology have addressed the problem of sufficient Na-ion loading capacity in the positive electrode.

Method used

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  • Method of producing a sodium iron(II)-hexacyanoferrate(II) material
  • Method of producing a sodium iron(II)-hexacyanoferrate(II) material
  • Method of producing a sodium iron(II)-hexacyanoferrate(II) material

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Embodiment Construction

[0041] Production of ferric (II) sodium (Na) hexacyanoferrate (II) according to the present invention 2-y Fe[Fe(CN) 6 ].mH 2 O where y is less than x and preferably less than 0.2) method comprising two stages: (A) Na 4 Fe(CN) 6 The acid decomposes and dries into powder material, and (B) the sodium content of enriched powder material, Na 2-x Fe[Fe(CN) 6 ].mH 2 O, where x<0.4. The method according to the invention for producing a positive electrode for a sodium battery comprises a further stage (C) of forming an electrode comprising a sodium-enriched powder material.

[0042] The first stage (A) of the method according to the invention comprises Na 4 Fe(CN) 6 .10H 2 Acid decomposition of O, which is known in the art. However, it is a significant aspect that the chemical reactions taking place during the method according to the invention are carried out below 100°C and at or near ambient pressure. The reaction starts with Na 4 Fe(CN) 6 .10H 2 Acid decomposition of O...

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Abstract

The present invention relates to a method of producing a sodium iron(ll)- hexacyanoferrate(ll) (Na2-xFe[Fe(CN)6].mH2O), where x is < 0.4) material commonly referred to as Prussian White. The method comprises the steps of acid decomposition of Na4Fe(CN)6.10H2O to a powder of Na2-xFe[Fe(CN)6].mH2O, drying and enriching the sodium content in the Na2-xFe[Fe(CN)6].mH2O powder by mixing the powder witha saturated or supersaturated solution of a reducing agent containing sodium in dry solvent under an inert gas. The steps of acid decomposition and enriching the sodium content are performed under non-hydrothermal conditions.

Description

technical field [0001] The present invention relates to a method for producing iron(II) sodium hexacyanoferrate(II) material and an apparatus comprising iron(II) sodium hexacyanoferrate(II) material. In particular, the present invention relates to a method of producing high voltage and high capacity positive electrodes for sodium ion batteries comprising sodium iron(II) hexacyanoferrate(II) material. Background technique [0002] Li-ion based batteries dominate the rechargeable battery market. However, this technique has disadvantages, at least Li resources are relatively scarce. While better than previous-generation secondary battery technology, Li-ion-based batteries are not environmentally friendly and expensive from a recycling perspective. Sodium-ion batteries represent an attractive alternative to lithium-ion batteries and are arguably the most viable method of supporting renewable energy for load balancing and storing excess energy. However, to be commercially viab...

Claims

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Application Information

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IPC IPC(8): C01C3/12H01M4/58
CPCC01C3/12H01M4/5825H01M10/054Y02E60/10H01M4/58C01G49/009C01P2002/72C01P2004/03C01P2006/40H01M4/587H01M2004/028
Inventor 威廉·布兰特龙尼·莫根森雷扎·尤内西费雷斯·德赫沙尔
Owner ALTRIS AB
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