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Preparation method and application of high-entropy Prussian blue sodium ion battery positive electrode material

A sodium-ion battery and Prussian blue technology, which is applied in the field of preparation of cathode materials for high-entropy Prussian blue sodium-ion batteries, can solve problems such as difficulty in comprehensively improving battery cycle stability, and achieve improved charge-discharge specific capacity and reaction, and stable crystal structure. The effect of improving the property and stabilizing the crystal structure

Pending Publication Date: 2022-07-29
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, the technical problem to be solved in the present invention is to overcome the defects that the sodium ion battery prepared by the one-component Prussian blue compound is difficult to comprehensively improve battery cycle stability, specific capacity and voltage in the prior art, thereby providing a high-entropy Prussian blue sodium Preparation method and application of positive electrode material for ion battery

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  • Preparation method and application of high-entropy Prussian blue sodium ion battery positive electrode material
  • Preparation method and application of high-entropy Prussian blue sodium ion battery positive electrode material
  • Preparation method and application of high-entropy Prussian blue sodium ion battery positive electrode material

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Embodiment 1

[0028] The present embodiment provides a method for preparing a positive electrode material for a high-entropy Prussian blue sodium-ion battery, comprising the following steps:

[0029] 1) 40mmol Na 4 Fe(CN) 6 ·10H 2 O, 14.7g of sodium citrate and 0.2g of polyvinylpyrrolidone were added to 20mL of deionized water to obtain a solution of sodium ferrocyanide, sodium citrate and surfactant;

[0030] 2) 4mmol of ferrous sulfate, 4mmol manganese sulfate, 4mmol cobalt sulfate, 4mmol nickel sulfate, 4mmol copper sulfate and 14.7g sodium citrate are dissolved in 20ml deionized water to form the solution of transition metal salt and sodium salt;

[0031] 3) adding the solution of transition metal salt and sodium salt obtained in step 2) into the solution of sodium ferrocyanide, sodium citrate and surfactant obtained in step 1) and mixing, stirring reaction, and stirring reaction temperature is 90 ℃. ℃, the stirring time is 2h, the stirring speed of the stirring reaction is 500rpm, a...

Embodiment 2

[0034] The present embodiment provides a method for preparing a positive electrode material for a high-entropy Prussian blue sodium-ion battery, comprising the following steps:

[0035] 1) 20mmol Na 4 Fe(CN) 6 ·10H 2 O, 7.5g sodium citrate and 0.2g 1,4-butynediol were added into 20mL deionized water to obtain a solution of sodium ferrocyanide, sodium citrate and surfactant;

[0036] 2) 4mmol of ferrous sulfate, 4mmol manganese sulfate, 4mmol cobalt sulfate, 4mmol nickel sulfate, 4mmol copper sulfate and 7.5g sodium citrate are dissolved in 20ml deionized water to form the solution of transition metal salt and sodium salt;

[0037]3) adding the solution of transition metal salt and sodium salt obtained in step 2) into the solution of sodium ferrocyanide, sodium citrate and surfactant obtained in step 1) and mixing, stirring reaction, and the stirring reaction temperature is 80 ℃. ℃, the stirring time is 1h, and the stirring speed of the stirring reaction is 400rpm. After the...

Embodiment 3

[0039] The present embodiment provides a method for preparing a positive electrode material for a high-entropy Prussian blue sodium-ion battery, comprising the following steps:

[0040] 1) 60mmol Na 4 Fe(CN) 6 ·10H 2 O, 22.05g sodium citrate and 0.2g polyvinyl alcohol were added into 20mL deionized water to obtain a solution of sodium ferrocyanide, sodium citrate and surfactant;

[0041] 2) 4mmol ferrous sulfate, 4mmol manganese sulfate, 4mmol cobalt sulfate, 4mmol nickel sulfate, 4mmol copper sulfate and 22.05g sodium citrate are dissolved in 20ml deionized water to form the solution of transition metal salt and sodium salt;

[0042] 3) the solution of transition metal salt and sodium salt obtained in step 2) is added to the solution of sodium ferrocyanide, sodium citrate and surfactant obtained in step 1) and mixed, and the stirring reaction is carried out at a temperature of 100 ℃. ℃, the stirring time is 3h, the stirring speed of the stirring reaction is 600rpm, after t...

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Abstract

The invention relates to the field of preparation of electrode materials, in particular to a preparation method and application of a high-entropy Prussian blue sodium-ion battery positive electrode material. The preparation method of the high-entropy Prussian blue sodium-ion battery positive electrode material provided by the invention comprises the following steps: mixing a solution of transition metal salt and sodium salt with a solution of sodium ferrocyanide, sodium citrate and a surfactant, stirring for reaction, standing for aging, filtering, washing and drying to obtain the high-entropy Prussian blue sodium-ion battery positive electrode material, wherein metal ions in the transition metal salt are divalent iron ions, divalent manganese ions, divalent cobalt ions, divalent nickel ions and divalent copper ions; the concentration of the sodium citrate in the solution of the sodium ferrocyanide, the sodium citrate and the surfactant is 120-3000 mmol / L. When the material obtained by the preparation method is applied to the sodium-ion battery, the cycling stability, the specific capacity and the voltage of the sodium-ion battery can be comprehensively improved.

Description

technical field [0001] The invention relates to the field of electrode material preparation, in particular to a preparation method and application of a positive electrode material for a high-entropy Prussian blue sodium ion battery. Background technique [0002] In recent years, the research on the use of Prussian blue as an electrode material for sodium-ion batteries has gradually deepened. As a metal-organic framework material, Prussian blue is a simple coordination polymer with tunable chemical composition and physical properties. However, the monovalent Prussian blue compound has caused some insurmountable problems due to its own physicochemical properties. For example, in Fe-based Prussian blue, too low average voltage is a problem that cannot be solved by pure iron-based Prussian blue; Mn, Co, and Cu-based Prussian blue materials are seriously affected by the ginger-Taylor effect due to the corresponding transition metal elements. The dissolution of transition metals...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F19/00H01M4/36H01M4/60H01M4/62H01M10/054
CPCC07F19/005H01M4/362H01M4/60H01M4/62H01M4/628H01M10/054H01M2004/028H01M2004/021
Inventor 薛晴李慧徐丽
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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