Prussian blue sodium ion battery positive electrode material and preparation method thereof

A technology for sodium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve problems such as low initial Na+ content, achieve high Na+ content, and improve cycle stability , the effect of improving the crystal morphology

Pending Publication Date: 2020-11-17
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved in the present invention is to overcome the Prussian blue material prepared by the existing co-precipitation method and have a lower initial Na when used as the positive electrode material of the sodium ion battery. + content, thereby providing a kind of Prussian blue sodium-ion battery positive electrode material and preparation method thereof

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  • Prussian blue sodium ion battery positive electrode material and preparation method thereof
  • Prussian blue sodium ion battery positive electrode material and preparation method thereof
  • Prussian blue sodium ion battery positive electrode material and preparation method thereof

Examples

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Embodiment 1

[0043] This embodiment provides a method for preparing the positive electrode material of Prussian blue sodium-ion battery, comprising the following steps:

[0044] Dissolve 2mmol sodium ferrocyanide decahydrate and 8mmol sodium citrate in 100mL deionized water to obtain precursor solution A;

[0045] Dissolve 2mmol ferrous chloride tetrahydrate and 8mmol sodium citrate in 100mL deionized water to obtain precursor solution B;

[0046] Such as figure 1 As shown, quickly pour precursor solution A and precursor solution B into the reaction container and mix evenly, then add 100mL methyl benzoate, heat and keep the temperature constant at 90°C, pass N into the methyl benzoate 2 As protective atmosphere, N 2 The flow rate is 20ml / min, standing and aging for 2h;

[0047] The suspension in the reaction vessel was centrifuged at 8000 rpm for 5 min to obtain a precipitate. The precipitate was washed with deionized water, absolute ethanol and acetone three times each. The washed pr...

Embodiment 2

[0052] This embodiment provides a method for preparing the positive electrode material of Prussian blue sodium-ion battery, comprising the following steps:

[0053] Dissolve 0.5mmol sodium ferrocyanide decahydrate and 5mmol sodium citrate in 100mL deionized water to obtain precursor solution A;

[0054] Dissolve 0.5 mmol of manganous sulfate tetrahydrate and 5 mmol of sodium citrate in 100 mL of deionized water to obtain Precursor B;

[0055] Such as figure 1 As shown, quickly pour precursor solution A and precursor solution B into the reaction vessel and mix well, then add 100mL carbon tetrachloride, keep the temperature constant at 25°C, pass Ar into carbon tetrachloride as a protective atmosphere, Ar The flow rate is 50ml / min, and it is left to age for 48h;

[0056] The suspension in the reaction vessel was centrifuged at 3000 rpm for 15 min to obtain a precipitate. The precipitate was washed with deionized water, absolute ethanol and acetone three times each. The washe...

Embodiment 3

[0061] This embodiment provides a method for preparing the positive electrode material of Prussian blue sodium-ion battery, comprising the following steps:

[0062] Dissolve 10mmol sodium ferrocyanide decahydrate and 30mmol disodium edetate in 100mL deionized water to obtain precursor solution A;

[0063] Dissolve 10mmol nickel nitrate hexahydrate and 30mmol edetate disodium in 100mL deionized water to obtain precursor solution B;

[0064] Such as figure 1 As shown, quickly pour precursor solution A and precursor solution B into the reaction vessel and mix well, then add 100mL carbon tetrachloride, keep the temperature constant at 50°C, and pass N into the carbon tetrachloride 2 As protective atmosphere, N 2 The flow rate is 100ml / min, standing and aging for 24h;

[0065] The suspension in the reaction vessel was centrifuged at 15000 rpm for 3 min to obtain a precipitate. The precipitate was washed with deionized water, absolute ethanol and acetone three times each. The w...

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Abstract

The invention provides a preparation method of a prussian blue sodium ion battery positive electrode material, which comprises the following steps: adding a slow-release agent into a precursor solution A and a precursor solution B, slowly releasing ferrous ions and transition metal ions in the process of mixing and reacting the precursor solution A and the precursor solution B, and forming a competitive relationship with the transition metal ions by the slow-release agent and ferrocyanide radicals. The reaction kinetics is greatly reduced, and the control on the reaction rate is realized. Theslow reaction greatly enhances the crystallinity of the material, can improve the morphology of the Prussian blue crystal, and reduces the generation of vacancies and the introduction of coordinationwater and crystal water. When the sodium-ion battery positive electrode material is used as a sodium-ion battery positive electrode material, a sodium-ion battery has relatively high initial Na<+> content and good stability and rate capability.

Description

technical field [0001] The invention relates to the technical field of energy materials, in particular to a positive electrode material for a Prussian blue sodium-ion battery and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of electric vehicles, large-scale energy storage power stations and smart grids, the demand for lithium-ion batteries is increasing. However, due to the limited lithium resources, it is particularly important to develop new electrochemical energy storage systems. Among them, sodium-ion batteries are very promising due to similar performance and the same working principle as lithium-ion batteries. The development of sodium-ion batteries is mostly limited by cathode materials. The anode materials for sodium-ion batteries mainly include layered transition metal oxides, polyanionic compounds, and Prussian blue analogues. Among them, Prussian blue analogues can achieve fast and reversible deintercala...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/12H01M4/58H01M10/054B82Y30/00B82Y40/00
CPCC01C3/12H01M4/58H01M10/054B82Y30/00B82Y40/00C01P2004/03C01P2004/61C01P2006/40C01P2004/62C01P2004/64Y02E60/10
Inventor 白会涛盛鹏徐丽赵广耀姜银珠
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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