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A cathode material for sodium ion battery and a preparation method thereof

A technology for sodium ion batteries and positive electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems that the coating agent does not have the reactivity of the positive electrode material, and cannot enhance the conductivity of the composite material, so as to improve the sodium storage capacity and Cycling stability, the effect of improving the cycling stability, and increasing the electrical conductivity

Active Publication Date: 2019-01-25
GUANGDONG BRUNP RECYCLING TECH +1
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  • Application Information

AI Technical Summary

Problems solved by technology

The most commonly used surface modification method is generally the surface coating of metal oxides, such as aluminum oxide, titanium oxide, magnesium oxide, etc. Although it can improve the cycle performance of the Prussian blue positive electrode to a certain extent, the coating agent itself There is no reactivity as a positive electrode material, nor can it enhance the conductivity of the composite material, and they sacrifice capacity for structural stability, so it is urgent to find suitable surface modification materials to meet the joint improvement of composite material cycle stability and capacity

Method used

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  • A cathode material for sodium ion battery and a preparation method thereof
  • A cathode material for sodium ion battery and a preparation method thereof
  • A cathode material for sodium ion battery and a preparation method thereof

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preparation example Construction

[0028] A method for preparing a sodium ion battery cathode material. The iron salt is dissolved in a fluorine-containing ionic liquid, and the resulting mixed solution is stirred with a carbon source and a Prussian blue-type sodium ion cathode material to perform a solvothermal reaction to obtain iron-based fluorine Prussian blue-based composite sodium ion battery cathode material is modified by in-situ coating of compound and carbon.

[0029] Preferably, in the preparation method, the mass ratio of the Prussian blue-based sodium ion cathode material, the iron salt and the carbon source is 1:(0.01-0.5):(0.01-0.5); further preferably, the Prussian blue-based sodium ion cathode material, The mass ratio of the iron salt and the carbon source is 1: (0.01-0.2): (0.1-0.5).

[0030] Preferably, in the preparation method, the iron salt is a trivalent iron salt; further preferably, the iron salt is ferric nitrate; still further, the iron salt is Fe(NO 3 ) 3 ·9H 2 O.

[0031] Preferably, in t...

Embodiment 1

[0043] Na 4 Fe(CN) 6 ·10H 2 O is the raw material, and FeCl 2 ·4H 2 O and complexing agent sodium citrate are dissolved in deionized water at room temperature and reacted. After washing and drying, Na is synthesized 1.7 FeFe(CN) 6 Prussian blue-based sodium ion cathode material.

[0044] Take 0.5gFe(NO 3 )·9H 2 O dissolved in 15mL ionic liquid [BMIM][BF 4 ], then add 0.5g Super-P and 2gNa to the mixed yellow solution 1.7 FeFe(CN) 6 The mixed powder, stir for 2min, put it in 100℃ for solvothermal 12h, after natural cooling, wash with absolute ethanol and acetone, and dry to obtain FeF 3 ·0.5H 2 O and Super-P in situ coated Na 1.7 FeFe(CN) 6 Composite cathode material for sodium ion battery.

Embodiment 2

[0046] Na 4 Fe(CN) 6 ·10H 2 O is the raw material, and FeCl 3 ·6H 2 O reacts under hydrothermal conditions and is washed and dried to synthesize NaFeFe(CN) 6 Prussian blue-based sodium ion cathode material.

[0047] Take 0.6gFe(NO 3 )·9H 2 O dissolved in 20mL ionic liquid [BMIM][BF 4 ], then add 0.4g Ketjen Black and 2gNaFeFe(CN) to the mixed yellow solution 6 The mixed powder, stirred for 1 min, put into 60 ℃ for solvent heating for 6 hours, after natural cooling, washed with absolute ethanol and acetone, dried to obtain FeF 3 ·0.33H 2 NaFeFe(CN) coated in situ with O and Ketjen Black 6 Composite cathode material for sodium ion battery.

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Abstract

The invention discloses a positive electrode material of a sodium ion battery and a preparation method thereof. cathode material of the sodium ion battery, The preparation method comprises the following steps of: dissolving iron salt in a fluorinated ionic liquid, stirring the obtained mixed solution with a carbon source, a Prussian blue sodium ion cathode material, and carrying out solvothermal reaction to obtain an iron-based fluoride and carbon in-situ coating modified Prussian blue composite sodium ion battery cathode material. The invention can effectively improve the sodium storage capacity and cycle stability of the sodium ion battery composite material, and can also increase the conductivity of the sodium ion battery composite material through a simple in-situ coating process of the iron-based fluoride and the carbon source.

Description

Technical field [0001] The invention relates to a sodium ion battery cathode material and a preparation method thereof, and belongs to the technical field of new energy batteries. Background technique [0002] Recently, due to the successful commercialization of lithium-ion batteries, sodium-ion batteries of the same main family have also attracted the attention of researchers. Compared with lithium-ion batteries, sodium-ion batteries have a wide range of raw materials, sodium, and low prices, and the distribution of resources is not restricted by region, so it has great resource and cost advantages. As a sodium ion cathode material with a clear three-dimensional open structure, Prussian blue can provide large ion channels to facilitate the rapid insertion and extraction of sodium ions. It also has a high charge and discharge platform, high energy density, low cost, and easy preparation. , Environment-friendly and other advantages, these advantages determine that it can well mee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/58H01M4/582H01M4/625H01M10/054Y02E60/10
Inventor 许帅军阮丁山唐胜贺
Owner GUANGDONG BRUNP RECYCLING TECH
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