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Rod-like structure sodium iron sulfide material and preparation method thereof

A rod-shaped structure, iron sulfur technology, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of reducing Coulombic efficiency, increasing electrolyte side reactions, etc., and achieve the effect of high initial capacity and high stability

Active Publication Date: 2020-05-29
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, nanostructured electrode materials with high specific surface area can increase the side reactions of the electrolyte and reduce the Coulombic efficiency

Method used

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  • Rod-like structure sodium iron sulfide material and preparation method thereof
  • Rod-like structure sodium iron sulfide material and preparation method thereof
  • Rod-like structure sodium iron sulfide material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0028] Select a preferred implementation of a rod-like structure sodium iron sulfide material and sodium iron sulfide material, including the following preparation steps:

[0029] (1) The molar percentages of the prepared raw materials are: 20% of hematite, 50% of sodium acid pyrophosphate, and 30% of sulfate;

[0030] (2) After adding the raw materials into ultrapure water and stirring evenly, transfer them to the reaction kettle;

[0031] (3) The product is washed with ultrapure water and dried;

[0032] (4) The product is sintered at 100° C. for 6 hours under the protection of nitrogen to obtain the product.

[0033] Such as figure 2 As shown, after XRD diffraction of the product obtained by sintering at 100°C for 6 hours, the characteristic peaks at 33° and 35° are very weak, indicating that under this condition, the crystallinity of the product is very poor.

Embodiment 2

[0035] Select a preferred implementation of a rod-like structure sodium iron sulfide material and sodium iron sulfide material, including the following preparation steps:

[0036] (1) The molar percentages of the prepared raw materials are: 20% of hematite, 50% of sodium acid pyrophosphate, and 30% of sulfate;

[0037] (2) After adding the raw materials into ultrapure water and stirring evenly, transfer them to the reaction kettle;

[0038] (3) The product is washed with ultrapure water and dried;

[0039] (4) The product is sintered at 400° C. for 6 hours under nitrogen protection to obtain the product.

[0040] Such as figure 2 As shown, the product obtained by sintering at 400°C for 6 hours has strong characteristic peaks at 33° and 35° after XRD diffraction, indicating that the crystallinity of the product is very good under this condition. Such as Figure 4 It is shown that under the same electrochemical cycle test conditions, the initial discharge specific capacity ...

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Abstract

The invention provides a rod-like structure sodium iron sulfide material and a preparation method thereof. The prepared sodium iron sulfide material is high in stability and high in initial capacity,the maximum initial capacity is 2288 mAh g<-1>, and the results show that the sodium iron sulfide material has potential application in an energy storage material. The sodium iron sulfide material canbe used as an electrode material and an electrolyte material of energy storage batteries, for example, the material can be applied to electrodes and electrolytes of energy storage batteries such as sodium ion batteries, lithium ion batteries, potassium ion batteries, aluminum ion batteries, lead-acid batteries, supercapacitors and the like. The material can also be used as an important componentof solar batteries, and can be possibly applied to the field of biological medicines in the future.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a bar-shaped sodium iron sulfur material and a preparation method thereof. Background technique [0002] At present, wind power, hydropower, nuclear energy, etc. have received more and more attention, and the progress of power generation technology has led to the continuous decline of power reserves in peak seasons, which has promoted the vigorous development of energy storage materials. The research and development of new energy materials will promote the rapid development of the energy field to a certain extent. [0003] To stabilize the electrodes and shorten the diffusion length of Na ions, many strategies adopted in Li batteries are inspiring the design of Na battery electrodes, including nanonization and preparation of composite materials. Nanostructured materials exhibit two effects: (1) the "tiny size effect", which depends on the reduction in the diameter of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B82Y40/00
CPCC01G49/009B82Y40/00C01P2004/16C01P2006/40C01P2004/03C01P2002/72Y02E60/10
Inventor 代汗清陈媛媛张国旗郭睿倩叶怀宇
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA