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Preparation method for carbon-coated iron sulfur compound cathode material

A negative electrode material, carbon coating technology, applied in the field of preparation of carbon-coated iron-sulfur composite negative electrode materials, can solve the problems of poor stability and rate performance, low electrical conductivity, material structure damage, etc., to achieve cycle performance and rate performance Excellent, high specific capacity effect

Inactive Publication Date: 2018-11-27
SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, iron-sulfur compounds as anode materials have disadvantages such as low electrical conductivity, polysulfides formed during the cycle are easily dissolved in the electrolyte, and the volume increases during the charge and discharge process, resulting in serious damage to the material structure, resulting in The stability and rate performance are poor, which greatly hinders their application in real life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The soluble iron salt is dissolved in the mixed solution of alcohol and amine to obtain the mixed solution of iron salt, wherein the soluble iron salt is ferric chloride, the alcohol in the mixed solution of alcohol and amine is ethylene glycol, and the amine in the mixed solution of alcohol and amine is Ethylenediamine, wherein the concentration of soluble iron salt in the iron salt mixed solution is 0.0015mmol / L; transfer the iron salt mixed solution to a reaction kettle for solvothermal reaction at 200°C for 10h to obtain ferric alcohol with a special micro-nano hollow sphere structure salt mixture.

[0020] The iron alkoxide mixture is centrifuged, washed with an organic solvent for several times to obtain a light green iron alkoxide with a special micro-nano hollow sphere structure, and then dried in an oven, wherein the organic solvent is absolute ethanol.

[0021] Place the dried iron alkoxide in a tube furnace, raise the temperature to 400°C at a rate of 5°C / min...

Embodiment 2

[0025] The soluble iron salt is dissolved in the mixed solution of alcohol and amine to obtain the mixed solution of iron salt, wherein the soluble iron salt is ferric sulfate, the alcohol in the mixed solution of alcohol and amine is propylene glycol, and the amine in the mixed solution of alcohol and amine is propylene diamine , wherein the concentration of soluble iron salt in the iron salt mixed solution is 0.002mmol / L; the iron salt mixed solution is transferred to a reaction kettle for solvothermal reaction at 250°C for 24 hours to obtain an iron alkoxide mixture with a special micro-nano hollow sphere structure.

[0026] Centrifuge the mixture of iron alkoxides, wash with organic solvents for several times to obtain light green iron alkoxides with a special micro-nano hollow sphere structure, and then dry them in an oven. The organic solvents are absolute ethanol, acetone, cyclohexane , one or more of dimethyl sulfoxide or tetrahydrofuran.

[0027] Place the dried iron ...

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Abstract

The invention discloses a preparation method for a carbon-coated iron sulfur compound cathode material. According to the method, an iron alkoxide hollow ball with a special micro-nano structure is adopted for preparing a high-performance iron sulfur compound under a suitable sulfuring sintering temperature, the iron sulfur compound with higher crystalline degree can be acquired and the lithium storage reaction is benefited. According to the invention, humic acid is used as a cathode material carbon-coating agent, the cathode material is high in specific capacity and the cycle performance and rate capability are excellent.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a method for preparing a carbon-coated iron-sulfur composite negative electrode material. Background technique [0002] In recent years, the domestic new energy automobile industry has developed rapidly, and there are various types of batteries. The market demand and requirements for batteries are gradually increasing. The key indicators it is most concerned about are mainly concentrated in five aspects: safety and stability performance, cycle life, wide temperature resistance, charging speed and energy density. [0003] Metal sulfide pyrite (FeS 2 ) has attracted the attention of researchers for its high energy density (890mAh / g), stable structure, safety, non-toxicity and pollution-free, and low price. It is a very promising anode material for lithium batteries. However, iron-sulfur compounds as anode materials have disadvantages such as low electrical conductivity, polysulfi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5815H01M4/625H01M10/052Y02E60/10
Inventor 不公告发明人
Owner SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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