Preparation method of iron-sulfur negative electrode material for lithium battery

A negative electrode material, lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor contact, carbon electrode structure changes, material structure damage, etc., to prevent powder agglomeration and improve conductivity.

Inactive Publication Date: 2018-11-23
SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, graphitized carbon materials are the main anode materials for lithium-ion batteries, but carbon materials have the following shortcomings: (1) SEI film is formed during the first discharge process, causing irreversible capacity loss, and even causing internal structural changes and poor contact of carbon electrodes; (2) ) Due to the decomposition of the protective layer at high temperature, the battery will fail or cause a safety accident; (3)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 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.

[0024] 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.

[0025] Place the dried iron alkoxide in a tube furnace, raise the temperature to 400°C at a rate of 5°C / min...

Embodiment 2

[0030] 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.

[0031] 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.

[0032] Place the dried iron ...

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PUM

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Abstract

The invention discloses a preparation method of an iron-sulfur negative electrode material for a lithium battery. The method comprises the following steps of preparing a high-performance iron-sulfur compound at a proper vulcanization sintering temperature by adopting ferrite hollow spheres with a special micro-nano structure, so that the iron-sulfur compound with relatively high crystallinity canbe obtained, and a lithium-storage reaction is facilitated; through carbon-nitrogen compounding, the conductivity of the active substance is improved; and in addition, a cavity between a nitrogen-doped carbon layer and the iron-sulfur compound provides an effective space for volume expansion in an active substrate intercalation/de-intercalation lithium process, so that pulverization agglomerationof the iron-sulfur compound is prevented.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a method for preparing an iron-sulfur negative electrode material for a lithium battery. 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] Today, lithium-ion batteries play an increasingly important role in social development. Therefore, the development of high-performance, green and environmentally friendly electrode materials has become a research hotspot for lithium-ion batteries. At present, graphitized carbon materials are the main anode materials for lithium-ion batteries, but carbon material...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5815H01M4/624H01M4/625H01M4/626H01M10/0525Y02E60/10
Inventor 不公告发明人
Owner SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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