Preparation method of Fe7S8@C nanorod materials applied to high performance lithium ion batteries

A technology of lithium-ion batteries and nanorods, which is applied in the field of preparation of nano-negative electrode materials, can solve the problems of poor cycle and rate performance, low conductivity, and no nano-transition metal sulfides have been obtained, and achieve good rate performance, simple formula, Effect of Material Structure Rules

Active Publication Date: 2019-03-08
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many during the period: the synthesis of Fe by electrochemical deposition 7 S 8 , hydrothermal synthesis of Fe 7 S 8 , solvothermal synthesis of Fe 7 S 8 , Synthesis of Fe by mechanical ball milling 7 S 8 etc. However, due to the disadvantages of low electrical conductivity, volume expansion during charge and discharge cycles, and the dissolution of active materials in the electrolyte, the cyclability and rate performance are relatively poor.
[0003] At present, there are two types of methods to solve this kind of problem: one involves nanostructure materials, which use nanoeffects to increase the diffusion rate of lithium ions and electron transmission. Transition metal sulfide; the second is to prepare carbon / metal sulfide composite materials, and improve the electrochemical performance of the material by taking advantage of the excellent ion and electronic conductivity of carbon materials

Method used

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  • Preparation method of Fe7S8@C nanorod materials applied to high performance lithium ion batteries
  • Preparation method of Fe7S8@C nanorod materials applied to high performance lithium ion batteries
  • Preparation method of Fe7S8@C nanorod materials applied to high performance lithium ion batteries

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Embodiment 1

[0033] Fe that can be applied to high-performance lithium-ion batteries 7 S 8 The preparation method of @C nanorod material, it comprises the following steps:

[0034] a. In a PTFE-lined stainless steel autoclave, add Fe(NH 4 ) 2 ·(SO 4 ) 2 ·6H 2 O and thiourea, the mass ratio of the two is 1:2, then add deionized water, hydrazine hydrate and tetraethylenepentamine, and hydrothermally treat at 160 ° C for 24 hours, the deionized water, hydrazine hydrate and tetraethylenepentamine The volume ratio is 5:5:6; after the autoclave is cooled to room temperature, the sample is collected by centrifugation at a speed of 8000r / min with a high-speed centrifuge, washed several times with deionized water and absolute ethanol, and finally placed in the sample Dry in a constant temperature oven for 8 hours; the black powder obtained is Fe 7 S 8 Precursors of nanorods.

[0035] b, through the N 2 Calcination of Fe at 350°C in atmosphere 7 S 8 Nanorod precursors for 2 hours to prep...

Embodiment 2

[0041] Fe that can be applied to high-performance lithium-ion batteries 7 S 8 The preparation method of @C nanorod material, it comprises the following steps:

[0042] a. In a 100ml Teflon-lined stainless steel autoclave, add 4.5mmol Fe(NH 4 ) 2 ·(SO 4 ) 2 ·6H 2 O and 7.5mmol thiourea, then add 10ml deionized water, 20ml hydrazine hydrate and 45ml tetraethylenepentamine, hydrothermal treatment at 160°C for 24 hours. After the autoclave was cooled to room temperature, the sample was collected by centrifugation at a speed of 8000r / min with a high-speed centrifuge, washed several times with deionized water and absolute ethanol, and finally dried in a constant temperature oven for 8 hours to obtain black powder is Fe 7 S 8 Precursors of nanorods.

[0043] b, through the N 2 Calcination of Fe at 350°C in atmosphere 7 S 8 Nanorod precursors for 2 hours to prepare Fe 7 S 8 nanorods, the resulting black powder is Fe 7 S 8 Nano stave.

[0044] c. Add 400mg Fe 7 S 8 N...

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Abstract

The invention relates to the technical field of preparation of nano negative electrode materials, in particular to a preparation method of Fe7S8@C nanorod materials applied to high performance lithiumion batteries. The method comprises the following steps: 1) preparing a Fe7S8 precursor by hydrothermal method; 2) obtaining a high-purity Fe7S8 nanorod by heat treatment; 3) performing organic layercoating on the prepared Fe7S8 by a solution method to prepare a Fe7S8@PDA nanorod; and 4) performing heat treatment on the prepared Fe7S8@PDA nanorod to carbonize the organic matter to obtain a Fe7S8@C nanorod, finally fabricating the obtained Fe7S8@C nanorod into a button cell, and performing electrochemical test. The invention has the advantages of simple formula, simple operation, good repeatability, high purity of the product, rich raw materials, environment-friendly type, regular material structure and good stability, and has high capacity and good rate performance as the negative electrode material.

Description

technical field [0001] The invention relates to the technical field of preparation of nanometer negative electrode materials, in particular to Fe which can be applied to high-performance lithium-ion batteries 7 S 8 Preparation method of @C nanorod material. Background technique [0002] Iron sulfide and its high energy density, safety and non-toxicity, stable structure and low price have attracted the attention of researchers. With the continuous development of science and technology, Fe 7 S 8 The preparation methods of Fe are also constantly being innovated, and various methods are constantly crossing, infiltrating, learning from each other, and preparing many Fe with excellent performance. 7 S 8 particles. There are many during the period: the synthesis of Fe by electrochemical deposition 7 S 8 , hydrothermal synthesis of Fe 7 S 8 , solvothermal synthesis of Fe 7 S 8 , Synthesis of Fe by mechanical ball milling 7 S 8 However, due to the disadvantages of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y40/00
CPCH01M4/366H01M4/5815H01M4/625H01M4/628H01M10/0525B82Y40/00Y02E60/10
Inventor 姚卫棠张群斌戴金延廖敏吴丽芬杨蒙蒙段涛
Owner SOUTHWEAT UNIV OF SCI & TECH
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