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A method for in-situ preparing lithium electrode material carbon-encapsulated ferrous sulfide nanoparticles

A negative electrode material, ferrous sulfide technology, applied in the field of materials science, can solve the problems of lengthy process, long-term high-temperature calcination, etc., and achieve the effect of simple post-processing, easy operation, and excellent rate performance

Inactive Publication Date: 2018-12-14
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a method for in-situ preparation of carbon-coated ferrous sulfide nanoparticles for lithium battery negative electrode materials. The method for preparing carbon-coated ferrous sulfide nanoparticles in situ requires Solve the technical problems of long-term high-temperature calcination and lengthy process in the prior art for preparing doped graphite spheres

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0015] A method for in-situ preparation of carbon-coated ferrous sulfide nanoparticles for lithium battery negative electrode materials, comprising the following steps:

[0016] Put the reaction solution of iron source (carbonyl iron), sulfur source (carbon disulfide) and carbon source (methanol) in a mass ratio of 40:10:1 in a volumetric flask; raise the temperature of the tube furnace to the reaction temperature of 500 ° C, and Nitrogen gas was introduced at a flow rate of 16 liters / hour; the reaction solution was input to the injector inside the vertical tube furnace through an electronic peristaltic pump, and sprayed into the high temperature zone of the tube furnace at an input rate of 60 ml / hour, and was mixed with the carrier gas After being taken out of the high-temperature zone of the tube furnace, carbon-coated ferrous sulfide nanoparticles can be obtained in the tail product collector of the main reactor.

[0017] Implementation effect: Hollow carbon spheres with an...

Embodiment 2

[0019] Put the reaction solution of iron source (carbonyl iron), sulfur source (ammonium thiocyanate) and carbon source (ethanol) in a mass ratio of 15:4:1 in a volumetric flask; raise the temperature of the tube furnace to the reaction temperature of 900 ℃, and feed nitrogen with a flow rate of 120 liters / hour; the reaction solution is input to the injector inside the vertical tube furnace through an electronic peristaltic pump, and sprayed into the high temperature zone of the tube furnace at an input rate of 10 ml / hour, and As the carrier gas is taken out of the high-temperature zone of the tube furnace, carbon-coated ferrous sulfide nanoparticles can be obtained in the product collector at the end of the main reactor.

[0020] Implementation effect: Hollow carbon spheres with an average diameter of 40 nm are formed, the wall thickness is 2 nm, and the number of graphite layers is 7; as a lithium battery negative electrode, the specific capacity reaches 1500 mAh / g at a curre...

Embodiment 3

[0022] Put the reaction solution of iron source (carbonyl iron), sulfur source (thiophene) and carbon source (acetone) in a mass ratio of 1:1:20 in a volumetric flask; raise the temperature of the tube furnace to the reaction temperature of 1300 ° C, and Nitrogen gas is introduced at a flow rate of 160 liters / hour; the reaction solution is input to the injector inside the vertical tube furnace through an electronic peristaltic pump, and sprayed into the high temperature zone of the tube furnace at an input rate of 240 ml / hour, and is mixed with the carrier gas After being taken out of the high-temperature zone of the tube furnace, carbon-coated ferrous sulfide nanoparticles can be obtained in the tail product collector of the main reactor.

[0023] Implementation effect: Hollow carbon spheres with a diameter of 100 nm are formed, the wall thickness is 6 nm, and the number of graphite layers is 20; as a lithium battery negative electrode, the specific capacity reaches 500 mAh / g ...

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Abstract

The invention provides a method for in-situ preparing lithium electrode material carbon-encapsulated ferrous sulfide nanoparticles. The method includes weighing iron source, A sulfur source and a carbon source, take an inert gas as a carrier gas, input a raw material solution to an injector in a vertical tube furnace through an electronic peristaltic pump, spray that raw material into a high-temperature region of the tube furnace, thermally decompose the raw material to form nano clusters, carry the raw material out of the high-temperature region of the tube furnace with the carrier gas, and then collect the product at the tail of the tube furnace to obtain carbon-encapsulated ferrous sulfide nano core-shell particles. The nano core-shell particles obtained by the method of the present invention can be used as electrode materials for lithium ion batteries. The method of the invention has the advantages of one-step synthesis of core-shell particles, continuous preparation and easy operation, and has broad prospects in industrial application of electrode materials, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of materials science and relates to a nanometer material, in particular to a method for in-situ preparation of carbon-coated ferrous sulfide nanoparticles for lithium battery negative electrode materials. Background technique [0002] Due to their large specific surface area, flexibility and high mechanical strength, carbon nanomaterials have attracted more and more attention in practical applications. Carbon nanomaterials with doping elements (such as boron, nitrogen, phosphorus, sulfur, etc.), because they can form a p-type or n-type structure, can effectively absorb charges or provide active sites, while improving the conductivity of the material , it is of great application value to apply it to related electronic device materials or battery materials. At present, more sulfur-doped carbon materials have been studied, including activated carbon, carbon nanotubes, carbon nanofibers, graphene, etc., by introducing su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/5815H01M4/625Y02E60/10
Inventor 盛赵旻李娜娜黄欢甘祖忠赵文杰田皓良顾璋杰
Owner SHANGHAI INST OF TECH
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