Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of FeS/RGO nano composite sodium-ion battery negative electrode material

A sodium ion battery and negative electrode material technology, applied in the field of electrochemistry, can solve the problems of low conductivity, electrode material shedding, volume expansion, etc., achieve cycle and rate performance improvement, simple preparation method, and improve conductivity.

Inactive Publication Date: 2017-07-25
SHAANXI UNIV OF SCI & TECH
View PDF2 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lack of high electrical conductivity, poor interfacial compatibility with organic electrolytes, large microscopic size of electrode materials, and low utilization of active sites for effective charge and discharge greatly hinder its ability to electrochemically store sodium.
Secondly, after the first discharge, the sulfide reacts with sodium, resulting in volume expansion and a large stress, which makes the active material gradually pulverized during the cycle, causing the electrode material to fall off, thereby losing electrochemical activity.
At the same time, due to the high resistivity of FeS, the voltage drops rapidly during discharge, especially when the battery is discharged with a large current, it will cause serious polarization, which greatly shortens the working life of the battery.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of FeS/RGO nano composite sodium-ion battery negative electrode material
  • Preparation method of FeS/RGO nano composite sodium-ion battery negative electrode material
  • Preparation method of FeS/RGO nano composite sodium-ion battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Dissolve commercially available graphene oxide in deionized water to prepare a 2mg / mL solution, and use an ultrasonic generator to sonicate for 12 hours at a power of 300W to form a uniformly dispersed suspension of graphene oxide, which is referred to as suspension A ;

[0029] 2) Add 1g of analytically pure iron acetylacetonate to 50mL of acetone, ultrasonicate for 10min with a power of 300W, wait until the iron acetylacetonate is fully dissolved, then add it to suspension A to prepare a mixed solution of iron salt and graphene oxide , wherein the volume ratio of deionized water and acetone is 1:1, the concentration of iron acetylacetonate is 10 mg / mL, and the concentration of graphene oxide is 1 mg / mL, which is recorded as mixed solution B;

[0030] 3) Stir and heat the mixed solution B prepared above, the stirring rate is 140r / min, the heating temperature is 100°C, heat and evaporate the solution until the remaining amount is 50mL, that is, the acetone is complet...

Embodiment 2

[0037] 1) Dissolve commercially available graphene oxide in deionized water to prepare a 1mg / mL solution, and use an ultrasonic generator to sonicate for 12 hours at a power of 300W to form a uniformly dispersed suspension of graphene oxide, which is referred to as suspension A ;

[0038] 2) Add 1g of analytically pure iron acetylacetonate to 50mL of acetone, ultrasonicate for 30min with a power of 300W, wait until the iron acetylacetonate is fully dissolved, then add it to suspension A to prepare a mixed solution of iron salt and graphene oxide , wherein the volume ratio of deionized water and acetone is 1:1, the concentration of iron acetylacetonate is 10mg / mL, and the concentration of graphene oxide is 0.5mg / mL, which is recorded as mixed solution B;

[0039] 3) Stir and heat the mixed solution B prepared above, the stirring rate is 140r / min, the heating temperature is 100°C, heat and evaporate the solution until the remaining amount is 50mL, that is, the acetone is complet...

Embodiment 3

[0044] 1) Dissolve commercially available graphene oxide in deionized water to prepare a 1.5mg / mL solution, and use an ultrasonic generator to sonicate for 12 hours at a power of 300W to form a uniformly dispersed suspension of graphene oxide, which is recorded as the suspension A;

[0045] 2) Add 2g of analytically pure iron acetylacetonate into 50mL of acetone, sonicate for 20min with a power of 300W, wait until the iron acetylacetonate is fully dissolved, then add it to suspension A to prepare a mixed solution of iron salt and graphene oxide , wherein the volume ratio of deionized water and acetone is 1:1, the concentration of iron acetylacetonate is 20mg / mL, and the concentration of graphene oxide is 0.75mg / mL, which is recorded as mixed solution B;

[0046] 3) Stir and heat the mixed solution B prepared above, the stirring rate is 140r / min, the heating temperature is 70°C, heat and evaporate the solution until the remaining amount is 50mL, that is, the acetone is completely...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a preparation method of an FeS / RGO nano composite sodium-ion battery negative electrode material. The preparation method comprises the following steps: dissolving oxidized graphene into deionized water to prepare a solution, and carrying out ultrasonic treatment to obtain a turbid liquid in which the oxidized graphene is dispersed uniformly; adding ferric acetylacetonate into acetone, carrying out ultrasonic treatment until the ferric acetylacetonate is dissolved, and then adding the solution into the turbid liquid to obtain a mixed solution of ferric salt and the oxidized graphene; heating and evaporating the mixed solution of ferric salt and the oxidized graphene until the acetone is completely evaporated, and carrying out heating vulcanization after freeze drying. According to the preparation method, the oxidized graphene is creatively introduced into the battery negative electrode material, through the control in the heating vulcanization process, the crystallization behavior of transition metal sulfide is changed, namely generated ferric sulfide particles or sheets are stably anchored on the oxidized graphene layer through heating vulcanization to form a novel composite structure, volume expansion of sodium ions in insertion and extraction process is relieved, the pulverization of the material is inhibited, and the cycling stability is improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a preparation method of a FeS / RGO nanocomposite sodium ion battery negative electrode material. Background technique [0002] In recent years, due to the wide distribution and abundant reserves of sodium in the earth, the research and development of room temperature sodium-ion charge-discharge batteries has been considered to replace lithium-ion batteries in large-scale energy storage, especially in the fields of smart grids, to effectively solve the problem of lithium-ion batteries. An effective approach to the problem of low battery mineral reserves and high cost of lithium sources. Among the many anode material systems for sodium-ion batteries, carbon, metal oxides or sulfides, and alloy materials such as Sn and Sb are the most concerned types of material systems by scholars. Among them, metal sulfides are potential negative electrode materials for sodium...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y40/00
CPCB82Y40/00H01M4/362H01M4/5815H01M4/62H01M4/625H01M4/628H01M10/054Y02E60/10
Inventor 李嘉胤郭鹏辉黄剑锋徐雅白晋英齐慧曹佩陈春露
Owner SHAANXI UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com