Nano-rod porous carbon-sulfur composite cathode material, preparation method thereof and lithium-sulfur battery

A composite positive electrode material and porous carbon technology, applied in the field of lithium-ion batteries, can solve the problems that the polysulfide shuttle effect cannot be well resolved, polysulfides cannot be bound in the positive electrode area, and the conductivity of the sulfur electrode is poor. Suppression of the shuttle effect, improvement of electrochemical performance, and low cost effects

Active Publication Date: 2016-09-07
CHANGSHA RES INST OF MINING & METALLURGY
View PDF4 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The porous structure, good conductivity and mechanical properties of carbon materials have better solved the problems of poor conductivity and volume expansion of sulfur electrodes, but the shuttle effect of polysulfides is still not well resolved.
Theory proves that when the pore size is small enough (about 1nm), the porous carbon material will have a strong binding effect on pol...

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
  • Nano-rod porous carbon-sulfur composite cathode material, preparation method thereof and lithium-sulfur battery
  • Nano-rod porous carbon-sulfur composite cathode material, preparation method thereof and lithium-sulfur battery
  • Nano-rod porous carbon-sulfur composite cathode material, preparation method thereof and lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A nanorod porous carbon-sulfur composite positive electrode material of the present invention, the positive electrode material is a composite material of nanorod porous carbon and sublimated sulfur, the sublimated sulfur is located in the nanorod porous carbon channel, and the mass ratio of sublimated sulfur to nanorod porous carbon is The ratio is 2:1, the pore diameter of nanorod porous carbon is 1nm~3nm, the length is 800nm, and the diameter is 50nm; the specific surface area of ​​nanorod porous carbon is 1800m 2 / g, the pore volume is 2.5 cm 3 / g.

[0034] The preparation method of the nanorod porous carbon-sulfur composite cathode material of this embodiment comprises the following steps:

[0035] (1) Dissolve 0.594g of zinc nitrate hexahydrate in 20ml of deionized water to make an aqueous solution, add 0.562g of 4,4'-biphenyldicarboxylic acid disodium salt (dilute 4,4'-biphenyldicarboxylic acid and NaOH according to molar A neutralization reaction occurs in an a...

Embodiment 2

[0043] A nanorod porous carbon-sulfur composite positive electrode material of the present invention, the positive electrode material is a composite material of nanorod porous carbon and precipitated sulfur, the precipitated sulfur is located in the pores of the nanorod porous carbon, and the mass ratio of the precipitated sulfur to the nanorod porous carbon is 3:1, the pore diameter of nanorod porous carbon is 1nm~3nm, the length is 500nm, and the diameter is 30nm; the specific surface area of ​​nanorod porous carbon is 2000 m 2 / g, the pore volume is 2.8cm 3 / g.

[0044] The preparation method of the nanorod porous carbon-sulfur composite cathode material of this embodiment comprises the following steps:

[0045] (1) Dissolve 0.594g of zinc nitrate hexahydrate in 30ml of deionized water to make an aqueous solution, dissolve 0.562g of 4,4'-biphenyl dicarboxylic acid disodium salt in 30ml of deionized water to make an aqueous solution, and then mix the two The aqueous soluti...

Embodiment 3

[0051] A nanorod porous carbon-sulfur composite positive electrode material of the present invention, the positive electrode material is a composite material of nanorod porous carbon and sublimated sulfur, the sublimated sulfur is located in the nanorod porous carbon channel, and the mass ratio of sublimated sulfur to nanorod porous carbon is 4:1, the pore diameter of nanorod porous carbon is 1nm~3nm, the length is 800nm, and the diameter is 40nm; the specific surface area of ​​nanorod porous carbon is 1400 m 2 / g, the pore volume is 2.3cm 3 / g.

[0052] The preparation method of the nanorod porous carbon-sulfur composite cathode material of this embodiment comprises the following steps:

[0053] (1) Dissolve 1.188g of zinc nitrate hexahydrate in 15ml of deionized water to make an aqueous solution, dissolve 1.144g of 4,4'-biphenyl dicarboxylic acid disodium salt in 15ml of deionized water to make an aqueous solution, and then mix the two The aqueous solution was mixed and st...

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

PropertyMeasurementUnit
Apertureaaaaaaaaaa
Lengthaaaaaaaaaa
Diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method of a nano-rod porous carbon-sulfur composite cathode material. The preparation method comprises the steps of mixing a zinc nitrate hexahydrate solution with 4,4'-biphenyl dicarboxylic acid disodium salts at a normal temperature; then centrifugally washing and drying the mixture to obtain a zinc-based metal organic framework precursor; roasting the precursor in inert gas atmosphere; mixing obtained nano-rod porous carbon with elemental sulfur; ball-grinding and drying the mixture and then carrying out thermal treatment so as to obtain the nano-rod porous carbon-sulfur composite cathode material. The prepared nano-rod porous carbon-sulfur composite cathode material is a composite material of the nano-rod porous carbon and the elemental sulfur and has the pore diameter of 1 nm-3 nm, and the elemental sulfur is located in the pore passages of the nano-rod porous carbon. The material is low in preparation cost and small in pore diameter, has the strong binding effect on the polysulfide, can effectively inhibit the shuttling effect and improve the electrochemical performance of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a nanorod porous carbon-sulfur composite cathode material, a preparation method thereof, and a lithium-sulfur battery. Background technique [0002] At present, commercial lithium-ion batteries can no longer meet the specific capacity and specific energy requirements of electric vehicles and other products for power batteries. As a new type of electrochemical energy storage system, lithium-sulfur (Li-S) battery has a theoretical specific energy of up to 2600Wh / kg. As a positive electrode material, sulfur has a theoretical specific capacity of more than 1600mAh / g, and sulfur has abundant reserves and low price. , Environmental friendliness and other advantages, has a very high application value. However, there are still many problems to be solved in order to realize the practical application of lithium-sulfur batteries. First of all, sulfur is an insulator, and a c...

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): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/364H01M4/38H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 钱昕晔靳黎娜沈湘黔赵迪杨晓龙王善文习小明周友元廖达前黄承焕姚山山
Owner CHANGSHA RES INST OF MINING & METALLURGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap