Carbon-sulfur composite material, preparation method thereof and lithium-sulfur battery

A technology of composite materials and composite methods, which is applied in the field of sulfur-carbon composite materials and their preparation, can solve problems such as poor electrical properties, achieve good adsorption and catalytic functions, increase sulfur loading capacity, and good electrical conductivity

Pending Publication Date: 2022-05-27
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, when the existing carbon-sulfur composite materials use these two methods to reduce the proportion of inactive

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  • Carbon-sulfur composite material, preparation method thereof and lithium-sulfur battery
  • Carbon-sulfur composite material, preparation method thereof and lithium-sulfur battery
  • Carbon-sulfur composite material, preparation method thereof and lithium-sulfur battery

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[0057] Example

[0058] A carbon-sulfur composite material, comprising a porous carbon matrix and sulfur particles supported in situ with metals and their compounds, composed of figure 1 It can be seen that the porous carbon matrix is ​​composed of interconnected nano-carbon particles, and the sulfur particles are dispersed among the nano-carbon particles, and the sulfur particles are partially filled in the pores of the porous carbon matrix and partially covered on the surface of the nano-carbon particles; it can be seen from the XRD analysis ( figure 2 ), the metals and their compounds are Co and Co 2 O 3 A mixture of Co and Co 2 O 3 The particle size of the sulfur particles is 50-80nm, and the weight content of the sulfur particles in the carbon-sulfur composite material is 90%; the particle size of the nano-carbon particles is 20-50nm; the porous carbon The matrix is ​​a hierarchical porous carbon matrix; the porous structure of the hierarchical porous carbon matrix i...

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Abstract

The invention provides a carbon-sulfur composite material which comprises a high-porosity porous carbon matrix loaded with a small amount of one or more than two metals and/or metal compounds of Co, Fe, Ni, Cr, Mn and Zn in situ, and sulfur particles, a three-dimensional interconnected electron conduction path with a rich interface and a rapid ion diffusion channel are constructed through high-porosity graded porous carbon, pores of a porous carbon matrix are partially filled with sulfur particles, the surfaces of nano carbon particles are partially coated with sulfur particles, electrons and lithium ions are in full contact with active sulfur at the interface, and the active sulfur and the lithium ions are in full contact. The carbon-sulfur composite material has the advantages that the utilization rate of sulfur is increased, the mechanical stability of an electrode is improved, a small amount of metal and/or compounds are uniformly dispersed among the nano carbon particles, effective chemical adsorption is performed on polysulfide, meanwhile, electrochemical conversion of lithium polysulfide to Li2S2/Li2S is promoted, and the electrochemical performance of the carbon-sulfur composite material is improved.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur batteries, and in particular relates to a sulfur-carbon composite material supporting an in-situ catalyst, a preparation method thereof, and a lithium-sulfur battery. Background technique [0002] In lithium-sulfur batteries, elemental sulfur is used as the positive electrode material, with a theoretical specific capacity of 1675mAh / g. Using metal lithium as the negative electrode, the theoretical specific energy density reaches 2600Wh / kg, which is the energy density that can be achieved by current commercial lithium-ion batteries (LIBs). In addition, it has the advantages of low cost and no pollution, and is regarded as a new generation of high energy density energy storage system with great potential. However, elemental sulfur and its discharge product Li still exist in lithium-sulfur batteries. 2 The problems of poor S conductivity, severe volume expansion and contraction during charging and disc...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/50H01M4/52H01M4/583H01M10/052
CPCH01M4/366H01M4/362H01M4/38H01M4/483H01M4/502H01M4/523H01M4/583H01M10/052H01M2004/028Y02E60/10
Inventor 王丹琴刘双科洪晓斌郑春满李宇杰许静谢威
Owner NAT UNIV OF DEFENSE TECH
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