A new nano-cobalt porous carbon host material for lithium sulfur batteries was developed by Peking University

July 25, 2020

Latest company news about A new nano-cobalt porous carbon host material for lithium sulfur batteries was developed by Peking University

The continuous progress of science and technology has put forward higher requirements for lithium ion battery technology, especially in the field of large-scale energy storage such as electric vehicles, which requires new lithium ion battery with higher energy density and lower price. Among them, lithium sulfur battery as a kind of multi-electron reaction lithium ion battery, its energy density (2600Wh/kg) and price advantage is far higher than the current lithium iron phosphate and lithium cobalt oxide commercial batteries, so it has attracted wide attention. However, there are a series of problems in the charging and discharging process, such as poor conductivity of elemental sulfur, shuttle effect of intermediate polysulfide, volume expansion in the charging and discharging process. At present, researchers have proposed a series of optimization strategies for the host materials of sulfur positive electrode, such as improving the conductivity of sulfur positive electrode through porous carbon and improving the adsorption of polysulfide through nitrogen doping. However, the effects obtained by various means are limited and the problem cannot be fundamentally solved. Therefore, a more effective positive electrode host material combining various functions is needed.

 

A new nano-cobalt porous carbon host material for lithium sulfur batteries was developed by Peking University

A new lithium-sulfur battery material

 

Recently, the institute of Peking University shenzhen graduate school of the new material Pan Feng clean energy center research group led by professor one MOF material was prepared based on the common responsibility of cobalt nanocrystals nitrogen doped porous carbon cage as a new type of lithium battery of host materials, through its excellent electrochemical performance characterization testing found, and by including XRD, SEM, TEM, XPS, and a variety of means such as DFT calculation reveals the reasons of performance, illuminates the Co nanocrystals, polysulphide adsorption dynamics of the lithium ion diffusion and transformation of the positive role, for the preparation of new type of lithium battery cathode material provides a train of thought. The work was recently published in Advanced Energy Materials (2020,10 (9), 1903550, IF=24.884), a well-known journal in the field of Energy Materials.

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The novelty of this work is that the research team USES zNCO-MOF with high specific surface area to adsorb glucose small molecules, and then during the carbonization process, glucose is preferentially carbonized into SP2 structure carbon frame in the MOF cavity to isolate cobalt metal and enhance electrical conductivity. At the same time, an appropriate amount of sulfur can enable -- 87 wt% of active sulfur material to be loaded in the carbon cage rather than on the surface, so that sulfur and carbon cage skeleton maintain a strong interaction. Team preparation of cobalt nanocrystals with high dispersion bear the load of nitrogen doping of porous carbon cage how sulfide to sulfur active materials and intermediates with multifunctional effect, including the improvement of electrical conductivity, high sulfur content, stress relieving, the speeding up of the lithium ion diffusion dynamics, catalytic polysulphide rapid transformation and strong adsorption of polysulfide intermediates and so on, they can ensure that lithium sulfur batteries high ratio of performance and long cycle life.

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A new nano-cobalt porous carbon host material for lithium sulfur batteries was developed by Peking University
Electrochemical properties of a new lithium - sulfur composite anode material

At the same time, a series of studies have shown that the highly dispersed Co nanocrystals carried in the skeleton can not only effectively promote the diffusion of lithium ions and the REDOX of polysulfide, but also further enhance the absorption of polysulfide. This work provides a new reference for transition metals as high performance catalysts for polysulfide in lithium sulfur batteries.

 

This work was completed under the guidance of Pan Feng. The co-first authors of this paper were doctoral student Wang Rui and postdoctoral fellow Yang Jinlong, and teacher Xiao Yinguo and Teacher Pan Feng were the co-corresponding authors. This work has been supported by the National Key Research and Development Program of Materials genetic Engineering, the Key Laboratory of Guangdong Province and the Science and Technology Innovation Commission of Shenzhen

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