Nitrogen-doped barbed carbon nanosphere/sulfur composite material and preparation method and application thereof

A technology of carbon nanospheres and composite materials, applied in the fields of nanomaterials and electrochemical energy, can solve the problem that it is impossible to determine whether sulfur is outside or inside the hollow sphere, the conductivity of sulfur cannot be greatly improved, and the utilization of active materials can be reduced. rate and other problems, to achieve the effect of low cost of raw materials and equipment, enhanced physical adsorption, and improved electrical activity
CN110797522AActive Publication Date: 2020-02-14WENZHOU UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
WENZHOU UNIVERSITY
Publication Date
2020-02-14

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Abstract

The invention discloses a nitrogen-doped barbed carbon nanosphere / sulfur composite material and a preparation method and application thereof. The composite material comprises sulfur and nitrogen-dopedbarbed carbon nanospheres serving as a sulfur host material, wherein the carbon nanosphere is formed by combining a plurality of nitrogen-doped needle-like carbon fibers according to a spherical shape, the lengths of the carbon fibers are different, all the carbon fibers are shot from the spherical edge to the spherical center to form barbed distribution, gaps exist between the carbon fibers, andthe carbon fibers are gathered to the center to form a cavity. Furthermore, 60-75wt% of sulfur supported by the nitrogen-doped barbed carbon nanospheres is applied to a lithium-sulfur battery as a positive electrode. Sufficient space is provided for sulfur volume expansion in the charging and discharging process by utilizing the internal cavity and the carbon fiber gaps; the carbon fibers with different lengths in the spheres can well disperse sulfur and adsorb polysulfide, so that the sulfur utilization rate is increased, and the polysulfide loss is inhibited; and the loss of polysulfide ions can be more effectively inhibited by doping carbon in the outer layer of nitrogen atoms, thereby effectively prolonging the cycle life of the lithium-sulfur battery and improving the capacity of thelithium-sulfur battery.
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Description

technical field

[0001] The invention belongs to the field of nanometer materials and electrochemical energy, and specifically refers to a nitrogen-doped barbed carbon nanosphere / sulfur composite material and its preparation method and application. Background technique

[0002] Lithium-sulfur secondary batteries have shown great application advantages in future electrochemical energy storage devices. However, the insulation of the sulfur cathode, the Li generated during charging and discharging 2 S n The capacity is still lower than the theoretical value due to the easy dissolution, loss and volume expansion of sulfur in the electrolyte, and the poor rate performance and cycle stability limit the development and wide application of lithium-sulfur batteries. A lot of valuable research work has been done to improve the above-mentioned difficult problems.

[0003] Among them, carbon-sulfur composites based on nanostructures have been considered as one of the effective methods ...

Claims

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