Tunable and scalable synthesis of hierarchical porous nanocarbon/sulfur composite cathodes

A technology of graded porous and porous carbon, applied in battery electrodes, electrical components, non-aqueous electrolyte batteries, etc., can solve the problems of difficult high rate performance and high power output, low degree of graphitization of CNF, poor electrical conductivity, etc.

Pending Publication Date: 2019-03-01
THE HONG KONG UNIV OF SCI & TECH
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Problems solved by technology

[0010] 1. CNFs evolved from direct carbonization of electrospun polymer precursors often exhibit poor electrical conductivity due to their lower degree of graphitization
[0011] 2. In addition, the vast majority of pores generated in CNFs are completely open or completely closed, which makes it difficult to con

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  • Tunable and scalable synthesis of hierarchical porous nanocarbon/sulfur composite cathodes
  • Tunable and scalable synthesis of hierarchical porous nanocarbon/sulfur composite cathodes
  • Tunable and scalable synthesis of hierarchical porous nanocarbon/sulfur composite cathodes

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Embodiment Construction

[0023] The hierarchical porous CNF with excellent characteristics is used to prepare advanced porous CNF / sulfur composite cathodes with high rate performance and long cycle life. This CNF / sulfur composite cathode is obtained by controlling the content of the sacrificial agent / catalyst, the conditions of chemical activation, and optimizing the melt-diffusion method for the infiltration of sulfur particles.

[0024] The present invention describes a method for synthesizing HPCNF / S composite materials using the electrospinning method and the melt-diffusion method. It should be noted that the preparation methods of hierarchical porous carbon nanofibers (HPCNF) and hierarchical porous carbon nanofibers / sulfur (HPCNF / S) and porous carbon fiber / sulfur (PCNF / S) composites are quite different. Generally, HPCNF / S composites are formed by adding sulfur to hierarchical porous carbon nanofibers (HPCNF).

[0025] The HPCNF successfully prepared by electrospinning has a high specific surface are...

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Abstract

Hierarchical porous carbon nanofiber/sulfur composites (HPCNF/S), useful in the manufacture of lithium sulfur batteries are formed of a cathode having a hierarchical porous carbon nanofiber/sulfur (HPCNF/S) composite, a conductive additive, polyvinylidene fluoride binder and a foil current collector. The HPCNF is formed by electrospinning polyacrylonitrile/iron (III) acetylacetonate neat fibers from polymer precursor, stabilizing, carbonizing and acid etching to form porous CNFs, effecting chemical activation of porous CNF to form hierarchical porous carbon nanofibers (HPCNFs) and effecting encapsulation of sulfur in pores of HPCNFs by melt-diffusion. When used as a battery, the HPCNF/Scomposite functions as a cathode.

Description

[0001] Related application [0002] This patent application claims the priority of provisional patent application No. 62 / 493462 filed on July 6, 2016, which is assigned to the assignee of this application and submitted by the inventor, and its content is incorporated by reference Into this article. Technical field [0003] The invention relates to the synthesis of hierarchical porous carbon nanofibers (HPCNF) and a method for preparing hierarchical porous carbon nanofiber / sulfur (HPCNF / S) composite materials. In particular, the present disclosure relates to the application of HPCNF / S composite material as a cathode in a rechargeable lithium-sulfur battery (LSB). Background technique [0004] The ever-growing portable electronic device market requires energy storage systems with high energy / power density, long cycle performance, low cost and environmentally friendly characteristics. Among many electrochemical energy storage devices, lithium-ion batteries have occupied the electroni...

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Application Information

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IPC IPC(8): H01M4/62
CPCH01M4/136H01M4/364H01M4/5815H01M4/625H01M10/052Y02E60/10
Inventor 金章教徐正龙黄荐楸张雯琪秦显营王翔宇
Owner THE HONG KONG UNIV OF SCI & TECH
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