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Preparation method of double-layer porous carbon nanofibers for lithium-sulfur batteries and method for preparing positive electrode materials using the same

A lithium-sulfur battery and nanofiber technology, applied in battery electrodes, nanotechnology, circuits, etc., can solve problems such as poor structural stability, and achieve the effects of alleviating volume changes, excellent conductive channels, and inhibiting dissolution

Active Publication Date: 2019-04-16
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the shell includes microporous carbon and nanoscale sulfur, which can act as a physical barrier to the polysulfide shuttling effect, and it stabilizes the volume of the positive electrode of the battery (Z. Li, Y. Jiang, L. Yuan, Z.Yi, C.Wu, Y.Liu, P.Strasser and Y.H.Huang, ACS Nano, 2014, 8, 9295-9303), although these methods can alleviate the problem of using a single nanostructured material as the cathode of a lithium-sulfur battery. Disadvantages, but its porous structure is generally reflected in a layer of material, and some of the methods for preparing porous carbon materials are activated by KOH solution to form a pore structure, which makes the structural stability of the material worse

Method used

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  • Preparation method of double-layer porous carbon nanofibers for lithium-sulfur batteries and method for preparing positive electrode materials using the same
  • Preparation method of double-layer porous carbon nanofibers for lithium-sulfur batteries and method for preparing positive electrode materials using the same
  • Preparation method of double-layer porous carbon nanofibers for lithium-sulfur batteries and method for preparing positive electrode materials using the same

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A preparation method for double-layer porous carbon nanofibers for lithium-sulfur batteries, comprising the steps of:

[0037] 1) Using airflow coaxial electrospinning, the core layer spinning solution and the cortex spinning solution are extruded from the coaxial electrospinning needle at the same time, under the action of high-speed airflow and electrostatic voltage, to the receiving net; Structured nanoscale primary fibers;

[0038] Wherein the core layer spinning solution is obtained by the following steps: 35wt% polyacrylonitrile (PAN) (Mw=150,000, Aldrich), 13wt% porogenic polymer PS are dissolved in 52wt% N,N-dimethylformaldehyde In the amide, continuously stirred at 70°C for 24 hours, and ultrasonically oscillated for 12 hours to obtain a uniform PAN / PS solution;

[0039] Wherein the cortex spinning solution is obtained by the following steps: 38wt% polyacrylonitrile (PAN) (Mw=150,000, Aldrich), 4wt% zinc acetate (Mw=220, Aldrich) are dissolved in 58wt% N,N-di ...

Embodiment 2～5

[0053] On the basis of Example 1, the compositions of the skin layer spinning solution and the core layer spinning solution (as shown in Table 1) were respectively changed to prepare double-layer porous carbon nanofibers for lithium-sulfur batteries.

[0054] Using the double-layer porous carbon nanofibers prepared in each example, the positive electrode material was prepared in the same way as in Example 1, and then the battery was assembled according to the method in Example 1, and performance tests were performed. The results are shown in Table 3.

[0055] Table 1

[0056]

[0057]

Embodiment 6～8

[0059] On the basis of Example 1, only the composition of the core layer spinning solution (as shown in Table 2) was changed to prepare double-layer porous carbon nanofibers for lithium-sulfur batteries.

[0060] Using the double-layer porous carbon nanofibers prepared in each example, the positive electrode material was prepared in the same way as in Example 1, and then the battery was assembled according to the method in Example 1, and performance tests were performed. The results are shown in Table 3.

[0061] Table 2

[0062]

[0063]

[0064] table 3

[0065]

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Abstract

The invention discloses a method for preparing dual-layer porous carbon nano-fibers for a lithium-sulfur battery and a method for preparing a cathode material by utilizing the dual-layer porous carbon nano-fibers. The method for preparing the dual-layer porous carbon nano-fibers comprises the following steps: (1) extruding core spinning liquid and cortex spinning liquid at the same time from a coaxial static spinning needle to a receiving net under the effects of high-speed airflow and electrostatic voltage by utilizing airflow coaxial electrospinning so as to obtain nascent fibers; and (2) insulating the nascent fibers at an air atmosphere for 8-12 hours at 200-400 DEG C, and insulating at an inert gas atmosphere for 8-12 hours at 800-1200 DEG C to obtain the dual-layer porous carbon nano-fibers. The method for preparing a cathode material by utilizing the dual-layer porous carbon nano-fibers comprises the steps of acidifying the dual-layer porous carbon nano-fibers with nitric acid, drying, uniformly mixing with nano-sulfur, conducting agent and adhesive, and performing pump filtering and drying to obtain the cathode material of a lithium-sulfur battery. The cathode material has high storage capacity, and can effectively inhibit the shuttle effect.

Description

technical field [0001] The invention relates to the field of preparation of lithium-sulfur batteries, in particular to a method for preparing double-layer porous carbon nanofibers for lithium-sulfur batteries and a method for preparing positive electrode materials using the same. Background technique [0002] Among all kinds of batteries, lithium-sulfur batteries have high theoretical specific capacity (1675mAh g -1 ) and energy density (2600Wh kg -1 ), has received extensive attention. In this type of battery system, during the battery discharge process, Li + It diffuses from the negative electrode of the battery through the battery separator to the positive electrode of the battery (the main components are composed of carbon materials, elemental sulfur, a small amount of binder and conductive agent, etc.), and reacts with the sulfur in the positive electrode material. At the same time, the moving electrons transfer electrical energy through an external circuit. During ...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/62B82Y40/00
CPCB82Y40/00H01M4/583H01M4/622Y02E60/10
Inventor 程博闻康卫民邓南平鞠敬鸽庄旭品李磊赵义侠
Owner TIANJIN POLYTECHNIC UNIV
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