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A self-supporting hollow carbon fiber membrane and its preparation method and application in lithium-sulfur batteries

A self-supporting, carbon fiber technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problem of low conductivity, achieve high specific capacity, high specific surface area, and reduce contact impedance

Active Publication Date: 2021-07-09
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The self-supporting hollow carbon fiber membrane can encapsulate a large amount of active material sulfur and solve the problem of low conductivity of sulfur; the large pores formed by the overlapping of hollow carbon fibers are conducive to the rapid transmission of electrolyte and improve the rate performance of the sulfur cathode; Carbon fibers rich in heteroatoms can chemically adsorb lithium polysulfides formed by sulfur in the electrochemical reaction process, improving the cycle stability of lithium-sulfur batteries

Method used

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  • A self-supporting hollow carbon fiber membrane and its preparation method and application in lithium-sulfur batteries
  • A self-supporting hollow carbon fiber membrane and its preparation method and application in lithium-sulfur batteries
  • A self-supporting hollow carbon fiber membrane and its preparation method and application in lithium-sulfur batteries

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Embodiment 1

[0039] This embodiment provides a method for preparing a self-supporting hollow carbon fiber membrane and a method for preparing a self-supporting sulfur cathode material.

[0040] Preparation of self-supporting hollow carbon fiber membrane: vacuum filter the manganese dioxide nanowire and carbon nanotube dispersion into a membrane to obtain a manganese dioxide nanowire / carbon nanotube composite membrane. Wire / carbon nanotube surface coated with carbon, and then the prepared carbon-coated manganese dioxide nanowire / carbon nanotube composite membrane was soaked in dilute hydrochloric acid solution to remove manganese dioxide to obtain a self-supporting hollow carbon fiber membrane (from Supported hollow carbon fiber / carbon nanotube composite membrane). The specific operation steps are as follows:

[0041] S1 Dissolve 0.338g of manganese sulfate monohydrate, 0.427g of potassium perchlorate, and 0.343g of potassium acetate in 30ml of deionized water, then add 1.6ml of acetic aci...

Embodiment 2

[0049] This embodiment provides a method for preparing a self-supporting hollow carbon fiber membrane and a method for preparing a self-supporting sulfur cathode material.

[0050] The preparation of the self-supporting hollow carbon fiber membrane: the manganese dioxide nanowire dispersion liquid was vacuum filtered to form a membrane, and the carbon was coated on the surface of the pure manganese dioxide nanowire membrane by vapor deposition, and then the prepared carbon was coated with two The manganese oxide nanowire membrane is soaked in dilute hydrochloric acid solution to remove manganese dioxide to obtain a self-supporting hollow carbon fiber membrane. The specific operation steps are as follows:

[0051] S1 Dissolve 0.676g of manganese sulfate monohydrate, 0.854g of potassium perchlorate, and 0.686g of potassium acetate in 60ml of deionized water, then add 1.6ml of acetic acid, stir for 30min, add it to a hydrothermal kettle, react at 160°C for 8h, centrifuge, and wash...

Embodiment 3

[0057] This embodiment provides a method for preparing a self-supporting hollow carbon fiber membrane and a method for preparing a self-supporting sulfur cathode material.

[0058] Preparation of self-supporting hollow carbon fiber membranes: Manganese dioxide nanowires and graphene oxide dispersions were vacuum-filtered into membranes to obtain manganese dioxide nanowires / graphene oxide composite membranes. The surface of wire / graphene oxide is coated with carbon, and then the prepared carbon-coated manganese dioxide nanowire / graphene composite membrane is soaked in dilute hydrochloric acid solution to remove manganese dioxide to obtain a self-supporting hollow carbon fiber membrane (self-supporting hollow carbon fiber / graphene composite membrane). The specific operation steps are as follows:

[0059] S1 Dissolve 0.845g of manganese sulfate monohydrate, 1.067g of potassium perchlorate, and 0.858g of potassium acetate in 75ml of deionized water, then add 4.0ml of acetic acid,...

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Abstract

The invention provides a self-supporting hollow carbon fiber membrane, a preparation method thereof and an application in a lithium-sulfur battery. The self-supporting hollow carbon fiber membrane is obtained by using a metal oxide nanowire film as a template, coating a functional carbon layer on the surface of the metal oxide nanowire by vapor deposition, and removing the metal oxide nanowire template by acid washing. Using a self-supporting hollow carbon fiber membrane as an electrode, elemental sulfur is loaded in the self-supporting hollow carbon fiber membrane by electrolysis to form a self-supporting sulfur cathode in which sulfur is in electrochemical contact with the carrier and is highly dispersed. The hollow carbon fibers are "welded" to each other through carbon layers to form a stable self-supporting structure. The cavity of the hollow carbon fiber can encapsulate and highly disperse elemental sulfur in a large amount, and the functional carbon layer is rich in heteroatoms, which can chemically adsorb the lithium polysulfide formed during the electrochemical reaction of the sulfur positive electrode, and obtain a positive electrode material with a high sulfur load. In the case of high sulfur loading per unit area, sulfur batteries still achieve high specific capacity and good cycle performance.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and in particular relates to a self-supporting hollow carbon fiber membrane, a preparation method thereof and an application in a lithium-sulfur battery. Background technique [0002] As a next-generation high-energy-density energy storage system, lithium-sulfur batteries have high energy density (2600Wh kg -1 ), low cost, and environmental friendliness, it shows broad application prospects in electric vehicles, unmanned aerial vehicles, satellites, and other energy storage fields. However, the relatively low conductivity and lithium ion conduction efficiency of the active substance sulfur and its charge-discharge product lithium polysulfide affect the rate performance of lithium-sulfur batteries; the volume expansion of sulfur during charge-discharge and the intermediate product polysulfide produced Lithium is easily dissolved in the electrolyte, resulting in decreased cycle stabil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C16/01C23C16/26C25D9/04H01M4/62
CPCC23C16/01C23C16/26C25D9/04H01M4/625Y02E60/10
Inventor 陆安慧何斌李文翠
Owner DALIAN UNIV OF TECH