Preparation method of lithium-sulfur battery diaphragm

A lithium-sulfur battery and separator technology, which is applied in the field of preparation of lithium-sulfur battery separators, can solve the problems of poor cycle stability, poor rate characteristics, and damage to the positive electrode sulfur-containing structure of lithium-sulfur batteries, and achieves inhibition of polysulfide diffusion, good mechanical and conductivity, avoiding the effect of shuttling

Active Publication Date: 2018-03-09
TSINGHUA UNIV +1
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  • Claims
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Problems solved by technology

However, the lithium-sulfur battery separator obtained by the existing preparation method of the lithium-sulfur battery separator is difficult to inhibit the diffusion of polysulfides, and then the polysulfides are shuttled between the positive electrode and the negative electrode, resulting in irreversible destruction of the sulfur-containing structure of the positive electrode.
Eventually lead to a series of problems such as poor cycle stability, low actual specific capacity, and poor rate characteristics of lithium-sulfur batteries

Method used

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  • Preparation method of lithium-sulfur battery diaphragm
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  • Preparation method of lithium-sulfur battery diaphragm

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[0034] The third embodiment of the present invention further provides a method for preparing a lithium-sulfur battery separator. The preparation method of the lithium-sulfur battery diaphragm comprises the following steps:

[0035] S1: providing a diaphragm base; and

[0036] S2: forming a functional layer on a surface of the diaphragm substrate, the method for forming the functional layer includes:

[0037] S21: laying a first carbon nanotube layer on the surface of the membrane substrate;

[0038] S22: Provide a plurality of manganese dioxide nanoparticles and a plurality of graphene oxide sheets, disperse the plurality of manganese dioxide nanoparticles and a plurality of graphene oxide sheets in a solvent to obtain a mixture, and uniformly deposit the mixture on the A first graphene oxide composite layer is formed on the surface of the first carbon nanotube layer;

[0039] S23: laying a second carbon nanotube layer on the surface of the first graphene oxide composite la...

Embodiment 1

[0058] The sulfur-carbon nanotube composite electrode is used as the positive electrode, the metal lithium sheet is used as the negative electrode, and the 1,3-dioxolane (DOL) / ethylene glycol dimethyl ether (DME)-based bis(trifluoromethanesulfonic acid) ) lithium imide (LiTFSI) as the electrolyte to form a lithium-sulfur battery. Among them, the mass proportion of sulfur loaded on the positive pole piece is 75 wt%.

[0059] The lithium-sulfur battery diaphragm in this embodiment includes a diaphragm substrate and a functional layer, the diaphragm substrate is a polyethylene film with a thickness of 20 microns, and the functional layer includes 10 layers of graphene oxide sheets and 10 layers of carbon nanotube layers alternately arranged on the one surface of the membrane base. Multiple MnO 2 The nanoparticles are adsorbed on graphene oxide sheets, and the multiple MnO 2 Nanoparticles are embedded in the interlayer formed by the carbon nanotube layer and the graphene oxide ...

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Abstract

The invention relates to a preparation method of a lithium-sulfur battery diaphragm, comprising the steps of S1, providing a diaphragm base; and S2, forming a functional layer on at least one surfaceof the diaphragm base, to be specific, S21, laying a first carbon nanotube layer on at least one surface of the diaphragm base; S22, providing multiple manganese dioxide nanoparticles and multiple graphene oxide sheets, dispersing the multiple manganese dioxide nanoparticles and multiple graphene oxide sheets in a solvent to obtain a mixture, depositing the mixture evenly on the surface of the first carbon nanotube layer to form a first graphene oxide composite layer; S23, laying a second carbon nanotube layer on the surface of the first graphene oxide composite layer; S24, forming a second graphene oxide composite layer on the surface of the second carbon nanotube layer.

Description

technical field [0001] The invention relates to a preparation method of a lithium-sulfur battery diaphragm, in particular to a preparation method of a lithium-sulfur battery diaphragm based on a carbon nanotube film. Background technique [0002] Lithium-sulfur batteries use sulfur as the positive electrode and metallic lithium as the negative electrode. During discharge, the negative electrode reaction is that lithium loses electrons and becomes lithium ions, and the positive electrode reaction is that sulfur reacts with lithium ions and electrons to form sulfide. The reaction equation is: S 8 +16Li + +16e -1 =8Li 2 S. Due to the occurrence of multiple electron transfer reactions, it has a high theoretical specific capacity, with a specific capacity as high as 1672 mAh g -1 . In addition, because sulfur has the characteristics of less environmental pollution, non-toxicity, low cost, and wide source of raw materials, lithium-sulfur batteries have received more and more...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403H01M50/431H01M50/443H01M50/449H01M50/451H01M50/457H01M50/463H01M50/489
CPCH01M10/052H01M50/431H01M50/403H01M50/463H01M50/451H01M50/489H01M50/457B32B5/12B32B5/24H01M4/38H01M4/382B32B3/26B32B9/045B32B27/08B32B9/04B32B2250/40B32B27/32B32B2307/732B32B2307/50B32B2307/202B32B2457/10Y02E60/10H01M50/44
Inventor 孔维邦王佳平姜开利范守善
Owner TSINGHUA UNIV
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