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Lithium-sulfur battery separator

A technology for lithium-sulfur batteries and diaphragms, which is applied in the direction of lithium batteries, battery electrodes, battery pack components, etc., can solve the problems of low specific capacity, irreversible damage to the sulfur-containing structure of the cathode, and difficulty in inhibiting the diffusion of polysulfides. Electron access, the effect of improving the activity of polysulfide conversion

Active Publication Date: 2020-08-11
TSINGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Parasitic reactions caused by polysulfide dissolution seriously affect the cycle performance and Coulombic efficiency of Li-S batteries
However, it is difficult for the existing lithium-sulfur battery separators to inhibit the diffusion of polysulfides, which in turn allows polysulfides to shuttle between the cathode and anode, resulting in irreversible destruction of the sulfur-containing structure of the cathode.
The shortcomings of the above-mentioned separators lead to a series of problems such as poor cycle stability and low actual specific capacity of lithium-sulfur batteries.

Method used

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  • Lithium-sulfur battery separator
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preparation example Construction

[0041] The preparation method of the lithium-sulfur battery diaphragm 100 includes: providing the basic diaphragm 102; laying the carbon nanotube structure skeleton 106 on the surface of the basic diaphragm 102; 2 The suspension of nanoparticles 108 is evenly dropped on the carbon nanotube structure skeleton 106, and after drying, a plurality of MoP 2 Nanoparticles 108 are attached to the surface of the carbon nanotubes in the carbon nanotube structure skeleton 106 . The multiple MoPs 2 The nanoparticles 108 are located on the surface of the carbon nanotube structure skeleton 106 or filled in the micropores of the carbon nanotube structure skeleton 106 .

[0042] The lithium-sulfur battery 10 provided by the present invention uses a special diaphragm, that is, the lithium-sulfur battery diaphragm 100 . The lithium-sulfur battery separator 100 includes a basic separator 102 and a functional layer 104 . The functional layer 104 includes a carbon nanotube structure skeleton 10...

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Abstract

The invention relates to a lithium-sulfur battery diaphragm, which includes a basic diaphragm and a functional layer, the functional layer is arranged on the surface of the basic diaphragm, wherein the functional layer includes a plurality of carbon nanotubes and a plurality of MoP uniformly mixed 2 Nanoparticles, when the lithium-sulfur battery diaphragm is applied to the lithium-sulfur battery, the functional layer is set on the cathode of the lithium-sulfur battery.

Description

technical field [0001] The invention relates to a lithium-sulfur battery diaphragm. Background technique [0002] Lithium-sulfur batteries use sulfur as the cathode and metallic lithium as the anode. During discharge, the anode reaction is that lithium loses electrons to become lithium ions, and the cathode reaction is that sulfur reacts with lithium ions and electrons to form sulfide. Due to the occurrence of multiple electron transfer reactions, it has a very high theoretical specific capacity, with a specific capacity as high as 1672mAh / g (milliamp hour / gram). 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 attention. [0003] Separators are an important component in lithium-sulfur batteries, separating the cathode and anode to avoid internal short circuits while facilitating the transport of free lithium ions between the el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/411H01M50/417H01M50/431H01M50/443H01M50/451H01M50/457H01M50/46H01M50/491
CPCH01M10/052H01M50/431H01M50/451H01M50/491H01M50/417H01M50/457H01M4/38H01M4/382B82Y30/00Y02E60/10H01M50/44
Inventor 罗宇峰王佳平范守善
Owner TSINGHUA UNIV
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