Lithium-sulfur battery

Abstract

The invention relates to a lithium-sulfur battery. The lithium-sulfur battery comprises a cathode, an anode, a lithium-sulfur battery diaphragm and an electrolyte, the electrolyte is located between the cathode and the anode, and the lithium-sulfur battery diaphragm is arranged between the cathode and the anode and located in the electrolyte, wherein the lithium-sulfur battery diaphragm comprisesa base diaphragm and a functional layer, the functional layer is arranged on the surface of the base diaphragm, the functional layer comprises a carbon nano tube structure framework and multiple MoP2nano-particles, the MoP2 nano-particles are arranged on the surface of the carbon nano tube structure framework, micropores of the carbon nano tube structure framework are filled with the MoP2 nano-particles, and the carbon nano tube structure framework is used for supporting the MoP2 nano-particles, and when the lithium-sulfur battery diaphragm is applied to the lithium-sulfur battery, the functional layer directly faces the cathode of the lithium-sulfur battery.

Description

technical field [0001] The invention relates to a lithium-sulfur battery. 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 electrodes. ...

AI Technical Summary

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.

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