lithium sulfur battery

Abstract

The invention relates to a lithium-sulfur battery, which includes 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 , located in the electrolyte, wherein the lithium-sulfur battery separator includes a basic separator and a functional layer, the functional layer includes a plurality of MoP 2 nanoparticles and multiple graphene sheets, the multiple MoP 2 The nanoparticles and a plurality of graphene sheets are mixed and evenly distributed, and the plurality of graphene sheets are overlapped or stacked to form an integral graphene layer. The plurality of MoP 2 Nanoparticles are attached to the surfaces of multiple graphene sheets, and when the lithium-sulfur battery separator is applied to a 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. 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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