Lithium-sulfur battery separator

Abstract

The present invention relates to a lithium-sulfur battery separator, which comprises a basic separator and a functional layer, wherein the functional layer is arranged on the surface of the basic separator, wherein the functional layer comprises a plurality of MoP 2 Nanoparticles and multiple graphene sheets, the multiple MoPs 2 Nanoparticles and multiple graphene sheets are mixed and evenly distributed with each other, and the multiple graphene sheets are overlapped or stacked to form an integral graphene layer, and the multiple MoP 2 The nanoparticles are attached to the surfaces of the plurality of graphene sheets, and when the lithium-sulfur battery separator is applied to the lithium-sulfur battery, the functional layer is disposed 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...

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.

Images