Electrode for inhibiting shuttle flying of polysulfide ions in lithium-sulfur battery and preparation and application thereof

Abstract

The invention relates to an electrode for inhibiting shuttle flying of polysulfide ions in a lithium-sulfur battery and preparation and application thereof. According to the electrode, a composite metal-oxide composite coating capable of physically screening and chemically adsorbing polysulfide is deposited on a sulfur-carbon positive electrode material by applying a contact type chemical platingprocess, the current collecting effect of the electrode and the electron transmission efficiency in the electrode can be improved, the higher active substance utilization rate is achieved, the electrode polarization is reduced, the electrochemical capacity is improved, the shuttle flying effect of polysulfide can be well restrained, and the cycle life is prolonged. The sulfur-carbon electrode anda metal lithium negative electrode are assembled into a lithium-sulfur battery, so that the performance and the energy density of the battery can be greatly improved, and the sulfur-carbon electrode has huge potential of realizing industrial large-scale production in the future.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, and more specifically relates to lithium-sulfur battery electrodes and their preparation. Background technique [0002] The research and development of lithium-sulfur batteries has gradually attracted attention since the 1990s. This is due to the fact that modern electronic devices require higher energy output. Lithium-sulfur batteries can meet such needs. It has a high theoretical energy density, and elemental sulfur The specific capacity is as high as 1,675mAh / g, and the mass specific energy is as high as 2,600Wh / kg. In addition, sulfur exists widely in nature. The data shows that the abundance of sulfur in nature is about 0.048wt%, and it belongs to the natural resources that have not been fully utilized. resource. Sulfur in nature mainly exists in the form of elemental sulfur (S8), which is thermodynamically stable at room temperature. In addition, elemental sulfur has the ...

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Problems solved by technology

However, the above-mentioned methods are usually difficult to meet the requirements of industrialization including low cost, mature process, and simplicity in physical sieving, chemical adsorption, synergistic inhibition of polysulfide shuttles, and improvement of electrode conductivity.

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