Carbon-sulfur composite positive electrode for lithium-sulfur battery and preparation method of carbon-sulfur composite positive electrode

Abstract

The invention discloses a carbon-sulfur composite positive electrode for a lithium-sulfur battery and a preparation method of the carbon-sulfur composite positive electrode, and belongs to the technical field of lithium-sulfur batteries. The carbon-sulfur composite positive electrode consists of a carbon-sulfur composite layer and a conductive carbon layer which are sequentially coated on the current collector; the carbon-sulfur composite layer is composed of a sulfur material, a carbon material I and an aqueous binder, and the conductive carbon layer is composed of a carbon material II and anorganic binder. According to the double-layer carbon-sulfur composite positive electrode prepared by the method, the construction of a high-sulfur-capacity, high-sulfur-content, high-specific-capacity and long-cycle-life high-energy-density lithium-sulfur battery can be realized. The preparation method of the composite positive electrode is simple and convenient to operate, low in cost and easy to amplify, the design and preparation of the positive electrode of the lithium-sulfur battery are effectively promoted, and a new possibility is provided for the practicability of the lithium-sulfur battery with high energy density.

Description

technical field

[0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a carbon-sulfur composite positive electrode for lithium-sulfur batteries and a preparation method thereof. Background technique

[0002] High-performance rechargeable batteries play an integral role in fields such as electric vehicles, consumer electronics, and smart grids. However, the energy density of current commercialized lithium-ion batteries tends to its theoretical limit and cannot achieve more than 400Whkg -1 high energy density requirements. Lithium-sulfur batteries use sulfur element as the positive electrode active material, metal lithium as the negative electrode active material, and the theoretical energy density is as high as 2600Whkg -1 , is considered to be a promising high energy density secondary battery system and has received extensive attention. However, the practical application of lithium-sulfur batteries still faces many c...

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