Method for preparing high-sulfur-loading-mount electrode material, namely sulfur-titanium dioxide-polypyrrole (S-TiO2-PPy)

Abstract

The invention discloses a method for preparing a high-sulfur-loading-mount electrode material, namely sulfur-titanium dioxide-polypyrrole (S-TiO2-PPy). The method comprises the steps: bacterial cellulose aerogel is prepared firstly, then the bacterial cellulose aerogel is soaked in an isopropanol solution of butyl titanate, then soaked bacterial cellulose is palced into an isopropanol aqueous solution, after a reaction is completed, a sample is subjected to freeze drying, after sintering, a three-dimensional TiO2 nanotube is obtained, then the three-dimensional TiO2 nanotube is immersed in sulfur under the argon atmosphere of 155 DEG C, S-TiO2 is obtained, finally in ice-water bath, through ammonium sulfate oxidization, a layer of PPy thin film is synthesized on the surface of the S-TiO2,and the S-TiO2-PPy electrode material is formed. The three-dimensional TiO2 nanotube is successfully synthesized through biological materials BC, and then the S-TiO2-PPy electrode material highly loaded with sulfur is synthesized; and according to the preparation method, the high-sulfur-loading-mount electrode material is quickly analyzed, environmental friendliness is achieved, and the problems such as environment pollution, long preparation time, valuable equipment and lab consumable loss caused by synthesis through adjusting and controlling of chemical reagents are avoided.

Description

technical field [0001] The invention relates to the technical field of preparation of electrode materials with high sulfur loading. Background technique [0002] Lithium-sulfur battery (LSB) has a high specific capacity (~1675mAh g -1 , ~3500mA h cm -3 ), high energy density (2.6kW h kg -1 ), low cost, environmental friendliness and rich resources, etc., have attracted the attention of the majority of scientific researchers. However, LSB also has obvious deficiencies: the reaction intermediate polysulfide is easily soluble in the organic electrolyte, resulting in rapid decline in battery capacity and even battery failure; the large volume change of sulfur (~80%) is easy to cause the cathode powder to fall off and fail. Taking appropriate measures to solve the above-mentioned various problems faced by LSBs requires the cathode carrier to load as much sulfur as possible, effectively adsorb polysulfides to suppress their dissolution and shuttling effects, and be able to buff...

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Problems solved by technology

However, LSB also has obvious deficiencies: the reaction intermediate polysulfide is easily soluble in the organic electrolyte, resulting in rapid decline in battery capacity and even battery failure; the large volume change of sulfur (~80%) is easy to cause the cathode powder to fall off and fail, etc.

Preparation of TiO with both ultra-high specific surface area and ultra-high pore volume 2 The carrier can give full play to the advantages of its structural characteristics and chemical components, through its ultra-high specific surface area and large pore volume, it can load sulfur in a high amount, and use its complex hierarchical pore structure and chemical affinity for lithium polysulfide to physically and chemically The dual mode inhibits the dissolution and shuttle effect of polysulfides, and buffers the volume change of sulfur during the cycle, while the formation of a polypyrrole coating on the surface of the electrode material can improve the conductivity of the electrode, and it can also be adsorbed in a dual way of physical and chemical Polysulfides inhibit their dissolution and shuttle effects, but how to prepare sulfur carrier materials with both ultra-high specific surface area and ultra-high pore volume, in the existing research, the preparation method is not particularly mature, so BC is used as a template to prepare Sulfur carrier materials with both ultra-high specific surface area and ultra-high pore volume will become a trend and hot spot in future technology development

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