Highly conductive solid electrolyte prepared by coprecipitation method

Abstract

The invention relates to the technical field of solid electrolytes, and in particular, relates to a highly conductive solid electrolyte prepared by a coprecipitation method, wherein a preparation method comprises the steps: step 1, weighing a dopant, aluminum nitrate, tetrabutyl titanate and ammonium dihydrogen phosphate, sequentially putting the raw materials into a reaction container, and continuously stirring at room temperature until faint yellow slurry is formed; step 2, slowly adding ammonia water into the faint yellow slurry and dissolving; step 3, heating the reaction container to 88-90 DEG C, and carrying out constant-temperature water bath magnetic stirring for 0.8-1.1 h, to form a white precipitate; step 4, transferring the white precipitate into a blast drying oven, and heatingto obtain a white precursor; step 5, presintering the white precursor to obtain white powder; and step 6, carrying out ball milling on the white powder, tabletting, molding and calcining to obtain asolid electrolyte sintered body. The solid electrolyte provided by the invention has an NASICON structure, small interface resistance and excellent electrochemical stability, and the particle size reaches nanoscale.

Description

technical field [0001] The invention relates to the technical field of solid electrolytes, in particular to a high-conductivity solid electrolyte prepared by a co-precipitation method. Background technique [0002] Among many emerging energy storage technologies, lithium batteries are still the most promising energy storage devices. The application fields range from portable electronic devices to electric vehicles, hybrid vehicles and smart grids. All-solid-state lithium batteries can provide higher energy density and Safety has become the development direction of next-generation energy storage technology. Solid electrolyte is the core material of all-solid-state lithium batteries, which must meet a series of high ion conductivity, a large number of vacancies and charge carriers, wide electrochemical window and low electronic conductivity. Requirements, electrolytes with NASICON structure have been widely used in the field of electrochemical energy storage due to their good ...

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Problems solved by technology

However, Ge 4+ and Ti 4+ will be reduced by lithium, leading to a significant increase in interfacial resistance, which in turn makes the electrochemical stability of these two materials unsatisfactory for lithium.

[0004] The general co-precipitation method is to prepare the ions to be precipitated into a uniformly mixed solution in advance, and then use a certain precipitant to make the ions in the system reach the precipitation conditions to be precipitated, which is usually used to prepare ultrafine nanopowders; this method It has the characteristics of easy operation, but there are too many chemical reagents in this method, which is easy to cause environmental pollution and has great safety hazards. Secondly, the solid electrolyte prepared by coprecipitation method has low ion conductivity.

[0005] At present, only the preparation of Ce 0.8 m 0.2 o 1.9 Research on the Properties of Solid Electrolytes", how to use co-precipitation to prepare solid electrolytes with NASICON structure is still under study

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