Preparation method of sulfide solid electrolyte

Abstract

The invention provides a preparation method of sulfide solid electrolyte and belongs to the field of solid electrolyte. The preparation method comprises the following steps: (1) putting raw materialsincluding sulfur powder, lithium hydride, phosphorus pentasulfide and lithium phosphate into a vacuum drying box and drying; (2) under the protection of an inert atmosphere and weighing the dried rawmaterials in percentage by mass respectively: 15 percent to 40 percent of the sulfur powder, 5 percent to 20 percent of the lithium hydride, 50 percent to 70 percent of the phosphorus pentasulfide and0 to 10 percent of the lithium phosphate; pre-grinding in a mortar for 5 to 20min; adding the raw materials into a sealed ball milling pot; carrying out ball milling at room temperature and at a rotary speed of 200 to 600r / min for 24 to 60h; (3) after ball milling reaction is finished, taking the powder out from the ball milling pot under the inert atmosphere; adding the powder into a crucible and sintering in a high-temperature tubular furnace under a nitrogen atmosphere, wherein the sintering temperature is 200 to 400 DEG C and the sintering time is 2 to 6h; taking the powder out from the crucible to obtain the sulfide solid electrolyte. The preparation method of the sulfide solid electrolyte, provided by the invention, has the characteristics of simple technology, low raw material costand easiness for industrialized production.

Description

technical field [0001] The invention belongs to the field of solid electrolytes, and in particular relates to a solid electrolyte material that can be used in an all-solid-state lithium ion battery and a preparation method thereof. Background technique [0002] The vigorous development of mobile electrochemical systems for high-energy-density Li-ion batteries, traditional systems using organic liquid electrolytes require improvements in safety and durability. This leads to the need for suitable solid electrolytes. In solid-state electrolytes, based on Li 2 S-P 2 S 5 The systemic sulfide solid electrolyte was demonstrated to have ionic conductivity at 25 °C comparable to the currently used liquid electrolytes. [0003] This sulfide-based solid electrolyte is mainly prepared from lithium sulfide, phosphorus pentasulfide and additives through high-energy ball milling and post-heat treatment. The solid electrolyte obtained from these conventional methods exhibits excellent l...

AI Technical Summary

Problems solved by technology

[0003] This sulfide-based solid electrolyte is mainly prepared from lithium sulfide, phosphorus pentasulfide and additives through high-energy ball milling and post-heat treatment. The solid electrolyte obtained from these conventional methods shows excellent lithium ion conductivity, but the high lithium sulfide raw material The cost and the existing lithium sulfide preparation method all need solvents, the efficiency of the solid-liquid separation process is low, the cost is high, and the solvent is toxic and harmful, it is expensive and difficult to realize industrial production, and the lithium sulfide obtained by this method has a low purity. Disadvantages of high energy consumption