Preparation method of amorphous sulfide solid electrolyte

Abstract

The invention relates to the field of lithium ion batteries, in particular to a preparation method of an amorphous sulfide solid electrolyte. The preparation method of the amorphous sulfide solid electrolyte is characterized by mainly comprising the following steps: (1) putting metallic lithium, elemental sulfur, germanium sulfide and phosphorus pentasulfide in a certain proportion into a water-free and oxygen-free sealed container for mixing; and (2) mechanically grinding the raw materials mixed in the step (1) so as to prepare the amorphous sulfide solid electrolyte. According to the preparation method, the proportion of lithium, sulfur to phosphorus can be accurately controlled, and the problem that raw material volatilization in a high-temperature solid-phase method causes relatively low product purity is solved; and meanwhile, the resources of the raw materials are abundant, the process is simple, and the high-purity amorphous sulfide solid electrolyte can be obtained through a ball-milling one-step method.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for preparing an amorphous sulfide solid electrolyte. Background technique [0002] Low energy consumption and environmentally friendly new energy vehicles are the direction of future vehicle development, and power batteries are the key factors affecting the performance of new energy vehicles. The power batteries of existing new energy vehicles usually use organic liquid electrolytes, but they are prone to fire or explosion if used improperly, posing a major safety hazard. All-solid-state batteries use solid electrolytes, and there is no flammable liquid electrolyte, which greatly improves safety. At the same time, all-solid-state batteries have more storage capacity and greater output power. However, the low ionic conductivity of current solid electrolytes hinders the practicality of all-solid-state batteries. [0003] Compared with the oxide solid electrolyte, th...

AI Technical Summary

Problems solved by technology

However, lithium sulfide is generally used as the raw material in the current common synthesis method. Lithium sulfide is expensive and easy to absorb moisture and hydrolyze, which affects the progress of industrialization.

The Chinese patent with the publication number CN1937301A discloses "a sulfide material that can be used as a solid electrolyte for lithium-ion batteries and its preparation method". A variety of lithium sources are used to prepare sulfide solid electrolytes at high temperatures, although sulfide solid electrolytes can be prepared , but high temperature treatment causes material crystallization, low ionic conductivity and increased energy consumption, and material volatilization makes it difficult to accurately control the product ratio

Images