Preparation method for amorphous state sulfide solid electrolyte

Abstract

The invention relates to the field of a lithium ion battery and specifically to a preparation method for an amorphous state sulfide solid electrolyte. The preparation method for the amorphous state sulfide solid electrolyte is characterized by comprising the following steps of (1) putting metal lithium, elemental sulfur and phosphorus pentasulfide into an anhydrous and oxygen-free sealed container for mixing; and (2) performing mechanical grinding on the mixed raw materials obtained in the step (1) to obtain the amorphous state sulfide solid electrolyte. According to the preparation method, the proportion of lithium to sulfur to phosphorus can be accurately controlled; the problem of a relatively low purity of the product caused by raw material volatilization existing in a high-temperature solid state method is solved; and meanwhile, the preparation method is rich in raw material sources and simple in process; and the high-purity amorphous state sulfide solid electrolyte can be obtained in one step by a ball milling 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...

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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

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