Method for preparing solid electrolyte by dry method and application thereof

Abstract

The invention provides a method for preparing a solid electrolyte by a dry method and application of the solid electrolyte. The method comprises the following steps: uniformly mixing preparation raw materials and an organic additive in a dry mixing manner; and calcining the uniformly mixed powder to obtain the catalyst. According to the method for preparing the solid electrolyte by the dry method, the organic additive is added into the preparation raw materials, the raw materials are mixed and stirred by the dry method, and the fluidity and moisture retention of the materials are improved by the organic additive. The material is prevented from adhering to the wall of a crucible in the calcining process due to good fluidity, and the problem of material expansion caused by gas discharge is effectively relieved due to higher moisture retention. In addition, the organic additive is easy to decompose and volatilize in a high-temperature calcination process, so that the solid electrolyte does not introduce an impure phase and does not generate ionic pollution. The method is simple and easy to implement, on one hand, the yield and quality of the sample can be greatly improved, on the other hand, industrial mass production is easy to realize, and the method has very high commercial value.

Description

technical field [0001] The invention relates to the technical field of solid electrolytes, in particular to a method for preparing solid electrolytes by dry method and application thereof. Background technique [0002] Chemical mobile power sources have the advantages of high energy density, conversion efficiency, safety, economical and environmental protection, etc., and have attracted widespread attention, especially lithium-ion batteries and sodium-ion batteries that can be recharged and discharged cyclically. From the perspective of battery safety performance, lithium batteries that generally use organic electrolytes have safety problems such as thermal runaway, fire, and even explosion. Moreover, during the cycle of the battery, lithium ions move back and forth between the positive and negative electrodes through the electrolyte, which is often accompanied by a series of side reactions. The decomposition of the lithium salt and the continuous consumption of the solvent ...

AI Technical Summary

Problems solved by technology

However, wet mixed raw materials will use various solvents, and will also involve the solvent drying process and the use of corresponding equipment, which will increase the preparation cost, complicate the process, prolong the time, and sometimes there will be problems such as serious residual alkali.

In the process of calcining solid electrolytes, electrolyte expansion and wall sticking often occur. Material expansion causes the volume filling rate of raw materials in the device to be reduced, otherwise it is easy to overflow, so the synthesis amount of a single batch is very low, which greatly increases the production cost.

However, the material sticking to the wall makes it difficult to take out the finished product from the appliance, resulting in a decrease in yield and a low reuse rate of the appliance, which is not conducive to large-scale production

In the preparation of solid-state electrolytes, especially those containing phosphate raw materials, such as diammonium hydrogen phosphate, decompose at low temperature to produce water and ammonia gas, which can easily cause the sample to stick to the wall, and the finished product is difficult to take out. At the same time, it is accompanied by material expansion, resulting in low yield.

For perovskite-type and garnet-type electrolytes with high synthesis temperature, the material is easy to bond with the crucible, and even damage the container

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