Preparation method of llzo, quasi-solid electrolyte for thermal battery and preparation method thereof

Abstract

The invention relates to a preparation method of LLZO, a quasi-solid electrolyte for thermal batteries and a preparation method thereof. The preparation method of the quasi-solid electrolyte comprises: mixing Li 2 CO 3 , La 2 o 3 , ZrO 2 、H 2 C 2 o 4 and alkali metal halides and other raw materials for purification; weigh the required Li 2 CO 3 , La 2 o 3 、H 2 C 2 o 4 and ZrO 2 Put it into a sealed stainless steel tank after grinding evenly, bake it under the condition of 1200 °C, cool it naturally and grind it into a ball mill to get a lithium lanthanum zirconium oxygen solid electrolyte (Li 7 La 3 Zr 2 o 12 , LLZO); LLZO and alkali metal halide eutectic salt were mixed again, and the temperature was rapidly raised to 400‑500 °C under the protection of argon, and the eutectic salt was infiltrated into the porous LLZO by repeated vacuuming and slow pressure. In the process, the quasi-solid electrolyte for thermal batteries can be obtained after natural cooling and ball milling of the product. The quasi-solid electrolyte prepared by the invention has the advantages of small grain boundary resistance, high ion mobility, good thermal stability and the like.

Description

technical field [0001] The invention relates to the field of material chemistry, in particular to a preparation method of LLZO, a quasi-solid electrolyte for thermal batteries and a preparation method thereof. Background technique [0002] At present, thermal batteries used as missile-borne power sources use alkali metal halide eutectic salts as electrolytes, which are flowable liquids above the eutectic point. Although the flow inhibitor MgO will be added to the electrolyte to form the spacer powder when preparing the thermal battery, with the continuous improvement of the performance of the weapon system, the requirements for the battery to resist the mechanical environment are getting higher and higher. However, there is still a risk of electrolyte spillage, causing a short circuit in the battery. The use of solid electrolyte materials with strong thermal stability, wide electrochemical window, and non-melting within the operating temperature range of thermal batteries t...

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Problems solved by technology

Chinese patent CN105489930A adopts a kind of molten salt method to prepare LLZO, and this method calcining temperature is lower, and calcining time is shorter, and the LLZO electrical conductivity that makes is higher (1.6×10 -4 S / cm), but due to the use of LiCl-KCl eutectic salt, it is highly corrosive to equipment at high temperatures (700-800 ° C), and there is no possibility of large-scale production at present.

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