Thin Na-B"-Alumina Electrolytes by Electrochemical Vapor Deposition (EVD) for Sodium-Sulfur Batteries

钠-贝塔氧化铝是用于钠硫电池的固体电解质膜，应用于负载均衡、电动汽车和卫星通信。将采用一种新的方法来制备薄(20-50微米)Na-β-Al_2O_3固体电解质。这种被称为电化学气相沉积(EVD)的方法已经成功地用于沉积用于固体氧化物燃料电池的氧化锆、钙钛矿和二氧化铈。该方法包括使气体物种反应，在多孔载体上形成一层薄薄的Na-β-氧化铝薄膜，通过EVD进一步生长。将建造一个EVD反应堆。Na-β-Al_2O_3膜将通过两种工艺沉积：一步法和两步法。对膜的微观结构、晶体结构和导电性进行了表征。

Sodium-beta (Na-beta)-alumina is the solid electrolyte membrane used in sodium-sulfur batteries with applications in load leveling, electric automobiles, and satellite communications. A novel method for the fabrication of thin (20 to 50 micrometers) Na-beta-alumina solid electrolytes will be undertaken. This method, known as electrochemical vapor deposition (EVD), has been used successfully to deposit zirconia, perovskites, and ceria for applications in solid oxide fuel cells. The method consists of reacting gaseous species to form a thin membrane of Na-beta-alumina over a porous support, further growth of which occurs by EVD. An EVD reactor will be built. Na-beta-alumina membranes will be deposited using two processes; a one step and a two step process. The membranes will be characterized with regards to microstructure, crystal structure and conductivity.