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

这项第二阶段研究考察了钠硫电池，这是电动汽车应用的主要候选产品。 钠硫电池中的关键组分是电解质Na-B-氧化铝。 在现有技术的钠-硫电池中，电解质厚度约为1.5 mm，这对电池比电阻贡献了近40%。 提出了两种方法，以favricate薄（20至100 μ m）的钠-硼-氧化铝膜，可以降低电解质电阻的一个因素-30。 这将大大提高功率密度和能源效率。 提出的两种技术是：1。电化学气相沉积（EVD），和2.）通过α-氧化铝的直接转化制备Na-B-氧化铝的薄膜; 3.）测量薄膜的传导特性; 4.）通过钠-钠测试探索Na-B-氧化铝膜在电化学测试中的载流能力; 5.）探索EVD和直接转化过程的机理和动力学，以及6.）将稀电解质供应给电池开发者以用于在钠硫电池中评估。

This Phase-II research examines sodium-sulfur battery, a leading candiadate for application in electric vehicles. A critical component in sodium-sulfur battery is the electrolyte, Na-B-alumina. In the state-of-the-art sodium-sulfur batteries, electrolyte thickness is approximately 1.5 mm which contributes nearly 40% to cell specific resistance. Two approaches are proposed to favricate thin (20 to 100 um) Na-B-alumina membranes which can reduce electrolyte resistance by a factor of - 30. This should substantially increase power density and energy efficiency. The two techniques proposed are: 1.) electrochemical vapor deposition (EVD), and 2.) fabricate thin membranes of Na-B-alumina by direct conversion of a-aluminia ; 3.) measure conduction properties of thin membranes; 4.) explore the current carrying capacity of Na-B-alumina membranes in electrochemical tests by sodium-sodium tests; 5.)explore the mechanism and the kinetics of the EVD and direct conversion processes, and 6.) supply thin electrolytes to a battery developer for evaluation in sodium-sulfur cells.