硅作为金属-空气电池的阳极燃料理论比能量高达8470Wh/kg，比铝还要高，然而由于纯硅导电率低，作为阳极材料性能并不理想。本项目旨在研究一种硅合金阳极材料FeSi2，它的导电性好、理论容量高、成本低廉，是一种潜在的优秀阳极燃料，但是在碱性电解液中存在自腐蚀的缺点。申请人在前期的实验中用熔融旋淬法制备了Ti掺杂的FeSi2阳极材料，它表现出了优异的抗KOH电解液腐蚀能力，在金属-空气电池中初步测出的阳极能量密度达到2128Wh/kg，电池能量密度能达到锂电池的5倍以上。本项目计划合成一系列金属如Ti、Cr、Mo、W等掺杂的FeSi2合金阳极，并力争实现晶态和非晶合金材料的可控制备，深入研究它们在碱性电解液中的抗腐蚀特性和在金属-空气电池中的电化学特性与反应机理，目的是筛选出性能最佳的硅基合金阳极材料。

Silicon, as an anode material for metal-air battery, has a very high energy density of 8470Wh/kg, even higher than Al. However, because of its low conductivity, Si did not display satisfying performance in metal-air battery tests. This proposal aim to study a potentially excellent silicon based alloy anode - FeSi2, which has good conductivity, high theoretical energy density, and low cost, but with shortcoming of inability to resist corrosion in basic electrolyte. The applicant has made Ti doped FeSi2 materials using melt spin quenching method and found they showed good anti-corrosion performance in KOH electrolyte and displayed a very high energy density of 2128Wh/kg, and a metal-air battery based on this anode will have 6 times the energy density of lithium ion batteries. This proposal plans to synthesize a series of metals such as Ti, Cr, Mo, and W doped FeSi2 as high energy anodes and realize the controlled synthesis of crystal type and amorphous type FeSi2 alloys. This proposal will study the anti-corrosion performance of various doped FeSi2 and elucidate their electrochemical properties and reaction mechanism in metal-air batteries, the goal being to search for the best silicon based alloy anodes.