%0 Journal Article
%T Long-lifetime aqueous Si-air batteries prepared by growing multi-dimensionally tunable ZIF-8 crystals on Si anodes.
%A Zhang X
%A Deng F
%A Liu Z
%A Yu Y
%J J Colloid Interface Sci
%V 674
%N 0
%D 2024 Jun 20
%M 38950471
%F 9.965
%R 10.1016/j.jcis.2024.06.134
%X Si-air batteries have a high energy density, high theoretical voltage, and long lifetime, but they present a low anode utilization rate in a potassium hydroxide electrolyte. In this work, a ZIF-8 protective layer was prepared and modulated by a secondary growth method and then applied to protect the Si flat and Si nanowire (NW) anodes of a Si-air battery. By adjusting the conversion ratio, particle size, and crystallinity of ZIF-8 on the Si surface, the contact mode of the Si anode with water and OH- was controlled, thus achieving long-term corrosion and passivation resistance. Si NWs@ZIF-8 exhibited the highest average discharge voltage of 1.16 V, and the Si flat@ZIF-8 anode achieved the longest discharge time of 420 h. This work confirms that ZIF-8 acts as an anode protective layer to improve the properties of Si-air batteries and also provides valuable insights into the protection of Si anodes by MOFs.