Highly dispersed silver nanoparticles for performance-enhanced lithium oxygen batteries
作者：Z. Luo, F. Li, C. Hu, L. Yin, D. Li, C. Ji, X. Zhuge, K. Zhang*, K. Luo*
關鍵字：Silver nanoparticle, Lithium oxygen battery, Performance, Amorphous lithium peroxide, Oxygen reduction intermediate
論文來源：期刊
具體來源：Journal of Materials Science & Technology 73 (2021) 171–177
發表時間：2020年
Aprotic lithium-oxygen batteries possess ultrahigh energy density but suffer from the sluggish decomposition of discharge product, quick depletion of Li anode and cleavage of electrolyte, in close associationwith oxygen reduction reaction at the cathode. Herein, highly dispersed silver nanoparticles are used toenhance the lithium-oxygen battery with 1.0 M lithium perchlorate in dimethyl sulfoxide. It is observedthat fifilm-like amorphous lithium peroxide is formed through surface pathway instead of bulk crystals,due to the incorporation of silver nanoparticles dispersed in the electrolyte, which subsequently accelerates the decomposition of the discharge product by offering more active sites and improved conductivity.The released silver nanoparticles after battery charging can be re-used in the following cycles. Experiments and theoretical calculation further indicate that the suspended silver nanoparticles can adsorb thesoluble oxygen reduction intermediates, which are responsible for the alleviation of oxidative cleavageof electrolyte and corrosion of lithium anode. The lifespan of lithium oxygen batteries is therefore signifificantly extended from 55 to 390 cycles, and the rate performance and full-discharge capacity are alsolargely enhanced. The battery failure is attributed to the coalescence and growth of silver nanoparticlesin the electrolyte, and further improvement on colloid stability is underway.