Dendrite-Free Potassium Metal Anode Using Potassium Polysulfide via Spontaneous Chemical Reactions
발표자
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초록
내용
Due to abundance(2.09 wt%) and low cost, K metal batteries(KMBs) are promising alternatives to Li-ion batteries. KMBs have high theoretical capacity(686 mAh g-1) and low oxidative reduction potential(-2.93 V vs. SHE). However, K metal anode has high chemical reactivity inducing decomposition of the electrolyte and dendrite growth during plating/stripping. In this presentation, I’ll show simple interface control method to inhibit dendrites forming stable solid electrolyte interphase(SEI) of K2S on K metal anode. When liquid potassium-polysulfide(PPS) and K metal are in contact, a conductive passivation layer K2S was formed by spontaneous chemical reactions with high electron, ionic conductivity achieving dense and dendrite-free surface. K metal anode with K2S show good cycling stability in full cell test using TiS2 cathode compared to the bare K metal anode.
Reference [1] Sun et al. ACS Energy Lett. 2018, 3, 540−541