Conversion/alloying anode materials exhibiting high K storage capacities suffer from large volume variations and unstable electrode/electrolyte interfaces upon cycling. Herein, taking SnS/reduced graphene oxide (SnS/rGO) anodes as an example, the electrochemical performance of SnS/rGO could significantly be improved via employing potassium bis(fluorosulfonyl)imide (KFSI) salt in electrolytes and ultrathin TiO₂ coating. KF-rich inorganic layer was demonstrated to help form robust SEI layer, which could suppress the side reactions to increase the Coulombic efficiency. The formed potassiated K_xTiO₂ coating layer was constructed to boost charge transfer capability and K-ion diffusion kinetics. The as-prepared SnS/rGO@TiO₂-20 electrode in KFSI electrolyte delivers the high CE of 99.1% and 424 mAh·g⁻¹ after 200 cycles with an ultrahigh capacity retention of 98.5%.

表现出高钾存储容量的转化/合金阳极材料在循环时遭受大的体积变化和不稳定的电极/电解质界面。在此，以SnS/还原氧化石墨烯（SnS/rGO）阳极为例，通过在电解质中使用双（氟磺酰）亚胺钾（KFSI）盐和超薄TiO ₂涂层，可以显着提高SnS/rGO的电化学性能。富含 KF 的无机层被证明有助于形成坚固的 SEI 层，这可以抑制副反应以提高库仑效率。所形成的钾化K _x TiO ₂涂层被构建以提高电荷转移能力和K离子扩散动力学。所制备的 SnS/rGO@TiO ₂KFSI 电解液中的 -20 电极在200 次循环后提供 99.1% 的高 CE 和 424 mAh·g ^-1以及 98.5% 的超高容量保持率。