The instability of Li10GeP2S12 toward moisture and that toward lithium metal are two challenges for the application in all‐solid‐state lithium batteries. In this work, Li10GeP2S12 is fluorinated to form a LiF‐coated core–shell solid electrolyte LiF@Li10GeP2S12. Density‐functional theory calculations confirm the hydrolysis mechanism of Li10GeP2S12 solid electrolyte, including H2O adsorption on Li atoms of Li10GeP2S12 and the subsequent PS43− dissociation affected by hydrogen bond. The hydrophobic LiF shell can reduce the adsorption site, thus resulting in superior moisture stability when exposing in 30% relative humidity air. Moreover, with LiF shell, Li10GeP2S12 shows one order lower electronic conductivity, which can significantly suppress lithium dendrite growth and reduce the side reaction between Li10GeP2S12 and lithium, realizing three times higher critical current density to 3 mA cm−2. The assembled LiNbO3@LiCoO2/LiF@Li10GeP2S12/Li battery exhibits an initial discharge capacity of 101.0 mAh g−1 with a capacity retention of 94.8% after 1000 cycles at 1 C.
Based on the superhydrophilicity of titanium dioxide (TiO 2 ) after ultraviolet irradiation, it has a high potential in the application of antifogging. However, a durable superhydrophilic state and a broader photoresponse range are necessary. Considering the enhancement of the photoresponse of TiO 2 , doping is an effective method to prolong the superhydrophilic state. In this paper, a Fe 3+ doped TiO 2 film with long-lasting superhydrophilicity and antifogging is prepared by sol−gel method. The experiment and density-functional theory (DFT) calculations are performed to investigate the antifogging performance and the underlying microscopic mechanism of Fe 3+ doped TiO 2 . Antifogging tests demonstrate that 1.0 mol % Fe 3+ doping leads to durable antifogging performance which lasts 60 days. The DFT calculations reveal that the Fe 3+ doping can both increase the photolysis ability of TiO 2 under sunlight exposure and enhance the stability of the hydroxyl adsorbate on TiO 2 surface, which are the main reasons for a longlasting superhydrophilicity of TiO 2 after sunlight exposure.
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