The recent development of salt-concentrated electrolytes with fire-retarding solvents has paved the route to resolve the safety concerns of electrolytes in Li-ion batteries. However, these salt-concentrated electrolytes have an inherently high viscosity and low wettability on commercially dominant polymeric separators, which inhibits them from filling the pores of separators and electrodes leading to performance issues in the battery. Here we report electrode (cathode)-coated zeolite (silicalite) separators synthesized using a scalable blade-coating process. These separators show a much higher wettability and electrolyte uptake towards these electrolytes due to their higher surface energy and intra-particle micropores, resulting in a uniform Li-ion concentration gradient. The zeolite separator also has a much higher porosity (80%) than the PP (39%) separator resulting in a higher electrolyte loading and hence upgraded electrochemical performance. These coated zeolite separators when used in full cells with salt-concentrated electrolytes demonstrate a 15% higher charge retention in long-term cycling and lower charge transfer and SEI resistance compared to the PP separator, as a result of a more uniform lithium ion concentration profile. Moreover, with 1C-rate cycling, the silicalite separator realizes about 20% higher capacity than the PP separator, while losing about 11% of its capacity as compared to the 25% capacity lost by the PP separator, post 50 cycles. The combination of non-combustible, highly electrolyte wettable and industrially scalable zeolite separators combined with a fire-retarding electrolyte provides an effective approach for developing high performance and safe Li-ion batteries.

中文翻译：

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完全由无机电极涂覆的硅沸石隔板实现的安全锂离子电池

含阻燃溶剂的含盐电解质的最新发展为解决锂离子电池中电解质的安全性问题铺平了道路。然而，这些盐浓缩的电解质在商业上占主导地位的聚合物隔板上具有固有的高粘度和低润湿性，这抑制了它们填充隔板和电极的孔，从而导致电池性能问题。在这里，我们报告使用可扩展的刮刀涂层工艺合成的电极（阴极）涂层沸石（硅沸石）隔板。这些隔板由于其较高的表面能和颗粒内的微孔而表现出更高的润湿性和对这些电解质的吸收，从而导致均匀的锂离子浓度梯度。沸石隔板也具有比PP隔板（39％）高得多的孔隙率（80％），从而导致更高的电解质负载并因此提高了电化学性能。与聚丙烯隔膜相比，这些覆膜的沸石隔膜在与含盐的电解质混合的全电池中使用时，与聚丙烯隔膜相比，在长期循环中的电荷保留率提高了15％，电荷转移和抗SEI性降低了。而且，在1C速率循环下，硅沸石隔离器比PP隔离器的容量高出约20％，而在50个循环后，与PP隔离器的容量损失25％相比，其容量损失了约11％。结合不燃，