The commercialization of all‐solid‐state Li batteries (ASSLBs) demands solid electrolytes with strong cost‐competitiveness, low density (for enabling satisfactory energy densities), and decent anode compatibility (the need for cathode compatibility can be circumvented by the cathode coating techniques that are widely applied in sulfide‐based ASSLBs). However, none of the reported oxide, sulfide, or chloride solid electrolytes meets these requirements simultaneously. Here, we design a Li7P3S7.5O3.5 (LPSO) solid electrolyte, which shows a combination of all the aforementioned characteristics. The synthesis of this material does not need the expensive Li2S, so the raw materials cost is only $14.42/kg, which, unlike most solid electrolytes, lies below the $50/kg threshold for commercialization. The density of LPSO is 1.70 g cm‐3, considerably lower than those of the oxide (typically above 5 g cm‐3) and chloride (around 2.5 g cm‐3) solid electrolytes. Besides, LPSO also shows excellent anode compatibility. The Li | LPSO | Li cell cycles stably with a potential of ~50 mV under 0.1 mA cm‐2 for over 4200 h at 25 °C, and the all‐solid‐state pouch cell with the Si anode shows a capacity retention of 89.29% after 200 cycles under 88.6 mA g‐1 at 60 °C.

中文翻译：

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一种具有低密度和优异阳极兼容性的经济高效的硫化物固体电解质Li7P3S7.5O3.5


全固态锂电池（ASSLB）的商业化需要固体电解质具有很强的成本竞争力、低密度（以实现令人满意的能量密度）和良好的阳极兼容性（可以通过阴极涂层技术来规避对阴极兼容性的需求）广泛应用于硫化物基 ASSLB）。然而，所报道的氧化物、硫化物或氯化物固体电解质都不能同时满足这些要求。在这里，我们设计了一种 Li7P3S7.5O3.5 (LPSO) 固体电解质，它显示了所有上述特性的组合。该材料的合成不需要昂贵的Li2S，因此原材料成本仅为14.42美元/kg，与大多数固体电解质不同，低于商业化的50美元/kg门槛。 LPSO的密度为1.70 g cm-3，远低于氧化物（通常高于5 g cm-3）和氯化物（约2.5 g cm-3）固体电解质的密度。此外，LPSO还表现出优异的阳极兼容性。李| LPSO |锂电池在 0.1 mA cm-2 下以约 50 mV 的电位在 25 °C 下稳定循环超过 4200 小时，并且采用硅阳极的全固态软包电池在 200 次循环后显示出 89.29% 的容量保持率。 60 °C 时为 88.6 mA g-1。