A Cost-Effective Sulfide Solid Electrolyte Li7P3S7.5O3.5 with Low Density and Excellent Anode Compatibility

H Li and QS Lin and JZ Wang and L Hu and F Chen and ZH Zhang and C Ma, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 63, e202407892 (2024).

DOI: 10.1002/anie.202407892

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 cost- (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 vertical bar LPSO vertical bar Li cell cycles stably with a potential of similar to 50 mV under 0.1 mA cm(-2) for over 4200 h at 25 degrees 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 degrees C.

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