A Novel Strategy to Overcome the Hurdle for Commercial All-Solid-State Batteries via Low-Cost Synthesis of Sulfide Solid Electrolytes,Small Methods

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A Novel Strategy to Overcome the Hurdle for Commercial All-Solid-State Batteries via Low-Cost Synthesis of Sulfide Solid Electrolytes
Small Methods ( IF 10.7 ) Pub Date : 2021-09-15 , DOI: 10.1002/smtd.202100793
Min-Ju Kim _{1,

2} , Ik-Hyeon Choi ₁ , Seong Chan Jo _{1,

2} , Byung Gon Kim ₁ , Yoon-Cheol Ha ₁ , Sang-Min Lee ₁ , Sung Kang ₃ , Kang-Jun Baeg ₂ , Jun-Woo Park ₁

Affiliation

Unlike commercial lithium-ion batteries, the high cost and low ionic conductivity of solid electrolytes (SEs) continues to be a big hurdle in commercially available all-solid-state batteries (ASSBs). Rather than the conventional dry-process and high-energy ball milling processes, the productive solution synthesis of bulk-type SEs is the most crucial issue in the successful application of high-energy-density ASSBs. In this study, the way is paved to overcome the hurdle for commercial lithium phosphorus sulfide chloride (LPSCl) SEs via a readily processable bulk-type solution-based synthesis without acquiring any high-energy ball-milling processes. By incorporating an elemental sulfur additive during the preparation process, Li₂S and S form a polysulfide, and P₂S₅ is induced to react readily to provide LPSCl with excellent ion conductivity as high as 1.8 mS cm⁻¹. Surprisingly, the purity of bulk type precursors does not affect the final composition and ionic conductivity of sulfide electrolytes, which show the same electrochemical characteristics of ASSB cells with a high discharge capacity of 185.6 mA h g⁻¹. The study offers a promising strategy for saving the production cost of sulfide SEs, possibly up to 92%, and their commercial ASSBs are expected to be achieving a competitive cost per energy density of ≈0.46 $ W⁻¹.

中文翻译：

一种通过低成本合成硫化物固体电解质来克服商用全固态电池障碍的新策略

与商用锂离子电池不同，固体电解质 (SE) 的高成本和低离子电导率仍然是商用全固态电池 (ASSB) 的一大障碍。与传统的干法和高能球磨工艺不同，批量SEs的生产溶液合成是高能量密度ASSBs成功应用的最关键问题。在这项研究中，通过易于加工的基于溶液的本体型合成，无需任何高能球磨工艺，就为克服商用硫化锂磷氯化物 (LPSCl) SE 的障碍铺平了道路。通过在制备过程中加入元素硫添加剂，Li ₂ S 和 S 形成多硫化物，P ₂ S ₅诱导容易反应以提供具有高达 1.8 mS cm ^{-1 的}优异离子电导率的 LPSCl 。令人惊讶的是，块状前体的纯度不影响硫化物电解质的最终组成和离子电导率，硫化物电解质显示出与具有 185.6 mA hg ^-1高放电容量的 ASSB 电池相同的电化学特性。该研究为节省硫化物 SE 的生产成本提供了一种很有前景的策略，可能高达 92%，并且它们的商业 ASSB 有望实现每能量密度 ≈0.46 $ W ^{-1 的}有竞争力的成本。

更新日期：2021-11-12

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