Origin of the Outstanding Performance of Dual Halide Doped Li7P2S8X (X = I, Br) Solid Electrolytes for All-Solid-State Lithium Batteries,ACS Applied Energy Materials

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Origin of the Outstanding Performance of Dual Halide Doped Li7P2S8X (X = I, Br) Solid Electrolytes for All-Solid-State Lithium Batteries
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-01-06 , DOI: 10.1021/acsaem.0c02321
Anh Dinh Bui _{1,

2} , Sun-Hwa Choi ₁ , Haeyoung Choi ₁ , You-Jin Lee ₁ , Chil-Hoon Doh _{1,

2} , Jun-Woo Park ₁ , Byung Gon Kim ₁ , Won-Jae Lee ₁ , Sang-Min Lee ₁ , Yoon-Cheol Ha ₁

Affiliation

Halide-doped sulfide solid electrolytes have attracted great attention due to their high lithium-ion conductivity, Li-metal compatibility, and deformability for use in all-solid-state Li batteries. Although the effects of halide mixing in Li₆PS₅X and Li₄PS₄X (X = halogen) solid electrolytes are fully investigated, studies on the origin of the remarkable increase in the ionic conductivity by dual halide doped Li₇P₂S₈X (X = I, Br) solid electrolytes are scarce. Here, we systematically investigate the crystal phase evolution in glassy matrix and the corresponding ionic conductivity variation, revealing that a metastable Li₁₀GeP₂S₁₂-like Li₃PS₄ phase with halide-doped glassy matrix is responsible for the outstanding performance.

中文翻译：

全固态锂电池双卤化物掺杂的Li ₇ P ₂ S ₈ X（X = I，Br）固体电解质卓越性能的起源

掺卤化物的硫化物固体电解质由于其高的锂离子传导性，锂金属的相容性以及用于全固态锂电池的可变形性而备受关注。尽管已充分研究了卤化物在Li ₆ PS ₅ X和Li ₄ PS ₄ X（X =卤素）固体电解质中混合的影响，但对掺杂双卤化物的Li ₇ P ₂ S引起的离子电导率显着增加的起因进行了研究。缺少₈ X（X = I，Br）固体电解质。在这里，我们系统地研究了玻璃态基质中的晶体相演变以及相应的离子电导率变化，揭示了亚稳态的Li ₁₀ GeP具有卤化物掺杂的玻璃状基质的₂ S ₁₂状Li ₃ PS ₄相具有出色的性能。

更新日期：2021-01-25

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