Rationally Designed Li–Ag Alloy with In-Situ-Formed Solid Electrolyte Interphase for All-Solid-State Lithium Batteries,ACS Applied Materials & Interfaces

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Rationally Designed Li–Ag Alloy with In-Situ-Formed Solid Electrolyte Interphase for All-Solid-State Lithium Batteries
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2024-07-22 , DOI: 10.1021/acsami.4c08541
Ye-Eun Park ₁ , Myung-Keun Oh ₂ , Hui-Tae Sim ₂ , Hyo-Jin Kim ₁ , Yun-Sun Cho ₃ , Seong-Jin Park ₃ , Dong-Won Kim _{1,

2}

Affiliation

All-solid-state lithium batteries (ASSLBs) with sulfide-based solid electrolytes have attracted significant attention as promising energy storage devices, owing to their high energy density and enhanced safety. However, the combination of a lithium metal anode and a sulfide solid electrolyte results in performance degradation, owing to lithium dendrite growth and the side reactions of lithium metal with the solid electrolyte. To address these issues, a Ag-based Li alloy with a favorable solid electrolyte interphase (SEI) was prepared using electrodeposition and applied to the ASSLB as an anode. The electrochemically formed SEI layer on the Li–Ag alloy primarily comprised LiF and Li₂O with high mechanical strength and Li₃N with high ionic conductivity, which suppressed the formation of lithium dendrites and short-circuiting of the cell. The symmetric cell with the Li–Ag alloy achieved a critical current density of 1.6 mA cm^–2 and maintained stable cycling for over 2000 h at a current density of 0.6 mA cm^–2. Consequently, the all-solid-state lithium cell assembled with the Li–Ag alloy anode with SEI, Li₆PS₅Cl solid electrolyte, and LiNi_0.78Co_0.10Mn_0.12O₂ cathode delivered a high discharge capacity of 185 mAh g^–1 and exhibited good cycling performance in terms of cycling stability and rate capability at 25 °C.

中文翻译：

用于全固态锂电池的合理设计的具有原位形成固体电解质界面的锂银合金

具有硫化物固体电解质的全固态锂电池（ASSLB）由于其高能量密度和增强的安全性而作为有前途的储能设备而引起了广泛关注。然而，由于锂枝晶的生长以及锂金属与固体电解质的副反应，锂金属阳极和硫化物固体电解质的组合导致性能下降。为了解决这些问题，采用电沉积法制备了具有良好固体电解质界面（SEI）的银基锂合金，并将其作为阳极应用于ASSLB。在Li-Ag合金上电化学形成的SEI层主要由具有高机械强度的LiF和Li ₂ O以及具有高离子电导率的Li ₃ N组成，抑制了锂枝晶的形成和电池的短路。采用Li-Ag合金的对称电池实现了1.6 mA cm ^–2的临界电流密度，并在0.6 mA cm ^–2的电流密度下保持稳定循环超过2000小时。因此，由具有SEI的Li-Ag合金负极、Li ₆ PS ₅ Cl固体电解质和LiNi _0.78 Co _0.10 Mn _0.12 O ₂正极组装而成的全固态锂电池具有185 mAh g ^–1的高放电容量。在25℃下的循环稳定性和倍率性能方面表现出良好的循环性能。

更新日期：2024-07-22

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