Stabilizing the Interface of NASICON Solid Electrolyte against Li Metal with Atomic Layer Deposition

• DOI: 10.1021/acsami.8b06366
• Publication Date: 2018-08-24T16:16:35Z
• Authors: Yulong Liu; Qian Sun; Yang Zhao; Biqiong Wang; Payam Kaghazchi; Keegan R. Adair; Ruying Li; Cheng Zhang; Jingru Liu; Liang-Yin Kuo; Yongfeng Hu; Tsun-Kong Sham; Li Zhang; Rong Yang; Shigang Lu; Xiping Song; Xueliang Sun
• Keywords: Fast ion conductor; Electrochemical window

Solid-state batteries have been considered as one of the most promising next-generation energy storage systems because their high safety and density. electrolytes are key component solid-state battery, which exhibit ionic conductivity, good chemical stability, wide electrochemical windows. LATP [Li1.3Al0.3Ti1.7 (PO4)3] solid electrolyte has widely investigated for its conductivity. Nevertheless, instability against Li metal hindered application in batteries. Here, we propose that atomic layer deposition (ALD) coating on surfaces is able to stabilize LATP/Li interface by reducing side reactions. In comparison with bare LATP, Al2O3-coated ALD exhibits a stable cycling behavior smaller voltage hysteresis 600 h, well small resistance. More importantly, basis advanced characterizations such high-resolution transmission electron spectroscope-electron loss spectroscopy, lithium penetration into bulk Ti4+ reduction significantly limited. The results suggest very effective improving electrolyte/electrode stability.