Temperature-dependent compatibility study on halide solid-state electrolytes in solid-state batteries
Gaoshuai Jia, Zhi Deng, Dixing Ni, Zhaoran Ji, Diancheng Chen, Xinxin Zhang, Tao Wang, Shuai Li, Yusheng Zhao
Abstract
All-solid-state lithium batteries (ASSLBs) have attracted much attention owing to their high safety and energy density compared to conventional organic electrolytes. However, the interfaces between solid-state electrolytes and electrodes retain some knotty problems regarding compatibility. Among the various SSEs investigated in recent years, halide SSEs exhibit relatively good interfacial compatibility. The temperature-dependent interfacial compatibility of halide SSEs in solid-state batteries is investigated by thermal analysis using simultaneous thermogravimetry and differential scanning calorimetry (TG–DSC) and X-ray diffraction (XRD). Halide SSEs, including rock-salt-type Li 3 InCl 6 and anti-perovskite-type Li 2 OHCl, show good thermal stability with oxides LiCoO 2 , LiMn 2 O 4 , and Li 4 Ti 5 O 12 up to 320 °C. Moreover, anti-perovskite-type Li 2 OHCl shows a chemical reactivity with other battery materials (eg., LiFePO 4 , LiNi 0.8 Co 0.1 Mn 0.1 O 2 , Si-C, and Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 ) at 320°C, which reaches the melting point of Li 2 OHCl. It indicated that Li 2 OHCl has relatively high chemical reactivity after melting. In contrast, rock-salt-type Li 3 InCl 6 shows higher stability and interfacial compatibility. This work delivers insights into the selection of suitable battery materials with good compatibility for ASSLBs.