AUTHOR=Jia Gaoshuai , Deng Zhi , Ni Dixing , Ji Zhaoran , Chen Diancheng , Zhang Xinxin , Wang Tao , Li Shuai , Zhao Yusheng 

TITLE=Temperature-dependent compatibility study on halide solid-state electrolytes in solid-state batteries

JOURNAL=Frontiers in Chemistry

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2022.952875

DOI=10.3389/fchem.2022.952875

ISSN=2296-2646

ABSTRACT=<p>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<sub>3</sub>InCl<sub>6</sub> and anti-perovskite-type Li<sub>2</sub>OHCl, show good thermal stability with oxides LiCoO<sub>2</sub>, LiMn<sub>2</sub>O<sub>4</sub>, and Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> up to 320 °C. Moreover, anti-perovskite-type Li<sub>2</sub>OHCl shows a chemical reactivity with other battery materials (eg., LiFePO<sub>4</sub>, LiNi<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub>, Si-C, and Li<sub>1.3</sub>Al<sub>0.3</sub>Ti<sub>1.7</sub>(PO<sub>4</sub>)<sub>3</sub>) at 320°C, which reaches the melting point of Li<sub>2</sub>OHCl. It indicated that Li<sub>2</sub>OHCl has relatively high chemical reactivity after melting. In contrast, rock-salt-type Li<sub>3</sub>InCl<sub>6</sub> shows higher stability and interfacial compatibility. This work delivers insights into the selection of suitable battery materials with good compatibility for ASSLBs.</p>