Scalable Li1.5Al0.5Ge1.5(PO₄)₃ thin membrane prepared by tape-casting for large-scale lithium–air battery application

Yaqi Zhua*, Gongxuan Chenb, Jianguo Suna , Jiakai Wangc, Tian Wub, Wei Daib & Li Lu*ada Department of Mechanical Engineering, National University of Singapore, Singapore, Singaporeb College of Chemistry and Life Science, Institute of Materials Research and Engineering, Hubei University of Education, Wuhan, P.R. Chinac School of Materials Science and Engineering, Hubei University, Wuhan, P.R. Chinad National University of Singapore Suzhou Research Institute, Suzhou, P. R. ChinaCONTACT Li Lu mpeluli@nus.edu.sg Department of Mechanical Engineering, National University of Singapore, Singapore 117575, Singapore* Current address: Department of Mechanical and Aerospace Engineering, Missouri University of Science and Technology, USAABSTRACTThin NASICON-type Li1.5Al0.5Ge1.5(PO4)3 solid electrolyte membrane is successfully fabricated through tape-casting. A high density of 3.28 g cm−3 of the membrane with a porosity of 4.5% has been achieved when it is sintered at 900°C for 11 h. The membrane shows a comparative ionic conductivity with that of the glass-ceramic pellets. The total ionic conductivity of the present membrane is 2.62 × 10–4 S cm−1 at room temperature, and it maintains a stable conductivity of 1.3 × 10–4 S cm−1 in a 0.5 M LiOH and 0.5 M Li3PO4 buffer solution, which can fully afford the requirements of the membrane used in lithium–air batteries.Graphical AbstractHigh-density thin LAGP membrane with comparative ionic conductivity has been successfully prepared by tape-casting, which can fully afford the essential requirements of using in Li–air battery.