Recent progress in polymer garnet composite electrolytes for solid-state lithium metal batteries

The electrolyte plays a prominent role in rechargeable batteries as it decides the safety and performance of the device. The commercialized Li-ion battery consists of a liquid electrolyte (lithium salt dissolved organic solvents) and electrodes which are separated by a Celgard membrane separator. Due to the limitations of liquid electrolytes, recent research activities focused on solid-state electrolytes instead of liquid electrolytes to produce safer and more efficient devices. Polymer garnet composite electrolytes (PGCEs) have advantages over both liquid electrolytes and solid-state electrolytes and in addition, PGCEs overcome the limitations of liquid electrolytes leading to a safer and more efficient battery. Herein, discussed is a detailed report of various polymers and their blend-based garnet composite polymer electrolytes for solid-state lithium metal batteries. There exist a multitude of polymer garnet composite electrolytes for making solid-state lithium metal batteries. Among those considered for review are (i) polyethylene oxide based PGCEs, (ii) polyvinyldinefluoride based PGCEs, (iii) polyvinylidenefluoride-co-hexafluoropropylene based PGCEs, (iv) polyacrylonitrile based PGCEs, (v) polypropylene carbonate based PGCEs, (vi) polymethyl methacrylate based PGCEs, (vii) polytetrafluoroethylene based PGCEs, (viii) polyethylene glycol diacrylate based PGCEs and (ix) polyester based PGCEs.