All-Solid-State battery

All-solid-state battery (ASSB) is a battery system that utilizes solid electrodes and solid electrolytes, instead of the liquid electrolytes found in commercial LIBs. Major research in our lab consist of inorganic solid electrolytes including oxides and sulfides. ASSBs are inherently safe and high energy density systems, but still are premature technology in overall performances.

• Achieving higher energy density

• Non-flammable, ultra-stable

• Bipolar cell configuration applicability

• High chemical/electrochemical stability

• High electrochemical oxidation voltage

• High mechanical property

• Expensive mass production cost

• Brittle property a point contact

   → grain boundary/interfacial resistance

– Garnet type – Li7La3Zr2O12 (LLZO)

– NASICON type – Li1.3Al0.3Ti1.7(PO4)3(LATP),

 Li1.3Al0.3Ge1.7(PO4)3 (LAGP)

– Perovskite type – Li0.5La0.5TiO3 (LLTO) 

• Excellent ionic conductivity

• Great mechanical flexibility a good contact  property

• Low grain boundary resistance

• Sensitive to moisture, emitting toxic gas

• Low oxidation stability

• Poor compatibility with active materials

– LGPS group – Li10GeP2S12

– Argyrodite type – Li6PS5Cl

– Thio-LISICON type – Li3.25Ge0.25P0.75S4

– Glass-ceramic type – Li7P3S11 (LPS)