Review on composite polymer electrolyte using PVDF-HFP for solid-state lithium-ion battery

Solid-state lithium-ion batteries with composite polymer electrolytes are considered to be one of the most apparent technology to lead in the world of batteries. The primary upside of such batteries is their addressed safety issues followed by good flexibility along with mechanical strength and improved interfacial conditions. Among various polymers, poly (vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) has exhibited to be potential enough to easily dissociate lithium salts as it is enriched with strong electron withdrawing groups. Along the years, researchers have introduced various methods by which the ionic conductivity and the overall performance have effectively improved. Hence, in this review we briefly discuss the recent progress and major contributions of several passive and active fillers in composite polymer electrolytes (CPEs) and how they consequently impact the overall cell performance. The unique mechanisms as well as effects of fillers with respect to their dimension, optimal quantity and type and how they can overcome the limitations of conventional solid polymer electrolytes (SPEs) are detailed here. Mostly the factors affecting the ionic conductivity and overall cell performance in PVDF-HFP based CPEs are intensively reviewed. Finally, we evaluated the improvisions made to diminish the electrode-electrolyte interfacial resistance which contributes a major role in all solid-state batteries.