Recent Advances in Filler Engineering of Polymer Electrolytes for Solid-State Li-Ion Batteries: A Review

Abstract

Solid-state Li-ion batteries (SSBs) have been regarded as the most promising systems to power electronic devices and electric vehicles because of their high energy density and safety. As the key component of SSBs, solid electrolytes have a substantial influence on battery performance. In recent years, polymeric composite electrolytes (PCEs) that combine polymer electrolytes with various fillers have attracted tremendous attention as a result of their high mechanical flexibility, high interfacial compatibility with electrodes, and easy processability. In this review, we provide a comprehensive summary of the recent progress in filler engineering of polymer electrolytes for SSBs. First, the challenges facing PCEs associated with the physical and chemical strategies for dispersing fillers are discussed. Then, the latest research papers regarding various fillers used in PCEs are classified and reviewed in detail. Moreover, their effects on physical and electrochemical properties, interfacial stability, and Li+-migration mechanisms are discussed, with the aim of improving the understanding of filler-reinforced PCEs for the development of SSBs.

Ultrathin Yet Robust Single Lithium‐Ion Conducting Quasi‐Solid‐State Polymer‐Brush Electrolytes Enable Ultralong‐Life and Dendrite‐Free Lithium‐Metal Batteries

“…What is worse, introduction of plasticizers for high ion conductivity further decreases the mechanical property of QSPEs, which conversely requires greatly increased membrane thickness. Although crosslinking and adding fillers are common strategies to enhance the mechanical property of QSPEs to a certain extent, [12,13,19,20] most QSPEs still have ≈100-1000 µm in thickness and thus will further deteriorate the volume energy density of LMBs, which has been one of the key roadblocks for the ultimate replacement of internal combustion vehicles by electric vehicles. [19] Therefore, how to balance the plasticizer-related ion conductivity and thicknessdependent mechanical property of QSPEs is still a great challenge in LMBs.…”

Functional additives for solid polymer electrolytes in flexible and high‐energy‐density solid‐state lithium‐ion batteries

“…Despite the enhanced electrochemical and mechanical performance by solid additives, it is undeniable that the agglomeration of such additives in the SPEs is still one of the obstacles to practical application. 66…”

“…74 Besides, organic-matter-based additives have attracted extensive attention and shown great potential to improve the electrochemical performance of SPEs. 66,80 Among these organic-matter-based compounds, metal-organic frameworks (MOFs) consist of metal ions or clusters coordinated to organic ligands to form periodic network structures with open crystalline structures, large surface areas, and pore volumes. Yuan et al, for the first time, introduced MOF-5 (Zn 4 O (BDC) 3 ; BDC stands for 1,4-benzene dicarboxylate) as a filler for PEO-based electrolytes.…”

Metal Halide Perovskites for Energy Storage Applications

“…To date, Li-ion based battery showed highest capacity of 3860 mA h g À 1 . [31] Many works have been done for the Saranya Narayanan is currently a research fellow at Department of Solar Energy, Pandit Deendayal Petroleum University, India. Her research interest is to study the electronic and optical properties of the halide perovskites based devices.…”