Research progress in stable interfacial constructions between composite polymer electrolytes and electrodes

Abstract

Recent advances in interfacial constructions between composite polymer electrolytes and electrodes are reviewed. Moreover, the mechanisms of the interfacial contact, ionic migration, and electrochemical reactions between them are highlighted.

Gel Polymer Electrolytes Design for Na‐Ion Batteries

“…Meanwhile, fillers may participate in the formation of a stable interfacial layer and thus improve the cycling performance of batteries. [61,[92][93][94][95] Two examples are provided as follows:…”

“…[ 12–16 ] In contrast, polymer solid‐state electrolytes (including polyethylene oxide, polyacrylonitrile, polymethylmethacrylate, and polyvinylidene fluoride) possess flexibility and improved interfaces, but the low ionic conductivity limits the applications. [ 17–74 ] Therefore, the gel polymer electrolyte (GPE) with combined advantages of liquid electrolytes and polymer electrolytes to achieve high ionic conductivity and good interfacial contact have drawn great attention in recent years. Besides, the addition of inorganic electrolytes or fillers can further improve their thermal stability and mechanical properties.…”

Recent achievements of free‐standing material and interface optimization in high‐energy‐density flexible lithium batteries

“…The composite electrolytes combining the fast Li ion transfer capacity of CSEs and the flexibility of PSEs is an optimal choice for FLBs. [8,[82][83][84] Recently, Wachsman's group has constructed a 3D Li + conductive composite polymer electrolytes by introducing polymer electrolytes into 3D garnet-based inorganic ceramic framework with the help of a template-assisted method (Figure 7a). The Li||Li symmetrical batteries with 3D composite polymer electrolytes exhibit stable cycling within 500 h. [35] In addition to the template method, electrospinning technology is also applied to build flexible and stretchable composite polymer electrolytes.…”

“…The composite electrolytes combining the fast Li ion transfer capacity of CSEs and the flexibility of PSEs is an optimal choice for FLBs. [ 8,82–84 ]…”

Building a rigid-soft coupling interphase by a reduction–oxidation collaborative approach with lithium difluorobis(oxalato) phosphate additives

“…14,15 Great efforts have been devoted to enhancing the modulus by increasing the content of LiF (modulus of 75 GPa) in SEI layers, such as introducing F-containing compounds as additives and increasing the lithium salt concentration. [16][17][18][19][20][21] However, a LiFrich layer tends to suppress the subsequent electrolyte electrochemical decomposition, and thus reduces the amount of so organic compounds, resulting in a rigid but fragile SEI layer. The problems are partly resolved using an articial SEI layer, which is constructed as a multilayer with a stiff inorganic-rich inner and a so organic-rich outer layer.…”