Structural Design of Composite Polymer Electrolytes for Solid‐state Lithium Metal Batteries

Abstract

Composite polymer electrolytes with good safety and improved electrochemical performance have attracted widespread attention. However, the ion conduction ability at room temperature and interface compatibility between the electrolyte and electrode still face huge challenges, which greatly hinders the overall performance of solid‐state batteries. Therefore, the focus of this review is on the impact of the composite electrolyte structure on its ion conduction ability and interfacial compatibility, including physical contact of the electrolyte with electrodes, formation of lithium dendrites and space charge layer, adapting to high‐voltage cathode, as well as corresponding solving strategies. Moreover, the structural design‐based ion transport mechanism is highlighted, and the inorganic component with 0D, 1D, 2D, 3D and vertical structure are summarized. The purpose here is to outline the problems and challenges in structural design of composite electrolytes and their interfacial compatibility with various electrodes, allowing for target‐oriented research for high performance solid‐state lithium metal batteries.

Hybrid Electrolyte of Li1.3Al0.3Ti1.7(PO4)3 Nanofibers and Cross-linked Gel Electrolyte for Li Metal Batteries

“…When using a powder-type inorganic electrolyte for HSE, there has been a practical problem of increasing the content of the inorganic electrolyte and forming an effective network structure due to the aggregation of the inorganic particles in the polymer matrix. The 3D network of the inorganic electrolyte can mitigate this problem to some extent; however, the previous HSE based on a 3D inorganic electrolyte network using electrospinning has a low inorganic electrolyte content (<30 wt %) . In this regard, the high weight content of the F-HSE (65%) resulting from the high LATP content in the fiber and the compact structure of the LATP-PAN 3D are practical and meaningful for better utilizing the interfacial conduction mechanism.…”

A review on “Growth mechanisms and optimization strategies for the interface state of solid‐state lithium‐ion batteries”

“…According to the influence of lithium dendrites on batteries, researchers are committed to effectively limiting the growth of dendrites in lithium metal anodes. 1,[149][150][151] Among them, the synthesis of artificial SEI is widely studied because of its high mechanical strength and conductivity. 110,152,153 Artificial SEI has the characteristics of inhibiting electrolyte decomposition and dendritic formation, directional electrode volume change, and promoting the uniform transmission of lithium ions on the entire electrode surface (Figure 10).…”

Facile Synthesis of Two-Dimensional Natural Vermiculite Films for High-Performance Solid-State Electrolytes

“…In addition, the VMT owns natural framework and interlayer channels. Numerous studies have proved that oriented structure and framework can facilitate the transport of Li + ions and thus achieve a higher conductivity [ 18 , 39 , 40 ]. Moreover, the VMTs have a high interlayer ion capacity [ 41 ].…”