High-Performance Organic Electrode Materials

Abstract

Organic electrode materials (OEMs) are one of next-generation of electrode materials, allowing the wide range of application in metal ions batteries (MIBs) like lithium-ions batteries, sodium-ions batteries, zinc ions batteries, aluminium-ions batteries, and so on. OEMs are attractive because of their molecular adjustability, flexible nature, green resources, and low-environmental footprint. However, the nature of electronic insulation and solubility in organic electrolytes degrade the battery performance of OEMs. In order to address these challenges, we have concluded and applied useful strategies (i.e., molecular and morphological engineering) to achieve fast ionic/electronic conductivity and stability in the cycling process. Molecular engineering includes mitigating the number and kinds of redox-active centres to enhance the specific capacity, grafting electron-withdrawing/donating groups to adjust the working voltage, increasing the degree of polymerization to decrease the solubility, extending the conjugated structure to enhance the electronic conductivity, and so on. Morphological engineering is regarding to conceive 0D, 1D, 2D, and 3D OEMs for optimizing the ionic and electronic conducting pathway. In a word, through molecular and morphological engineering, OEMs could be promising electrode materials for high performance MIBs. Figure caption: The chemical molecular structure, morphology, and the types of OEM-based batteries with the illustration of molecular and morphological engineering strategies. Figure 1