Polymeric electrode materials (PEMs) are the most attractive organic materials in metal-ions batteries (MIBs), endowing molecular diversity, structure flexibility, renewable organic abundance, and eco-friendliness. However, PEMs still suffer from significant issues, including poor electronic conductivity, huge volume variation, and, most importantly, the dissolution of the organic electrolytes. This chapter systematically summarizes and discusses the chemical properties, redox reaction mechanisms, reasonable modification strategies, and the recent application of different MIBs. Regarding the specific energy density, power density, and cycling performance, molecular and morphological engineering was refined and presented to enhance the electrochemical performance of the PEMs in rechargeable battery systems. Hopefully, this chapter can help build a common sense of PEMs for readers to understand and develop their application quickly in advanced MIBs.