A novel donor-acceptor (D-A) bipolar polymer, PTO-2CZ, was synthesized and used as a cathode for lithium-ion batteries through in situ electropolymerization. This polymer combines n-type pyrene-4,5,9,10-tetraone (PTO) units for lithium ion storage and p-type carbazole units for anion storage, enabling dual-ion storage. The D-A structure enhances redox reactions and kinetics, leading to excellent electrochemical performance. The cathode exhibits a high discharge capacity of 202 mA h g⁻¹ at 200 mA g⁻¹, a working voltage of 2.87 and 4.15 V, a rate capability of 119 mA h g⁻¹ at 10 A g⁻¹, and an energy density of 554 Wh kg⁻¹. The polymer's in situ electropolymerization reduces inactive segments and improves cycling stability, with over 72.7% capacity retention after 2000 cycles at 5 A g⁻¹. The material's bipolar nature allows for efficient anion and cation storage, contributing to its high performance. Ex situ analysis using XPS and FTIR confirmed the dual-ion storage mechanism, with anion interaction with N atoms and cation interaction with carbonyl groups. Theoretical calculations supported the material's ability to store multiple ions and its high conjugation degree. This study demonstrates the potential of D-A bipolar polymers for high-energy, high-stability lithium-ion batteries.A novel donor-acceptor (D-A) bipolar polymer, PTO-2CZ, was synthesized and used as a cathode for lithium-ion batteries through in situ electropolymerization. This polymer combines n-type pyrene-4,5,9,10-tetraone (PTO) units for lithium ion storage and p-type carbazole units for anion storage, enabling dual-ion storage. The D-A structure enhances redox reactions and kinetics, leading to excellent electrochemical performance. The cathode exhibits a high discharge capacity of 202 mA h g⁻¹ at 200 mA g⁻¹, a working voltage of 2.87 and 4.15 V, a rate capability of 119 mA h g⁻¹ at 10 A g⁻¹, and an energy density of 554 Wh kg⁻¹. The polymer's in situ electropolymerization reduces inactive segments and improves cycling stability, with over 72.7% capacity retention after 2000 cycles at 5 A g⁻¹. The material's bipolar nature allows for efficient anion and cation storage, contributing to its high performance. Ex situ analysis using XPS and FTIR confirmed the dual-ion storage mechanism, with anion interaction with N atoms and cation interaction with carbonyl groups. Theoretical calculations supported the material's ability to store multiple ions and its high conjugation degree. This study demonstrates the potential of D-A bipolar polymers for high-energy, high-stability lithium-ion batteries.