The paper presents a novel bipolar cathode material, PTO-2CZ, for lithium-ion batteries, which is synthesized through in situ electropolymerization. PTO-2CZ consists of *n*-type pyrene-4,5,9,10-tetraone (PTO) and *p*-type carbazole (CZ) units, enabling multiple redox reactions and enhancing electrochemical performance. The material exhibits excellent electrochemical properties, including a high discharge capacity of 202 mA h g⁻¹ at 200 mA g⁻¹, impressive working potential (2.87 and 4.15 V), outstanding rate capability of 119 mA h g⁻¹ at 10 A g⁻¹, and a notable energy density of 554 Wh kg⁻¹. The D–A structure of PTO-2CZ extends π–π conjugation and promotes charge transfer, leading to enhanced rate performance. The material also demonstrates good cycling stability, with a capacity retention of 72.7% at 5 A g⁻¹ after 2000 cycles. The study highlights the potential of PTO-2CZ as a high-performance cathode material for lithium-ion batteries, offering a promising approach to mitigate dissolution issues and improve energy density.The paper presents a novel bipolar cathode material, PTO-2CZ, for lithium-ion batteries, which is synthesized through in situ electropolymerization. PTO-2CZ consists of *n*-type pyrene-4,5,9,10-tetraone (PTO) and *p*-type carbazole (CZ) units, enabling multiple redox reactions and enhancing electrochemical performance. The material exhibits excellent electrochemical properties, including a high discharge capacity of 202 mA h g⁻¹ at 200 mA g⁻¹, impressive working potential (2.87 and 4.15 V), outstanding rate capability of 119 mA h g⁻¹ at 10 A g⁻¹, and a notable energy density of 554 Wh kg⁻¹. The D–A structure of PTO-2CZ extends π–π conjugation and promotes charge transfer, leading to enhanced rate performance. The material also demonstrates good cycling stability, with a capacity retention of 72.7% at 5 A g⁻¹ after 2000 cycles. The study highlights the potential of PTO-2CZ as a high-performance cathode material for lithium-ion batteries, offering a promising approach to mitigate dissolution issues and improve energy density.