Matching CP@NCOH/NF Cathode and GH/FNP/NF Anode for High‐Performance Asymmetric Supercapacitor
Haoyan Meng, Shilong Wang, Xueying Ma, Dehao Zhang, Linlin Zhang, Xuying Liu, Li Zhang
Abstract
Abstract It is extremely crucial to design and match high‐quality cathode and anode for achieving high‐performance asymmetric supercapacitors (ASCs). Herein, Co 3 (PO 4 ) 2 @NiCo‐LDH/Ni foam (CP@NCOH/NF) cathode with hierarchical morphology and graphene hydrogel/Fe–Ni phosphide/Ni foam (GH/FNP/NF) anode with the robust and porous structure are elaborately designed and prepared, respectively. Owing to their unique and profitable structures, both CP@NCOH/NF and GH/FNP/NF electrodes yield the superior capacity (10760 and 2236 mC cm −2 at 2 mA cm −2 , respectively), good rate capability (63% retention at 200 mA cm −2 and 52% retention at 50 mA cm −2 , respectively), and excellent cycling stability (72% and 74% retention after 10 000 cycles, respectively). Benefiting from their matchable electrochemical performances, the configured solid‐state CP@NCOH/NF//GH/FNP/NF ASC outputs both competitive energy density (80.2 Wh kg −1 /4.1 mWh cm −3 ) and power density (14563 W kg −1 /750 mW cm −3 ), companied by remarkable cyclability (71% retention after 10 000 cycles), manifesting its great promise for large‐scale integrated energy‐storage system.