Improving conductivity of electron and ion was considered to be the significant tendency on pseudocapacitive materials. In this work, a flower-like P-NiAl LDHs electrode materials have been successfully fabricated by hydrothermal synthesis and subsequent phosphatized treatment. Owing to the presence of phosphide, the resulting P-NiAl LDHs electrode showed a high specific capacitance of 2159F g(-1) at 1 A g(-1 )and a good capacitance retention of 85.6% at 20 A g(-1), which more excellent than NiAl LDHs electrode. Besides, the P-NiAl LDHs//AC asymmetric supercapacitor exhibited a high energy density of 79.3 Wh kg (1) under a power density of 1033.6 W kg(-1) and an acceptable stability of 73.6% specific capacitance retention after 2400 charge-discharge cycles. Consequently, the P-NiAl LDHs nanoflower is one of the better candidates for assembling supercapacitor, and this phosphatized method is a kind of facile and desirable strategies to improve the electrochemical characteristics of LDH-based supercapacitor materials. (C) 2020 Elsevier Inc. All rights reserved.