Hierarchical micro-nano structure based NiCoAl-LDH nanosheets reinforced by NiCo2S4 on carbon cloth for asymmetric supercapacitor

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 905; p. 115982
• Main Authors: Li, Yanli, Yan, Xuehua, Zhang, Wenjing, Zhou, Wending, Zhu, Yihan, Zhang, Mengyang, Zhu, Wen, Cheng, Xiaonong
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.01.2022; Elsevier Science Ltd
• Subjects: Activated carbon; All-solid-state supercapacitor; Asymmetry; Carbon; Carbon cloth; Coated electrodes; Electrochemical analysis; Electrode materials; Electrodes; Flexible electrode; Hybrid structures; Hydrothermal reactions; Hydroxides; Layered double hydroxide; Nanosheets; NiCo2S4; Structural hierarchy; Supercapacitors; All-solid-state supercapacitor; Flexible electrode; NiCo2S4; Carbon cloth; Layered double hydroxide
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2021.115982

All-solid-state asymmetric supercapacitor based on hierarchical hybrid structure decorated with conductive NiCo2S4 on NiCoAl-LDH has good energy density and power density. [Display omitted] •NCA-LDH@NCS@CC is synthesized by a simple and low-cost hydrothermal method.•Hierarchical hybrid structure NCA-LDH@NCS is formed on carbon cloth.•NiCo2S4 boosts overall electrical conductivity and hinders agglomeration of LDH.•NCA-LDH@NCS@CC//AC@CC is assembled with high energy density and cycle stability. Rational construction of microstructure and successful incorporation of multiple components offer a scalable strategy for applying electrode materials in asymmetric supercapacitors. Herein, a hierarchical hybrid structure of NiCoAl-layered double hydroxide (NCA-LDH) and ternary spinel NiCo2S4 (NCS) on carbon cloth (CC) without binders is obtained through three-step hydrothermal reaction. The NCA-LDH@NCS@CC electrode exhibits outstanding electrochemical performance with 1775F g−1 at 1 A g−1. Its capacitance retention is 79.6% when cycles reach 10 000 under 10 A g−1, benefiting from the hierarchical hybrid structure and improved overall conductivity. A flexible solid-state asymmetric supercapacitor (FSASC) is assembled using NCA-LDH@NCS@CC and activated carbon coated on carbon cloth (AC@CC) for positive and negative electrodes, respectively. It possesses 33.13 Wh kg−1 under 750 W kg−1, and also maintains a better cycling performance of 71.4% at 1 A g−1 after 10 000 cycles. Hierarchical hybrid NCA-LDH@NCS@CC electrode provides a favorable and scalable candidate for the development of FSASC device with superior performance.