Mesoporous NH4NiPO4·H2O for High-Performance Flexible All-Solid-State Asymmetric Supercapacitors

Yong Liu; Xiaoliang Zhai; Keke Yang; Fei Wang; Huijie Wei; Wanhong Zhang; Fengzhang Ren; Huan Pang

doi:10.3389/fchem.2019.00118

Mesoporous NH₄NiPO₄·H₂O for High-Performance Flexible All-Solid-State Asymmetric Supercapacitors

Front Chem. 2019 Mar 7:7:118. doi: 10.3389/fchem.2019.00118. eCollection 2019.

Authors

Yong Liu^{1

2}, Xiaoliang Zhai¹, Keke Yang¹, Fei Wang¹, Huijie Wei¹, Wanhong Zhang¹, Fengzhang Ren¹, Huan Pang³

Affiliations

¹ Collaborative Innovation Center of Nonferrous Metals of Henan Province, Henan Key Laboratory of High-Temperature Structural and Functional Materials, School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang, China.
² Henan Key Laboratory of Non-Ferrous Materials Science & Processing Technology, Henan University of Science and Technology, Luoyang, China.
³ School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, China.

Abstract

Nowadays, wearable energy storage devices have been growing rapidly, but flexible systems with both excellent cycling stability and decent flexibility are still challenging. In this work, a flexible all-solid-state NH₄NiPO₄·H₂O//graphene supercapacitor with remarkable performance was successfully assembled. When cycled at a current density of 5 mA cm^-2, the device delivered 121 mF cm^-2, and showed good cycling stability after 3,000 cycles. Moreover, the all-solid-state NH₄NiPO₄·H₂O//graphene supercapacitor also exhibit high mechanical flexibility with well-maintained specific capacitance, even under bending to arbitrary angles (up to 180°) and different weights (up to 50 g).

Keywords: NH4NiPO4·H2O; all-solid-state; asymmetrical; electrochemical performances; flexible supercapacitor.