Hybrid solid state supercapacitors (HSSC’s) for high energy & power density: an overview

Satyajeet S. Patil,1 

Tejasvinee S. Bhat,1,2 

Aviraj M. Teli,1

Sonali A. Beknalkar,1 

Sarika B. Dhavale,1 

Minaj M. Faras,1 

Milind M. Karanjkar,3 

Pramod S. Patil1,2*,Email

1Thin Film Materials Laboratory, Department of Physics, Shivaji University, Kolhapur 416 004, M.S., India.

2School of Nanoscience and Technology, Shivaji University, Kolhapur 416004, M.S., India.

3Department of Physics, Vivekanand College, Kolhapur 416003, M.S., India.

Abstract

A hybrid supercapacitor (HSC) is a supercapacitor (SC) based on two different electrode materials. One electrode is based on battery type faradic reactions (Also known as extrinsic pseudocapacitor), and the other one is based on the electric double-layer capacitor (non-faradic, known as intrinsic pseudocapacitor). In HSC, generally negative electrode material includes carbon-based materials (such as activated carbon, carbon nanotubes (CNT’s) and graphene), metal oxides (V2O5 and MoO3), and their composites, while positive electrode materials are Ni, Co-based, mixed metal oxide, binary metal-based, layered double hydroxide (LDH) based materials etc. The synergy between high conductivity, surface area of the negative electrode and architectures, heterostructures of positive electrodes used to improve the overall electrochemical performances of the HSC’s device. In this review, the basic charge storing mechanisms, a method for determination of capacitive and diffusion controlled contribution, is explained. This review highlights the importance of hybrid solid-state supercapacitors (HSSC’s) as energy storage devices. Finally, the recent advancement in the HSSC fields is discussed that will guide future work in the HSSC field.

Hybrid solid state supercapacitors (HSSC’s) for high energy & power density: an overview