Petals morphology formation and pseudocapacitive properties of LiGa5O8 ceramics
Aditya Sharma, Manas Nasit, Nitin Kumar Gautam, Shalendra Kumar, Ranjeet Brajpuriya, Byeong Ha Lee, Sung Ok Won, Mayora Varshney, Nishima Chaddha, H.J. Shin
Abstract
The LiGa 5 O 8 samples have been prepared using the solid-state reaction method (annealed at 800 ⁰C and 1300 ⁰C) and investigated for electrochemical properties. X-ray diffraction (XRD) results confirmed the spinel structure stability up to 1300 ⁰C. Scanning electron microscopy (SEM) results convey petals-like morphology formation in the LiGa 5 O 8 compounds. The 800 ⁰C annealed sample consists of two different pores of 41.5 Å and 72.3 Å with a larger specific surface area of 0.982 m 2 /g. The 1300 ⁰C annealed sample obeys a specific surface area of 0.433 m 2 /g and a single pore of the size of 48.5 Å. The redox feature-rich CV curves and the pseudo-capacitance charging/discharging characteristics from GCD results have offered a specific capacitance of ∼107.6 F/g (at a scan rate of 5 mV/s) and 141.8 F/g (at a current density of 1 A/g), respectively, for LiGa 5 O 8 -800 sample. The LiGa 5 O 8 −1300 sample could exhibit lesser specific capacitance of 84.4 F/g (at 5 mV/s scan rate) and 97.2 F/g (at a current density of 1 A/g) due to the inferior adsorption/desorption and lithiation/delithiation reactions at the petals of subordinate surface area and pores. LiGa 5 O 8 -800 and LiGa 5 O 8 -1300 samples have exhibited 77 % and 70 % retention up to 3000 cycles. Our results pave the way to explore new, cost-effective, and stable oxide systems for energy storage devices. • Petals-like morphology formation in the LiGa 5 O 8 . • High specific capacitance of 141.8 F/g at a current density of 1 A/g. • Decrease in the specific capacitance with higher annealing temperature.