Figure 4

Galvanostatic charge-discharge curves of Li-HEC comprising spinel phase Li₄Ti₅O₁₂ anode and coconut shell derived carbons as cathode (a) ZP (b) HTP and (c) ZHTP and (d) Ragone plot of Li-HEC along with CAC cathode and activated graphene (AG) based Li-HEC by Stoller et al.²⁹, trigol reduced graphene oxide (TRGO) based Li-HEC by Aravindan et al.³⁹.