A graphene-like hollow sphere anode for lithium-ion batteries

Abstract

In this work, we report an innovative flash Joule heating method for the preparation of graphene-like materials. The L-GHS exhibited a uniform diameter of 200 nm and the specific capacity remained at 942 mA h g−1 after 600 cycles.

Self-sacrifice template construction of a conductive Cu3(HHTP)2 nanowhisker arrays@copper foam toward robust lithium storage

“…The peak current ( i ) increases with scanning rate ( v ), while the shape of the CV curves remains consistent with only slight deviations, indicating good reversibility and superb reaction kinetics. 5,28 The relationship between i and v can be determined with the following equation: 28 i = av b where the value of b reflects the charge storage kinetics. When the value of b is close to 0.5, the electrochemical reaction is controlled by ion diffusion, and if the value of b approaches 1.0, it specifies surface-controlled behaviour.…”

“…When the value of b is close to 0.5, the electrochemical reaction is controlled by ion diffusion, and if the value of b approaches 1.0, it specifies surface-controlled behaviour. 28 Fig. 4b profiles the linear relationship by plotting log( i ) and log( v ) for anodic and cathodic processes.…”

“…This shows that the charge/discharge processes are controlled by both ion diffusion and pseudocapacitive behaviour. The capacitive contributions are calculated with the following equation: 28 i = k 1 v + k 2 v 1/2 where k 1 v and k 2 v 1/2 correspond to the capacitance and diffusion contribution, respectively. As depicted in Fig.…”