Abstract:The over capacity of lithium ion batteries with metal-oxides anode materials is usually regarded as originating from the low-voltage decomposition of the electrolyte and subsequent formation of a gellike polymer layer deposited on the metal-oxides surfaces. In this work, we report a high over capacity value of 1800 mA h g(-1) after 350(th) charge-discharge cycles for Fe2O3-made lithium ion batteries. It is found that the capacitive nature of the designed Fe2O3@ C18H34O2 nanostructure not only contributes to the large observed excess in capacity, but also results in unique rate capabilities. Thus, a capacitive model is proposed to outline a plausible mechanism to explain these electrochemical findings, and it is anticipated that this paper will shed some new light on future design of the next generation of lithium ion batteries.

Volume:4

Issue:18

Translation or Not:no