Diamond-shaped Fe2O3@C18H34O2 Core–shell Nanostructures As ...

Diamond-shaped Fe2O3@C18H34O2 core–shell nanostructures as anodes for lithium ion batteries with high over capacity

Ji Ma,a Xiaodan Zhang,a Kezheng Chen*a and Xiaodong Hanb Author affiliations

* Corresponding authors

a College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China E-mail: kchen@qust.edu.cn Tel: +86 532 84022509

b Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100022, China Tel: +86 10 67392281

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 gel-like 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 350th 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.

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