Abstract
Fe2O3 nanorods exposing (001) and (010) plane as well as Fe2O3 nanosheets exposing (001) plane have been successfully synthesized. Fe2O3 nanosheets exhibit better cycle performance and rate capabilities than that of Fe2O3 nanorods. The discharge capacity of Fe2O3 nanosheets can stabilize at 865 mAh/g at the rate of 0.2 C (1C = 1000 mA/g) and 570 mAh/g at the rate of 1.2 C after 80 cycles, which increased by 90% and 79% compared with 456 mAh/g and 318 mAh/g of Fe2O3 nanorods. In comparison with (010) plane, the (001) plane of hematite possesses larger packing density of Fe3+ and O2−, which is responsible for the superior electrochemical performances of Fe2O3 nanosheets than that of Fe2O3 nanorods. In addition, potentiostatic intermittent titration (PITT) results show the diffusion coefficients of Li+ (DLi) of Fe2O3 nanosheets is higher than that of Fe2O3 nanorods. The higher diffusion coefficients of Li+ is favorable for the excellent lithium-storage capabilities and rate capability of Fe2O3 nanosheets. Inspired by our results, we can design and synthesize Fe2O3 or other electrodes with high performances according to their structure features in future.
Highlights
3d transition-metal oxides, which can be used as anode materials, such as iron oxide, cobalt oxide, and nickel oxide have attracted a great deal of attentions for their much higher capacity than that of conventional graphite (372 mAhg−1)[1,2,3,4,5,6,7,8,9,10,11,12]
Controlling the exposed crystal plane of Fe2O3 might be an effective strategy to further improve the electrochemical performance of Fe2O3 as anode materials for lithium-ion batteries
The discharge capacity of Fe2O3 nanosheets could stabilize at 865 mAhg−1 at the rate of 0.2C (1 C = 1000 mAg−1) and 570 mAhg−1 at the rate of 1.2 C over 80 cycles, which increased by 90% and 79% compared with 456 mAhg−1 and 318 mAhg−1 of Fe2O3 nanorodes
Summary
Fe2O3 on the Electrochemical Performance for Lithium-ion received: 11 April 2016 accepted: 17 June 2016 Published: 06 July 2016. Wei et al found that the electrochemical performance of lithium rich material Li(Li0.17Ni0.25 Mn0.58)O2 with (010) and (100) planes have been greatly increased, exhibiting a high reversible capacity and an excellent cycle stability[27]. Controlling the exposed crystal plane of Fe2O3 might be an effective strategy to further improve the electrochemical performance of Fe2O3 as anode materials for lithium-ion batteries. When used as anode materials in lithium-ion batteries, Fe2O3 nanosheets exhibit better cycle performance and rate capabilities than that of Fe2O3 nanorods. Our results indicate the superior electrochemical performances of Fe2O3 nanosheets can be attributed to (1) the larger packing density of Fe3+ and O2− of (010) plane and (2) the higher diffusion coefficient of Li+ (DLi) of Fe2O3 nanosheets during discharge-charge process. Our results provide a idea which we can design and synthesize electrode materials with high performances according to their structure features in future
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