Preparation and Electrochemical Performance of Iron Oxide-Based Lithium Ion Battery Anode
Using graphene and carbon nanotube composite(G/CNT)as the carrier and FeCl3 as the iron source,Fe2O3 with tubular morphology and graphene/carbon nanotube composite(Fe2O3-G/CNT)was prepared by in-situ reaction under the condition of NH4H2PO4 salt bath.Fe2O3-G/CNT composites were used as anode materials for lithium-ion batteries,and the effects of different ratios of iron source and G/CNT in the composites on the electrochemical and cell performance of the electrode materials were explored in comparison.The results showed that the generated Fe2O3 maintained tubular morphology in carbon materials with different ratios,and the carbon material carrier improved the dispersion of Fe2O3,alleviated the capacity decay of the electrode material,and significantly improved the specific capacity of the electrode material.Among them,the Fe2O3-G/CNT(10%)composite electrode exhibited a specific capacity of 1 316 mA·h·g-1 in the first cycle at a current density of 100 mA·g-1,and maintained a capacity of 796.3 mAh·g-1 after 100 cycles,with a retention rate of 82.9%.Under the rate conditions of 100,200,500,800,and 1000 mA·g-1,the discharge specific capacities of the electrode material were 891.7,742.6,599.6,505.6,451.6 mA·h·g-1,respectively.The alternating-current impedance study showed that the addition of carbon material reduced the impedance of the material,which was beneficial to the improvement and enhancement of the electrode material performance.
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