Electrochemical performance of amorphous carbon coated α-Fe2O3/expanded natural graphite composites as anode active materials for lithium ion batteries
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An amorphous carbon-coated α-Fe2O3/expanded natural graphite (ENG) composite as an anode active material for lithiumionbatteries was successfully synthesized by a simple hydrothermal method. The ENG anode material used as a matrixshowed better cycling performance but a larger irreversible capacity than pristine NG anode material due to the large amountof solid electrolyte interface film. The reversible capacity of the ENG anode material increased by approximately 26% throughimpregnation of α-Fe2O3 nanoparticles. Nevertheless, the capacity retention significantly decreased from 98.9 to 74.9% after63 cycles due to volume expansion and microstructural change caused by aggregation of Fe and Li2O during the chargedischargeprocess. This degradation of cycling performance was overcome by the surface coating of amorphous carbons. Thereversible capacity of an amorphous carbon-coated α-Fe2O3/ENG composite increased with cycling and reached 576 mAh/gat the 95th cycle and 524 mAh/g at the 350th cycle, showing 99% capacity retention. The favorable cycling performance wasattributed to suppression of nanoparticle aggregation, a fast charge transfer, and lowering of the contact resistance by theconductive amorphous carbon coating.
Abstract
An amorphous carbon-coated α-Fe2O3/expanded natural graphite (ENG) composite as an anode active material for lithiumionbatteries was successfully synthesized by a simple hydrothermal method. The ENG anode material used as a matrixshowed better cycling performance but a larger irreversible capacity than pristine NG anode material due to the large amountof solid electrolyte interface film. The reversible capacity of the ENG anode material increased by approximately 26% throughimpregnation of α-Fe2O3 nanoparticles. Nevertheless, the capacity retention significantly decreased from 98.9 to 74.9% after63 cycles due to volume expansion and microstructural change caused by aggregation of Fe and Li2O during the chargedischargeprocess. This degradation of cycling performance was overcome by the surface coating of amorphous carbons. Thereversible capacity of an amorphous carbon-coated α-Fe2O3/ENG composite increased with cycling and reached 576 mAh/gat the 95th cycle and 524 mAh/g at the 350th cycle, showing 99% capacity retention. The favorable cycling performance wasattributed to suppression of nanoparticle aggregation, a fast charge transfer, and lowering of the contact resistance by theconductive amorphous carbon coating.
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