Lithium dual uptake anode materials: crystalline Fe 3 O 4 nanoparticles supported over graphite for lithium-ion batteries

BRACAMONTE, M. VICTORIA; PRIMO, EMILIANO N.; LUQUE, GUILLERMINA L.; VENOSTA, LISANDRO; BERCOFF, PAULA G.; BARRACO, DANIEL E.

ELECTROCHIMICA ACTA

PERGAMON-ELSEVIER SCIENCE LTD

Año: 2017 vol. 258 p. 192 - 199

0013-4686

Graphite, the usual anode material for currenttechnology of lithium ion batteries (LIB), has great advantages and itsprocessing is widely known and industrially feasible. For improving the anode?scapacity, recent research has focused in using nano-carbons as an overcomingstrategy rather than including cheap, conversion-type oxide metals. Here, wepresent the application of in-situ synthesized hybrid LIB active anode materialscomposed of magnetite nanoparticles (Fe3O4 NPs) andgraphite of different sizes. The results show that the graphite´s flake sizeplays an important role in the Fe3O4 NPs deposition andloading, and therefore in the morphology of the resulting laminate film. Theelectrochemical performance (evaluated by cyclic voltammetry, galvanostaticcharge/discharge cycles and impedance spectroscopy) is determined not only by theedge density of graphite flakes and Fe3O4 loading butalso by the porosity of the anode films. The hybrid material electrode withsmallest graphite particle size shows the highest reversible capacity of 845mAhg-1, good rate capability and great cycling performance. This remarkableimprovement in graphite?s capacity is reached by only adding 16 wt% ofmagnetite to the carbon material.