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Flexible Free-Standing Fe2O3 Nanoparticle/Carbon Shells/Graphene Films for Advanced Lithium-Ion Batteries
journal contribution
posted on 2022-03-29, 17:04 authored by Dafang He, Mufan Sun, Da Cao, Yujie Ding, Haiqun Chen, Guangyu HeHigh-capacity anode materials of
transition-metal oxides (TMOs)
usually undergo low conductivities and drastic volume variation derived
from a multielectron-transfer conversion reaction mechanism, which
seriously hinder the cycling stability and rate performance toward
their commercialization. Herein, a free-standing Fe2O3/C shells/reduced graphene oxide (Fe2O3/C/RGO) film as an additive-free anode is fabricated by a facile
two-step strategy accompanied by the physical cross-linking feature
of chitosan. In this free-standing structure, the Fe2O3 nanoparticles (NPs) with diameters of 20–30 nm are
encapsulated by chitosan pyrolytic C shells and further confined within
a highly ordered RGO film. As a consequence, the ultrasmall Fe2O3 NPs can effectively reduce the Li+ diffusion pathway, while the C shell and RGO sheets act as a matrix
to alleviate the huge volumetric change of Fe2O3 NPs during the charge/discharge process. Benefiting from the advantages
of a free-standing film, the well-designed Fe2O3/C/RGO film effectively resolves long-standing challenges and achieves
an admirable capacity of 609 mAh·g–1 at 1 A·g–1, a good rate performance (up to 4 A·g–1), and an outstanding cycling performance over 1000 cycles. These
results provide a universal strategy to integrate TMOs with RGO to
construct a flexible self-supported film for superior lithium-ion
batteries.
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sup >+ suprate performance towardhuge volumetric changegood rate performancestep strategy accompaniedreduced graphene oxideoutstanding cycling performance3 sub2 subrgo sheets action batteries highcapacity anode materialsion batteriesuniversal strategygraphene filmscycling stabilityadmirable capacityfree anode· gsuperior lithiumstanding structurestanding challengesseriously hinderresults providephysical crossmetal oxideslinking featureflexible selffacile twoeffectively reducedischarge processdiffusion pathwayconfined withincarbon shellsc shelladvanced lithium1000 cycles