Flexible Free-Standing Fe2O3 Nanoparticle/Carbon Shells/Graphene Films for Advanced Lithium-Ion Batteries
journal contributionposted on 2022-03-29, 17:04 authored by Dafang He, Mufan Sun, Da Cao, Yujie Ding, Haiqun Chen, Guangyu He
High-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.
Read the peer-reviewed publication
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