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In Situ Supramolecular Self-Assembly Assisted Synthesis of Li4Ti5O12–Carbon-Reduced Graphene Oxide Microspheres for Lithium-Ion Batteries
journal contribution
posted on 2018-11-15, 00:00 authored by Fan Zhang, Fenyun Yi, Tao Meng, Aimei Gao, Dong Shu, Hongyu Chen, Honghong Cheng, Xiaoping ZhouLi4Ti5O12 (LTO)-carbon (C)-reduced
graphene oxide (rGO) microspheres are synthesized via in situ supramolecular
self-assembly, combined with spray drying and high-temperature calcination.
Dopamine can polymerize on the surface of Ti(OH)4 and form
polydopamine, through which graphene oxide(GO) connects with Ti(OH)4 uniformly and tightly to form a homogeneous supramolecular
sol system. During the high-temperature calcination, polydopamine
is carbonized to carbon to connect LTO with rGO, so that the aggregation
of rGO is inhibited, and small-sized LTO particles are obtained. The
scanning electron microscopy (SEM) image shows that in the as-prepared
LTO-C-rGO microspheres, LTO particles with diameters of ∼50
nm remained homogeneous and wrapped in a three-dimensional network
built by the rGO nanosheets. Electrochemical measurements show that
the LTO-C-rGO anode exhibits a high reversible capacity of 184 mAh
g–1 at 1 C and a high capacity retention of 94.5%
after 500 cycles at 20 C. The above excellent electrochemical performance
benefits from the unique structure of LTO-C-rGO, which enhances the
ion diffusion and facilitates electron transport.
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Keywords
form polydopaminerGO nanosheetsas-prepared LTO-C-rGO microspheresLithium-Ion Batteries Li 4 Ti 5 O 12LTO-C-rGO anode exhibitsion diffusionelectrochemical performance benefitscalcinationLTO particlesSEMSitu Supramolecular Self-Assembly Assisted Synthesissmall-sized LTO particlesscanning electron microscopy1 Csupramolecular self-assemblyoxideelectron transportcapacity retentiongraphene500 cycles20 Csupramolecular sol systemElectrochemical measurements show
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