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Author Pan, Mengjie ♦ Zhang, Lin ♦ Gong, Lijun ♦ Liu, Hongbo ♦ Chen, Yuxi
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword NANOSCIENCE AND NANOTECHNOLOGY ♦ ANODES ♦ CAPACITY ♦ CARBON ♦ CURRENT DENSITY ♦ EFFICIENCY ♦ ELECTRIC BATTERIES ♦ ELECTROCHEMISTRY ♦ ELECTRON MICROSCOPY ♦ LAYERS ♦ LITHIUM IONS ♦ LITHIUM OXIDES ♦ LITHIUM TITANATES ♦ NANOPARTICLES ♦ NANOSTRUCTURES ♦ STABILITY ♦ SYNTHESIS ♦ THERMODYNAMIC ACTIVITY ♦ THICKNESS ♦ TITANIUM OXIDES
Abstract Highlights: • Lithiated Li{sub 4+x}Ti{sub 5}O{sub 12}/C with pre-stored active Li ions has been synthesized. • The first-cycle coulombic efficiency of Li{sub 4+x}Ti{sub 5}O{sub 12}/C is over 100%. • Li{sub 4+x}Ti{sub 5}O{sub 12}/C displays excellent cyclic stability and capacity retention. • TiO{sub 2} nanoparticles and carbon coating are necessary for formation of Li{sub 4+x}Ti{sub 5}O{sub 12}/C. - Abstract: Carbon-coated Li{sub 4}Ti{sub 5}O{sub 12} and lithiated Li{sub 4+x}Ti{sub 5}O{sub 12} anode materials have been synthesized using nanosized anatase TiO{sub 2} and commercial TiO{sub 2} with mixed structure as Ti sources, respectively. Microstructural investigation indicates that Li{sub 4}Ti{sub 5}O{sub 12} and Li{sub 4+x}Ti{sub 5}O{sub 12} are covered by amorphous carbon layers with thickness of 2–3 nm. Their electrochemical performance has been evaluated, which indicates that an amount of active Li ions have been pre-stored in the Li{sub 4+x}Ti{sub 5}O{sub 12} lattice during solid-state synthesis, resulting in its first-cycle coulombic efficiency over 100%. Further, Li{sub 4+x}Ti{sub 5}O{sub 12}/C exhibits higher cyclic capacities than Li{sub 4}Ti{sub 5}O{sub 12}/C at different current density. The reversible charge capacity retention of Li{sub 4+x}Ti{sub 5}O{sub 12}/C reaches 98.5% after 100 cycles, which indicates that Li{sub 4+x}Ti{sub 5}O{sub 12}/C is promising candidate anode material for long lifetime lithium-ion batteries. The formation mechanism of Li{sub 4+x}Ti{sub 5}O{sub 12}/C has been discussed, in which the nanosized anatase TiO{sub 2} with high chemical activity and the carbon coating play key roles for the formation of Li{sub 4+x}Ti{sub 5}O{sub 12}/C.
ISSN 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-11-15
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 71


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