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- W2188803437 abstract "Abstract To explore anode materials with large capacities and high rate performances for the lithium-ion batteries of electric vehicles, defective Ti 2 Nb 10 O 27.1 has been prepared through a facile solid-state reaction in argon. X-ray diffractions combined with Rietveld refinements indicate that Ti 2 Nb 10 O 27.1 has the same crystal structure with stoichiometric Ti 2 Nb 10 O 29 (Wadsley-Roth shear structure with A2/m space group) but larger lattice parameters and 6.6% O 2– vacancies ( vs. all O 2– ions). The electronic conductivity and Li + ion diffusion coefficient of Ti 2 Nb 10 O 27.1 are at least six orders of magnitude and ~2.5 times larger than those of Ti 2 Nb 10 O 29 , respectively. First-principles calculations reveal that the significantly enhanced electronic conductivity is attributed to the formation of impurity bands in Ti 2 Nb 10 O 29– x and its conductor characteristic. As a result of the improvements in the electronic and ionic conductivities, Ti 2 Nb 10 O 27.1 exhibits not only a large initial discharge capacity of 329 mAh g –1 and charge capacity of 286 mAh g –1 at 0.1 C but also an outstanding rate performance and cyclability. At 5 C, its charge capacity remains 180 mAh g –1 with large capacity retention of 91.0% after 100 cycles, whereas those of Ti 2 Nb 10 O 29 are only 90 mAh g –1 and 74.7%." @default.
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- W2188803437 date "2015-12-03" @default.
- W2188803437 modified "2023-10-16" @default.
- W2188803437 title "Defective Ti2Nb10O27.1: an advanced anode material for lithium-ion batteries" @default.
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- W2188803437 doi "https://doi.org/10.1038/srep17836" @default.
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