Li ion dynamics in TiO2 anode materials with an ordered hierarchical pore structure--insights from ex situ NMR

Physical Chemistry Chemical Physics : PCCP
Patrick BottkeM Wilkening

Abstract

Ex situ Nuclear Magnetic Resonance (NMR) measurements were carried out to study lithium ion dynamics in lithium intercalated mesoporous anatase (LixTiO2) serving as an anode material for rechargeable lithium-ion batteries. As has been shown recently, hierarchically ordered TiO2 shows excellent cycling performance and ensures a high lithium storage capacity. (7)Li spin-lattice relaxation NMR and stimulated echo NMR serve as a powerful combination to shed light on the Li hopping processes from an atomic-scale point of view. To determine atomic Li jump rates and microscopic activation energies temperature-variable SLR NMR measurements, in both the laboratory and rotating frame of reference, as well as mixing-time dependent spin-alignment echo NMR measurements were carried out. The results point to moderate Li diffusivities; however, in a lithium-ion cell this is compensated for by taking advantage of nm-structured materials with greatly reduced diffusion lengths. Importantly, although a phase transition from tetragonal symmetry to orthorhombic symmetry takes place at increased states of charge, the diffusion parameters and activation energies probed (0.4 to 0.5 eV) do depend weaker on Li content x than expected. Thus, despite the ...Continue Reading

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Citations

Mar 19, 2016·Scientific Reports·Jun Kue ParkCheol Eui Lee
Jun 7, 2016·Journal of the American Chemical Society·Kent J GriffithClare P Grey
Jun 7, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Isabel HanghoferH Martin R Wilkening
Jan 29, 2021·Physical Chemistry Chemical Physics : PCCP·Andrés RudermanFabián Vaca Chávez

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