Abstract
Materials with nanometer-sized dimensions turned out to show a number of advantages significantly improving the performance of Li-ion batteries.[1] For instance, short diffusion length of nanostructured electrode materials lead to facile Li insertion. The mesoporous morphology of the present sample investigated ensures a high lithium storage capacity. Even after massive cycling the mesoporous structure is preserved throughout illustrating the high stability of the electrode material.[2] Here, we used complementary 7Li NMR techniques to study the self-diffusion behavior of Li+ in LixTiO2 samples at different state of charges. Both 7Li spin-alignment echo NMR and rotating-frame 7Li spin-lattice relaxation NMR measurements reveal that, despite some slight structural changes during Li insertion,[2] the Li diffusion parameters do not strongly depend on composition, see also Ref. [3]. This might also contribute to the excellent cycleability observed recently.[2]
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