Kinetic pathways of ionic transport in fast-charging lithium titanate
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- Kinetic pathways of ionic transport in fast-charging lithium titanate
- Zhang, Wei; Seo, Dong-Hwa; Chen, Tina; Wu, Lijun; Topsakal, Mehmet; Zhu, Yimei; Lu, Deyu; Ceder, Gerbrand; Wang, Feng
- Issue Date
- AMER ASSOC ADVANCEMENT SCIENCE
- SCIENCE, v.367, no.6481, pp.1030 - 1034
- Fast-charging batteries typically use electrodes capable of accommodating lithium continuously by means of solid-solution transformation because they have few kinetic barriers apart from ionic diffusion. One exception is lithium titanate (Li4Ti5O12), an anode exhibiting extraordinary rate capability apparently inconsistent with its two-phase reaction and slow Li diffusion in both phases. Through real-time tracking of Li+ migration using operando electron energy-loss spectroscopy, we reveal that facile transport in Li4+xTi5O12 is enabled by kinetic pathways comprising distorted Li polyhedra in metastable intermediates along two-phase boundaries. Our work demonstrates that high-rate capability may be enabled by accessing the energy landscape above the ground state, which may have fundamentally different kinetic mechanisms from the ground-state macroscopic phases. This insight should present new opportunities in searching for high-rate electrode materials.
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