Coarse-grained reduced Mo Ti1−Nb2O7+ anodes for high-rate lithium-ion batteries
Author(s)
Zhao, Lijiang
Wang, Shitong
Dong, Yanhao
Quan, Wei
Han, Fei
Huang, Yimeng
Li, Yutong
Liu, Xinghua
Li, Mingda
Zhang, Zhongtai
Date Issued
October 2020
Journal
Energy Storage Materials
Publisher
Elsevier BV
Citation
Zhao, Lijiang et al. "Coarse-grained reduced MoxTi1−xNb2O7+y anodes for high-rate lithium-ion batteries." Energy Storage Materials 34 (January 2021): 574-581. © 2020 Elsevier B.V.
Version
Author's final manuscript
Abstract
High-volumetric-energy-density lithium-ion batteries require anode material with a suitable redox potential, a small surface area, and facile kinetics at both single-particle and electrode level. Here a family of coarse-grained molybdenum substituted titanium niobium oxides Mo[subscript x]Ti[subscript 1−x]Nb[subscript 2]O[subscript 7+y] (single crystals with 1~2 μm size) underwent hydrogen reduction treatment to improve electronic conduction was synthesized, which is able to stably deliver a capacity of 158.5 mAh g[superscript −1] at 6,000 mA g[superscript −1] (65.2 % retention with respect to its capacity at 100 mA g[superscript −1] ) and 175 mAh g[superscript −1] (73 % capacity retention over 500 cycles) at 2,000 mA g[superscript −1], respectively. Via careful in situ electrochemical characterizations, we identified the kinetic bottleneck that limits their high-rate applications to be mainly ohmic loss at the electrode level (which mostly concerns electron transport in the composite electrodes) rather than non-ohmic loss (which mostly concerns Li+ lattice diffusion within individual particles). Such a kinetic problem was efficiently relieved by simple treatments of Mo substitution and gas-phase reduction, which enable full cells with high electrode density, and high volumetric energy/power densities. Our work highlights the importance of diagnosis, so that modifications could be made specifically to improve full-cell performance.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1016/J.ENSM.2020.10.016
