Cation‑Disordered Rock‑Salt Lithium Titanium Oxyfluoride Anode Enabling High‑Rate Li‑Ion Storage Through a 3D Percolation Network (IMAGE)

Shanghai Jiao Tong University Journal Center

Cation‑Disordered Rock‑Salt Lithium Titanium Oxyfluoride Anode Enabling High‑Rate Li‑Ion Storage Through a 3D Percolation Network

Caption

  • A novel low-potential cation-disordered rock-salt lithium titanium oxyfluoride (DRX-LixTiOF2) anode synthesized via electrochemically induced transformation enables pseudocapacitive Li+ storage extending down to 0.1 V vs. Li+/Li and delivers a high reversible capacity of ~ 310 mAh g-1 and an ultrahigh rate capability exceeding 64.4 C.
  • Monte Carlo simulations reveal that the pseudocapacitive characteristics of DRX-LixTiOF2 anode originate from a three-dimensional percolation network that facilitates fast Li+ migration with low energy barriers, enabled by a cation/anion-disordered structure arising from the mixed occupancy of Li/Ti cations and O/F anions.
  • The lithium-ion capacitor assembled with this DRX-LixTiOF2 anode and an activated carbon cathode exhibits exceptional performance: a 4.0 V operating voltage, a high energy density of 197.9 Wh kg-1 and an ultrahigh power density of 50,000 W kg-1.

Credit

Jing Gao, Minghao Hua, Junze Lu, Yuying Qin, Shuxian Zhang, Qingyu Li, Lidong Yang, Chengxiang Wang, Xiaohang Lin*, Yuanwei Sun*, Longwei Yin*, Rutao Wang*.

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License

CC BY-NC-ND

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