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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Cation-Disordered Rock-Salt Lithium Titanium Oxyfluoride Anode Enabling High-Rate Li-Ion Storage Through a 3D

Jing Gao1, Minghao Hua2, Junze Lu1

  • 1Shandong Provincial Key Laboratory of Electrochemical Catalysis and Conversion, School of Materials Science and Engineering, Shandong University, Ji'nan, 250061, People's Republic of China.

Nano-Micro Letters
|March 10, 2026
PubMed
Summary
This summary is machine-generated.

A novel cation-disordered rock-salt lithium titanium oxyfluoride (DRX-Li$_{x}$TiOF$_{2}$) enables fast-charging batteries and supercapacitors. This material operates at a low potential, significantly boosting energy density and cell voltage.

Keywords:
Anode materialsDisordered rock-salt materialsLithium-ion capacitorsPseudocapacitanceThree-dimensional Li+ percolation network

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Pseudocapacitive materials offer rapid charge storage for advanced batteries and supercapacitors.
  • Current pseudocapacitive anodes have high redox potentials, limiting overall cell voltage and energy density.
  • Developing low-potential pseudocapacitive anodes is crucial for enhancing energy storage performance.

Purpose of the Study:

  • To introduce a new cation-disordered rock-salt lithium titanium oxyfluoride (DRX-Li$_{x}$TiOF$_{2}$) as a high-performance pseudocapacitive anode.
  • To investigate its electrochemical properties, particularly its low operating potential and high-rate capability.
  • To elucidate the structural origins of its pseudocapacitive behavior and its impact on energy storage devices.

Main Methods:

  • Synthesis and characterization of cation-disordered rock-salt lithium titanium oxyfluoride (DRX-Li$_{x}$TiOF$_{2}$).
  • Electrochemical testing including cyclic voltammetry, galvanostatic charge-discharge at high rates, and rate capability analysis.
  • Structural analysis to correlate disorder and ion migration pathways with pseudocapacitive performance.

Main Results:

  • DRX-Li$_{x}$TiOF$_{2}$ reversibly stores ~310 mAh g$^{-1}$ of Li$^{+}$ at a low potential window down to 0.1 V vs. Li$^{+}$/Li.
  • The material exhibits high-rate performance exceeding 64.4 C, attributed to a 3D percolation network facilitating fast Li$^{+}$ migration.
  • Absence of phase transformation, quasi-rectangular CV curves, and sloping charge/discharge profiles confirm pseudocapacitive storage.
  • Lithium-ion capacitors using DRX-Li$_{x}$TiOF$_{2}$ achieve 4.0 V cell voltage with significantly higher energy and power densities compared to conventional anodes.

Conclusions:

  • DRX-Li$_{x}$TiOF$_{2}$ is a promising low-potential pseudocapacitive anode material for high-energy and fast-charging applications.
  • The cation/anion-disordered structure is key to enabling efficient Li$^{+}$ storage and transport.
  • This material offers a substantial advancement over existing pseudocapacitive and battery-type anodes for next-generation energy storage.