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Fe and Ti co-doped LiCoPO4 as High-voltage Cathode Materials for Lithium-ion Batteries
Shu-Yu Chen1, Shao-Chu Huang2, Tsung-Yi Chen3
1Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300044, Taiwan.
Journal of Colloid and Interface Science
|December 11, 2025
Summary
Iron and titanium co-doping enhances lithium cobalt phosphate, a high-voltage cathode material. This improves ionic conductivity and electrochemical performance for advanced lithium-ion batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Chemistry
Background:
- Lithium cobalt phosphate (LiCoPO4) is a promising high-voltage cathode material for lithium-ion batteries due to its high theoretical capacity and cobalt redox potential.
- However, its practical application is limited by poor ionic conductivity, stemming from a restrictive one-dimensional lithium diffusion pathway.
Purpose of the Study:
- To investigate the synergistic effects of co-doping with iron (Fe) and titanium (Ti) in LiCoPO4 to enhance its electrochemical properties.
- Specifically, to improve ionic conductivity and overall performance as a high-voltage cathode material.
Main Methods:
- Synthesis and characterization of LiCo0.9-2xFe0.1TixPO4 samples.
- Systematic evaluation of electrochemical, kinetic, and structural properties using techniques like PITT, GITT, and operando XRD.
- Comparative analysis of Fe-only doping versus Fe and Ti co-doping.
Main Results:
- Fe and Ti co-doped LiCoPO4 exhibited an initial discharge capacity of 121 mA h g-1 at 0.1C and 85% capacity retention after 200 cycles at 1C.
- Co-doping significantly improved lithium-ion diffusion coefficients (10^-11-10^-10 cm^2 s^-1) compared to Fe-only doping.
- Operando XRD revealed a transition from two-phase transition to solid-solution behavior upon Ti co-doping, indicating faster reaction kinetics.
Conclusions:
- Co-doping LiCoPO4 with Fe and Ti effectively enhances its structural stability and electrochemical performance.
- The synergistic effect of Fe and Ti improves ionic conductivity and rate capability, making it a superior high-voltage cathode material for lithium-ion batteries.
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