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Updated: Aug 5, 2026
10:03
Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
Structural stabilization of high-voltage P2-type layered oxide cathodes through Li/Ti co-doping for sodium-ion
Yang Liu1, Yong Guo1, Xinxin Yin1
1State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, PR China. caoyali523@163.com.
Dalton Transactions (Cambridge, England : 2003)
|July 28, 2026
Summary
Li/Ti co-doping stabilizes high-voltage sodium-ion battery cathodes, improving capacity retention and cycling stability. This strategy enhances sodium-ion transport and mitigates structural degradation for durable energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- High-voltage P2-type Na2/3Ni1/3Mn2/3O2 cathodes are promising for sodium-ion batteries.
- Practical capacity retention is limited by Na+/vacancy ordering, layer gliding, phase evolution, and interfacial degradation.
Purpose of the Study:
- To develop a Li/Ti co-doping strategy to stabilize the transition-metal slab and regulate high-voltage charge compensation.
- To enhance the performance and durability of P2-type layered oxide cathodes for sodium-ion batteries.
Main Methods:
- Conventional solid-state reaction for synthesizing Li/Ti co-doped Na0.72Li0.1Ni0.23Mn0.5Ti0.17O2 (NL0.10NMTO).
- Electrochemical testing (capacity, rate capability, cycling stability).
- Advanced characterization techniques including galvanostatic intermittent titration, differential capacity analysis, potential-dependent impedance spectroscopy, and operando X-ray diffraction.
Main Results:
- The optimized NL0.10NMTO cathode retains the P2 framework with homogeneous elemental distribution.
- It delivers 131.1 mA h g-1 at 0.2 C between 2.5 and 4.5 V.
- The co-doped cathode shows improved rate capability and retains 99.7% capacity after 50 cycles, outperforming undoped NNMO.
Conclusions:
- Cooperative cation substitution effectively mitigates high-voltage structural degradation in P2-type layered oxides.
- Li/Ti co-doping accelerates Na+ transport and suppresses impedance growth.
- This strategy offers a feasible route for developing durable layered oxide cathodes for sodium-ion batteries.
