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Li/Ti Doping Modulates Biphasic Compatibility: A Synergistic Strategy for High-Performance Composite-Phase Sodium-Ion
Zhifeng Guo1, Liu Pei1, Zhenhong Li1
1Beijing Key Laboratory of Electrochemical Energy Storage Materials and Technologies; Department of Energy Storage Science and Engineering, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, P. R. China.
This study enhances sodium-ion battery cathodes using synergistic lithium and titanium co-doping to create an optimal biphasic structure. The resulting material shows improved capacity and cycle stability for advanced energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Biphasic composite structures are key for enhancing sodium-ion battery (SIB) performance.
- Current strategies often overlook the synergistic effects of multielement co-doping in biphasic materials.
Purpose of the Study:
- To investigate the synergistic doping of lithium (Li) and titanium (Ti) to regulate the O3/P2 biphasic structure in Na0.75Ni0.3Fe0.15Mn0.55O2.
- To enhance the electrochemical performance of layered oxide cathodes for SIBs.
Main Methods:
- Utilized synergistic Li+ and Ti4+ co-doping on a Na0.75Ni0.3Fe0.15Mn0.55O2 matrix.
- Analyzed the impact of doping on the O3/P2 phase ratio and crystal lattice stability.
- Evaluated the electrochemical performance of the co-doped cathode material.
Main Results:
- Li+ doping effectively adjusted the O3/P2 phase ratio, favoring a higher O3-phase proportion.
- Ti4+ doping significantly stabilized the crystal lattice structure.
- The optimized Na0.75Li0.05Ni0.3Fe0.15Mn0.4Ti0.1O2 cathode achieved 135 mAh g-1 at 0.05 C with 99% initial Coulombic efficiency.
- The material retained 86.1% capacity after 200 cycles at 1 C.
Conclusions:
- Synergistic Li and Ti co-doping is a viable strategy for designing high-performance biphasic layered oxide cathodes for SIBs.
- The optimized material demonstrates excellent capacity, Coulombic efficiency, and cycling stability.
- This approach offers a promising pathway for advancing SIB technology.
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