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Optimized In Situ Doping Strategy Stabling Single-Crystal Ultrahigh-Nickel Layered Cathode Materials
Wei Wang1, Yanan Zhou2, Bao Zhang1,2
1Engineering Research Center of the Ministry of Education for Advanced Battery Materials, School of Metallurgy and Environment, Central South University, Changsha 410083, P. R. China.
ACS Nano
|March 7, 2024
Summary
Single-crystal cathodes with in situ doping show improved stability and performance. This method enhances mechanical properties and mitigates degradation in high-nickel lithium-ion batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Chemistry
Background:
- Single-crystal cathodes offer advantages over polycrystalline ones by reducing microcracks and side reactions.
- Micrometer-sized single crystals face challenges like slow ion diffusion and structural degradation, especially in high-nickel content materials.
Purpose of the Study:
- To develop an in situ doping strategy for single-crystal cathodes to enhance mechanical properties and electrochemical performance.
- To address sluggish ion kinetics and structural instability in ultrahigh-nickel layered cathodes.
Main Methods:
- An in situ doping strategy was employed to control crystal plane growth in single-crystal precursors.
- Doping with large-radius ions (e.g., Nb, Zr, W) ensured homogeneous distribution and improved substitution effects.
- Electrochemical testing under various conditions evaluated cycle retention and rate performance.
Main Results:
- In situ doping led to homogeneous ion distribution, minimizing undesirable coating layers and improving structural integrity.
- The doping strategy alleviated two-phase coexistence and optimized ion concentration gradients during cycling.
- Optimized single-crystal cathodes exhibited superior cycle stability and rate capabilities.
Conclusions:
- The in situ doping approach effectively enhances the mechanical properties and electrochemical performance of single-crystal cathodes.
- This strategy provides a viable pathway for developing high-energy-density, long-lifespan single-crystal cathodes for advanced energy storage applications.
