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Updated: Aug 5, 2026
05:04
Determining the Mechanical Strength of Ultra-Fine-Grained Metals
Published on: November 22, 2021
Microstructure Engineered Ultrahigh-Nickel Cathode With Enhanced Mechanical Strength and Cycle Performance
Guihui Yu1, Bi Luo1, Shilin Su1
1National Engineering Laboratory For High-Efficiency Recovery of Refractory Nonferrous Metals, School of Metallurgy and Environment, Central South University, Changsha, P. R. China.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 31, 2026
Summary
Tantalum (Ta) doping refines primary particle structure in ultrahigh-nickel cathodes, reducing microcracks and enhancing stability. This strategy improves mechanical strength and cycling performance for advanced battery materials.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-state Chemistry
Background:
- Ultrahigh-nickel layered cathode materials are crucial for high-energy-density batteries.
- Particle microcracking and structural instability limit the performance of these cathodes during cycling.
- The precise mechanisms of how dopants like Tantalum (Ta) affect cathode microstructure and chemo-mechanical properties are not fully understood.
Purpose of the Study:
- To investigate the impact of Tantalum (Ta) doping on the microstructure and chemo-mechanical behavior of LiNi0.90Co0.05Mn0.05O2 cathodes.
- To elucidate the fundamental mechanisms linking Ta doping, primary particle evolution, and structural stability.
- To establish correlations between microstructural characteristics, mechanical properties, and electrochemical performance.
Main Methods:
- Synthesis of LiNi0.90Co0.05Mn0.05O2 cathodes with varying Tantalum (Ta) doping concentrations.
- Microstructural characterization using techniques to analyze primary particle morphology and alignment.
- Electrochemical cycling to evaluate performance and stability.
- Analysis of lattice microstrain and stress distribution during cycling.
Main Results:
- Tantalum (Ta) doping, specifically at 0.5 mol%, resulted in refined and radially aligned primary particles in LiNi0.90Co0.05Mn0.05O2 cathodes.
- Ta doping led to reduced lattice microstrain and more homogeneous stress distribution within the cathode particles.
- The engineered microstructure and improved stress management significantly enhanced mechanical strength and cycling stability.
Conclusions:
- Tantalum (Ta) doping is an effective strategy for tailoring the microstructure of Ni-rich layered cathodes.
- Refined primary particle morphology and controlled stress distribution are key to improving the structural integrity and electrochemical performance.
- This study provides a foundation for designing high-stability Ni-rich layered cathodes through microstructural engineering.
