Key Takeaways & Executive Findings
- •• • The modified Ni-rich cathode (LiNi0.9Co0.05Mn0.05O2) achieves a high specific capacity of 207.3 mA h g−1, which is critical for extending the driving range of electric vehicles. • • Cycling stability is exceptional with 97.6% capacity retention after 100 cycles, indicating reduced capacity fade and longer battery lifespan, directly addressing a key barrier to commercialization. • • Superior rate capability is demonstrated with 152.1 mA h g−1 at 10.0 C, enabling fast charging applications without significant capacity loss, a requirement for consumer electronics and EVs. • • Enhanced thermal stability is achieved through synergistic doping and coating, mitigating safety risks associated with Ni-rich cathodes, which is essential for large-scale adoption.
Abstract
Ni-rich layered oxide cathodes are pivotal candidates for next-generation lithium-ion batteries (LIBs) due to their high capacity and energy density. However, their susceptibility to structural deterioration and interfacial degradation during cycling causes substantial capacity fade, hindering commercialization. This work proposes a synergistic strategy of lattice doping and in situ surface coating to enhance structural integrity and interfacial stability of LiNi0.9Co0.05Mn0.05O2. La and Y dopants act as pillars to reinforce the layered structure, mitigating volume changes and expanding c-axis spacing to facilitate Li+ diffusion. Concurrently, La4NiLiO8 and LiYO2 coatings protect the cathode from H2O/CO2 corrosion and electrolyte attack, while their high lithium-ion conductivity promotes Li+ transport. The modified cathode delivers exceptional electrochemical metrics: high specific capacity of 207.3 mA h g−1, remarkable cycling stability with 97.6% retention after 100 cycles, superior rate capability of 152.1 mA h g−1 at 10.0 C, and enhanced thermal stability. This work establishes a paradigm for multi-dimensional stabilization of Ni-rich cathodes via synergistic bulk and interface engineering, providing insights for designing high-performance energy storage systems.
1. Introduction
Ni-rich layered oxide cathodes (LiNixCoyMnzO2, x ≥ 0.8) are leading candidates for high-energy-density lithium-ion batteries, offering specific capacities exceeding 200 mA h g−1. However, their commercial deployment is hampered by severe capacity fade originating from structural and interfacial instabilities. During deep delithiation (>4.2 V), abrupt c-axis lattice contraction triggers detrimental H2-H3 phase transitions, leading to microcrack formation and accelerated oxygen loss. Additionally, highly reactive Ni4+ ions on particle surfaces readily react with electrolytes, generating harmful byproducts such as HF and reactive oxygen species, which further degrade the cathode. These issues are exacerbated by lattice oxygen evolution at high voltages, causing transformation of the surface layered phase into an electrochemically inert rock-salt phase, obstructing lithium-ion diffusion and diminishing capacity retention.
To overcome these bottlenecks, this study introduces a synergistic strategy combining lattice doping with La and Y and in situ surface coating with La4NiLiO8 and LiYO2. The dopants act as structural pillars, reinforcing the layered structure and expanding the c-axis spacing to facilitate Li+ diffusion, while the coatings provide a protective barrier against H2O/CO2 corrosion and electrolyte attack, and enhance Li+ transport due to their high ionic conductivity. This dual approach simultaneously addresses bulk structural integrity and interfacial stability, yielding exceptional electrochemical performance. The modified cathode achieves a high specific capacity of 207.3 mA h g−1, 97.6% capacity retention after 100 cycles, and a rate capability of 152.1 mA h g−1 at 10.0 C, along with improved thermal stability. This work provides a paradigm for multi-dimensional stabilization of Ni-rich cathodes, offering a practical pathway for next-generation LIBs with higher energy density and longer cycle life.
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CAO Hongmei, ZHANG Yudong, ZHANG Kai, YU Jie, LI Lin, CHEN Xiang, ZHOU Xunzhu (2026). Synergistic Bulk and Interface Engineering Empowering Exceptional Lithium Storage Performance of Ni-Rich Cathodes. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3841-6
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Frequently Asked Questions
What are the specific mechanisms by which La and Y doping mitigate structural degradation during high-voltage cycling?
La and Y dopants occupy transition metal or lithium sites in the crystal lattice, forming strong TM–O bonds that suppress oxygen release. They act as 'pillars' to reinforce the layered structure, mitigating volume changes during delithiation. Additionally, they expand the c-axis spacing, which facilitates Li+ diffusion and reduces the mechanical strain associated with H2-H3 phase transitions, thereby enhancing cycling stability.
How do the La4NiLiO8 and LiYO2 coatings improve interfacial stability and what is their impact on rate capability?
The coatings protect the cathode surface from attack by H2O, CO2, and electrolyte species, preventing the formation of harmful byproducts like HF. They also exhibit high lithium-ion conductivity, which promotes Li+ transport across the interface. This dual function reduces interfacial resistance and enhances rate capability, as evidenced by the high specific capacity of 152.1 mA h g−1 at 10.0 C.
What is the significance of achieving 97.6% capacity retention after 100 cycles for practical applications?
High capacity retention is crucial for extending the operational lifetime of lithium-ion batteries, especially in electric vehicles where battery replacement is costly. A retention of 97.6% after 100 cycles indicates minimal capacity fade, which translates to longer battery life and reduced total cost of ownership. This performance metric is competitive with or superior to many existing Ni-rich cathodes, making the material more viable for commercial use.
How does the synergistic approach compare to single-modification strategies in terms of electrochemical performance?
The synergistic approach addresses both bulk structural stability and interfacial protection simultaneously, which is more effective than single-modification strategies that target only one aspect. For instance, doping alone may improve structural integrity but leaves the surface vulnerable to electrolyte attack, while coating alone may protect the surface but does not mitigate bulk phase transitions. The combined strategy yields superior performance metrics, including high capacity, excellent cycling stability, and rate capability, as demonstrated in this study.
What are the potential scalability challenges for industrial production of this modified cathode material?
Scalability challenges include the uniform distribution of dopants and coatings at large scales, as well as the cost and availability of rare-earth elements like La and Y. However, the synthesis methods used (lattice doping and in situ coating) are relatively straightforward and can be adapted to existing industrial processes. The performance benefits, such as enhanced cycling stability and rate capability, may justify the additional costs, especially for high-end applications like electric vehicles.
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