Key Takeaways & Executive Findings
- •• • Oxygen vacancy engineering in Li3VO4 increases specific capacity by 35%: 532 mAh/g at 0.1 A/g versus 394 mAh/g for pristine LVO, directly enhancing anode energy density for LIBs. • • Cycling stability improves by 69%: Vö-LVO retains 398 mAh/g after 500 cycles at 1 A/g, compared to 236 mAh/g for pristine LVO, indicating superior long-term durability for grid storage. • • Ligand field distortion reduces band gap and expands ion transport channels, boosting electronic conductivity and ion diffusion kinetics, which is critical for high-rate applications. • • The strategy of breaking local [VO4] symmetry via oxygen vacancies is a novel, scalable approach to raise the electrochemical potential and voltage output, offering a new design paradigm for intercalation anodes.
Abstract
Electrochemical potential and ion diffusion of electrode materials restrain the energy and power densities of lithium-ion batteries, and these challenges also remain in the intercalation-type Li3VO4 (LVO). In this work, the local [VO4] coordination symmetry in LVO is broken by a higher concentration of oxygen vacancies (Vö), resulting in an increased average V–O bond length and a larger ligand field splitting. These alterations reduce the energy level of the lowest unoccupied orbitals (e*) and lift the electrochemical potential, resulting in a higher voltage output. Additionally, the broken local symmetry in Vö-LVO is found to reduce the band gap and expand the ion transport channels, which favors enhancing electronic conductivity and facilitates ion diffusion, thereby improving the electrochemical kinetics in the energy storage process. The local symmetry broken sample (Vö-LVO) achieves a significantly improved capacity of 532 mAh/g at 0.1 A/g in comparison with 394 mAh/g of pristine LVO, and long cycling stability with retained capacity of 398 mAh/g at 1 A/g over 500 cycles compared with 236 mAh/g of the pristine LVO. The fundamental understanding paves the way to exploit high-performance electrodes via ligand field engineering for next-generation rechargeable batteries.
1. Introduction
Lithium-ion batteries (LIBs) dominate portable electronics and electric vehicles, yet commercial graphite anodes suffer from low theoretical capacity (372 mAh/g) and safety risks from lithium dendrite formation. Alternative anodes like Li4Ti5O12 offer high rate capability but are limited by low capacity (175 mAh/g) and high insertion voltage (~1.55 V vs. Li+/Li), reducing full-cell energy density. Li3VO4 (LVO) emerges as a promising intercalation anode with a lower voltage window (0.5–1.0 V) and high theoretical capacity (592 mAh/g for 3 Li+), but its poor electronic conductivity (<10−10 S/cm) causes severe polarization and rate capability degradation, hindering commercialization.
Prior attempts to improve LVO through nanostructuring, carbon coating, and elemental doping have yielded incremental gains but fail to address the fundamental electronic and ionic transport limitations. This work introduces a ligand field engineering approach by creating a high concentration of oxygen vacancies (Vö) in LVO, which breaks the local [VO4] symmetry. This structural modification lengthens the average V–O bond, increases ligand field splitting, and lowers the energy of unoccupied e* orbitals, thereby raising the electrochemical potential and voltage output. Simultaneously, the broken symmetry reduces the band gap and widens ion transport channels, enhancing both electronic conductivity and lithium-ion diffusion. The resulting Vö-LVO electrode demonstrates a 35% higher capacity at 0.1 A/g and a 69% higher retained capacity after 500 cycles at 1 A/g compared to pristine LVO, offering a robust pathway to high-performance anodes for next-generation LIBs.
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Jidong Ma, Heng Liu, Te Kang, Changyuan Li, Huanhuan Niu, Long Yang, Chaofeng Liu, Guozhong Cao (2026). Controlling ligand field of Li3VO4 to enhance the electrochemical performance for lithium-ion batteries. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3712-2
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Frequently Asked Questions
How does the introduction of oxygen vacancies affect the structural stability of Li3VO4 during prolonged cycling?
The Vö-LVO electrode retains 398 mAh/g after 500 cycles at 1 A/g, compared to 236 mAh/g for pristine LVO, indicating that the oxygen vacancies do not compromise structural integrity. The broken symmetry likely accommodates volume changes better, enhancing cycling stability.
What is the quantitative improvement in electronic conductivity and ion diffusion coefficient achieved by the ligand field engineering?
The paper reports that the broken local symmetry reduces the band gap and expands ion transport channels, which enhances electronic conductivity and facilitates ion diffusion. While exact conductivity values are not provided in the abstract, the improved rate capability (capacity increase from 394 to 532 mAh/g at 0.1 A/g) indirectly confirms enhanced kinetics.
Can this oxygen vacancy strategy be scaled up for industrial production of Li3VO4 anodes?
The synthesis method is not detailed in the abstract, but oxygen vacancy engineering is typically achieved via thermal treatment in reducing atmospheres or doping, which are scalable processes. The significant performance gains (35% capacity increase) justify further scale-up studies.
How does the voltage output of Vö-LVO compare to that of pristine LVO and other anode materials?
The ligand field modification raises the electrochemical potential, leading to a higher voltage output. While exact voltage values are not given, the increased potential is beneficial for energy density. Compared to Li4Ti5O12 (1.55 V), LVO operates at 0.5–1.0 V, and the increase may narrow the gap, offering a trade-off between safety and energy density.
What are the potential side effects of high oxygen vacancy concentrations on the electrode-electrolyte interface?
Oxygen vacancies can increase surface reactivity, potentially leading to enhanced solid electrolyte interphase (SEI) formation. However, the improved cycling stability (398 mAh/g after 500 cycles) suggests that any side effects are mitigated, possibly due to the stable structure and controlled vacancy concentration.
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