Li₃VO₄ is one of the most promising candidates for high performance lithium-ion batteries due to its high specific capacity and excellent ionic conductivity, while its practical applications are hindered, because of its inferior rate capability. Herein, we adopted an anionic doping strategy to improve electronic conductivity, cycling stability and accelerate electrochemical kinetics. A series of F⁻ doped Li₃VO₄ samples were synthesized by a modified sol-gel method for the first time. F⁻ doping led to the appearance of oxygen vacancies and reduced band gap, which effectively improve electronic conductivity. Complete structural rearrangement and optimized SEI layers also occurred during cycling, beneficial for stable lifetime. As a consequence, long cycle life (cycling 1100 loops at 500 mA g⁻¹ except for the first 5 loops at 100 mA g⁻¹) and optimized rate capability (255 mA h g⁻¹ at 1000 mA g⁻¹) were achieved for 5 at% F doping, which are superior to those for undoped samples. This work demonstrates that anion doping is a feasible strategy to accelerate electrons/ions transfer and improve cycling stability of Li₃VO₄.

Li ₃ VO ₄的高比容量和出色的离子电导率使其成为高性能锂离子电池最有希望的候选者之一，但由于其差的倍率性能而阻碍了其实际应用。在本文中，我们采用了一种阴离子掺杂策略来提高电子电导率，循环稳定性并加速电化学动力学。一系列的F ^-掺杂锂₃ VO _4个样品通过首次一个改性的溶胶-凝胶法合成。˚F ^-掺杂导致出现氧空位和减小带隙，这有效地提高了电子传导性。在循环过程中还发生了完整的结构重排和优化的SEI层，有利于稳定的使用寿命。因此，长的循环寿命（循环1100次循环以500mA克^-1除了在100mA克前5环^-1）和优化的速率能力（255毫安ħ克^-1以1000mA克^-1），用于分别实现5 at％F掺杂，优于未掺杂样品。这项工作表明，阴离子掺杂是加速电子/离子转移和提高Li ₃ VO ₄循环稳定性的可行策略。