The advancement of lithium-ion batteries with high power density at low temperature is limited by sluggish Li+ diffusion kinetics and exacerbated polarization effects. Herein, MoNb12-xVxO33 with abundant dislocations is constructed by a hetero-atom doping strategy, demonstrating enhanced fast rechargeability and low-temperature kinetics. The presence of dislocations in MoNb12-xVxO33 lattice has been confirmed using transmission electron microscope, inverse fast Fourier transform and geometrical phase analysis. The dislocation-rich structure enables a reduction in Li+ desolvation barrier, lowers Li+ site energy and enhances Li+ diffusion capability, particularly at low temperature. The boosted ion diffusion and electronic transport have been established through multiple kinetic analyses and theoretical calculations. Furthermore, the introduced dislocations facilitate stress reliefand maintain structural stability during rapid (de)lithiation procedures. Consequently, MoNb12-xVxO33 displays a high reversible capacity of 116.8 mAh g−1 at 100C. Particularly at −20 °C, MoNb12-xVxO33 demonstrates exceptional long-term cycling stability exceeding 7000 cycles at 5C with 98.9 % capacity retention.

中文翻译：

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位错工程 MoNb12-xVxO33 可在低温下实现超快速和稳定的锂储存


低温下高功率密度锂离子电池的发展受到 Li+ 扩散动力学缓慢和极化效应加剧的限制。本文通过杂原子掺杂策略构建了具有丰富位错的 MoNb12-xVxO33，表现出增强的快速充电性和低温动力学。MoNb12-xVxO33 晶格中存在位错已通过透射电子显微镜、逆快速傅里叶变换和几何相位分析得到证实。富含位错的结构能够减少 Li+ 脱溶剂位垒，降低 Li+ 位点能量并增强 Li+ 扩散能力，尤其是在低温下。通过多次动力学分析和理论计算，已经建立了增强离子扩散和电子传输。此外，引入的位错有助于在快速（去）锂化过程中消除应力并保持结构稳定性。因此，MoNb12-xVxO33 在 100C 时显示出 116.8 mAh g-1 的高可逆容量。特别是在 −20 °C 下，MoNb12-xVxO33 表现出卓越的长期循环稳定性，在 5C 下超过 7000 次循环，容量保持率为 98.9%。