Wang Xinxin, Yu Anyang, Jiang Tian, Yuan Shijun, Fan Qi, Xu Qingyu
School of Physics, Jiulonghu Campus, Southeast University, Nanjing, 211189, China.
School of Materials Science and Engineering, Jiulonghu Campus, Southeast University, Nanjing, 211189, China.
Adv Mater. 2024 Nov;36(47):e2410482. doi: 10.1002/adma.202410482. Epub 2024 Oct 10.
Despite the widespread commercialization of LiFePO as cathodes in lithium-ion batteries, the rigid 1D Li-ion diffusion channel along the [010] direction strongly limits its fast charge and discharge performance. Herein, lattice engineering is developed by the planar triangle BO substitution on tetrahedron PO to induce flexibility in the Li-ion diffusion channels, which are broadened simultaneously. The planar structure of BO may further provide additional paths between the channels. With these synergetic contributions, LiFe(PO)(BO) shows the best performance, which delivers the high-rate capacity (66.8 mAh g at 50 C) and long cycle stability (ultra-low capacity loss of 0.003% every cycle at 10 C) at 25 °C. Furthermore, excellent rate performance (34.0 mAh g at 40 C) and capacity retention (no capacity loss after 2500 cycles at 10 C) at -20 °C are realized.
尽管磷酸铁锂作为锂离子电池的阴极材料已广泛商业化，但沿[010]方向的刚性一维锂离子扩散通道严重限制了其快速充放电性能。在此，通过在四面体PO上进行平面三角形BO取代来开展晶格工程，以诱导锂离子扩散通道的灵活性，同时通道得以拓宽。BO的平面结构可能进一步在通道之间提供额外路径。通过这些协同作用，LiFe(PO)(BO)表现出最佳性能，在25°C下具有高倍率容量（50C时为66.8 mAh g）和长循环稳定性（10C时每循环超低容量损失0.003%）。此外，在-20°C时实现了优异的倍率性能（40C时为34.0 mAh g）和容量保持率（10C下2500次循环后无容量损失）。
