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Li and Ti Co-doping to stabilize slabs of high-voltage P2-type Na0.560[Li0.041Mn0.642Ni0.221Ti0.095]O2
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.jallcom.2020.153938
Bin Zhang , Biao Zhang , Lve Wang , Xu Chen , Yanluo Lu , Bin Xu , Wensheng Yang

Abstract De-sodiation of P2–Na0.60[Mn0.75Ni0.25]O2 cathode materials leads to substantial volume expansion, which induces the formation of large anisotropic stress. This stress results in broken, sliding, and exfoliated slabs of the layered structure during cycling, leading to severe capacity loss and voltage fade. In this work, we prepare high-voltage Na0.560[Li0.041Mn0.642Ni0.221Ti0.095]O2 co-doped with Li and Ti using a chemical-precipitation-assisted solid-state reaction. Co-doping with Li and Ti is aimed to release stress and stabilize the slabs, which are maintained for the co-doped Na0.560[Li0.041Mn0.642Ni0.221Ti0.095]O2 materials. The material has high capacity retention and high voltage retention of 74.2% and 95.9%, respectively, after 100 cycles in the voltage range of 2.5–4.5 V vs. Na/Na+. This enhanced cycling performance is attributed to the functionality of Ti and Li. The strong Ti–O bond (compared with Mn/Ni–O bond) strengthens the slabs, and the migration of Li releases the stress by tuning the electrostatic repulsion.

中文翻译:

Li和Ti共掺杂稳定高压P2型Na0.560[Li0.041Mn0.642Ni0.221Ti0.095]O2板坯

摘要 P2-Na0.60[Mn0.75Ni0.25]O2 正极材料的脱钠会导致大量的体积膨胀,从而导致大的各向异性应力的形成。这种应力导致循环过程中层状结构的破裂、滑动和剥落,导致严重的容量损失和电压衰减。在这项工作中,我们使用化学沉淀辅助的固态反应制备了与 Li 和 Ti 共掺杂的高压 Na0.560[Li0.041Mn0.642Ni0.221Ti0.095]O2。与锂和钛共掺杂的目的是释放应力并稳定板坯,而共掺杂的 Na0.560[Li0.041Mn0.642Ni0.221Ti0.095]O2 材料保持了这种状态。在 2.5-4.5 V vs. Na/Na+ 电压范围内循环 100 次后,该材料具有高容量保持率和高电压保持率,分别为 74.2% 和 95.9%。这种增强的循环性能归因于 Ti 和 Li 的功能。强 Ti-O 键(与 Mn/Ni-O 键相比)加强了板坯,并且 Li 的迁移通过调节静电排斥来释放应力。
更新日期:2020-05-01
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