Hierarchical Ru-doped sodium vanadium fluorophosphates hollow microspheres as a cathode of enhanced superior rate capability and ultralong stability for sodium-ion batteries
Hierarchical Ru-doped sodium vanadium fluorophosphates hollow microspheres as a cathode of enhanced superior rate capability and ultralong stability for sodium-ion batteries
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多级Ru掺杂氟磷酸钠钒空心微球作为钠离子电池正极，具有增强的优异倍率性能和超长稳定性
DOI：
10.1016/j.nanoen.2016.11.023
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发表时间：
2017
期刊：
影响因子：
17.6
通讯作者：
Guo Guangsheng
中科院分区：
文献类型：
--
作者：
Peng Manhua;Zhang Dongtang;Zheng Limin;Wang Xiayan;Lin Yue;Xia Dingguo;Sun Yugang;Guo Guangsheng
采用低温溶剂热法合成了新型分级结构的Ru掺杂Na 3 V2 O2（PO 4）2F空心微球。单个独特的微球由直径为20-30 nm的许多纳米颗粒组装而成。当用作钠离子电池（SIB）的阴极材料时，该微球表现出优异的上级倍率性能，在10 C下的容量为72.6 mAh·g− 1。此外，它们的速率性能可以显着改善，通过涂覆一个薄的导电RuO 2层。例如，在20 C和100 C的电流速率下分别实现了102.5 mAh g− 1和44.9 mAh g− 1的高比容量。这些材料表现出令人印象深刻的长期循环稳定性。即使在7500次充电/放电循环后也保持约55.0 mAh g-1的可逆容量。密度泛函理论（DFT）的计算增加了我们的理解如何H+促进形成的分级微球超结构，这是有益的，以实现良好的速率能力。
Novel hierarchical Ru-doped Na3V2O2(PO4)2F hollow microspheres were synthesized via a low-temperature solvothermal method. The individual unique microspheres were formed from assembly of numerous nanoparticles with diameters of 20–30 nm. When used as a cathode material for sodium-ion batteries (SIBs), the microspheres exhibited superior rate performance with a capacity of 72.6 mAh·g−1at 10 C. Furthermore, their rate performance could be significantly improved by coating them with a thin conductive RuO2layer. For instance, high specific capacities of 102.5 mAh g−1and 44.9 mAh g−1were achieved at current rates of 20 C and 100 C, respectively. These materials exhibited impressive long-term cycling stability. A reversible capacity of approximately 55.0 mAh g−1was maintained even after 7500 charge/discharge cycles. Density functional theory (DFT) calculations increased our understanding of how H+facilitates the formation of the hierarchical microsphere superstructure which is beneficial to achieve a good rate capability.
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