Pseudocapacitive reaction enhanced porous Co0.85Se/N-doped carbon anodes for advanced sodium-ion battery with high rate and capacity
Pseudocapacitive reaction enhanced porous Co0.85Se/N-doped carbon anodes for advanced sodium-ion battery with high rate and capacity
复制标题
赝电容反应增强多孔Co0.85Se/N掺杂碳负极用于高倍率高容量先进钠离子电池
DOI：
10.1016/j.electacta.2019.134643
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发表时间：
2019
影响因子：
6.6
通讯作者：
He Deyan
中科院分区：
文献类型：
--
作者：
Liu Mengting;Jing Panpan;Wang Ting;Hou Xiaoyi;Liu Michael;Sun Zifei;Li Junshuai;He Deyan
钠离子电池在大型电子设备中的应用引起了广泛的关注。Na离子尺寸的增加是其在本体中缓慢扩散的主要因素，这对制造适用于SIB的活性材料提出了很大的挑战。在这里，我们提出了一套多孔Co0.85Se/N掺杂碳（Co0.85Se/NC）复合材料具有优良的比例（85%以上）的表面/近表面的赝电容Na离子现象。当在100 mA g−1下循环时，Co0.85Se/NC-1.0阳极提供713 mAh g−1的初始放电容量。在1000 mA g−1下的100次循环中，其可逆比容量高达509 mAh g−1。此外，该阳极还具有稳定的倍率性能，容量损失在100至5000 mA g−1之间。特别是，在5000 mA g −1时仍能提供382.8 mAh g − 1的容量。在众多的硒化钴基材料中，Co 0.85 Se/NC复合材料具有优异的Na+存储容量和倍率性能，是一种很有前途的SIB材料。
Sodium-ion batteries (SIBs) have attracted extensive interests for the large electronic equipment. Increased size of the Na-ion is the primary factor of its slow diffusion in the bulk, which poses big challenges for the manufacturing of active materials suitable for SIBs. Here, we present a set of porous Co0.85Se/N-doped carbon (Co0.85Se/NC) composites with an excellent ratio (above 85%) of surface/near-surface pseudocapacitance Na-ion phenomena. When cycled at 100 mA g−1, the Co0.85Se/NC-1.0 anode delivers an ultrahigh initial discharge capacity of 713 mAh g−1. During the 100 cycles under 1000 mA g−1, its reversible specific capacity is up to 509 mAh g−1. Besides, the anode also presents a robust rate performance with a limited capacity loss between 100 and 5000 mA g−1. Especially, a capacity of 382.8 mAh g−1is still delivered at 5000 mA g−1. Among the various cobalt selenide-based materials, such an outstanding Na+storage capacity and rate performance contribute the Co0.85Se/NC composites to be a promising candidate of SIBs.