Constructing N-Doped Porous Carbon Confined FeSb Alloy Nanocomposite with Fe-N-C Coordination as a Universal Anode for Advanced Na/K-ion Batteries
Constructing N-Doped Porous Carbon Confined FeSb Alloy Nanocomposite with Fe-N-C Coordination as a Universal Anode for Advanced Na/K-ion Batteries
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构建具有 Fe-N-C 配位的 N 掺杂多孔碳限制 FeSb 合金纳米复合材料作为先进 Na/K 离子电池的通用阳极
DOI：
10.1016/j.cej.2019.123327
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发表时间：
2020
影响因子：
15.1
通讯作者：
Naiqin Zhao
中科院分区：
文献类型：
--
作者：
Zhiyuan Wang;Kangze Dong;Dan Wang;Shaohua Luo;Xin Liu;Yanguo Liu;Qing Wang;Yahui Zhang;Aimin Hao;Chunnian He;Chunsheng Shi;Naiqin Zhao
Sb基阳极在钠离子电池(SIB)和钾离子电池(PIB)中显示出了巨大的潜力，因为它们具有较高的理论容量和适用的电压平台，但它们通常存在严重的体积变化和离子扩散动力学迟缓的问题。为此，我们精心设计并制备了一种新型的N掺杂三维多孔碳网受限纳米FeSb合金复合材料(3DFeSb@NC)，这种独特的结构充分缓解了Sb在循环过程中的体积变化，缩短了离子/电子的扩散长度，提高了电子的导电性，并为Na+/K+的存储提供了丰富的活性中心。此外，较强的Fe-N-C键可以增强碳基与合金颗粒之间的界面结合，从而保持结构的完整性。在超长循环寿命方面，3D FeSb@NC阳极在SIB和PIB中都具有出色的电化学性能(SIB的容量在750次循环后保持85%，PIB在1000次循环后保持80%)和出色的倍率性能(SIB的5AG−1时为231mAhg−1，PIB的2 Ag−1时为119.7mAhg−1)。Na~+/K~+存储动力学分析表明，高倍率性能的主要原因是非本征伪电容的贡献。这项工作为开发具有优异结构稳定性和耐久性的SIBS/PIB纳米复合阳极提供了有效的策略。
Sb-based anodes have shown great potential in sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs).owing to their high theoretical capacities and applicable voltage platforms, but they usually suffer from severe.volume change and sluggish ion diffusion kinetic. Herein, a novel N-doped three-dimension porous carbon.network confined nanosized FeSb alloy composite (3D FeSb@NC) with a strong Fe-N-C bond is elaborately.designed and fabricated, this unique structure sufficiently relieves the volume change of Sb during cycling,.reduces the diffusion length for both ion/electrons, enhances the electronic conductivity, and provides abundant.active sites for Na + /K + storage. Moreover, the strong Fe-N-C bond can strengthen the interface adhesion be-.tween carbon matrix and alloy particle for sustaining structure integrity. The 3D FeSb@NC anodes delivers.outstanding electrochemical performances in both SIBs and PIBs, in terms of ultralong cycling life (capacity.retention of 85% after 750 cycles for SIBs and 80% after 1000 cycles for PIBs) and excellent rate capability.(231 mAhg −1 at 5Ag −1 for SIBs and 119.7mAh g −1 at 2 Ag −1 for PIBs). The kinetic analysis of Na + /K +.storage reveal that the extrinsic pseudo-capacitive contribution accounts for the high rate performance. This.work provides an effective strategy to develop nanocomposite anode with superior structural stability and.durability for SIBs/PIBs.