Facile renewable synthesis of nitrogen/oxygen co-doped graphene-like carbon nanocages as general lithium-ion and potassium-ion battery anodes
Facile renewable synthesis of nitrogen/oxygen co-doped graphene-like carbon nanocages as general lithium-ion and potassium-ion battery anodes
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DOI：
10.1016/j.carbon.2020.06.046
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发表时间：
2020-10-15
期刊：
影响因子：
10.9
通讯作者：
Tai, Renzhong
中科院分区：
文献类型：
--
作者：
Sun, Yuanhe;Zhu, Daming;Tai, Renzhong
环保型碳基材料作为碱性离子电池的一般负极具有潜在的应用前景。然而，现有的碳基材料还不能满足日益增长的高能量密度的需求，需要进一步积极探索。本论文以生物质胞苷为原料，采用一步法制备了氮氧共掺类石墨烯碳纳米笼(NOGCN)，并将其作为锂、钾电池的负极。所有的反应物都是完全可再生的，而且很容易获得。氮和氧的掺杂、较大的层间距和坚固的自支撑纳米笼结构极大地促进了电解液的渗透，改善了离子和电子传输的动力学，导致了非凡的电化学性能。合成的NOGCN电极在500 mA g(-1)下循环500次，锂离子存储容量为620 mA h g(-1)，并具有连续放大能力。此外，尽管使用了大尺寸的钾离子，但仍获得了令人印象深刻的可逆钾化容量(200 mA g(-1)下的355 mA h g(-1))和速度能力(114 mA h g(-1)在1000 mA g(-1)下)。动力学分析和密度泛函理论计算详细说明了N/O掺杂的类石墨烯结构的Li/K吸收特性，进一步证明了其在Li/K存储中的化学亲和性和优越性。本研究为制备具有良好应用前景的碱性离子电池负极材料提供了一种简便、完全可再生的方法。(C)2020爱思唯尔有限公司。保留所有权利。
Environmentally-friendly carbon-based materials possess the potential applications as general anode for alkali-ion batteries. However, the existing carbon-based materials cannot satisfy the increasing demand for high energy density and need further active exploration. Herein, nitrogen/oxygen co-doped graphene-like carbon nanocages (NOGCN) is synthesized from biomass cytidine on hydro-soluble sodium chloride nanocrystals by a one-step method as a general lithium and potassium-ion batteries anode. All reactants are completely renewable and readily available. The nitrogen/oxygen-doping, large interlayer spacing and robust self-supporting nanocage architecture greatly favour electrolyte penetration and improve the kinetics for ion and electron transport, resulting in extraordinary electrochemical performance. The synthesized NOGCN electrodes exhibit a high lithiation storage capacity of 620 mA h g(-1) over 500 cycles at 500 mA g(-1), with continuously magnifying capacity. Moreover, the impressive reversible potassiation capacity (355 mA h g(-1) at 200 mA g(-1)) and rate capability (114 mA h g(-1) at 1000 mA g(-1)) were achieved despite the large-sized potassium ions. Kinetic analysis and density functional theory calculations elaborately illustrate the Li/K-absorption properties of the N/O-doped graphene-like structure, further demonstrating the chemical affinity and superiority in Li/K storage. This study provides a facile and completely renewable method to prepare promising general anode material for alkali-ion batteries. (C) 2020 Elsevier Ltd. All rights reserved.