Multiscale Hierarchically Engineered Carbon Nanosheets Derived from Covalent Organic Framework for Potassium‐Ion Batteries,Small Methods

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Multiscale Hierarchically Engineered Carbon Nanosheets Derived from Covalent Organic Framework for Potassium‐Ion Batteries
Small Methods ( IF 10.7 ) Pub Date : 2020-08-09 , DOI: 10.1002/smtd.202000159
Qing Xu ₁ , Qian Li ₂ , Yu Guo _{1,

3} , Dan Luo ₁ , Jing Qian ₁ , Xiaopeng Li ₄ , Yong Wang ₂

Affiliation

Previous research on potassium‐ion batteries (PIBs) indicates that promising carbon anode materials should have several carefully crafted features across different length scales including uniform heteroatom doping at atomic scale, proper carbon interspacing at sub‐nanoscale, and hierarchical pore system with pore size spanning from nano‐ to macro‐scale. However, it remains a grand challenge to construct a carbon material that possesses all the features. Here, this paper reports an attractive strategy of converting ordered mesoporous covalent organic framework (COF) via guest dopant inclusions and high‐temperature COF–guest interactions into carbon nanosheets with multilevel hierarchy. The as‐prepared carbon material exhibits homogeneous co‐doping of nitrogen and phosphorus, a large carbon layer interspacing of ≈0.4 nm, and rich micro/meso/macro‐pores. The assembled PIB anode delivers a high reversible potassium capacity of 404 mAh g⁻¹ at 100 mA g⁻¹, as well as excellent long‐term stability by maintaining a capacity of 179 mAh g⁻¹ at 1000 mA g⁻¹ over 2000 cycles, placing it in the rank of best‐performing carbon anodes for PIBs. This work demonstrates the intriguing power of COF–guest chemistry in hierarchically engineering carbon structures.

中文翻译：

源自钾离子电池共价有机框架的多尺度分层工程碳纳米片

以前对钾离子电池（PIBs）的研究表明，有希望的碳阳极材料应在不同的长度尺度上具有精心设计的特征，包括原子尺度上均匀的杂原子掺杂，亚纳米尺度上的适当碳分布以及具有孔径分布的分层孔隙系统从纳米到宏观然而，构造具有所有特征的碳材料仍然是巨大的挑战。在此，本文报道了一种有吸引力的策略，该策略通过客体掺杂物夹杂物和高温COF-客体相互作用将有序介孔共价有机框架（COF）转换为具有多层次结构的碳纳米片。所制备的碳材料表现出均匀的氮和磷共掺杂，大的碳层间距约为0.4 nm，以及丰富的微孔/中孔/大孔。组装好的PIB阳极具有404 mAh g的高可逆钾容量^-1以100mA克^-1，以及通过保持179毫安g的容量优异的长期稳定性^-1以1000mA克^-1超过2000个循环，将其放置在的等级表现最好的碳阳极进行的PIB 。这项工作证明了COF-客体化学在分级工程碳结构中的强大魅力。

更新日期：2020-09-10

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