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MgO-template synthesis of hollow N/O dual-doped carbon boxes as extremely stable anodes for potassium-ion batteries
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-08-08 , DOI: 10.1039/d2ta05082j Jianding Li 1 , Yun Zheng 2 , Wei Chen 3 , Wenshuai Zhu 1 , Yongyang Zhu 4 , Huajun Zhao 2 , Xiaozhi Bao 2 , Liqing He 5 , Linfeng Zhang 6
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-08-08 , DOI: 10.1039/d2ta05082j Jianding Li 1 , Yun Zheng 2 , Wei Chen 3 , Wenshuai Zhu 1 , Yongyang Zhu 4 , Huajun Zhao 2 , Xiaozhi Bao 2 , Liqing He 5 , Linfeng Zhang 6
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The abundant resources of potassium in the earth have prompted researchers to develop novel-concept potassium-ion batteries (PIBs) with higher energy density. Carbon-based materials are considered to be promising candidates as anodes in PIBs due to their low price, rich sources, fast electron transfer and environmental friendliness. However, they still face the challenges of low capacity and fast capacity fading during cycling. Herein, a strategy of a hollow cubic shape with porous structure has been developed to prepare hollow N/O dual-doped carbon boxes (H-NOCBs) by the three main steps of MgO template synthesis, the polymerization of dopamine on the MgO surface as well as the subsequent calcination of the mixture, and the etching of the MgO templates. The H-NOCBs exhibit superior cycling stability with the retained capacities of 178.8 mA h g−1 (500 mA g−1) and 123.3 mA h g−1 (1000 mA g−1) after 2500 and 10 000 cycles, respectively. The larger interlayer spacing and unique hollow shape with a porous structure could accommodate more potassium ions into the carbon matrix and relieve the volume expansion, contributing to a higher capacity and longer cycle life performance. The achievements in this work shed light on the preparation of outstanding carbon-based anodes for advanced PIBs.
中文翻译：
MgO模板合成空心N/O双掺杂碳盒作为钾离子电池极其稳定的阳极
地球上丰富的钾资源促使研究人员开发具有更高能量密度的新型概念钾离子电池（PIB）。碳基材料由于其价格低廉、来源丰富、电子转移快和环境友好等优点，被认为是 PIBs 阳极的有希望的候选者。然而，它们仍然面临着循环过程中容量低和容量衰减快的挑战。在此，通过 MgO 模板合成的三个主要步骤，多巴胺在 MgO 表面聚合为以及随后的混合物煅烧和氧化镁模板的蚀刻。H-NOCB 表现出优异的循环稳定性，保留容量为 178.8 mA hg-1 (500 mA g -1 ) 和 123.3 mA hg -1 (1000 mA g -1 ) 分别在 2500 和 10 000 个循环后。较大的层间距和具有多孔结构的独特中空形状可以将更多的钾离子容纳到碳基体中并缓解体积膨胀，从而有助于提高容量和更长的循环寿命性能。这项工作的成果为制备用于先进 PIB 的出色碳基阳极提供了启示。
更新日期：2022-08-08
中文翻译：
MgO模板合成空心N/O双掺杂碳盒作为钾离子电池极其稳定的阳极
地球上丰富的钾资源促使研究人员开发具有更高能量密度的新型概念钾离子电池（PIB）。碳基材料由于其价格低廉、来源丰富、电子转移快和环境友好等优点，被认为是 PIBs 阳极的有希望的候选者。然而，它们仍然面临着循环过程中容量低和容量衰减快的挑战。在此，通过 MgO 模板合成的三个主要步骤，多巴胺在 MgO 表面聚合为以及随后的混合物煅烧和氧化镁模板的蚀刻。H-NOCB 表现出优异的循环稳定性，保留容量为 178.8 mA hg-1 (500 mA g -1 ) 和 123.3 mA hg -1 (1000 mA g -1 ) 分别在 2500 和 10 000 个循环后。较大的层间距和具有多孔结构的独特中空形状可以将更多的钾离子容纳到碳基体中并缓解体积膨胀，从而有助于提高容量和更长的循环寿命性能。这项工作的成果为制备用于先进 PIB 的出色碳基阳极提供了启示。
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