Kesavan Thangaian, Partheeban Thamodaran, Vivekanantha Murugan, Prabu Natarajan, Kundu Manab, Selvarajan Premkumar, Umapathy Siva, Vinu Ajayan, Sasidharan Manickam
Energy Storage and Conversion and Catalysis Laboratory, SRM Research Institute and Department of Chemistry, SRM Institute of Science and Technology, Chennai 603203, Tamil Nadu, India.
Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India.
ACS Appl Mater Interfaces. 2020 May 27;12(21):24007-24018. doi: 10.1021/acsami.0c05123. Epub 2020 May 13.
Herein, we demonstrate a simple and unique strategy for the preparation of P-doped into the substructure of mesoporous carbon nitride materials (P-MCN-1) with ordered porous structures as a high-energy and high-power Li-ion battery (LIB) anode. The P-MCN-1 as an anode in LIB delivers a high reversible discharge capacity of 963 mAh g even after 1000 cycles at a current density of 1 A g, which is much higher than that of other counterparts comprising -triazine (CHN, g-CN), pristine MCN-1, and B-containing MCN-1 (B-MCN-1) subunits or carbon allotropes like CNT and graphene (rGO) materials. The P-MCN-1 electrode also exhibits exceptional rate capability even at high current densities of 5, 10, and 20 A g delivering 685, 539, and 274 mAh g, respectively, after 2500 cycles. The high electrical conductivity and Li-ion diffusivity (), estimated from electrochemical impedance spectra (EIS), very well support the extraordinary electrochemical performance of the P-MCN-1. Higher formation energy, lower bandgap value, and high Li-ion adsorption ability predicted by first principle calculations of P-MCN-1 are in good agreement with experimentally observed high lithium storage, stable cycle life, high power capability, and minimal irreversible capacity (IRC) loss. To the best of our knowledge, it is an entirely new material with the combination of ordered mesostructures with P codoping in carbon nitride substructure which offers superior performance for LIB, and hence we believe that this work will create new momentum for the design and development of clean energy storage devices.
在此，我们展示了一种简单且独特的策略，用于制备具有有序多孔结构的介孔氮化碳材料（P-MCN-1）子结构中掺杂磷的材料，作为高能高功率锂离子电池（LIB）阳极。P-MCN-1作为LIB的阳极，即使在1 A g的电流密度下经过1000次循环后，仍具有963 mAh g的高可逆放电容量，这远高于其他包含三嗪（CHN，g-CN）、原始MCN-1和含硼MCN-1（B-MCN-1）亚基或碳同素异形体如碳纳米管（CNT）和还原氧化石墨烯（rGO）材料的对应物。P-MCN-1电极即使在5、10和20 A g的高电流密度下也表现出优异的倍率性能，在2500次循环后分别提供685、539和274 mAh g的容量。根据电化学阻抗谱（EIS）估计的高电导率和锂离子扩散率（）很好地支持了P-MCN-1卓越的电化学性能。通过P-MCN-1的第一性原理计算预测的更高形成能、更低带隙值和高锂离子吸附能力与实验观察到的高锂存储、稳定循环寿命、高功率性能和最小不可逆容量（IRC）损失高度一致。据我们所知，这是一种全新的材料，具有有序介观结构与氮化碳子结构中磷共掺杂的组合，为LIB提供了卓越性能，因此我们相信这项工作将为清洁能源存储设备的设计和开发创造新的动力。
