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Multi-componential metal intercalated graphite hybrids synthesized by co-intercalation polymerization towards highefficient microwave absorptions

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Nano Research 2023年第5期16卷 6369-6379页

作者： Junhua Su Qinbo Ma Longkun Que Hunan Jiang Xiaoling Xu Yong Wang Yifan Guo Zuowan Zhou Key Laboratory of Advanced Technologies of Materials(Ministry of Education) School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China School of Chemistry Southwest Jiaotong UniversityChengdu 610031China Yibin Research Institute Southwest Jiaotong UniversityYibin 644000China School of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031China Research Institute of Frontier Science Southwest Jiaotong UniversityChengdu 610031China

Magnetic expanded graphite(EG)hybrids were synthesized by co-intercalation polymerization of aniline together with transition metal ions.Experimental results show that metal ions(Fe,co,Ni,Cu)and even their mixtures can co-intercalate into graphite interlayers with flexibly controllable ratios and contents.Among these co-intercalation compounds,Fe/Ni-intercalated graphite with a predesigned mole ratio of 1:3 transforms into NiFe_(2)O_(4)/FeNi_(3)@EG during the annealing process.The synthesized magnetic EG hybrids present multiband microwave absorption in C and X bands due to improved impedance match as well as significantly enhanced interfacial polarization relaxation induced by multi-componential metals.The reflection values of−39.1 dB at 6.95 GHz and−25.7 dB at 9.4 GHz are achieved with an ultra-low loading of 5 wt.%.This work provides a flexible approach for tuning the components and structures of magnetic EG hybrids,which may contribute to the development of microwave absorption materials with superior performances.

关键词： co-intercalation intercalation polymerization expanded graphite transition metal microwave absorption

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NaF-rich protective layer on PTFE coating microcrystalline graphite for highly stable Na metal anodes

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Nano Research 2023年第2期16卷 2436-2444页

作者： Yangyang Xie congyin Liu Jingqiang Zheng Huangxu Li Liuyun Zhang Zhian Zhang School of Metallurgy and Environment Engineering Research Center of the Ministry of Education for Advanced Battery MaterialsHunan Provincial Key Laboratory of Nonferrous Value-Added MetallurgyCentral South UniversityChangsha 410083China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China Department of Chemistry City University of Hong Kong Kowloon Hong KongChina

The practical application of Na metal anode is plagued by the dendrite growth,unstable solid electrolyte interphase(SEI)formation and volume change during the cycling process.Herein,poly(tetrafluoroethylene)(noted as PTFE)coating microcrystalline graphite is designed as the sodium metal anode host by a facile and cost-effective strategy.The isotropous microcrystalline graphite(MG)is conducive to guiding Na+to form a co-intercalation structure into MG.And the PTFE coating layer can form NaF as artificial SEI film for uniform ion transport and deposition.As a result,the gained PTFE coating MG electrode can deliver a long-life span over 1,200 cycles with an average coulombic efficiency(CE)of 99.88%.To note,almost the CE in each cycle is around 99.8%–100%.When assembled with Na_(3)V_(2)(PO_(4))_(2)F_(3)cathode as full cells,the full cell paired with PTFE coating MG electrode can operate much stable than that of MG electrode for the existence of PTFE coating layer.Even utilized as sodium-free Na metal anode paired with Na_(3)V_(2)(PO_(4))_(2)F_(3)cathode,it can also deliver a high initial CE of 76.27%at 0.5 C.After 100 cycles,it still has a high discharge capacity of 83.5 mAh·g^(−1).

关键词： Na metal anodes poly(tetrafluoroethylene)(PTFE) microcrystalline graphite co-intercalation uniform deposition

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