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High-efficiency,self-grinding exfoliation of small graphene nanosheets from microcrystalline graphite driven by microbead milling as conductive additives

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Science China Materials 2022年第9期65卷 2463-2471页

作者： Limei Huang Hao Li Xinxin Wang Yuanli Ding Jianfeng Wang Lei Jiang College of Materials Science and Engineering Hunan UniversityChangsha 410082China College of Chemistry and Chemical Engineering Hunan UniversityChangsha 410082China CAS Key Laboratory of Bio-Inspired Materials and Interface Sciences Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

Direct mass exfoliation of graphene from bulk graphite with high yield and productivity for commercial applications is *** work proposes self-grinding exfoliation using the mutual shear friction of graphite particles to fabricate graphene from microcrystalline *** concept is implemented using microbeads as the grinding medium to drive the shear friction between graphite nanocrystals in a high-concentration *** proposed approach substantially improves graphene yield from 6.3% to 100% and simultaneously generates a record productivity of 7.5 g h^(-1)L^(-1),achieving total graphite-to-graphene conversion on the kilogram *** as-prepared graphene nanosheets have an average lateral size of 298 nm and the same C/O atomic ratio as the pristine *** addition,the well-exfoliated,small nanosheets display good electrical conductivity and exhibit significant potential as conductive additives that improve the specific capacity and cyclic stability of Li-ion batteries better than commercial carbon-based conductive particles.

关键词： self-grinding exfoliation microcrystalline graphite graphene conductive additive

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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 ***,poly(tetrafluoroethylene)(noted as PTFE)coating microcrystalline graphite is designed as the sodium metal anode host by a facile and cost-effective *** isotropous microcrystalline graphite(MG)is conducive to guiding Na+to form a co-intercalation structure into *** the PTFE coating layer can form NaF as artificial SEI film for uniform ion transport and *** 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 *** 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 *** 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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Multiple structure graphite stabilized stearic acid as composite phase change materials for thermal energy storage

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International Journal of Mining Science and Technology 2022年第6期32卷 1419-1428页

作者： Xinbo Zhao Chuanchang Li Kaihao Bai Baoshan Xie Jian Chen Qingxia Liu School of Energy and Power Engineering Changsha University of Science and TechnologyChangsha 410114China Julong College Shenzhen Technology UniversityShenzhen 518118China

This paper used 3 types of graphite with different physical structures as the porous matrix to prepare composite phase change materials(PCMs),and investigated their photo-thermal conversion performance and application in battery thermal *** structure graphite minerals,including microcrystalline graphite(MG),scale graphite(SG),and expanded graphite(EG)were used as porous matrix,while stearic acid(SA)acts as the phase change *** vacuum impregnation method was applied to prepare SA/MG,SA/SG,SA/EG,and SA/MG1,and SA/EG1was/were prepared by the ethyl alcohol *** show that the thermal conductivities of all composite phase change materials were 10.82 to 22.06 times higher than that of the pure ***(TG)analysis showed that the loadages of SA were 43.61%,18.74%,and 92.66%for SA/MG,SA/SG,and SA/EG *** load rates of SA were 18.98%and 18.88%for SA/MG1 and SA/EG1,*** the 3 types of graphite materials of different dimensions,the BET(Brunauer,Emmett,and Teller)surface area determines the maximum load of *** Fourier-transform infrared(FTIR)and X-ray diffraction(XRD)results indicated that there was good compatibility between the SA and the *** SA/EG1 has better thermophysical properties in heat energy storage and release *** thermal infrared images show that SA/EG1 has higher sensitivity to the temperature ***/EG1 has better photo-heat conversion performance than SA/SG and SA/MG1 attributed to the multilayer structure of ***/EG has better thermal management performance in the Li-ion batteries discharge process.

关键词： Phase change material microcrystalline graphite Scale graphite Expanded graphite Photo-thermal conversion Thermal management

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