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Access Contact JP About IMROrganizationResearchCollaborationsEducation / Graduate SchoolPublic Relations / Open Facility About IMRDirector’s GreetingPrinciple and MissionHistorySuccessive DirectorsOrganization MapPersonnel / BudgetResearch Divisions and CentersLocation(Access)Honors and AwardsInternational CollaborationsGender Equality Promotion OrganizationResearchersLaboratories(Research Divisions)Research Facilities and Collaboration Research CentersService Divisions Organization MapCommittee ResearchRecent Research Activities [Press release]Representative Inventions/DevelopmentsResearch AchievementsResearch areasKINKEN Research Highlights(PR Magazins) CollaborationsAcademic Research Collaboration(GIMRT)GIMRT WebsiteGIMRT Application WebsiteIndustry-Academia CooperationInstruments Sharing System(Japanese text only)KINKEN Summer SchoolInternational Exchange(ICC-IMR Website) Education / Graduate SchoolGraduate SchoolsCollaborative coursesOverseas MembersAwards(students)Campus LifeFinancial Support Public Relations / Open FacilityEventsPublic Relations magazinesDigital Archive Honda Memorial HallIMR Library Website NewsNewsResearchAwardsNewsReportsInformationOpen Position HOME en News Research Mechanically Robust Self-Organized Crack-Free Nanocellular Graphene with Outstanding Electrochemical Properties in Sodium Ion Battery Research JP Mechanically Robust Self-Organized Crack-Free Nanocellular Graphene with Outstanding Electrochemical Properties in Sodium Ion Battery 2024/03/13 Ever since its discovery in 2004, graphene has been revolutionizing the field of materials science and beyond. Graphene comprises two-dimensional sheets of carbon atoms, bonded into a thin hexagonal shape with a thickness of one atom layer. This gives it remarkable physical and chemical properties. Despite its thinness, graphene is incredibly strong, lightweight, flexible, and transparent. It also exhibits extraordinary electrical and thermal conductivity, high surface area, and impermeability to gasses. From high-speed transistors to biosensors, it boasts an unrivaled versatility in applications. Nanocellular graphene (NCG) is a specialized form of graphene that achieves a large specific surface area by stacking multiple layers of graphene and controlling its internal structure with a nanoscale cellular morphology. NCG is coveted for its potential to improve the performance of electronic devices, energy devices and sensors. But its development has been stymied by defects that occur during the manufacturing process. Cracks often appear when forming NCG, and scientists are looking for new processing technologies that can fabricate homogeneous, crack-free and seamless NCGs at appropriate scales. "We discovered that carbon atoms rapidly self-assemble into crack-free NCG during liquid metal dealloying of an amorphous Mn-C precursor in a molten bismuth," says Won-Young Park, a graduate student at Tohoku University. Dealloying is a processing technique that exploits the varying miscibility of alloy components in a molten metal bath. This process selectively corrodes certain components of the alloy while preserving others. Park and his colleagues demonstrated that NCGs developed by this method exhibited high tensile strength and high conductivity after graphitization. Moreover, they put the material to the test in a sodium-ion battery (SIB). Schematic illustration for the formation NCG during liquid metal dealloying of amorphous manganese-carbon (Mn-C) alloy in a molten bismuth (Bi) to induce selective dissolution of manganese (Mn) atoms and self-organization of carbon (C) atoms into graphene layers. ©S.H. Joo & H. Kato. "We used the developed NCG as an active material and current collector in a SIB, where it demonstrated a high rate, long life and excellent deformation resistance. Ultimately, our method of making crack-free NCG will make it possible to raise the performance and flexibility of SIBs - an alternative technology to lithium-ion batteries for certain applications, particularly in large-scale energy storage and stationary power systems where cost, safety, and sustainability considerations are paramount." Working alongside Park was Soo-Hyun Joo from the Institute of Materials Research (currently based at Dankook University) along with Hidemi Kato from the same institute. Details of their research were published in the journal Advanced Materials on February 23, 2024. Their endeavors were made possible through collaboration with researchers from the Tohoku University&＃39;s Frontier Research Institute for Interdisciplinary Sciences and the Fracture and Reliability Research Institute; Pohang University of Science and Technology; and Johns Hopkins University. (2024/4/8 updated) Publication Details Title Mechanically Robust Self-Organized Crack-Free Nanocellular Graphene with Outstanding Electrochemical Properties in Sodium Ion Battery Authors Wong-Young Park, Jiuhui Han, Jongun Moon, Soo-Hyun Joo, Takeshi Wada, Yuji Ichikawa, Kazuhiro Ogawa, Hyoung Seop Kim, Mingwei Chen, Hidemi Kato* Journal Advanced Materials DOI 10.1002/adma.202311792 Online publication date February 23, 2024 Press release online (in Japanese) PDF:  1.48MB     Non-Equilibrium Materials Research Laboratory Next Previous NewsNewsNews2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003Research2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998Awards2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003News2020 2019 2018Reports2018 2017Information2022 2021 2020 2019 2018 2017Open 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Research CentersCenter for Computational Materials ScienceCenter of Neutron Science for Advanced MaterialsInternational Collaboration Center(ICC-IMR)Center for Advanced Light Source and Materials ScienceService DivisionsLaboratory of Low Temperature Materials ScienceLaboratory of alpha-Ray Emitters Analytical Research Core for Advanced MaterialsPublic Relations OfficeReview OfficeNetwork Office LibraryCounseling Office for Student, Faculty and StaffOffice of Safety and HealthTechnical Service CenterRelatedLocation(Access)Honors and AwardsInternational CollaborationsGender Equality PromotionOrganizationOrganizationResearchersLaboratories(Research Divisions)Research Facilities and Collaboration Research CentersService Divisions Organization MapOrganization MapCommittee Administrative OfficeCommitteeResearchResearchRecent Research Activities [Press release]Representative Inventions/DevelopmentsResearch AchievementsActl IMRResearch areasEnergy-Related MaterialsTheory of Solid State 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