A high-tortuosity holey graphene in-situ derived from cytomembrane/cytoderm boosts ultrastable potassium storage  

作　　者：Jun Xiao Xin Min Yue Lin Qiyao Yu Wei Wang Xiaowen Wu Yangai Liu Zhaohui Huang Minghao Fang 

机构地区：[1]Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes,National Laboratory of Mineral Materials,School of Materials Science and Technology,China University of Geosciences(Beijing),Beijing,100083,China [2]CAS Key Laboratory of Design and Assembly of Functional Nanostructures,and State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou,350002,China [3]University of Chinese Academy of Sciences,Beijing,100049,China [4]State Key Laboratory of Explosion Science and Technology,School of Mechatronical Engineering,Beijing Institute of Technology,Beijing,100081,China [5]School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing,100083,China

出　　处：《Journal of Materials Science & Technology》2023年第8期69-78,共10页材料科学技术（英文版）

基　　金：This work was financially supported by the Program of Sci-ence and Technology International Cooperation Project of Qing-hai Province(No.2022-HZ-807);Young Elite Scientist Sponsorship Program by CAST(No.YESS20200103);Fundamental Research Funds for the Central Universities(No.2652019033).

摘　　要：The sluggish K^(+)kinetics and structural instability of the generally-used graphite and other carbon-based materials hinder the development of potassium-ion batteries(PIBs)for high-rate capability and long-term cycling.Herein,inspired by the unique flake structure and chemical composition of cytomembrane and cytoderm,we design high-tortuosity holey graphene as a highly efficient anode for PIBs.The flake cytomembrane and cytoderm shrink into wrinkled morphology during drying and sintering and then convert into high-tortuosity graphene after oxidative exfoliating and thermal reducing process.Mean-while,the proteins,sugars,and glycolipids embedded in cytomembrane and cytoderm can in-situ form nanoholes with highly abundant oxygenic groups and heteroatoms around,which can be easily removed and finally the high-tortuosity holey graphene is obtained after a thermal reducing process.The stress distribution after K^(+)intercalation confirms the optimized release of strain caused by the volume change through the finite element method.Benefiting from the unique nanoholes shortening the ion-diffusion length,the synergy of wrinkled and holey structure stabilizing volume fluctuation,and the enhanced electronic conductivity and specific surface area,the high-tortuosity holey graphene demonstrates high reversible capacities of 410 mAh g^(-1)at 25 mA g^(-1)after 150 cycles and retains 91.5%at 2 A g^(-1)after 2500 cycles.

关 键 词：Potassium-ion batteries GRAPHENE High tortuosity Cytomembrane and cytoderm ANODE 

分 类 号：TB333[一般工业技术—材料科学与工程]