Germanium(Ge),an alloy-type anode material for lithium-ion batteries(LIBs),possesses many advan-tages such as high theoretical capacity and decent electrical conductivity.Nevertheless,its application is restricted by tremendous volume variation and tardy reaction kinetic during discharge/charge process.In this paper,the Ge/3DPG composites with Ge nanoparticles uniformly dispersed in 3D interconnected porous graphene(3DPG)skeleton are successfully prepared using a template-assisted in-situ reduction method.The unique 3D interconnected porous graphene can not only enhance the electronic conductiv-ity and reaction kinetics of the materials,but also provide sufficient buffer space to effectively mitigate the volume expansion during cycling and strengthen the structural integrity.Moreover,the small-sized Ge nanoparticles in close conjunction with the 3D graphene can boost the surface-controlled reaction of the electrode,which contributes to a fast charge-discharge rate capability.The Ge/3DPG composite with optimized Ge/graphene mass ratio delivers high reversible specific capacity(1102 mAh g-1 after 100 cycles at 0.2 C),outstanding rate capability(494 mAh g-1 at 5 C),and admirable cycling stability(85.3％of capacity retention after 250 cycles at 0.5 C).This work provides a significant inspiration for the design and fabrication of advanced Ge-based anode materials for next-generation high-performance LIBs.

Yao Chen;Yuming Zou;Xiaoping Shen;Jingxia Qiu;Jiabiao Lian;Jinrui Pu;Sheng Li;Fei-Hu Du;Shang-Qi Li;Zhenyuan Ji;Aihua Yuan

School of Material Science and Engineering,School of Chemistry and Chemical Engineering,Institute for Energy Research,Jiangsu University,Zhenjiang 212013,Jiangsu,China;School of Environmental and Chemical Engineering,Shanghai University,Shanghai 200444,China;School of Environmental&Chemical Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,Jiangsu,China

能源化学

[1]Yao Chen;Yuming Zou;Xiaoping Shen;Jingxia Qiu;Jiabiao Lian;Jinrui Pu;Sheng Li;Fei-Hu Du;Shang-Qi Li;Zhenyuan Ji;Aihua Yuan-.Ge nanoparticles uniformly immobilized on 3D interconnected porous graphene frameworks as anodes for high-performance lithium-ion batteries)[J].能源化学,2022(06):161-173

tardy,3DPG

nanoparticles,uniformly,immobilized,interconnected,porous,graphene,frameworks,anodes,high,performance,lithium,batteries,Germanium,alloy,type,LIBs,possesses,many,tages,such,theoretical,capacity,decent,electrical,conductivity,Nevertheless,its,application,restricted,by,tremendous,volume,variation,reaction,during,discharge,process,In,this,paper,composites,dispersed,skeleton,successfully,prepared,using,template,assisted,situ,reduction,method,unique,not,only,enhance,electronic,kinetics,materials,also,sufficient,buffer,space,effectively,mitigate,expansion,cycling,strengthen,structural,integrity,Moreover,small,sized,close,conjunction,boost,surface,controlled,electrode,which,contributes,fast,rate,capability,optimized,mass,delivers,reversible,specific,mAh,after,cycles,outstanding,admirable,stability,retention,This,provides,significant,inspiration,design,fabrication,advanced,next,generation

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