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Thermal stability of graphite/copper nanocrystalline composite powders prepared by high energy mechanical milling

Thermal stability of graphite/copper nanocrystalline composi...

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2011 First International Conference on high Performance Structures and Materials Engineering (ICHPSM 2011)

作者： Yong-ping Jin Ming Hu mechanical and Electronic Engineering Department Zhejiang Water Conservancy and Hydropower College Faculty of mechanical Engineering & Automation Zhejiang Sci-Tech University

To provide reference for choosing technological parameters of subsequent powder densification,thermal stability of 3 h-milled 3 wt%graphite/copper nanocrystalline composite powders were investigated with such analytical methods as scanning electron microscopy（SEM）,back-scattered electron images and X-ray diffraction（XRD）.The results show that diffraction peak of graphite in XRD pattern is absent because of too small graphite *** major variation of grain size of Cu with annealing temperature is *** and growth of graphite phase aren’t *** microhardness is nearly constant for the annealed ***,3 h-milled 3wt% graphite/copper nanocrystalline composite powders possess good thermal stability.

关键词： high energy mechanical milling graphite/copper nanocrystalline composite powders thermal stability

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Achieving high performance of Si-based anode materials for lithium ion battery via high energy mechanical milling

Achieving high performance of Si-based anode materials for l...

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第十一届海峡两岸超微颗粒学术研讨会暨中国颗粒学会超微颗...

作者： Jow-Lay Huang Chia-Chin Chang Shang-Chieh Hou Department of Materials Science and Engineering Cheng Kung University Hierarchical Green-energy Materials Research Center Cheng Kung University Center for Micro/Nano Science and Technology Cheng Kung University Department of Greenergy University of Tainan Research and Development Center for Li-ion Battery University of Tainan

In this work,we have developed a robust,cost-effect and friendly to operators and environment process to synthesize the high performance of Si-based composite powder as negative electrode materials for lithium ion batteries(LIBs).The feature of this research includes construction of top-down method using high energy mechanical milling(HEMM) to transform micrometric Si powder of crystalline phase into nanocrystalline/amorphous phase,combining withwet milling in specific medium to further reduced size of Si aggregate,simultaneously transferring function group to the surface of Si resulted in enhancing formation of solid electrolyte interface upon lithiation/***,Alloy designed Si/Cu3 Si composite powder is realized in all solid-state process by HEMM inducing mechanochemical ***3 Si compound strengthens Si-based composite and enhances ***,Si-based composite powder as the negative electrode performs high electrochemical properties and approaches practical and industrial application for LIBs.

关键词： Lithium-ion batteries Si-based negative electrode high energy mechanical milling mechanochemical reaction

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