He, W.

Yue, Yuanzheng

Disorder is a universal structural feature of materials and plays a crucial role in inducing and changing functionality of materials. When nanoparticles are embedded in a glassy phase, disorder occurs in nanoparticles, glassy phase and interfaces. By appropriately controlling over the degree and type of disorder, material performances can be significantly enhanced. Disorder can be tuned by doping, calcination, redox reaction, composition tuning, and so on. Recently we have fabricated a cathode material for lithium ion battery by introducing heterostructure and disorder into the material. The material consists of microporous off-stoichiometric lithium iron/vanadium phosphate nanoparticles covered with a phosphate glassy layer, and carbon originated from biotemplates. The nanostructure is created by using biotemplates. Superlattice structure is found in the nanoparticles. This particular material exhibits the extremely high reversible lithium ion capacity and extraordinary rate capability with high cycling stability at high discharge current. In this presentation we demonstrate that the disorder plays a decisive role in achieving those exceptional electrochemical performances. We describe how the disorder affects the migration of both lithium ions and electrons. It is found that both the modified glassy surface and the heterogeneous superlattice structure greatly contribute to the extremely high discharge/charge rates owing to the enhanced storage capacity of lithium ions and ultrafast diffusion of both electrons and lithium ions. This work opens a new way towards high performance cathode materials for fabricating a new generation of electrochemical energy conversion devices and minitype high power storage devices

    Aalborg UniversitetRole of Disorder in Enhancing Lithium-Ion Battery PerformanceYue, Yuanzheng; He, W.Publication date:2014Document VersionPeer reviewed versionLink to publication from Aalborg UniversityCitation for published version (APA):Yue, Y., & He, W. (2014). Role of Disorder in Enhancing Lithium-Ion Battery Performance: An invited talk.Abstract from 1st Joint Meeting of DGG – ACerS GOMD, Aachen, Germany.General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            ? Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            ? You may not further distribute the material or use it for any profit-making activity or commercial gain            ? You may freely distribute the URL identifying the publication in the public portal ?Take down policyIf you believe that this document breaches copyright please contact us at vbn@aub.aau.dk providing details, and we will remove access tothe work immediately and investigate your claim.Downloaded from vbn.aau.dk on: April 24, 2017Role of Disorder in Enhancing Lithium-Ion Battery Performance  Yuanzheng Yue1,2 and Wen He1 1Shandong Key Laboratory of Glass and Ceramics Qilu University of Technology, Jinan 250353, China  2Section of Chemistry, Aalborg University, 9000 Aalborg, Denmark  Abstract: Disorder is a universal structural feature of materials and plays a crucial role in inducing and changing functionality of materials. When nanoparticles are embedded in a glassy phase, disorder occurs in nanoparticles, glassy phase and interfaces. By appropriately controlling over the degree and type of disorder, material performances can be significantly enhanced. Disorder can be tuned by doping, calcination, redox reaction, composition tuning, and so on. Recently we have fabricated a cathode material for lithium ion battery by introducing heterostructure and disorder into the material. The material consists of microporous off-stoichiometric lithium iron/vanadium phosphate nanoparticles covered with a phosphate glassy layer, and carbon originated from biotemplates. The nanostructure is created by using biotemplates [1,2]. Superlattice structure is found in the nanoparticles. This particular material exhibits the extremely high reversible lithium ion capacity and extraordinary rate capability with high cycling stability at high discharge current. In this presentation we demonstrate that the disorder plays a decisive role in achieving those exceptional electrochemical performances. We describe how the disorder affects the migration of both lithium ions and electrons. It is found that both the modified glassy surface and the heterogeneous superlattice structure greatly contribute to the extremely high discharge/charge rates owing to the enhanced storage capacity of lithium ions and ultrafast diffusion of both electrons and lithium ions. This work opens a new way towards high performance cathode materials for fabricating a new generation of electrochemical energy conversion devices and minitype high power storage devices.   References: 1. X.Y. Du, W. He, X.D. Zhang, Y.Z. Yue, H. Liu, X.G. Zhang, D.D. Min, X.X. Ge and Y. Du: “Enhancing electrochemical performances of lithium ion battery using mesoporous Li3V2(PO4)3/C microspheres”, Journal of Materials Chemistry 22 (2012) 5960-5969. 2. X.D. Zhang, Z.Y. Bi, W. He, G. Yang, H. Liu, Y.Z. Yue: “Fabricating high-energy quantum dots in ultra-thin LiFePO4 nanosheet using a multifunctional high-energy biomolecule -ATP”, Energy & Environmental Science (2014), DOI: 10.1039/c3ee44187c.  

Role of Disorder in Enhancing Lithium-Ion Battery Performance:An invited talk

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Role of Disorder in Enhancing Lithium-Ion Battery Performance:An invited talk

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