자료유형  

 학위논문

Control Number  

0016932710

International Standard Book Number  

9798379842376

Dewey Decimal Classification Number  

620

Main Entry-Personal Name  

Zhou, Xinwei.

Publication, Distribution, etc. (Imprint  

[S.l.] : Purdue University., 2020

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2020

Physical Description  

1 online resource(111 p.)

General Note  

Source: Dissertations Abstracts International, Volume: 85-01, Section: A.

General Note  

Advisor: Zhu, Likun;Wereley, Steven.

Dissertation Note  

Thesis (Ph.D.)--Purdue University, 2020.

Restrictions on Access Note  

This item must not be sold to any third party vendors.

Summary, Etc.  

요약Lithium-ion batteries (LIBs) have dominated the energy storage market in the past two decades. The high specific energy, low self-discharge, relatively high power and low maintenance of LIBs enabled the revolution of electronic devices and electric vehicle industry, changed the communication and transportation styles of the modern world. Although the specific energy of LIBs has increased significantly since first commercialized in 1991, it has reached a bottleneck with current electrode materials. To meet the increasing market demand, it is necessary to develop high capacity electrode materials.Current commercial anode material for LIB is graphite which has a specific capacity of 372 mAh g-1 . Other group IV elements (silicon (Si), germanium (Ge), tin (Sn)) have much higher capacities. However, group IV elements have large volume change during lithiation/delithiation, leading to pulverization of active materials and disconnection between electrode particles and current collector, resulting in fast capacity fading. To address this issue, it is essential to understand the microstructural evolution of Si, Ge and Sn during cycling.This dissertation is mainly focused on the morphological and structural evolution of Sn and Ge based materials. In this dissertation, an in situ focused ion beam-scanning electron microscopy (FIB-SEM) method is developed to investigate the microstructural evolution of a single electrode particle and correlate with its electrochemical performance. This method is applied to all projects. The first project is to investigate the microstructural evolution of a Sn particle during cycling. Surface structures of Sn particles are monitored and correlated with different states of charge. The second project is to investigate the morphological evolution of Ge particles at different conditions. Different structures (nanopores, cracks, intact surface) appear at different cycling rates. The third project is to study selenium doped Ge (GeSe) anodes. GeSe and Ge particles are tested at the same condition. Se doping forms Li-Ge-Se network, provides fast Li transport and buffers volume change. The fourth project is to study the reaction front of Ge particle during lithiation. Micronsized Ge particles have two reaction fronts and a wedge shape reaction interface, which is different from the well-known core-shell mode. The fifth project is to investigate antimony (Sb)-coated porous Ge particles. The Sb coating suppresses electrolyte decomposition and porous structure alleviates volume change. The results in this dissertation reveal fundamental information about the reaction mechanism of Sn and Ge anode. The results also show the effects of doping, porous structuring and surface coating of anode materials.

Subject Added Entry-Topical Term  

Silicon.

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Behavior.

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Graphite.

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Electrodes.

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Single crystals.

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Nanoparticles.

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Electric vehicles.

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Metal oxides.

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Cracks.

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Lithium.

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Composite materials.

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Scanning electron microscopy.

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Transmission electron microscopy.

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Carbon fibers.

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Electrolytes.

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Nanowires.

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Collectors.

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Phase transitions.

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Selenium.

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Ion beams.

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Analytical chemistry.

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Chemistry.

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Materials science.

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Nanotechnology.

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Transportation.

Added Entry-Corporate Name  

Purdue University.

Host Item Entry  

Dissertations Abstracts International. 85-01A.

Host Item Entry  

Dissertation Abstract International

Electronic Location and Access  

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Control Number  

joongbu:641531