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Advanced Materials Enabled by Atomic...

Chen, Lin.

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Advanced Materials Enabled by Atomic Layer Deposition for High Energy Density Rechargeable Batteries.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Advanced Materials Enabled by Atomic Layer Deposition for High Energy Density Rechargeable Batteries./
Author:	Chen, Lin.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
Description:	164 p.
Notes:	Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
Contained By:	Dissertation Abstracts International78-10B(E).
Subject:	Materials science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10271221
ISBN:	9781369852769

Advanced Materials Enabled by Atomic Layer Deposition for High Energy Density Rechargeable Batteries.
Chen, Lin.

Advanced Materials Enabled by Atomic Layer Deposition for High Energy Density Rechargeable Batteries. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 164 p.

Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.

Thesis (Ph.D.)--Illinois Institute of Technology, 2017.

In order to meet the ever increasing energy needs of society and realize the US Department of Energy (DOE)'s target for energy storage, acquiring a fundamental understanding of the chemical mechanisms in batteries for direct guidance and searching novel advanced materials with high energy density are critical.

ISBN: 9781369852769Subjects--Topical Terms:

543314
Materials science.

Advanced Materials Enabled by Atomic Layer Deposition for High Energy Density Rechargeable Batteries.
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100 1 $a Chen, Lin. $3 1017615
245 1 0 $a Advanced Materials Enabled by Atomic Layer Deposition for High Energy Density Rechargeable Batteries.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2017
300 $a 164 p.
500 $a Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
500 $a Advisers: Jeffrey W. Elam; Wei Chen.
502 $a Thesis (Ph.D.)--Illinois Institute of Technology, 2017.
520 $a In order to meet the ever increasing energy needs of society and realize the US Department of Energy (DOE)'s target for energy storage, acquiring a fundamental understanding of the chemical mechanisms in batteries for direct guidance and searching novel advanced materials with high energy density are critical.
520 $a To realize rechargeable batteries with superior energy density, great cathodes and excellent anodes are required. LiMn2O4 (LMO) has been considered as a simpler surrogate for high energy cathode materials like NMC. Previous studies demonstrated that Al2O3 coatings prepared by atomic layer deposition (ALD) improved the capacity of LMO cathodes. This improvement was attributed to a reduction in surface area and diminished Mn dissolution. However, here we propose a different mechanism for ALD Al 2O3 on LMO based on in-situ and ex-situ investigations coupled with density functional theory calculations. We discovered that Al2O 3 not only coats the LMO, but also dopes the LMO surface with Al leading to changes in the Mn oxidation state. Different thicknesses of Al2O 3 were deposited on nonstoichiometric LiMn2O4 for electrochemical measurements. The LMO treated with one cycle of ALD Al2O3 (1xAl 2O3 LMO) to produce a sub-monolayer coating yielded a remarkable initial capacity, 16.4% higher than its uncoated LMO counterpart in full cells. The stability of 1xAl2O3 LMO is also much better as a result of stabilized defects with Al species. Furthermore, 4xAl 2O3 LMO demonstrates remarkable capacity retention. Stoichiometric LiMn2O4 was also evaluated with similar improved performance achieved. All superior results, accomplished by great stability and reduced Mn dissolution, is thanks to the synergetic effects of Al-doping and ALD Al2O 3 coating.
520 $a Turning our attention to the anode, we again utilized aluminum oxide ALD to form conformal films on lithium. We elaborately designed and studied, for the first time, the growth mechanism during Al2O3 ALD on lithium metal in-situ quart crystal microbalance (QCM) measurements and found larger growth than expected during the initial cycles. Besides, we discovered that electrolytes show much enhanced wettability on Li with Al2O3 coating, leading to uniform and dense solid electrolyte interphase formation as well as less electrolyte required for battery operations. Also, we achieved more than 2 times longer cycling life with protected Li and obtained Coulombic efficiencies as high as &sim;98% at a practical current rate of 1 mA/cm2, compared to bare Li. More significantly, when the electrolyte volume is limited (10 muL and 5 muL), the cycling life is about 4 times longer. X-ray photoelectron spectroscopy (XPS) for electrodes after cycles and in-situ transmission electron microscopy (TEM) demonstrate that most of lithium is deposited beneath the film. The more uniform Al2O3 coated lithium after cycling observed by scanning electron microscopy (SEM) verifies that ALD Al2O 3 is exceptionally effective to prevent lithium dendrite formation. These results demonstrate that ALD Al2O3 coatings offer a promising route towards energy storage devices that utilize lithium metal anodes, such as Li-S batteries.
590 $a School code: 0091.
650 4 $a Materials science. $3 543314
650 4 $a Nanoscience. $3 587832
650 4 $a Nanotechnology. $3 526235
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710 2 $a Illinois Institute of Technology. $b Mechanical, Materials and Aerospace Engineering. $3 3276529
773 0 $t Dissertation Abstracts International $g 78-10B(E).
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791 $a Ph.D.
792 $a 2017
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10271221