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Synthesis, Characterization, and Sta...

Kaplan, Carol,

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Synthesis, Characterization, and Stability of Cathode Materials for Use in Lithium-Ion Batteries /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Synthesis, Characterization, and Stability of Cathode Materials for Use in Lithium-Ion Batteries // Carol Kaplan.
Author:	Kaplan, Carol,
Description:	1 electronic resource (135 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 82-10, Section: B.
Contained By:	Dissertations Abstracts International82-10B.
Subject:	Chemistry. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28258021
ISBN:	9798597074719

Synthesis, Characterization, and Stability of Cathode Materials for Use in Lithium-Ion Batteries /
Kaplan, Carol,

Synthesis, Characterization, and Stability of Cathode Materials for Use in Lithium-Ion Batteries /Carol Kaplan. - 1 electronic resource (135 pages)

Source: Dissertations Abstracts International, Volume: 82-10, Section: B.

LiVOPO4 (LVP) is a promising next-generation multi-electron material with a theoretical capacity of 305 mAh/g, higher than any commercially used cathode material. LVP still faces significant commercialization challenges, including difficulty obtaining full theoretical capacity at fast rates and capacity fading over several cycles. In this paper, we show that a low temperature microwave-assisted solvothermal synthesis yields a pure LVP material that can achieve high capacity at fast rates with decent cycle stability. There is, however, evidence of side reactions occurring during cycling starting at 4.1 V that leads to a slight degradation of capacity over time. In this paper, we also compare the effects of different substituents on the electrochemical performance of LVP. Structurally, we show the Nb-substituted material adopts the beta phase, and the Ti-substituted LVP exhibits roughly 50/50 epsilon/beta phase, while all other substituents tend towards the epsilon phase. Ti-, Nb-, and Mo- substitution noticeably improved the electrochemical performance, while the other substituents either worsened or did not affect the material's electrochemical performance.Layered oxides are among one of the leading cathodes for lithium-ion batteries due to their high energy density. They are one of the more attractive options for electric vehicles, which makes their safety a top priority. It is well known that layered oxides produce oxygen upon heating, which can lead to exothermic reactions within the cell, aiding in thermal runaway. This paper will discuss the thermal stability of the high nickel layered oxides LiNi0.8Mn0.1Co0.1O2 (NMC 811) and LiNi0.8Co0.15Al0.05O2 (NCA) in different charged states with different electrolytes. Differential scanning calorimetry (DSC) is used to determine the heat produced upon heating in the presence of different electrolytes and indicates there is a difference with the electrolyte used. Operando microcalorimetry not only further indicates that one electrolyte might be better suited towards battery applications, but also indicates that NCA produces less heat during the initial charge. In situ XRD done while heating shows there is a difference in the decomposition pathway of NCA in the different electrolytes, while the same decomposition path is seen for NMC 811.

English

ISBN: 9798597074719Subjects--Topical Terms:

516420
Chemistry.
Subjects--Index Terms:

Cathode

Synthesis, Characterization, and Stability of Cathode Materials for Use in Lithium-Ion Batteries /
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245 1 0 $a Synthesis, Characterization, and Stability of Cathode Materials for Use in Lithium-Ion Batteries / $c Carol Kaplan.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2020
300 $a 1 electronic resource (135 pages)
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500 $a Source: Dissertations Abstracts International, Volume: 82-10, Section: B.
500 $a Advisors: Whittingham, M. S. Committee members: Dimitrov, Nikolay; Zhong, Chuan-Jian; Zhou, Guangwen; Jenkins, David.
502 $b Ph.D. $c State University of New York at Binghamton $d 2020.
520 $a LiVOPO4 (LVP) is a promising next-generation multi-electron material with a theoretical capacity of 305 mAh/g, higher than any commercially used cathode material. LVP still faces significant commercialization challenges, including difficulty obtaining full theoretical capacity at fast rates and capacity fading over several cycles. In this paper, we show that a low temperature microwave-assisted solvothermal synthesis yields a pure LVP material that can achieve high capacity at fast rates with decent cycle stability. There is, however, evidence of side reactions occurring during cycling starting at 4.1 V that leads to a slight degradation of capacity over time. In this paper, we also compare the effects of different substituents on the electrochemical performance of LVP. Structurally, we show the Nb-substituted material adopts the beta phase, and the Ti-substituted LVP exhibits roughly 50/50 epsilon/beta phase, while all other substituents tend towards the epsilon phase. Ti-, Nb-, and Mo- substitution noticeably improved the electrochemical performance, while the other substituents either worsened or did not affect the material's electrochemical performance.Layered oxides are among one of the leading cathodes for lithium-ion batteries due to their high energy density. They are one of the more attractive options for electric vehicles, which makes their safety a top priority. It is well known that layered oxides produce oxygen upon heating, which can lead to exothermic reactions within the cell, aiding in thermal runaway. This paper will discuss the thermal stability of the high nickel layered oxides LiNi0.8Mn0.1Co0.1O2 (NMC 811) and LiNi0.8Co0.15Al0.05O2 (NCA) in different charged states with different electrolytes. Differential scanning calorimetry (DSC) is used to determine the heat produced upon heating in the presence of different electrolytes and indicates there is a difference with the electrolyte used. Operando microcalorimetry not only further indicates that one electrolyte might be better suited towards battery applications, but also indicates that NCA produces less heat during the initial charge. In situ XRD done while heating shows there is a difference in the decomposition pathway of NCA in the different electrolytes, while the same decomposition path is seen for NMC 811.
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650 4 $a Materials science. $3 543314
650 4 $a Alternative energy. $3 3436775
653 $a Cathode
653 $a Layered oxides
653 $a Lithium-ion battery
653 $a Vanadyl phosphates
690 $a 0485
690 $a 0794
690 $a 0363
710 2 $a State University of New York at Binghamton. $b Chemistry. $e degree granting institution. $3 3765625
720 1 $a Whittingham, M. S. $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 82-10B.
790 $a 0792
791 $a Ph.D.
792 $a 2020
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28258021