Smart Membrane Separators for Enhanced Performance of Lithium-Ion Batteries

Smart Membrane Separators for Enhanced Performance of Lithium-Ion Batteries

Bibliographic Details
Main Author: Hery, Travis
Language:English
Published: The Ohio State University / OhioLINK 2019
Subjects:
Mechanical Engineering
Smart Membrane Separator
Lithium Ion Batteries
Ionic Redox Transistor
Conducting Polymer
Polypyrrole
PPy
DBS
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=osu1556886250674986
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-osu15568862506749862021-08-03T07:11:00Z Smart Membrane Separators for Enhanced Performance of Lithium-Ion Batteries Hery, Travis Mechanical Engineering Smart Membrane Separator Lithium Ion Batteries Ionic Redox Transistor Conducting Polymer Polypyrrole PPy DBS Lithium-ion batteries (LIBs), during high duty cycles, generate heat which can lead torapid and uncontrolled exothermic reactions known as thermal runaway, causing fires andexplosions. The goal of this dissertation is to develop a smart membrane separator (SMS)for the reversible shutdown of LIBs to prevent thermal runaway. In this work, it isdemonstrated that the conducting polymer polypyrrole doped withdodecylbenzenesulfonate (PPy(DBS)) will provide the necessary properties for the SMSbased on its controlled ion transport properties. PPy(DBS), in the oxidized state, iselectroneutral and does not interact with ions in solution. During reduction, the bulky,immobile DBS- dopants become excess negative charges in the polymer backbone and actas redox sites for cation ingress to maintain electroneutrality. It is therefore expected noion movement across the polymer will occur in its oxidized state, and the immobile DBS dopantswill serve as hopping sites for cation movement across the polymer in its reducedstate.This research has led to the development of a SMS for enhanced performance of LIBsand their reversible shutdown for thermal runaway prevention. The following originalcontributions have resulted from this work: (1) The fabrication of an ionic redox transistor(IRT) as an electrochemical device that regulates ion transport through its bulk as afunction of its redox state. This IRT consists of PPy(DBS) electropolymerized onto and spanning the pores of a thin, porous substrate. (2) A mechanistic interpretation for ion transport across PPy(DBS) polymer bulk. A geometric representation of redox sites is used to define ionic filaments for ion turnover. (3) The development of a model for reversible switching of ion charge type transport across PPy(DBS) in lithium salt containing organic solvents with low DBS- salt dissociation constants. A continuous spectrum for the balance of intrinsic binding energy of LiDBS ionic couples, electrochemical potential energy, and SMS redox state describes the reversible dissociation of ionic couples and the transport of either cations, anions, or no ions. (4) The application of the IRT in LIBs as a SMS is demonstrated for control of ion transport kinetics between the anode and cathode. An elevated temperature demonstration at 40°C simulated the prevention of thermal runaway. 2019-09-30 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1556886250674986 http://rave.ohiolink.edu/etdc/view?acc_num=osu1556886250674986 restricted--full text unavailable until 2024-08-05 This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Mechanical Engineering
Smart Membrane Separator
Lithium Ion Batteries
Ionic Redox Transistor
Conducting Polymer
Polypyrrole
PPy
DBS
spellingShingle Mechanical Engineering
Smart Membrane Separator
Lithium Ion Batteries
Ionic Redox Transistor
Conducting Polymer
Polypyrrole
PPy
DBS
Hery, Travis
Smart Membrane Separators for Enhanced Performance of Lithium-Ion Batteries
author Hery, Travis
author_facet Hery, Travis
author_sort Hery, Travis
title Smart Membrane Separators for Enhanced Performance of Lithium-Ion Batteries
title_short Smart Membrane Separators for Enhanced Performance of Lithium-Ion Batteries
title_full Smart Membrane Separators for Enhanced Performance of Lithium-Ion Batteries
title_fullStr Smart Membrane Separators for Enhanced Performance of Lithium-Ion Batteries
title_full_unstemmed Smart Membrane Separators for Enhanced Performance of Lithium-Ion Batteries
title_sort smart membrane separators for enhanced performance of lithium-ion batteries
publisher The Ohio State University / OhioLINK
publishDate 2019
url http://rave.ohiolink.edu/etdc/view?acc_num=osu1556886250674986
work_keys_str_mv AT herytravis smartmembraneseparatorsforenhancedperformanceoflithiumionbatteries
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