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Thermodynamics of Miscible Polymer Electrolytes- [electronic resource]
Thermodynamics of Miscible Polymer Electrolytes - [electronic resource]
Thermodynamics of Miscible Polymer Electrolytes- [electronic resource]

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자료유형  
 학위논문파일 국외
최종처리일시  
20240214101600
ISBN  
9798380367561
DDC  
660
저자명  
Shah, Neel Jaymin.
서명/저자  
Thermodynamics of Miscible Polymer Electrolytes - [electronic resource]
발행사항  
[S.l.]: : University of California, Berkeley., 2023
발행사항  
Ann Arbor : : ProQuest Dissertations & Theses,, 2023
형태사항  
1 online resource(107 p.)
주기사항  
Source: Dissertations Abstracts International, Volume: 85-03, Section: B.
주기사항  
Advisor: Balsara, Nitash P.
학위논문주기  
Thesis (Ph.D.)--University of California, Berkeley, 2023.
사용제한주기  
This item must not be sold to any third party vendors.
초록/해제  
요약There is a growing need for improvements in renewable energy sources and in energy storage devices as the effects of global warming become more acute. Conventional lithium-ion batteries are composed of a lithium-graphite composite anode, a liquid electrolyte and a transition metal oxide cathode. Replacing the lithium-graphite anode with a lithium metal anode would greatly increase the energy density of these batteries, enabling higher range electric vehicles and significant improvements in consumer electronics. However, lithium metal anodes are incompatible with conventional liquid electrolytes, prone to dendrites and pose significant safety hazards. There has been significant research into replacing conventional liquid electrolytes with polymer electrolytes, which are significantly less flammable than liquid electrolytes, and have a higher modulus thereby suppressing dendrite growth. However, current polymer electrolytes cannot match the ion transport characteristics of conventional liquid electrolytes. To address this, researchers have attempted to combine various polymeric components with lithium salt to create an electrolyte that is both highly conductive and mechanically rigid. The thermodynamics of conventional polymer electrolytes are still poorly understood. In this Dissertation we study the effect of added salt on the thermodynamic properties of block copolymers and polymer blends comprised of poly(ethylene oxide) (PEO) and poly(methylmethacrylate) (PMMA). This Dissertation represents the first comprehensive study of the thermodynamics of a miscible polymer electrolyte system.In Chapter 2, we synthesize a series of PEO-PMMA block copolymers and analyze the effect of added lithium bis(trifluoromethane) sulfonimide (LiTFSI) salt on the phase behavior utilizing small angle X-ray scattering (SAXS). We calculate thermodynamics interaction parameters for this system and find that the effective thermodynamic interaction parameter, χeff, varies nonmonotonically with respect to salt concentration. We shed light upon the complex phase separation of PEO-PMMA/LiTFSI block copolymer electrolytes, which deviates from conventional block copolymer electrolytes. In Chapter 3, we prepare a series of PEO/PMMA/LiTFSI blend electrolytes and analyze the phase behavior of these blends via small angle neutron scattering. We find that both blend composition and salt concentration have a significant effect on polymer blend electrolyte phase behavior. We extract thermodynamic interaction parameters from the collected scattering data and build a thermodynamic model to predict blend phase behavior. We find that our model is in good agreement with our experimental data.In Chapter 4, we expand on our characterization of PEO/PMMA/LiTFSI blend electrolyte phase behavior by using light scattering to augment our previous phase characterization work. We create a comprehensive phase diagram of PEO/PMMA/LiTFSI polymer blends. This phase diagram presents some of the first experimental evidence of multiple immiscible windows in polymer blend electrolytes. We utilize our previously developed thermodynamic model to create a simulated phase diagram and find good agreement between theory and experiment. This work provides new insights into polymer-salt interactions and the underlying thermodynamics of polymer electrolytes. The goal of this Dissertation is to further analyze the complex thermodynamics of polymer electrolytes to enable design of future polymer electrolytes for lithium metal batteries.
일반주제명  
Chemical engineering.
일반주제명  
Materials science.
일반주제명  
Thermodynamics.
일반주제명  
Polymer chemistry.
키워드  
Batteries
키워드  
Polymer electrolytes
키워드  
Thermodynamic properties
키워드  
Copolymer electrolytes
키워드  
Light scattering
기타저자  
University of California, Berkeley Chemical Engineering
기본자료저록  
Dissertations Abstracts International. 85-03B.
기본자료저록  
Dissertation Abstract International
전자적 위치 및 접속  
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MARC

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■035    ▼a(MiAaPQ)AAI30575670
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a660
■1001  ▼aShah,  Neel  Jaymin.
■24510▼aThermodynamics  of  Miscible  Polymer  Electrolytes▼h[electronic  resource]
■260    ▼a[S.l.]:▼bUniversity  of  California,  Berkeley.  ▼c2023
■260  1▼aAnn  Arbor  :▼bProQuest  Dissertations  &  Theses,  ▼c2023
■300    ▼a1  online  resource(107  p.)
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-03,  Section:  B.
■500    ▼aAdvisor:  Balsara,  Nitash  P.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  Berkeley,  2023.
■506    ▼aThis  item  must  not  be  sold  to  any  third  party  vendors.
■520    ▼aThere  is  a  growing  need  for  improvements  in  renewable  energy  sources  and  in  energy  storage  devices  as  the  effects  of  global  warming  become  more  acute.  Conventional  lithium-ion  batteries  are  composed  of  a  lithium-graphite  composite  anode,  a  liquid  electrolyte  and  a  transition  metal  oxide  cathode.  Replacing  the  lithium-graphite  anode  with  a  lithium  metal  anode  would  greatly  increase  the  energy  density  of  these  batteries,  enabling  higher  range  electric  vehicles  and  significant  improvements  in  consumer  electronics.  However,  lithium  metal  anodes  are  incompatible  with  conventional  liquid  electrolytes,  prone  to  dendrites  and  pose  significant  safety  hazards.  There  has  been  significant  research  into  replacing  conventional  liquid  electrolytes  with  polymer  electrolytes,  which  are  significantly  less  flammable  than  liquid  electrolytes,  and  have  a  higher  modulus  thereby  suppressing  dendrite  growth.  However,  current  polymer  electrolytes  cannot  match  the  ion  transport  characteristics  of  conventional  liquid  electrolytes.  To  address  this,  researchers  have  attempted  to  combine  various  polymeric  components  with  lithium  salt  to  create  an  electrolyte  that  is  both  highly  conductive  and  mechanically  rigid.  The  thermodynamics  of  conventional  polymer  electrolytes  are  still  poorly  understood.  In  this  Dissertation  we  study  the  effect  of  added  salt  on  the  thermodynamic  properties  of  block  copolymers  and  polymer  blends  comprised  of  poly(ethylene  oxide)  (PEO)  and  poly(methylmethacrylate)  (PMMA).  This  Dissertation  represents  the  first  comprehensive  study  of  the  thermodynamics  of  a  miscible  polymer  electrolyte  system.In  Chapter  2,  we  synthesize  a  series  of  PEO-PMMA  block  copolymers  and  analyze  the  effect  of  added  lithium  bis(trifluoromethane)  sulfonimide  (LiTFSI)  salt  on  the  phase  behavior  utilizing  small  angle  X-ray  scattering  (SAXS).  We  calculate  thermodynamics  interaction  parameters  for  this  system  and  find  that  the  effective  thermodynamic  interaction  parameter,  χeff,  varies  nonmonotonically  with  respect  to  salt  concentration.  We  shed  light  upon  the  complex  phase  separation  of  PEO-PMMA/LiTFSI  block  copolymer  electrolytes,  which  deviates  from  conventional  block  copolymer  electrolytes. In  Chapter  3,  we  prepare  a  series  of  PEO/PMMA/LiTFSI  blend  electrolytes  and  analyze  the  phase  behavior  of  these  blends  via  small  angle  neutron  scattering.  We  find  that  both  blend  composition  and  salt  concentration  have  a  significant  effect  on  polymer  blend  electrolyte  phase  behavior.  We  extract  thermodynamic  interaction  parameters  from  the  collected  scattering  data  and  build  a  thermodynamic  model  to  predict  blend  phase  behavior.  We  find  that  our  model  is  in  good  agreement  with  our  experimental  data.In  Chapter  4,  we  expand  on  our  characterization  of  PEO/PMMA/LiTFSI  blend  electrolyte  phase  behavior  by  using  light  scattering  to  augment  our  previous  phase  characterization  work.  We  create  a  comprehensive  phase  diagram  of  PEO/PMMA/LiTFSI  polymer  blends.  This  phase  diagram  presents  some  of  the  first  experimental  evidence  of  multiple  immiscible  windows  in  polymer  blend  electrolytes.  We  utilize  our  previously  developed  thermodynamic  model  to  create  a  simulated  phase  diagram  and  find  good  agreement  between  theory  and  experiment. This  work  provides  new  insights  into  polymer-salt  interactions  and  the  underlying  thermodynamics  of  polymer  electrolytes.  The  goal  of  this  Dissertation  is  to  further  analyze  the  complex  thermodynamics  of  polymer  electrolytes  to  enable  design  of  future  polymer  electrolytes  for  lithium  metal  batteries.
■590    ▼aSchool  code:  0028.
■650  4▼aChemical  engineering.
■650  4▼aMaterials  science.
■650  4▼aThermodynamics.
■650  4▼aPolymer  chemistry.
■653    ▼aBatteries
■653    ▼aPolymer  electrolytes
■653    ▼aThermodynamic  properties
■653    ▼aCopolymer  electrolytes
■653    ▼aLight  scattering
■690    ▼a0542
■690    ▼a0794
■690    ▼a0348
■690    ▼a0495
■71020▼aUniversity  of  California,  Berkeley▼bChemical  Engineering.
■7730  ▼tDissertations  Abstracts  International▼g85-03B.
■773    ▼tDissertation  Abstract  International
■790    ▼a0028
■791    ▼aPh.D.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16934357▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.
■980    ▼a202402▼f2024

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