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High-Throughput Computational Search for Li-Free Li-Ion Battery Cathodes
High-Throughput Computational Search for Li-Free Li-Ion Battery Cathodes
High-Throughput Computational Search for Li-Free Li-Ion Battery Cathodes

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202103540
ISBN  
9798288863646
DDC  
620.11
저자명  
Li, Haoming Howard.
서명/저자  
High-Throughput Computational Search for Li-Free Li-Ion Battery Cathodes
발행사항  
[Sl] : University of California, Berkeley, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
55 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
주기사항  
Advisor: Persson, Kristin A.
학위논문주기  
Thesis (Ph.D.)--University of California, Berkeley, 2025.
초록/해제  
요약As Li-metal anodes become more readily available, next-gen Li-ion battery cathodes are no longer required to contain Li in their as-synthesized state, vastly expanding the materials search space. In order to identify potential cathode materials that do not necessarily contain Li in their native state, I here present a series of tools and guidelines to carry out computational screening in this search space.Firstly, a pipeline for rapid cathode discovery has been established. This pipeline operates on any database of inorganic materials without a priori information on Li sites and performs screening based on computed voltage, capacity from sequential insertions of Li ions and most importantly, mobility built upon the graph-based migration network obtained through site connectivity. A preliminary application of the pipeline was carried out on a subset of the Materials Project database, and one particular polymorph of MnP2O7 is shown here as an an example of a new candidate compound which completed the pipeline and was selected for further, detailed analysis. The compound is shown to present a 2D ion migration topology, consisting of two separate intercalation pathways where the corresponding energy landscapes are calculated with the nudged-elastic band formalism. Acceptable energy barriers are found in the dilute (highly charged) limit, however the material is expected to exhibit slower kinetics in the vacancy (highly discharged) limit.Furthermore, a set of design principles are derived from data mining on voltage information from two classes of Li-ion battery cathodes. Most of Li-free cathodes are natively found in their charged state, in contrast to today's commercial lithium-ion battery cathodes, which are more stable in their discharged state. In this work, calculated cathode voltage information from both categories of cathode materials are combined, covering 5577 and 2423 total unique structure pairs, respectively. The resulting voltage distributions with respect to the redox pairs and anion types for both classes of compounds emphasize design principles for high-voltage cathodes, which favor later Period 4 transition metals in their higher oxidation states and more electronegative anions like fluorine or polyanion groups. Generally, cathodes that are found in their charged, delithiated state are shown to exhibit voltages lower than those that are most stable in their lithiated state, in agreement with thermodynamic expectations. Deviations from this trend are found to originate from different anion distributions between redox pairs.Lastly, a machine learning model for voltage prediction based on chemical formulae is trained on the data set obtained from the voltage distribution. This model displays sound connections to physical characteristics that impact cathode voltage and shows state-of-the-art performance when compared to two established composition-based ML models for materials properties predictions, Roost and CrabNet. The screening workflow, chemical design principles and the machine learning voltage model together compose a data-driven methodology for effectively executing high throughput materials discovery for practical and high-performance next-gen non-Li-containing cathodes.
일반주제명  
Materials science
일반주제명  
Engineering
일반주제명  
Physical chemistry
일반주제명  
Computational physics
키워드  
Li-metal anodes
키워드  
Li-ion battery cathodes
키워드  
Machine learning
키워드  
Polyanion groups
키워드  
CrabNet
기타저자  
University of California, Berkeley Materials Science & Engineering
기본자료저록  
Dissertations Abstracts International. 87-01B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aLi,  Haoming  Howard.
■24510▼aHigh-Throughput  Computational  Search  for  Li-Free  Li-Ion  Battery  Cathodes
■260    ▼a[Sl]▼bUniversity  of  California,  Berkeley▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a55  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-01,  Section:  B.
■500    ▼aAdvisor:  Persson,  Kristin  A.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  Berkeley,  2025.
■520    ▼aAs  Li-metal  anodes  become  more  readily  available,  next-gen  Li-ion  battery  cathodes  are  no  longer  required  to  contain  Li  in  their  as-synthesized  state,  vastly  expanding  the  materials  search  space.  In  order  to  identify  potential  cathode  materials  that  do  not  necessarily  contain  Li  in  their  native  state,  I  here  present  a  series  of  tools  and  guidelines  to  carry  out  computational  screening  in  this  search  space.Firstly,  a  pipeline  for  rapid  cathode  discovery  has  been  established.  This  pipeline  operates  on  any  database  of  inorganic  materials  without  a  priori  information  on  Li  sites  and  performs  screening  based  on  computed  voltage,  capacity  from  sequential  insertions  of  Li  ions  and  most  importantly,  mobility  built  upon  the  graph-based  migration  network  obtained  through  site  connectivity.  A  preliminary  application  of  the  pipeline  was  carried  out  on  a  subset  of  the  Materials  Project  database,  and  one  particular  polymorph  of  MnP2O7  is  shown  here  as  an  an  example  of  a  new  candidate  compound  which  completed  the  pipeline  and  was  selected  for  further,  detailed  analysis.  The  compound  is  shown  to  present  a  2D  ion  migration  topology,  consisting  of  two  separate  intercalation  pathways  where  the  corresponding  energy  landscapes  are  calculated  with  the  nudged-elastic  band  formalism.  Acceptable  energy  barriers  are  found  in  the  dilute  (highly  charged)  limit,  however  the  material  is  expected  to  exhibit  slower  kinetics  in  the  vacancy  (highly  discharged)  limit.Furthermore,  a  set  of  design  principles  are  derived  from  data  mining  on  voltage  information  from  two  classes  of  Li-ion  battery  cathodes.  Most  of  Li-free  cathodes  are  natively  found  in  their  charged  state,  in  contrast  to  today's  commercial  lithium-ion  battery  cathodes,  which  are  more  stable  in  their  discharged  state.  In  this  work,  calculated  cathode  voltage  information  from  both  categories  of  cathode  materials  are  combined,  covering  5577  and  2423  total  unique  structure  pairs,  respectively.  The  resulting  voltage  distributions  with  respect  to  the  redox  pairs  and  anion  types  for  both  classes  of  compounds  emphasize  design  principles  for  high-voltage  cathodes,  which  favor  later  Period  4  transition  metals  in  their  higher  oxidation  states  and  more  electronegative  anions  like  fluorine  or  polyanion  groups.  Generally,  cathodes  that  are  found  in  their  charged,  delithiated  state  are  shown  to  exhibit  voltages  lower  than  those  that  are  most  stable  in  their  lithiated  state,  in  agreement  with  thermodynamic  expectations.  Deviations  from  this  trend  are  found  to  originate  from  different  anion  distributions  between  redox  pairs.Lastly,  a  machine  learning  model  for  voltage  prediction  based  on  chemical  formulae  is  trained  on  the  data  set  obtained  from  the  voltage  distribution.  This  model  displays  sound  connections  to  physical  characteristics  that  impact  cathode  voltage  and  shows  state-of-the-art  performance  when  compared  to  two  established  composition-based  ML  models  for  materials  properties  predictions,  Roost  and  CrabNet.  The  screening  workflow,  chemical  design  principles  and  the  machine  learning  voltage  model  together  compose  a  data-driven  methodology  for  effectively  executing  high  throughput  materials  discovery  for  practical  and  high-performance  next-gen  non-Li-containing  cathodes.
■590    ▼aSchool  code:  0028.
■650  4▼aMaterials  science
■650  4▼aEngineering
■650  4▼aPhysical  chemistry
■650  4▼aComputational  physics
■653    ▼aLi-metal  anodes
■653    ▼aLi-ion  battery  cathodes
■653    ▼aMachine  learning
■653    ▼aPolyanion  groups
■653    ▼aCrabNet
■690    ▼a0794
■690    ▼a0537
■690    ▼a0216
■690    ▼a0494
■71020▼aUniversity  of  California,  Berkeley▼bMaterials  Science  &  Engineering.
■7730  ▼tDissertations  Abstracts  International▼g87-01B.
■790    ▼a0028
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357636▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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