Lithium–Iron (III) Fluoride Battery with Double Surface Protection

Abstract

Lithium–metal fluoride batteries promise significantly higher energy density than the state‐of‐the‐art lithium‐ion batteries and lithium–sulfur batteries. Unfortunately, commercialization of metal fluoride cathodes is prevented by their high resistance, irreversible structural change, and rapid degradation. In this study, a substantial boost in metal fluoride (MF) cathode stability by designing nanostructure with two layers of protective shells—one deposited ex situ and the other in situ is demonstrated. Such methodology achieves over 90% capacity retention after 300 charge–discharge cycles, producing the first report on FeF3 as a cathode material, where a very high capacity utilization in combination with excellent stability is approaching the level needed for practical applications of FeF3. The cathode solid electrolyte interphase (CEI) containing lithium oxalate and BF bond containing anions is found to effectively protect the cathode material from direct contact with electrolytes, thus greatly suppressing the dissolution of Fe. Quantum chemistry and molecular dynamics calculations provide unique insights into the mechanisms of CEI layer formation. As a result, this work not only demonstrates unprecedented performance, but also provides the reader with a better fundamental understanding of electrochemical behavior of MF cathodes and the positive impact observed with the application of a lithium bis(oxalato)borate salt in the electrolyte.

Document Details

Document Type
Pub Defense Publication
Publication Date
Jul 18, 2018
Source ID
10.1002/aenm.201800721

Entities

People

  • Alexandre Magasinski
  • Danni Lei
  • Enbo Zhao
  • Gleb Yushin
  • Kostiantyn Turcheniuk
  • Oleg Borodin
  • Wenbin Fu
  • Xiaolei Ren
  • Xiaosi Gao
  • Yiran Xiao

Organizations

  • Army Research Office
  • Chongqing University
  • Georgia Tech
  • Lanzhou University
  • National Aeronautics and Space Administration
  • Tsinghua University
  • United States Army Research Laboratory
  • United States Department of Energy

Tags

Fields of Study

  • Materials science

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.
  • Software Engineering

Technology Areas

  • Microelectronics
  • Quantum Computing