Atomic Layer Deposition of Stable LiAlF4 Lithium Ion Conductive Interfacial Layer for Stable Cathode Cycling

Jin Xie, Austin D. Sendek, Ekin D. Cubuk, Xiaokun Zhang, Zhiyi Lu, Yongji Gong, Tong Wu, Feifei Shi, Wei Liu, Evan J. Reed, Yi Cui

Research output: Contribution to journalArticlepeer-review

139 Scopus citations

Abstract

Modern lithium ion batteries are often desired to operate at a wide electrochemical window to maximize energy densities. While pushing the limit of cutoff potentials allows batteries to provide greater energy densities with enhanced specific capacities and higher voltage outputs, it raises key challenges with thermodynamic and kinetic stability in the battery. This is especially true for layered lithium transition-metal oxides, where capacities can improve but stabilities are compromised as wider electrochemical windows are applied. To overcome the above-mentioned challenges, we used atomic layer deposition to develop a LiAlF4 solid thin film with robust stability and satisfactory ion conductivity, which is superior to commonly used LiF and AlF3. With a predicted stable electrochemical window of approximately 2.0 ± 0.9 to 5.7 ± 0.7 V vs Li+/Li for LiAlF4, excellent stability was achieved for high Ni content LiNi0.8Mn0.1Co0.1O2 electrodes with LiAlF4 interfacial layer at a wide electrochemical window of 2.75-4.50 V vs Li+/Li.

Original languageEnglish (US)
Pages (from-to)7019-7027
Number of pages9
JournalACS nano
Volume11
Issue number7
DOIs
StatePublished - Jul 25 2017

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Atomic Layer Deposition of Stable LiAlF<sub>4</sub> Lithium Ion Conductive Interfacial Layer for Stable Cathode Cycling'. Together they form a unique fingerprint.

Cite this