Electrolyte design for LiF-rich solid–electrolyte interfaces to enable high-performance microsized alloy anodes for batteries

Ji Chen, Xiulin Fan, Qin Li, Hongbin Yang, M. Reza Khoshi, Yaobin Xu, Sooyeon Hwang, Long Chen, Xiao Ji, Chongyin Yang, Huixin He, Chongmin Wang, Eric Garfunkel, Dong Su, Oleg Borodin, Chunsheng Wang

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Lithium batteries with Si, Al or Bi microsized (>10 µm) particle anodes promise a high capacity, ease of production, low cost and low environmental impact, yet they suffer from fast degradation and a low Coulombic efficiency. Here we demonstrate that a rationally designed electrolyte (2.0 M LiPF6 in 1:1 v/v mixture of tetrahydrofuran and 2-methyltetrahydrofuran) enables 100 cycles of full cells that contain microsized Si, Al and Bi anodes with commercial LiFePO4 and LiNi0.8Co0.15Al0.05O2 cathodes. Alloy anodes with areal capacities of more than 2.5 mAh cm−2 achieved >300 cycles with a high initial Coulombic efficiency of >90% and average Coulombic efficiency of >99.9%. These improvements are facilitated by the formation of a high-modulus LiF–organic bilayer interphase, in which LiF possesses a high interfacial energy with the alloy anode to accommodate plastic deformation of the lithiated alloy during cycling. This work provides a simple yet practical solution to current battery technology without any binder modification or special fabrication methods.

Original languageEnglish
Pages (from-to)386-397
Number of pages12
JournalNature Energy
Volume5
Issue number5
DOIs
Publication statusPublished - May 1 2020

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology

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