Lithium–matrix composite anode protected by a solid electrolyte layer for stable lithium metal batteries

Xin Shen, Xinbing Cheng, Peng Shi, Jiaqi Huang*, Xueqiang Zhang, Chong Yan, Tao Li, Qiang Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

238 Citations (Scopus)

Abstract

Lithium (Li) metal with an ultrahigh specific theoretical capacity and the lowest reduction potential is strongly considered as a promising anode for high-energy-density batteries. However, uncontrolled lithium dendrites and infinite volume change during repeated plating/stripping cycles hinder its practical applications immensely. Herein, a house-like Li anode (housed Li) was designed to circumvent the above issues. The house matrix was composed of carbon fiber matrix and affords a stable structure to relieve the volume change. An artificial solid electrolyte layer was formed on composite Li metal, just like the roof of a house, which facilitates uniform Li ions diffusion and serves as a physical barrier against electrolyte corrosion. With the combination of solid electrolyte layer and matrix in the composite Li metal anode, both dendrite growth and volume expansion are remarkably inhibited. The housed Li | LiFePO4 batteries exhibited over 95% capacity retention after 500 cycles at 1.0 C in coin cell and 85% capacity retention after 80 cycles at 0.5 C in pouch cell. The rationally combination of solid electrolyte layer protection and housed framework in one Li metal anode sheds fresh insights on the design principle of a safe and long-lifespan Li metal anode for Li metal batteries.

Original languageEnglish
Pages (from-to)29-34
Number of pages6
JournalJournal of Energy Chemistry
Volume37
DOIs
Publication statusPublished - Oct 2019

Keywords

  • Composite electrode
  • Lithium metal anode
  • Lithium metal dendrites
  • Rechargeable batteries
  • Solid electrolyte layer

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