Nano-Cone Structured Lithiophilic Ni Film on Cu Current Collector Facilitates Li+ Ion Diffusion Toward Uniform Lithium Deposition

Wang Hu, Yongchao Rao, Peixin Chen, Shenghong Ju, Huiqin Ling, Yunwen Wu*, Toshiyuki Momma, Ming Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The uncontrolled growth of lithium (Li) dendrite during long-term cycling has hindered the practical application of the Li metal anode in the next generation rechargeable batteries. A variety of nanostructured current collectors is proposed in Li metal anode to reduce local current density and thus mitigate the Li dendrite formation. Here, the Ni nano-cone@Al (NCA) structure is utilized to guide the uniform metallic Li nucleation and growth, free from the dendrites. This unique nano-cone structure can facilitate the ion diffusion toward the bottom of the Ni nanostructures to make effective use of the nano-cone structure. The surface lithiophilicity is revealed from the view of absorption energy and interface lattice mismatch. It is found that Al on nano-cone Ni surface decreases the elastic strain energy at the interface rather than decreasing the formation energy. The resulting NCA structured substrate possesses small Li nucleation overpotentials (<0.032 V) and good structural stability upon galvanostatic cycling. Superior cycling stability over 2000 h in a Li|Li symmetric cell is realized. Full cell by paring with LiFePO4 achieves a high coulombic efficiency of 98.1% for over 100 cycles at 0.2 C with a capacity retention of over 97.2%.

Original languageEnglish
Article number2200129
JournalAdvanced Materials Interfaces
Volume9
Issue number15
DOIs
Publication statusPublished - 2022 May 23

Keywords

  • Li nucleation
  • Ni nano-cone
  • absorption energy
  • interface lattice mismatch
  • lithiophilic layer
  • lithium metal anode

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering

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