Facile Synthesis of Ant-Nest-Like Porous Duplex Copper as Deeply Cycling Host for Lithium Metal Anodes

Kui Lin, Tong Li, Sum Wai Chiang, Ming Liu, Xianying Qin, Xiaofu Xu, Lihan Zhang, Feiyu Kang, Guohua Chen, Baohua Li

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Suppressing the dendrite formation and managing the volume change of lithium (Li) metal anode have been global challenges in the lithium batteries community. Herein, a duplex copper (Cu) foil with an ant-nest-like network and a dense substrate is reported for an ultrastable Li metal anode. The duplex Cu is fabricated by sulfurization of thick Cu foil with a subsequent skeleton self-welding procedure. Uniform Li deposition is achieved by the 3D interconnected architecture and lithiophilic surface of self-welded Cu skeleton. The sufficient space in the porous layer enables a large areal capacity for Li and significantly improves the electrode–electrolyte interface. Simulations reveal that the structure allows proper electric field penetration into the connected tunnels. The assembled Li anodes exhibit high coulombic efficiency (97.3% over 300 cycles) and long lifespan (>880 h) at a current density of 1 mA cm−2 with a capacity of 1 mAh cm−2. Stable and deep cycling can be maintained up to 50 times at a high capacity of 10 mAh cm−2.

Original languageEnglish
Article number2001784
Number of pages14
JournalSmall
Volume16
Issue number37
DOIs
Publication statusPublished - 2020

Keywords

  • deeply discharge/charge
  • duplex Cu networks
  • high areal capacity
  • lithium metal anodes
  • sulfur-assisted formation

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