Dendrite-free lithium deposition enabled by a vertically aligned graphene pillar architecture

Kui Lin, Xiaofu Xu, Xianying Qin, Shuwei Wang, Cuiping Han, Huanran Geng, Xiaojing Li, Feiyu Kang, Guohua Chen, Baohua Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Uncontrollable dendrite growth and poor reversibility of lithium (Li) metal anode hinder the practical implementation of Li metal based batteries. Herein, we report a feasible and scalable electrospraying strategy for fabricating a vertically aligned graphene (VAG) pillar architecture with low tortuosity and high specific surface area as both current collector and host material for Li metal anode. Columnar and dense Li with large granular size plates into the VAG electrode by the aid of the pillar structure, which could ensure continuous ion transfer and lower actual current density for uniform nucleation, as well as provide more accommodation with proper space size. The hollow graphene pillars and the surrounding sufficient space enables smooth Li plating under high capacity depth and abstains volume fluctuation of the whole electrode. The VAG pillar modified Li anode delivers low overpotential of 25 mV over 280 h under a high rate of 3 mA cm−2, and high Coulombic efficiencies for 250 cycles at a capacity of 1 mAh cm−2. More importantly, full cells paired with the high capacity LiFePO4 cathode exhibit excellent cycling stability and rate capability, demonstrating the high Li utilization efficiency and improved ion migration kinetic in the low tortuous VAG architecture.

Original languageEnglish
Pages (from-to)152-160
Number of pages9
JournalCarbon
Volume185
DOIs
Publication statusPublished - 15 Nov 2021

Keywords

  • Dendrite-free
  • Electrospray
  • Graphene pillar
  • Lithium metal anode
  • Low tortuosity

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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