Modulating the defects of graphene blocks by ball-milling for ultrahigh gravimetric and volumetric performance and fast sodium storage

Yue Dong, Xieji Lin, Dengke Wang, Renlu Yuan, Su Zhang, Xiaohong Chen, Lyubov G. Bulusheva, Alexander V. Okotrub, Huaihe Song

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Dense carbon materials with fast sodium storage performance are strongly desired for developing high-energy and high-power devices, but remain challenging because of the sluggish Na+ transport kinetics. Herein, we report that the defect density and sp2 cluster size of dense graphene blocks (DGB) can be elaborately modulated by ball-milling to achieve both high gravimetric and volumetric capacities and outstanding rate performance for Na+ storage. The loose graphene flakes are cut into small platelets with enriched defects and simultaneously densified by mechanical forces, leading to abundant active sites for Na+ storage, controlled sp2 size as conductive networks, and large interlayer spacing for fast Na+ transport. The DGB performs a novel capacitive Na+ storage with high capacities of 507 mAh g−1 and 397 mAh cm−3 at 50 ​mA ​g−1, and an ultrahigh rate of 181 mAh g−1 at 10 ​A ​g−1. It also shows a remarkable cycle stability due to the strongly-coupled layer structure. The comprehensive performance is superior to most of the reported carbons. The Na-ion capacitor delivers an ultrahigh energy density of 45 ​Wh kg−1 even at 14,205 ​W ​kg−1. Our work broadens the avenue for preparing advanced carbon materials for compact Na+ storage.

Original languageEnglish
Pages (from-to)287-295
Number of pages9
JournalEnergy Storage Materials
Volume30
DOIs
Publication statusPublished - 1 Sep 2020

Keywords

  • Capacitive sodium storage
  • Dense graphene blocks
  • Interlayer spacing
  • Sodium-ion capacitor
  • sp cluster size
  • ION BATTERIES
  • sp(2) cluster size
  • ANODE MATERIAL
  • CYCLE LIFE
  • CARBON NANOSHEETS
  • GRAPHITE
  • INTERCALATION
  • NA
  • RATE CAPABILITY
  • ELECTROCHEMICAL ENERGY-STORAGE
  • LITHIUM

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