Boosting the Sodium-Ion Transport and Surface Pseudocapacitance of a SnO2 Nanoflower at a High Mass Loading Level for High Areal Capacity and Fast Sodium-Ion Storage

Kai X. Guo, Yao H. Zhang, Qin Wang, Di W. Yu, Yan G. Zhang, Pu G. Ji, Umedjon Khalilov, Gong K. Wang, Xin Zhang, Kai Wang, Yue X. Song, Xiao B. Zhong, Hong T. Sun, Jun F. Liang

Research output: Contribution to journalReview articlepeer-review

Abstract

The exploitation of electrode materials with high areal capacity and rate performance under high mass loading is critical for the practical application of sodium-ion batteries (SIBs), and 3D nanocomposite electrode materials based on nanoelectrode materials and 3D carbon-based material frameworks have shown extraordinary promise. However, the areal capacity and rate performance are unsatisfactory because of the low utilization efficiency and sluggish Na+ kinetics of active Na+ storage materials. To address this problem, we developed a 3D SnO2 nanoflower-holey graphene (SnO2 NF-HG) composite electrode. The 3D HG framework can provide a fully interconnected hierarchical porous channel for Na+ transport to the SnO2 surface, and the flower-like SnO2 nanomaterials with larger surface area can provide more active sites for Na+ storage. The electrochemical test results indicate the low Na+ resistance and high pseudocapacitance contribution of the as-prepared 3D SnO2 NF-HG electrodes. As a result, the low utilization efficiency and sluggish Na+ kinetics of the active Na+ storage materials were substantially boosted, and the 3D composite electrodes show impressive properties of high areal capacity and fast Na+ storage. Under a high current density of 5 mA cm-2, the 3D SnO2 NF-HG composite electrodes with high mass loading of 10 mg cm-2 achieve a strikingly high and stable areal capacity of 3 mAh cm-2. This high areal capacity is the same as those of commercial lithium-ion battery electrode materials and greatly exceeds those of most reported SIB electrode materials. Our work shows that rationally designed active Na+ storage electrode materials with large surface area represent an effective strategy for promoting high-mass-loading 3D composites and high-specific-capacity electrode materials toward practical SIB applications.

Original languageEnglish (US)
JournalACS Applied Nano Materials
DOIs
StateAccepted/In press - 2023
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Materials Science

Keywords

  • 3D holey graphene
  • SnO nanoflower
  • fast sodium-ion storage
  • high areal capacity
  • high surface area

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