Controlled Nitrogen Doping in Crumpled Graphene for Improved Alkali Metal-Ion Storage under Low-Temperature Conditions

Kyungbin Lee, Michael J. Lee, Jeonghoon Lim, Kun Ryu, Mochen Li, Suguru Noda, Seok Joon Kwon*, Seung Woo Lee*

*この研究の対応する著者

研究成果: Article査読

8 被引用数 (Scopus)

抄録

The significant performance decay in conventional graphite anodes under low-temperature conditions is attributed to the slow diffusion of alkali metal ions, requiring new strategies to enhance the charge storage kinetics at low temperatures. Here, nitrogen (N)-doped defective crumpled graphene (NCG) is employed as a promising anode to enable stable low-temperature operation of alkali metal-ion storage by exploiting the surface-controlled charge storage mechanisms. At a low temperature of −40 °C, the NCG anodes maintain high capacities of ≈172 mAh g−1 for lithium (Li)-ion, ≈107 mAh g−1 for sodium (Na)-ion, and ≈118 mAh g−1 for potassium (K)-ion at 0.01 A g−1 with outstanding rate-capability and cycling stability. A combination of density functional theory (DFT) and electrochemical analysis further reveals the role of the N-functional groups and defect sites in improving the utilization of the surface-controlled charge storage mechanisms. In addition, the full cell with the NCG anode and a LiFePO4 cathode shows a high capacity of ≈73 mAh g−1 at 0.5 °C even at −40 °C. The results highlight the importance of utilizing the surface-controlled charge storage mechanisms with controlled defect structures and functional groups on the carbon surface to improve the charge storage performance of alkali metal-ion under low-temperature conditions.

本文言語English
論文番号2209775
ジャーナルAdvanced Functional Materials
33
2
DOI
出版ステータスPublished - 2023 1月 10

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 化学 (全般)
  • 材料科学(全般)
  • 電気化学
  • 生体材料

フィンガープリント

「Controlled Nitrogen Doping in Crumpled Graphene for Improved Alkali Metal-Ion Storage under Low-Temperature Conditions」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル