Superior Sodium Storage in 3D Interconnected Nitrogen and Oxygen Dual-Doped Carbon Network

• Published in: Small (Weinheim an der Bergstrasse, Germany) Germany), 2016-05, Vol.12 (19), p.2559-2566
• Main Authors: Wang, Min, Yang, Zhenzhong, Li, Weihan, Gu, Lin, Yu, Yan
• Format: Article
• Language: English
• Subjects: Activation; anode; Bacteria; Carbon; carbon networks; Carbonaceous materials; carbonaceous materials, carbon networks; hard carbon; Na-ion batteries; Nanotechnology; Networks; Oxygen; Sodium; Three dimensional
• ISSN: 1613-6810; 1613-6829
• DOI: 10.1002/smll.201600101

Carbonaceous materials have attracted immense interest as anode materials for Na‐ion batteries (NIBs) because of their good chemical, thermal stabilities, as well as high Na‐storage capacity. However, the carbonaceous materials as anodes for NIBs still suffer from the lower rate capability and poor cycle life. An N,O‐dual doped carbon (denoted as NOC) network is designed and synthesized, which is greatly favorable for sodium storage. It exhibits high specific capacity and ultralong cycling stability, delivering a capacity of 545 mAh g−1 at 100 mA g−1 after 100 cycles and retaining a capacity of 240 mAh g−1 at 2 A g−1 after 2000 cycles. The NOC composite with 3D well‐defined porosity and N,O‐dual doped induces active sites, contributing to the enhanced sodium storage. In addition, the NOC is synthesized through a facile solution process, which can be easily extended to the preparation of many other N,O‐dual doped carbonaceous materials for wide applications in catalysis, energy storage, and solar cells. A nitrogen and oxygen dual‐doped carbon (NOC) network film is prepared via chemical activation of the bacterial cellulose derived carbon with activation of KOH. The NOC film with 3D well‐defined porosity and N,O‐dual doped carbon induces active sites, which leads to improved sodium storage capacity and stability (240 mAh g−1 at 2 A g−1 after 2000 cycles).