Elucidation of the Sodium‐Storage Mechanism in Hard Carbons

• DOI: 10.1002/aenm.201703217
• Publication Date: 2018-02-12T07:08:43Z
• Authors: Panxing Bai; Yongwu He; Xiaoxi Zou; Xinxin Zhao; Peixun Xiong; Yunhua Xu
• Keywords: Heteroatom; Nanopore

Abstract Hard carbons (HCs) are the most promising candidate anode materials for emerging Na‐ion batteries (NIBs). HCs composed of misaligned graphene sheets with plentiful nanopores and defects, imparting a complex correlation between its structure sodium‐storage behavior. The currently debated mechanism Na + ‐ion insertion in hinders development high‐performance NIBs. In this article, ingenious reliable strategies used to elaborate electrochemical performance further illuminate HCs. First, filling sulfur into micropores can remove low‐voltage plateau, providing solid evidence association pore‐filling mechanism. Along decreased concentration defects/heteroatoms at higher treatment temperature, reduced sloping capacity confirms adsorption region. Finally, similar sodium‐insertion behaviors ether‐based ester‐based electrolytes indicate that no ions intercalate layers. determined adsorption‐pore‐filling encourages design more efficient HC high high‐energy