Doping-template approach of porous-walled graphitic nanocages for superior performance anodes of lithium ion batteries. Issue 67 (30th August 2017)

• Record Type: Journal Article
• Authors: Sheng, Zhao Min; Chang, Xin Jian; Chen, Yu Hang; Hong, Cheng Yang; Li, Na Na; Chang, Cheng Kang; Jia, Run Ping; Han, Sheng
• Is Part Of: RSC advances. Volume 7:Issue 67(2017)
• Page Start: 42083
• Page End: 42087
• Publication Date: 2017-08-30
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7ra07859e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Removal of the N-doped template creates nanopores in the shells of nanocages. The created nanopores enhance fast ion diffusion. Abstract : In a template approach to porous-walled graphitic nanocages (PWGNC) with N-doping structure, nanopores have been equably and efficiently created in the shells of GNCs by partially removing N-doped templates, which replace some C atoms in the graphitic layers of the GNCs by in situ doping during thermal pyrolytic preparation of GNCs. Such created nanopores offer many efficient diffusion channels for fast distribution of the electrolyte and Li + (specific surface area and mesopore volume sharply rose 1100 vs. 700 m 2 g −1 ; 1.9 vs. 1 cm 3 g −1 ), leading to their hollow inner structure available even at elevated charge/discharge rates, which sharply enhances the performance of the PWGNC-based anode with charge–discharge rate increases (31% increase: 1200 vs. 917 mA h g −1 at current density of 0.2 A g −1 ; 52% increase: 510 vs. 335 mA h g −1 at 5 A g −1 ).