Low-Surface-Area Hard Carbon Anode for Na-Ion Batteries via Graphene Oxide as a Dehydration Agent

Autor:	Zelang Jian, Wei Luo, Xin Li, Yuhao Lu, Clement Bommier, Xiulei Ji, Jong Jan Lee, Rich G. Carter, Sean Vail
Rok vydání:	2015
Předmět:	Materials science Graphene Oxide chemistry.chemical_element Nanotechnology Energy storage law.invention Anode chemistry.chemical_compound chemistry law Specific surface area General Materials Science Carbon Pyrolysis Faraday efficiency
Zdroj:	ACS Applied Materials & Interfaces. 7:2626-2631
ISSN:	1944-8252 1944-8244
DOI:	10.1021/am507679x
Popis:	Na-ion batteries are emerging as one of the most promising energy storage technologies, particularly for grid-level applications. Among anode candidate materials, hard carbon is very attractive due to its high capacity and low cost. However, hard carbon anodes often suffer a low first-cycle Coulombic efficiency and fast capacity fading. In this study, we discover that doping graphene oxide into sucrose, the precursor for hard carbon, can effectively reduce the specific surface area of hard carbon to as low as 5.4 m(2)/g. We further reveal that such doping can effectively prevent foaming during caramelization of sucrose and extend the pyrolysis burnoff of sucrose caramel over a wider temperature range. The obtained low-surface-area hard carbon greatly improves the first-cycle Coulombic efficiency from 74% to 83% and delivers a very stable cyclic life with 95% of capacity retention after 200 cycles.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6519e76d8faec45189ed5dea2ee03299 https://doi.org/10.1021/am507679x Zobrazit plný text záznamu