標題: Tuning of Na+ Concentration in an Ionic Liquid Electrolyte to Optimize Solid-Electrolyte Interphase at Microplasma-Synthesized Graphene Anode for Na-Ion Batteries
作者: Luo, Xu-Feng
Chiang, Wei-Hung
Su, Ching-Yuan
Wu, Tzi-Yi
Majumder, S. B.
Chang, Jeng-Kuei
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: 2D materials;electrolyte composition;charge-discharge properties;thermal stability;solid-electrolyte interphase
公開日期: 7-十月-2019
摘要: Two-dimensional (2D) materials are promising anodes for Na-ion batteries owing to their unique architectures and tunable physiochemical properties. However, their high surface area requires sophisticated electrolyte/electrode interface control to improve the charge-discharge efficiency and reversibility. This study uses microplasma-synthesized graphene nanosheets (MPGNSs) as a model 2D material. The effects of NaFSI concentration in an N-propyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide ionic liquid (IL) electrolyte are systematically investigated. It is found that the chemical composition of the solid-electrolyte interphase depends on the electrolyte formulation, leading to distinct Coulombic efficiency, discharge capacity, rate capability, and cyclability of the MPGNS electrodes. The thermal reactivity of the sodiated MPGNSs (in terms of exothermic onset temperature and total heat released) upon heating is studied using differential scanning calorimetry. The IL electrolyte with a proper Na+ fraction is superior to a conventional organic carbonate electrolyte for practical NIB applications.
URI: http://dx.doi.org/10.1021/acssuschemeng.9b04091
http://hdl.handle.net/11536/153012
ISSN: 2168-0485
DOI: 10.1021/acssuschemeng.9b04091
期刊: ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume: 7
Issue: 19
起始頁: 16682
結束頁: 16689
顯示於類別:期刊論文