Hard Carbon Anodes for Na‐Ion Batteries: Toward a Practical Use

• DOI: 10.1002/celc.201500412
• Publication Date: 2015-09-30T08:15:41Z
• Authors: George Hasegawa; Kazuyoshi Kanamori; Naokatsu Kannari; Jun‐ichi Ozaki; Kazuki Nakanishi; Takeshi Abe
• Keywords: Carbon fibers; Cell voltage

Abstract Hard carbons have immense potential as anode materials for Na‐ion batteries, because the expanded graphene interlayers and nanovoids between randomly stacked aromatic fragments can accommodate a substantial amount of sodium. However, large irreversible capacity in first cycle still remains significant issue terms practicable battery technology. Here, we show that hard carbon electrodes derived from common phenol resin deliver high reversible within narrow range 0.1–0.005 V (vs. Na + /Na) an excellent initial coulombic efficiency up to 95 %. The former allows sustainable voltage, whereas latter minimizes unavailable closed cell. findings this work put forward guideline manufacturing electrodes, which goes against current trend nanostructuring downsizing.