Tailoring a Phenolic Resin Precursor by Facile Pre-oxidation Tactics to Realize a High-Initial-Coulombic-Efficiency Hard Carbon Anode for Sodium-Ion Batteries

• DOI: 10.1021/acsami.1c06168
• Publication Date: 2021-06-30T10:06:49Z
• Authors: Guifang Zhang; Lijun Zhang; Qingjuan Ren; Lei Yan; Fuming Zhang; Wenjie Lv; Zhiqiang Shi
• Keywords: Carbon fibers; Specific surface area

As the leading anode material for sodium-ion batteries (SIBs), hard carbon (HC) still faces puzzle of low initial Coulombic efficiency (ICE) in achieving commercialization. From perspective precursors, ICE has been attributed to large specific surface area and porosity produced by rapid decomposition polymers during carbonization. Therefore, increasing cross-linking degree precursors will be an effective shortcut improve ICE. Herein, a facile pre-oxidation tactic was successfully employed tailor phenolic resin precisely control obtained HC. time is increased, optimal HC with lowest shows elevated 22.2% (from 62.5 84.7%) compared original delivers high reversible capacity 334.3 mAh g–1 at 20 mA g–1. Besides, also introduces abundant carbonyl groups, which increase disorder supply adsorption sites Na+, thus enhancing rate performance. When matched layered O3-NaNi1/3Fe1/3Mn1/3O2 cathode, full cell achieves energy density ca. 256.2 Wh kg–1 superior This work sheds light on positive effect elevating provides guidance achieve other materials.