Coupled Carbonization Strategy toward Advanced Hard Carbon for High-Energy Sodium-Ion Battery

• DOI: 10.1021/acsami.7b05687
• Publication Date: 2017-06-26T14:41:49Z
• Authors: Huimin Zhang; Hai Ming; Wenfeng Zhang; Gaoping Cao; Yusheng Yang
• Keywords: Carbon fibers

Sodium-ion batteries (SIBs) are expected to be a promising commercial alternative lithium-ion for grid electricity storage due their potential low cost in the near future. Up present, anode material still remains great challenge application of SIBs, especially at room temperature. Graphite has an obvious limitation store larger radius sodium ions (Na+) comparison with lithium (Li+), while hard carbon large interlayer distance can demonstrate relatively high capability and durable cycle life. However, disadvantages initial Coulombic efficiency (ICE) mainly caused by surface area synthetic approach hinder its practical applications. Herein, new coupled carbonization strategy is presented prepare cost-effective pyrolyzing carbonizing mixture abundant sucrose phenolic resin. Benefiting from specialized pyrolysis reaction process optimized conditions as studied detail, extremely 1.54 m2 g-1 87%, which have been rarely reported before enhance utilization Na+ consumption within cathode More importantly, carbon, 3.95 Å, deliver higher capacity 319 mAh maintain finer retention 90% over 150 cycles. Besides, full cell configuration as-prepared versus air-stable O3-Na0.9[Cu0.22Fe0.30Mn0.48]O2 further presented, it ICE 80% energy density 256 Wh kganode-1 (vs carbon) reliable performance. The results that our feasible extendable, tunable carbon-based materials should wider applications addition attractive properties Na-ion batteries.