阳极
结构精修
材料科学
兴奋剂
离子
阴极
钠离子电池
钠
化学工程
分析化学(期刊)
晶体结构
化学
电极
物理化学
结晶学
冶金
有机化学
法拉第效率
光电子学
色谱法
工程类
作者
Boyu Xing,Jingke Ren,Ping Hu,Wen Luo,Bo Mai,Hongwei Cai,Jiahao Wu,Xinfei Wu,Xingbao Chen,Zixin Deng,Wencong Feng,Liqiang Mai
出处
期刊:Small
[Wiley]
日期:2024-02-14
标识
DOI:10.1002/smll.202310997
摘要
Sodium-ion batteries (SIBs) are potential candidates for large energy storage usage because of the natural abundance and cheap sodium. Nevertheless, improving the energy density and cycling steadiness of SIB cathodes remains a challenge. In this work, F-doping Na3 Al2/3 V4/3 (PO4 )3 (NAVP) microspheres (Na3 Al2/3 V4/3 (PO4 )2.9 F0.3 (NAVPF)) are synthesized via spray drying and investigated as SIB cathodes. XRD and Rietveld refinement reveal expanded lattice parameters for NAVPF compared to the undoped sample, and the successful cation doping into the Na superionic conductor (NASICON) framework improves Na+ diffusion channels. The NAVPF delivers an ultrahigh capacity of 148 mAh g-1 at 100 mA g-1 with 90.8% retention after 200 cycles, enabled by the activation of V2+ /V5+ multielectron reaction. Notably, NAVPF delivers an ultrahigh rate performance, with a discharge capacity of 83.6 mAh g-1 at 5000 mA g-1 . In situ XRD demonstrates solid-solution reactions occurred during charge-discharge of NAVPF without two-phase reactions, indicating enhanced structural stability after F-doped. The full cell with NAVPF cathode and Na+ preintercalated hard carbon anode shows a large discharge capacity of 100 mAh g-1 at 100 mA g-1 with 80.2% retention after 100 cycles. This anion doping strategy creates a promising SIB cathode candidate for future high-energy-density energy storage applications.
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