材料科学
阴极
电化学
复合数
化学工程
钠
插层(化学)
储能
导电体
纳米颗粒
钠离子电池
纳米技术
复合材料
无机化学
冶金
电极
物理化学
法拉第效率
功率(物理)
化学
工程类
物理
量子力学
作者
Guijia Cui,Qingyu Dong,Zhuangzhou Wang,Xiao‐Zhen Liao,Siqi Yuan,Meidan Jiang,Yanbin Shen,Hong Wang,Haiying Che,Yu‐Shi He,Zhenqiang Ma
出处
期刊:Nano Energy
[Elsevier]
日期:2021-11-01
卷期号:89: 106462-106462
被引量:38
标识
DOI:10.1016/j.nanoen.2021.106462
摘要
NASICON-type (Na super ionic conductor) Na4VMn(PO4)3 (NVMP) cathode material has attracted increasing attention due to its higher sodium de-/intercalation voltage, lower cost and greener resources compared with Na3V2(PO4)3. However, the poor electronic conductivity limits the exploitation of its electrochemical performance. In this work, we achieved an ultrahigh rate capable and long cycle life NVMP/C-rGO composite using the simple and scalable spray-drying technique, in which low-fraction rGO nanosheets (2.14 wt%) highly dispersed and bridged the carbon shelled NVMP nanoparticles to form an effective electron conductive network. Benefiting from this favorable nano-architecture, the elaborately designed NVMP/C-rGO composite exhibited excellent performance as cathode in sodium ion batteries, delivering reversible capacities of 105.5 mA h g−1 at 1 C (1 C = 110 mA h g−1) and 102.6 mA h g−1 at 50 C with capacity retention of 90.6% (1 C) and 80.4% (50 C) over 500 cycles, respectively. This is the highest rate performance for Na4VMn(PO4)3 materials reported so far. This work provides a practicable tactic for fabricating advanced polyanion-type cathode materials which can be commercially scale up for sodium energy storage.
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