【摘 要】
：
Based on the excellent sodium ion mobility of sodium superionic conductor structures,Na3V2(PO4)3 materials have become promising cathode materials in sodium-ion batteries (SIBs).However,inadequate elec-tronic transport of Na3V2(PO4)3 limits the cycling st
【机 构】
：
Tianjin Key Laboratory of Functional Crystal Materials,Institute of Functional Crystal,Tianjin Unive
论文部分内容阅读
Based on the excellent sodium ion mobility of sodium superionic conductor structures,Na3V2(PO4)3 materials have become promising cathode materials in sodium-ion batteries (SIBs).However,inadequate elec-tronic transport of Na3V2(PO4)3 limits the cycling stability and rate performances in SIBs.In this work,high-perfor-mance conductive carbon-coated Na3V2(PO4)3 materials are obtained via a simple and facile ball-milling assisted solid-state method by utilizing citric acid as carbon sour-ces.The carbon-coated composite electrodes display a high initial specific capacity of 111.6 mAh·g-1,and the specific capacity could retention reach 92.83％ after 100 cycles at 1C with the high coulombic efficiency (99.95％).More importantly,the capacity of conductive carbon-coated nano-sized Na3V2(PO4)3 can remain 48.5 mAh·g-1 at 10C after 3000 cycles (initial capacity of 101.2 mAh·g-1).At the same time,high coulombic efficiency (near 100％) has little decay even at a high rate of 20C during 1000 cycles,demonstrating the excellent cycling stability and remark-able rate performances,and showing potential in large-scale productions and applications.
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