首页|Ultra-stable carbon-coated sodium vanadium phosphate as cathode material for sodium-ion battery

Ultra-stable carbon-coated sodium vanadium phosphate as cathode material for sodium-ion battery

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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.

Na3V2(PO4)3Sodium superionic conductor structuresBall-millingCathodeSodium-ion battery

Di Wang、Peng Cai、Guo-Qiang Zou、Hong-Shuai Hou、Xiao-Bo Ji、Ye Tian、Zhen Long

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Tianjin Key Laboratory of Functional Crystal Materials,Institute of Functional Crystal,Tianjin University of Technology,Tianjin 300384,China

College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China

National Key Research and Development Program of ChinaMajor Program of the National Natural Science Foundation of ChinaState Key Program of National Natural Science of China

2017YFB01020005189086561835014

2022

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDCSCDSCIEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2022.41(1)
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