首页|Boosting sodium-storage properties of hierarchical Na3V2(PO4)3@C micro-flower cathodes by tiny Cr doping:The effect of"four ounces moving a thousand pounds"

Boosting sodium-storage properties of hierarchical Na3V2(PO4)3@C micro-flower cathodes by tiny Cr doping:The effect of"four ounces moving a thousand pounds"

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Na3V2(PO4)3(NVP),as a great potential cathode candidate for Na-ion batteries(NIBs),has attracted enormous interest due to its three-dimensional(3D)large open framework for convenient Na+transport,yet its practical application is still limited by its inferior electron conductivity and sluggish Na+diffusion kinetics.Herein,the tiny Cr doped hierarchical NVP micro-flower cathodes(i.e.,Na3V2-xCrx(PO4)3@C,x ≤ 0.1),which are self-assembled with single-crystal nanoflake subunits in-situ coated with carbon nano-shell,are designed and fabricated via a scalable avenue.The optimized cathode,i.e.,Na3V1.94Cr0.06(PO4)3@C(NVCP-6),was endowed with more electro-active Na(2)sites and higher electronic/ionic conductivity for efficient sodium storage.Benefiting from these competitive merits,the NVCP-6,when evaluated as a cathode towards NIBs,exhibits an ultrahigh-rate capability of 99.8 mAh·g-1 at 200 C and superior stability of 82.2％over 7300 cycles at 50 C.Furthermore,the NVCP-6 based full NIBs display remarkable electrochemical properties in terms of both high-rate capacities and long-duration cycling properties at different temperatures(-20-50 ℃).The contribution,i.e.,the design of"four ounces can move a thousand pounds",here will promote the practical industrial application of NVP towards advanced NIBs.

Na3V2(PO4)3 cathodetiny Cr dopingactive Na sitesultrahigh-rate capabilityNa-ion batteries

Yongjia Wang、Guoshuai Su、Xiaoying Li、Linrui Hou、Longwei Liang、Changzhou Yuan

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School of Materials Science & Engineering,University of Jinan,Jinan 250022,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaTaishan ScholarsJinan Independent Innovative TeamMajor Program of Shandong Province Natural Science Foundation

51904115520721515217121152271218U22A20145ts2017120502020GXRC015ZR2021ZD05

2024

10.1007/s12274-023-5555-8

纳米研究(英文版)

纳米研究(英文版)

CSTPCD
ISSN：
年,卷(期)：2024.17(1)
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