Sodium-ion batteries stand a chance of enabling fast charging ability and long lifespan while operating at low temperature(low-T).However,sluggish kinetics and aggravated dendrites present two major challenges for anodes to achieve the goal at low-T.Herein,we propose an interlayer confined strategy for tailoring nitrogen ter-minals on Ti3C2 MXene(Ti3C2-Nfunct)to address these issues.The introduction of nitrogen terminals endows Ti3C2-Nfunct with large interlayer space and charge redistribution,improved conductivity and sufficient adsorption sites for Na+,which improves the possibility of Ti3C2 for accommodating more Na atoms,further enhancing the Na+storage capability of Ti3C2.As revealed,Ti3C2-Nfunct not only possesses a lower Na-ion diffusion energy barrier and charge trans-fer activation energy,but also exhibits Na+-solvent co-intercalation behavior to circumvent a high de-solvation energy barrier at low-T.Besides,the solid electrolyte interface dominated by inorganic com-pounds is more beneficial for the Na+transfer at the electrode/electrolyte interface.Compared with of the unmodified sample,Ti3C2-Nfunct exhibits a twofold capacity(201 mAh g-1),fast-charging ability(18 min at 80％capacity retention),and great superiority in cycle life(80.9％@5000 cycles)at-25℃.When coupling with Na3V2(PO4)2F3 cathode,the Ti3C2-Nfunct//NVPF exhibits high energy density and cycle stability at-25℃.

Yang Xia;Lanfang Que;Fuda Yu;Liang Deng;Zhenjin Liang;Yunshan Jiang;Meiyan Sun;Lei Zhao;Zhenbo Wang

MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage,State Key Lab of Urban Water Resources and Environment,School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,People's Republic of China;Engineering Research Center of Environment-Friendly Functional Materials,Ministry of Education,Institute of Materials Physical Chemistry,Huaqiao University,Xiamen 361021,People's Republic of China;The Institute for Advanced Studies,Wuhan University,Wuhan 430072,People's Republic of China;College of Materials Science and Engineering,Shenzhen University,Shenzhen 518071,People's Republic of China

纳微快报（英文）

[1]Yang Xia;Lanfang Que;Fuda Yu;Liang Deng;Zhenjin Liang;Yunshan Jiang;Meiyan Sun;Lei Zhao;Zhenbo Wang-.Tailoring Nitrogen Terminals on MXene Enables Fast Charging and Stable Cycling Na-Ion Batteries at Low Temperature)[J].纳微快报（英文）,2022(09):63-78

Nfunct,Na+transfer

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