Topological proton regulation of interlayered local structure in sodium titanite for wide-temperature sodium storage  

作　　者：Ru-Ning Tian Siwei Zhao Zhuoran Lv Guozhong Lu Mengnuo Fu Jingjing Chen Dajian Wang Chenlong Dong Zhiyong Mao 

机构地区：[1]Tianjin Key Laboratory for Photoelectric Materials and Devices,School of Materials Science and Engineering,Tianjin University of Technology,Tianjin,China [2]State Key Laboratory of Rare Earth Materials Chemistry and Applications,College of Chemistry and Molecular Engineering,Peking University,Beijing,China [3]State Key Laboratory of High-Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai,China [4]Shanghai Key Laboratory of Magnetic Resonance,School of Physics and Electronic Science,East China Normal University,Shanghai,China

出　　处：《Carbon Energy》2024年第10期116-129,共14页碳能源(英文)

基　　金：National Natural Science Foundation of China(Grant No.52202282);Opening Project of the State Key Laboratory of High-Performance Ceramics and Superfine Microstructure(Grant No.SKL202209SIC);Natural Science Foundation of Tianjin City(Grant No.22JCYBJC00040).

摘　　要：Developing high-capacity and high-rate anodes is significant to engineering sodium-ion batteries with high energy density and high power density.Layered Na_(2)Ti_(3)O_(7)(NTO),with an open crystal structure,large theoretical capacity,and low working potential,is recognized as one of the prospective anodes for sodium storage.Nevertheless,it suffers from sluggish sodiation kinetics and low(micro)structure stability triggered by a high Na+diffusion barrier and weak adhesion of[Ti_(3)O_(7)]slabs.Herein,the interlayered local structure of NTO is regulated to solve the above issues,in which parts of interlayered Na+sites are substituted by H+(Na_(2)−xHxTi_(3)O_(7)[NHTO]).Theoretical calculations prove that the NHTO offers lower activation energy for Na+transports and low interlayer spacings with alleviated Na-Na repulsion and relatively flexible[Ti_(3)O_(7)]slabs to reduce fractural stress.In situ and ex situ characterizations of(micro)structure evolution reveal that NHTO goes through transformation between H-rich and Na-rich phases,resulting in high structure stability and microstructure integrity.The optimal NHTO anode delivers a high capacity of 190.6 mA h g^(−1) at 0.5 C after 300 cycles and a superior high-rate stability of 90.6 mA h g^(−1) at 50 C over 10,000 cycles at room temperature.Besides,it offers a capacity of 50.3 mA h g^(−1) after 1800 cycles at a low temperature of−20°C and 195.7 mA h g^(−1) after 500 cycles at a high temperature of 40°C at 0.5 C.The developed topologically interlayered local structure regulation strategy would raise the prospect of designing high-performance layered anodes.

关 键 词：local structu reregulation microstructure evolution sodium storage sodium titanite wide temperature 

分 类 号：O62[理学—有机化学]