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Low Temperature Tetragonal Tungsten Bronze Oxides for Li-ion Storage

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Nb-based tungsten bronze oxides have emerged as attractive materials in various fields,owing to the structural openings and simple synthesis method.In this work,the tetragonal tungsten bronze(TTB)NaWNbO6 was prepared by solid state reaction at a relatively low temperature of 775 ℃.The local structure was systematically studied by solid state nuclear magnetic resonance(SSNMR)with the aid of transition electronic microscopy(TEM).The analysis indicates that NaWNbO6 has pentagonal,square,and triangular tunnels.Notably,square tunnels were partly occupied(50％)by Na,which creates the ability for the Li-ion storage with a volumetric capacity of 210 A·h·L-1 at 0.2 C.The 2D 23Na-23Na EXSY results further suggest the ability of ions to fast exchange between the tetragonal and pentagonal tunnels,resulting in a high-rate performance 20 C.

Tetragonal tungsten bronzeSolid-state 23Na NMR93Nb NMR spectrumFast ion exchange

XU Chengxin、ZHANG Wenda、LOU Chenjie、LI Chengyu、XU Ligang、SHI Yongchao、LIU Jie、LUO Huajie、FU Jipeng、KUANG Xiaojun、TANG Mingxue

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Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials,College of Chemistry and Bioengineering,Guilin University of Technology,Guilin 541006,P.R.China

Center for High Pressure Science and Technology Advanced Research,Beijing 100193,P.R.China

Guangxi Key Laboratory of Optic and Electronic Materials and Devices,Key Laboratory of New Processing Technology for Nonferrous Metals and Materials,Ministry of Education,College of Materials Science and Engineering,Guilin University of Technology,Guilin 541004,P.R.China

School of Materials Science and Engineering & Key Laboratory of Advanced Materials and Devices for Post-Moore Chips,Ministry of Education,University of Science and Technology Beijing,Beijing 100083,P.R.China

Key Laboratory of Rare Earth Optoelectronic Materials and Devices of Zhejiang Province,Institute of Optoelectronic Materials and Devices,China Jiliang University,Hangzhou 310018,P.R.China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaGuangxi Natural Science Foundation,China

22090043216221012019GXNSFGA245006

2024

10.1007/s40242-024-4173-7

高等学校化学研究(英文版)
吉林大学

高等学校化学研究(英文版)

CSTPCD
影响因子：0.871
ISSN：1005-9040
年,卷(期)：2024.40(5)