Low Temperature Tetragonal Tungsten Bronze Oxides for Li-ion Storage  

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

机构地区：[1]Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials,College of Chemistry and Bioengineering,Guilin University of Technology,Guilin,541006,P.R.China [2]Center for High Pressure Science and Technology Advanced Research,Beijing,100193,P.R.China [3]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 [4]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 [5]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

出　　处：《Chemical Research in Chinese Universities》2024年第5期922-926,共5页高等学校化学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.22090043,21622101);the Guangxi Natural Science Foundation,China(No.2019GXNSFGA245006).

摘　　要：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)NaWNbO_(6) was prepared by solid state reaction at a relatively low temperature of 775°C.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 ^(23)Na-^(23)Na 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.

关 键 词：Tetragonal tungsten bronze Solid-state^(23)Na NMR ^(93)Nb NMR spectrum Fast ion exchange 

分 类 号：TM912[电气工程—电力电子与电力传动]