{"title":"Nitrogen Doping Enhances Pseudocapacitive Lithium Storage and Ionic Conductivity in Ti2Nb2O9 Nanosheets","authors":"Yun Zhou, Haitao Liu, Jiajun Fu, Jing Xiao, Yaru Liang","doi":"10.1016/j.electacta.2024.145232","DOIUrl":null,"url":null,"abstract":"Titanium-niobium oxides (Ti<sub>x</sub>Nb<sub>y</sub>O<sub>2x+2.5y</sub>) are promising anode materials for lithium-ion batteries due to their suitable lithium insertion potential, excellent rate performance, cycling stability, and considerable capacity based on multi-electron reactions. However, the intrinsic low electrical conductivity and rapid capacity decay during cycling limit their application. In this study, nitrogen-doped Ti<sub>2</sub>Nb<sub>2</sub>O<sub>9</sub> nanosheets were synthesized using a chemical exfoliation method and the subsequent high-temperature phase transition. Meanwhile, introducing nitrogen atoms reduced the bandgap and increased the material's electrical conductivity. Thus, the lithium storage performance of the N-TNO electrode was improved with a reversible capacity of 348.1 mAh g<sup>−1</sup>.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":null,"pages":null},"PeriodicalIF":5.5000,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Electrochimica Acta","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1016/j.electacta.2024.145232","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ELECTROCHEMISTRY","Score":null,"Total":0}
引用次数: 0
Abstract
Titanium-niobium oxides (TixNbyO2x+2.5y) are promising anode materials for lithium-ion batteries due to their suitable lithium insertion potential, excellent rate performance, cycling stability, and considerable capacity based on multi-electron reactions. However, the intrinsic low electrical conductivity and rapid capacity decay during cycling limit their application. In this study, nitrogen-doped Ti2Nb2O9 nanosheets were synthesized using a chemical exfoliation method and the subsequent high-temperature phase transition. Meanwhile, introducing nitrogen atoms reduced the bandgap and increased the material's electrical conductivity. Thus, the lithium storage performance of the N-TNO electrode was improved with a reversible capacity of 348.1 mAh g−1.
期刊介绍:
Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.