Ziming Wang, Hao Chen, Qi Zhao, Yu Shi, Haiyang Wang, Yuxuan Ye, Yu Guo, Zhiguo Du, Shubin Yang
{"title":"High entropy induced lattice expansion in layered oxide cathode towards fast sodium storage","authors":"Ziming Wang, Hao Chen, Qi Zhao, Yu Shi, Haiyang Wang, Yuxuan Ye, Yu Guo, Zhiguo Du, Shubin Yang","doi":"10.1016/j.ensm.2024.103617","DOIUrl":null,"url":null,"abstract":"<div><p>Although O3-type layered oxides have become viable cathode materials for sodium-ion batteries (SIBs) due to their high energy densities, they still suffer from narrow ion channels and serious structure degradation, severely jeopardizing their electrochemical properties. Here, a stable O3-type layered oxide NaNi<sub>0.4</sub>Mn<sub>0.4</sub>M<sub>0.2</sub>O<sub>2</sub> (M= Fe, Cu, Mg, Ti, Sn) (HE-NaNM) was synthesized by a high-entropy doping strategy. Owing to the introduction of the metal cations with ionic radiuses in a range of 0.61-0.73 Å into the layered structure, the lattice is expanded from 15.94 to 16.03 Å in <em>c</em>-axis, associated with a high distortion of TMO<sub>6</sub> octahedrons, offering broad channels for sodium-ion transport in the lattices. Moreover, such expanded lattices and highly distorted TMO<sub>6</sub> octahedrons enable to efficiently restrain the migration of TM ions and the severe sliding of TMO<sub>2</sub> slabs, affording one-step reversible structure evolution between O3 and P3 phase during sodium extraction/insertion without formation of harmful interphases. As a result, a good rate capability of 77.9 mAh g<sup>-1</sup> at 10 C and a long-term cycling stability up to 400 cycles at 5 C are achieved for sodium storage.</p></div>","PeriodicalId":306,"journal":{"name":"Energy Storage Materials","volume":null,"pages":null},"PeriodicalIF":18.9000,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Energy Storage Materials","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2405829724004434","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Although O3-type layered oxides have become viable cathode materials for sodium-ion batteries (SIBs) due to their high energy densities, they still suffer from narrow ion channels and serious structure degradation, severely jeopardizing their electrochemical properties. Here, a stable O3-type layered oxide NaNi0.4Mn0.4M0.2O2 (M= Fe, Cu, Mg, Ti, Sn) (HE-NaNM) was synthesized by a high-entropy doping strategy. Owing to the introduction of the metal cations with ionic radiuses in a range of 0.61-0.73 Å into the layered structure, the lattice is expanded from 15.94 to 16.03 Å in c-axis, associated with a high distortion of TMO6 octahedrons, offering broad channels for sodium-ion transport in the lattices. Moreover, such expanded lattices and highly distorted TMO6 octahedrons enable to efficiently restrain the migration of TM ions and the severe sliding of TMO2 slabs, affording one-step reversible structure evolution between O3 and P3 phase during sodium extraction/insertion without formation of harmful interphases. As a result, a good rate capability of 77.9 mAh g-1 at 10 C and a long-term cycling stability up to 400 cycles at 5 C are achieved for sodium storage.
期刊介绍:
Energy Storage Materials is a global interdisciplinary journal dedicated to sharing scientific and technological advancements in materials and devices for advanced energy storage and related energy conversion, such as in metal-O2 batteries. The journal features comprehensive research articles, including full papers and short communications, as well as authoritative feature articles and reviews by leading experts in the field.
Energy Storage Materials covers a wide range of topics, including the synthesis, fabrication, structure, properties, performance, and technological applications of energy storage materials. Additionally, the journal explores strategies, policies, and developments in the field of energy storage materials and devices for sustainable energy.
Published papers are selected based on their scientific and technological significance, their ability to provide valuable new knowledge, and their relevance to the international research community.