{"title":"Intercalation design of layered vanadium phosphate based cathode material towards high-performance aqueous zinc-ion batteries","authors":"","doi":"10.1016/j.jelechem.2024.118755","DOIUrl":null,"url":null,"abstract":"<div><div>Aqueous zinc-ion batteries (AZIBs) have attracted significant attention because of high theoretical energy density, low cost, environmental friendliness and high safety. Among various cathode materials, vanadium phosphate (VOPO<sub>4</sub>) with a layered structure exhibits huge potential due to high Zn-storage capacity. However, the poor intrinsic conductivity and structural deterioration during the cycling process always result in low Zn<sup>2+</sup> diffusion coefficient and weak reversibility. Herein, a novel potassium vanadyl phosphate (KVOPO<sub>4</sub>) cathode material was designed by the intercalation of K<sup>+</sup> into the interlayer of VOPO<sub>4</sub> via a simple solvothermal reaction. Benefiting from the unique layered structure and intercalation effect, the KVOPO<sub>4</sub> electrode exhibits large discharge capacity and enhanced cycling stability (153.2 mAh g<sup>−1</sup> at 1 A/g after 400 cycles), and excellent rate capability (119.4 mAh g<sup>−1</sup> at 5.0 A/g). The electrode also suggests a pseudocapacitance controlled storage behavior with high contribution percentage of 98 % at 0.8 mV/s. Besides, ex-situ XRD and XPS were conducted to demonstrate the related phase transitions upon the Zn<sup>2+</sup> insertion/extraction process, revealing the reversible Zn-storage mechanism of the KVOPO<sub>4</sub>. This work is expected to enrich the design strategy of VOPO<sub>4</sub>-based cathode materials and pave the exploration of high-performance AZIBs towards energy storage applications.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":null,"pages":null},"PeriodicalIF":4.1000,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Electroanalytical Chemistry","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1572665724007331","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Aqueous zinc-ion batteries (AZIBs) have attracted significant attention because of high theoretical energy density, low cost, environmental friendliness and high safety. Among various cathode materials, vanadium phosphate (VOPO4) with a layered structure exhibits huge potential due to high Zn-storage capacity. However, the poor intrinsic conductivity and structural deterioration during the cycling process always result in low Zn2+ diffusion coefficient and weak reversibility. Herein, a novel potassium vanadyl phosphate (KVOPO4) cathode material was designed by the intercalation of K+ into the interlayer of VOPO4 via a simple solvothermal reaction. Benefiting from the unique layered structure and intercalation effect, the KVOPO4 electrode exhibits large discharge capacity and enhanced cycling stability (153.2 mAh g−1 at 1 A/g after 400 cycles), and excellent rate capability (119.4 mAh g−1 at 5.0 A/g). The electrode also suggests a pseudocapacitance controlled storage behavior with high contribution percentage of 98 % at 0.8 mV/s. Besides, ex-situ XRD and XPS were conducted to demonstrate the related phase transitions upon the Zn2+ insertion/extraction process, revealing the reversible Zn-storage mechanism of the KVOPO4. This work is expected to enrich the design strategy of VOPO4-based cathode materials and pave the exploration of high-performance AZIBs towards energy storage applications.
期刊介绍:
The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied.
Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.