{"title":"铁和类 Li2MnO3 结构域对无钴富锂层状氧化物阴极结构稳定性的影响","authors":"Yu Zhang, Mingxia Yan, Xin Guo, Xu Zhang, Jihong Liu, Jiyang Zhang, Jiapeng Zhu, Shengli An, Guixiao Jia","doi":"10.1002/qua.27440","DOIUrl":null,"url":null,"abstract":"<p>The aggregation of Li<sub>2</sub>MnO<sub>3</sub>-like domains in Li-rich layered oxides (LLOs) causes severe capacity/voltage fading, which seriously impedes their commercial applications. Here, we design Co-free Li-rich Li<span></span>Fe<span></span>Ni<span></span>Mn<span></span>O system with dispersed small-sized Li<sub>2</sub>MnO<sub>3</sub>–like domains (D-LFNMO) and aggregated Li<sub>2</sub>MnO<sub>3</sub>-like domains (A-LFNMO) to investigate effects of Li<sub>2</sub>MnO<sub>3</sub>-like domain sizes and Fe content on structures and oxidation process using density function theory (DFT) calculations. De-lithiation structures, structural stability and oxidization mechanism of lattice oxygen ions are explored. Structural stability is finished through calculating oxygen release energies and migration energy barriers of Mn<sup>4+</sup> ions based on a climbing image nudged elastic band (CI–NEB) method. Research shows that LLOs with dispersed small-sized Li<sub>2</sub>MnO<sub>3</sub>-like domains and the moderate Fe content would possess highly reversible oxygen redox and excellent structural stability and would exhibit superior cycling stability of high capacity. The findings provide new perspectives and concepts for designing high-energy Li-rich cathodes.</p>","PeriodicalId":182,"journal":{"name":"International Journal of Quantum Chemistry","volume":"124 13","pages":""},"PeriodicalIF":2.3000,"publicationDate":"2024-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effects of Fe and Li2MnO3-like domains on structural stability in Co-free Li-rich layered oxide cathodes\",\"authors\":\"Yu Zhang, Mingxia Yan, Xin Guo, Xu Zhang, Jihong Liu, Jiyang Zhang, Jiapeng Zhu, Shengli An, Guixiao Jia\",\"doi\":\"10.1002/qua.27440\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The aggregation of Li<sub>2</sub>MnO<sub>3</sub>-like domains in Li-rich layered oxides (LLOs) causes severe capacity/voltage fading, which seriously impedes their commercial applications. Here, we design Co-free Li-rich Li<span></span>Fe<span></span>Ni<span></span>Mn<span></span>O system with dispersed small-sized Li<sub>2</sub>MnO<sub>3</sub>–like domains (D-LFNMO) and aggregated Li<sub>2</sub>MnO<sub>3</sub>-like domains (A-LFNMO) to investigate effects of Li<sub>2</sub>MnO<sub>3</sub>-like domain sizes and Fe content on structures and oxidation process using density function theory (DFT) calculations. De-lithiation structures, structural stability and oxidization mechanism of lattice oxygen ions are explored. Structural stability is finished through calculating oxygen release energies and migration energy barriers of Mn<sup>4+</sup> ions based on a climbing image nudged elastic band (CI–NEB) method. Research shows that LLOs with dispersed small-sized Li<sub>2</sub>MnO<sub>3</sub>-like domains and the moderate Fe content would possess highly reversible oxygen redox and excellent structural stability and would exhibit superior cycling stability of high capacity. The findings provide new perspectives and concepts for designing high-energy Li-rich cathodes.</p>\",\"PeriodicalId\":182,\"journal\":{\"name\":\"International Journal of Quantum Chemistry\",\"volume\":\"124 13\",\"pages\":\"\"},\"PeriodicalIF\":2.3000,\"publicationDate\":\"2024-06-23\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Quantum Chemistry\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/qua.27440\",\"RegionNum\":3,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Quantum Chemistry","FirstCategoryId":"92","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/qua.27440","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Effects of Fe and Li2MnO3-like domains on structural stability in Co-free Li-rich layered oxide cathodes
The aggregation of Li2MnO3-like domains in Li-rich layered oxides (LLOs) causes severe capacity/voltage fading, which seriously impedes their commercial applications. Here, we design Co-free Li-rich LiFeNiMnO system with dispersed small-sized Li2MnO3–like domains (D-LFNMO) and aggregated Li2MnO3-like domains (A-LFNMO) to investigate effects of Li2MnO3-like domain sizes and Fe content on structures and oxidation process using density function theory (DFT) calculations. De-lithiation structures, structural stability and oxidization mechanism of lattice oxygen ions are explored. Structural stability is finished through calculating oxygen release energies and migration energy barriers of Mn4+ ions based on a climbing image nudged elastic band (CI–NEB) method. Research shows that LLOs with dispersed small-sized Li2MnO3-like domains and the moderate Fe content would possess highly reversible oxygen redox and excellent structural stability and would exhibit superior cycling stability of high capacity. The findings provide new perspectives and concepts for designing high-energy Li-rich cathodes.
期刊介绍:
Since its first formulation quantum chemistry has provided the conceptual and terminological framework necessary to understand atoms, molecules and the condensed matter. Over the past decades synergistic advances in the methodological developments, software and hardware have transformed quantum chemistry in a truly interdisciplinary science that has expanded beyond its traditional core of molecular sciences to fields as diverse as chemistry and catalysis, biophysics, nanotechnology and material science.