{"title":"为高效钠离子电池设计由 TiO2/Bi2Te3/Carbon Cloth 组成的创新异质结构","authors":"Manshu Han, Yirong Zhao, Yongfeng Bai, Yu Li, Minghua Chen and Qingguo Chen","doi":"10.1039/D4CE00712C","DOIUrl":null,"url":null,"abstract":"<p >Bi-based materials can retain massive amounts of sodium ions through alloying and conversion reactions, resulting in excellent theoretical capacity. However, during the sodiation/desodiation process, there is always a significant volume change in the alloying reaction. In this work, TiO<small><sub>2</sub></small>-coated hexagonal-phase topological insulator (TI) Bi<small><sub>2</sub></small>Te<small><sub>3</sub></small> composites grown on carbon cloth (CC) were prepared using a solvothermal reaction and an atomic layer deposition process (TiO<small><sub>2</sub></small>/Bi<small><sub>2</sub></small>Te<small><sub>3</sub></small>/CC) as anode materials for sodium-ion batteries without the need for a binder. Compared to the pure Bi<small><sub>2</sub></small>Te<small><sub>3</sub></small> electrode, the optimized TiO<small><sub>2</sub></small>/Bi<small><sub>2</sub></small>Te<small><sub>3</sub></small>/CC composite exhibits a superior specific capacity of 450 mA h g<small><sup>−1</sup></small>, a high rate performance of 0.1 A g<small><sup>−1</sup></small>, and a high cycling stability of 100 cycles due to the inherent properties of TIs, contributed by the effective TiO<small><sub>2</sub></small> cladding layer and large interfacial spacing of Bi<small><sub>2</sub></small>Te<small><sub>3</sub></small>. The enhanced reversible capacitance, rate capability, and cycling performances can be attributed to the heterointerfaces and excellent mechanical properties of TiO<small><sub>2</sub></small>, which balance the electronic structure of the building blocks and inhibit the detaching of Bi<small><sub>2</sub></small>Te<small><sub>3</sub></small> due to large internal stresses. The amorphous TiO<small><sub>2</sub></small>/Bi<small><sub>2</sub></small>Te<small><sub>3</sub></small>/CC composite was treated in a tubular furnace to obtain crystalline TiO<small><sub>2</sub></small>/Bi<small><sub>2</sub></small>Te<small><sub>3</sub></small>/CC, and the electrochemical performance of the heterostructures formed by the TiO<small><sub>2</sub></small> coating layer with different properties was compared. This work demonstrates the enormous potential for enhancing the sodium-ion storage capabilities of alloy electrode materials by constructing heterostructures.</p>","PeriodicalId":70,"journal":{"name":"CrystEngComm","volume":null,"pages":null},"PeriodicalIF":2.6000,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Designing innovative heterostructures composed of TiO2/Bi2Te3/carbon cloth for highly efficient sodium-ion batteries†\",\"authors\":\"Manshu Han, Yirong Zhao, Yongfeng Bai, Yu Li, Minghua Chen and Qingguo Chen\",\"doi\":\"10.1039/D4CE00712C\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >Bi-based materials can retain massive amounts of sodium ions through alloying and conversion reactions, resulting in excellent theoretical capacity. However, during the sodiation/desodiation process, there is always a significant volume change in the alloying reaction. In this work, TiO<small><sub>2</sub></small>-coated hexagonal-phase topological insulator (TI) Bi<small><sub>2</sub></small>Te<small><sub>3</sub></small> composites grown on carbon cloth (CC) were prepared using a solvothermal reaction and an atomic layer deposition process (TiO<small><sub>2</sub></small>/Bi<small><sub>2</sub></small>Te<small><sub>3</sub></small>/CC) as anode materials for sodium-ion batteries without the need for a binder. Compared to the pure Bi<small><sub>2</sub></small>Te<small><sub>3</sub></small> electrode, the optimized TiO<small><sub>2</sub></small>/Bi<small><sub>2</sub></small>Te<small><sub>3</sub></small>/CC composite exhibits a superior specific capacity of 450 mA h g<small><sup>−1</sup></small>, a high rate performance of 0.1 A g<small><sup>−1</sup></small>, and a high cycling stability of 100 cycles due to the inherent properties of TIs, contributed by the effective TiO<small><sub>2</sub></small> cladding layer and large interfacial spacing of Bi<small><sub>2</sub></small>Te<small><sub>3</sub></small>. The enhanced reversible capacitance, rate capability, and cycling performances can be attributed to the heterointerfaces and excellent mechanical properties of TiO<small><sub>2</sub></small>, which balance the electronic structure of the building blocks and inhibit the detaching of Bi<small><sub>2</sub></small>Te<small><sub>3</sub></small> due to large internal stresses. The amorphous TiO<small><sub>2</sub></small>/Bi<small><sub>2</sub></small>Te<small><sub>3</sub></small>/CC composite was treated in a tubular furnace to obtain crystalline TiO<small><sub>2</sub></small>/Bi<small><sub>2</sub></small>Te<small><sub>3</sub></small>/CC, and the electrochemical performance of the heterostructures formed by the TiO<small><sub>2</sub></small> coating layer with different properties was compared. 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引用次数: 0
摘要
铋基材料可通过合金化和转化反应保留大量钠离子,从而获得出色的理论容量。然而,在钠化/解钠过程中,合金反应总是存在显著的体积变化。本文通过溶热反应和原子层沉积工艺(TiO2/Bi2Te3/CC)制备了生长在碳布(CC)上的 TiO2 涂层六方相拓扑绝缘体(TIs)Bi2Te3 复合材料,作为钠离子电池的负极材料,无需粘结剂。与纯 Bi2Te3 电极相比,经过优化的 TiO2/Bi2Te3/CC 复合材料由于有效的 TiO2 包覆层和 Bi2Te3 的大界面间距,具有 TI 的固有特性,因此表现出卓越的比容量(450 mAh g-1)、高倍率性能(0.1 A g-1)和高循环稳定性(100 次循环)。增强的可逆电容、速率能力和循环性能可归功于 TiO2 的异质界面和优异的机械性能,它们平衡了构建模块的电子结构,并抑制了 Bi2Te3 因较大内应力而脱落。在管式炉中处理无定形 TiO2/Bi2Te3/CC 后得到结晶 TiO2/Bi2Te3/CC,并比较了不同性质的 TiO2 涂层所形成的异质结构的电化学性能。这项工作表明,通过构建异质结构来提高合金电极材料的钠离子存储能力具有巨大的潜力。
Designing innovative heterostructures composed of TiO2/Bi2Te3/carbon cloth for highly efficient sodium-ion batteries†
Bi-based materials can retain massive amounts of sodium ions through alloying and conversion reactions, resulting in excellent theoretical capacity. However, during the sodiation/desodiation process, there is always a significant volume change in the alloying reaction. In this work, TiO2-coated hexagonal-phase topological insulator (TI) Bi2Te3 composites grown on carbon cloth (CC) were prepared using a solvothermal reaction and an atomic layer deposition process (TiO2/Bi2Te3/CC) as anode materials for sodium-ion batteries without the need for a binder. Compared to the pure Bi2Te3 electrode, the optimized TiO2/Bi2Te3/CC composite exhibits a superior specific capacity of 450 mA h g−1, a high rate performance of 0.1 A g−1, and a high cycling stability of 100 cycles due to the inherent properties of TIs, contributed by the effective TiO2 cladding layer and large interfacial spacing of Bi2Te3. The enhanced reversible capacitance, rate capability, and cycling performances can be attributed to the heterointerfaces and excellent mechanical properties of TiO2, which balance the electronic structure of the building blocks and inhibit the detaching of Bi2Te3 due to large internal stresses. The amorphous TiO2/Bi2Te3/CC composite was treated in a tubular furnace to obtain crystalline TiO2/Bi2Te3/CC, and the electrochemical performance of the heterostructures formed by the TiO2 coating layer with different properties was compared. This work demonstrates the enormous potential for enhancing the sodium-ion storage capabilities of alloy electrode materials by constructing heterostructures.