{"title":"导电炭黑内嵌石榴状纳米硅作为锂离子电池负极材料。","authors":"Yu Zhang, Pengliang Gu, Shiyue Zhang, Yanan Xu, Xinyi Fu, Wenkai Wang, Qing Hu, Hao Li, Zhan Shi, Hongbin Du","doi":"10.1002/chem.202502213","DOIUrl":null,"url":null,"abstract":"<p><p>Si materials possess a high theoretical specific capacity when used as anode material in lithium-ion batteries (LIBs). Si/C composites mitigate volume expansion and enhance conductivity, thus achieving improved electrochemical performance in LIBs. Herein, we report a new strategy for preparing pomegranate-like Si/C nanocomposites based on low-cost, readily available conductive carbon black (XC) by using a combination of wet chemical reduction and chemical vapor deposition (CVD) techniques. The preparation first involves a facile wet chemical approach to controlled hydrolysis of SiCl<sub>4</sub> within XC. Subsequently, the obtained SiO<sub>2</sub>/XC precursor is reduced to highly crystalline Si particles within XC (Si/XC) using a novel ionic liquid-magnesium reduction system, avoiding unwanted byproducts associated with conventional high-temperature magnesium reduction. Finally, a pomegranate-like Si/XC composite is coated with an outer carbon layer via CVD, forming a nano-confined Si/C structure. The composites exhibit excellent reversible capacity and good cycle stability in LIBs. At 1 A g<sup>-1</sup> after 400 cycles, the Si/XC@C-0.5 composite delivered the highest specific capacity of 835 mA h g<sup>-1</sup>, exhibiting a capacity retention rate of 121% compared to the first cycle after activation (688 mA h g<sup>-1</sup>). This work provides reproducible and scalable means to prepare high-performance Si/C composites for LIBs.</p>","PeriodicalId":144,"journal":{"name":"Chemistry - A European Journal","volume":" ","pages":"e02213"},"PeriodicalIF":3.7000,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Pomegranate-Like Nano-Confined Silicon Inside Conductive Carbon Black as Anode Materials for Lithium-Ion Batteries.\",\"authors\":\"Yu Zhang, Pengliang Gu, Shiyue Zhang, Yanan Xu, Xinyi Fu, Wenkai Wang, Qing Hu, Hao Li, Zhan Shi, Hongbin Du\",\"doi\":\"10.1002/chem.202502213\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>Si materials possess a high theoretical specific capacity when used as anode material in lithium-ion batteries (LIBs). Si/C composites mitigate volume expansion and enhance conductivity, thus achieving improved electrochemical performance in LIBs. Herein, we report a new strategy for preparing pomegranate-like Si/C nanocomposites based on low-cost, readily available conductive carbon black (XC) by using a combination of wet chemical reduction and chemical vapor deposition (CVD) techniques. The preparation first involves a facile wet chemical approach to controlled hydrolysis of SiCl<sub>4</sub> within XC. Subsequently, the obtained SiO<sub>2</sub>/XC precursor is reduced to highly crystalline Si particles within XC (Si/XC) using a novel ionic liquid-magnesium reduction system, avoiding unwanted byproducts associated with conventional high-temperature magnesium reduction. Finally, a pomegranate-like Si/XC composite is coated with an outer carbon layer via CVD, forming a nano-confined Si/C structure. The composites exhibit excellent reversible capacity and good cycle stability in LIBs. At 1 A g<sup>-1</sup> after 400 cycles, the Si/XC@C-0.5 composite delivered the highest specific capacity of 835 mA h g<sup>-1</sup>, exhibiting a capacity retention rate of 121% compared to the first cycle after activation (688 mA h g<sup>-1</sup>). This work provides reproducible and scalable means to prepare high-performance Si/C composites for LIBs.</p>\",\"PeriodicalId\":144,\"journal\":{\"name\":\"Chemistry - A European Journal\",\"volume\":\" \",\"pages\":\"e02213\"},\"PeriodicalIF\":3.7000,\"publicationDate\":\"2025-09-24\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Chemistry - A European Journal\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://doi.org/10.1002/chem.202502213\",\"RegionNum\":2,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemistry - A European Journal","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1002/chem.202502213","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
摘要
硅材料作为锂离子电池的负极材料具有较高的理论比容量。Si/C复合材料减轻了体积膨胀,提高了导电性,从而改善了锂离子电池的电化学性能。在此,我们报告了一种基于低成本,易于获得的导电炭黑(XC)的新策略,该策略采用湿化学还原和化学气相沉积(CVD)技术相结合的方法制备了石榴状Si/C纳米复合材料。该制备首先涉及一种简便的湿化学方法,以控制XC内SiCl4的水解。随后,使用一种新型离子液体-镁还原系统,将得到的SiO2/XC前驱体在XC (Si/XC)中还原为高结晶Si颗粒,避免了传统高温镁还原过程中产生的副产品。最后,通过CVD在石榴状的Si/XC复合材料外层包裹一层碳层,形成纳米限制Si/C结构。复合材料在lib中表现出优异的可逆性能和良好的循环稳定性。400次循环后,在1 A g-1下,Si/XC@C-0.5复合材料的比容量最高,为835 mA h g-1,与活化后的第一次循环(688 mA h g-1)相比,容量保持率为121%。这项工作为制备用于lib的高性能Si/C复合材料提供了可重复和可扩展的方法。
Pomegranate-Like Nano-Confined Silicon Inside Conductive Carbon Black as Anode Materials for Lithium-Ion Batteries.
Si materials possess a high theoretical specific capacity when used as anode material in lithium-ion batteries (LIBs). Si/C composites mitigate volume expansion and enhance conductivity, thus achieving improved electrochemical performance in LIBs. Herein, we report a new strategy for preparing pomegranate-like Si/C nanocomposites based on low-cost, readily available conductive carbon black (XC) by using a combination of wet chemical reduction and chemical vapor deposition (CVD) techniques. The preparation first involves a facile wet chemical approach to controlled hydrolysis of SiCl4 within XC. Subsequently, the obtained SiO2/XC precursor is reduced to highly crystalline Si particles within XC (Si/XC) using a novel ionic liquid-magnesium reduction system, avoiding unwanted byproducts associated with conventional high-temperature magnesium reduction. Finally, a pomegranate-like Si/XC composite is coated with an outer carbon layer via CVD, forming a nano-confined Si/C structure. The composites exhibit excellent reversible capacity and good cycle stability in LIBs. At 1 A g-1 after 400 cycles, the Si/XC@C-0.5 composite delivered the highest specific capacity of 835 mA h g-1, exhibiting a capacity retention rate of 121% compared to the first cycle after activation (688 mA h g-1). This work provides reproducible and scalable means to prepare high-performance Si/C composites for LIBs.
期刊介绍:
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