稳定导电网络结构的C-SnO_(2)/MWCNTs复合材料用于锂浆料电池  

C-SnO_(2)/MWCNTs Composite with Stable Conductive Network for Lithiumbased Semi-Solid Flow Batteries

作　　者：杨博文 王瑞 辛本舰 刘丽丽 牛志强[2] Bowen Yang;Rui Wang;Benjian Xin;Lili Liu;Zhiqiang Niu(Tianjin Key Laboratory for Photoelectric Materials and Devices,School of Materials Science and Engineering,Tianjin University of Technology,Tianjin 300384,China;Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),Haihe Laboratory of Sustainable Chemical Transformations,College of Chemistry,Nankai University,Tianjin 300071,China)

机构地区：[1]天津理工大学材料科学与工程学院,天津市光电显示材料与器件重点实验室,天津300384 [2]南开大学化学学院,先进能源材料化学教育部重点实验室,物质绿色创造与制造海河实验室,天津300071

出　　处：《物理化学学报》2025年第2期98-106,共9页Acta Physico-Chimica Sinica

基　　金：国家重点研发计划(2019YFA0705601);国家自然科学基金(51972231)资助项目。

摘　　要：锂浆料电池(LSSFBs)具有应用于大规模储能系统的潜力。然而,LSSFBs的电化学性能受限于活性材料本征导电性差以及活性材料与导电添加剂之间的不稳定接触。本文设计了碳包覆的二氧化锡/多壁碳纳米管(C-SnO_(2)/MWCNTs)复合材料作为LSSFBs负极材料。在该复合材料中,SnO_(2)纳米颗粒均匀分布在(MWCNTs)表面,同时SnO_(2)颗粒外表进行碳包覆。纳米尺寸赋予SnO_(2)更多反应活性位点。此外,碳纳米管和碳包覆层共同构建稳定的导电网络。这种导电网络有效改善SnO_(2)的电子转移动力学,并抑制其在充/放电过程中的体积膨胀,从而提高倍率和循环性能。此外,MWCNTs增强浆料电极的悬浮稳定性。这些优势赋予LSSFBs良好的倍率和循环性能。这项工作为优化LSSFBs的浆料电极提供了一种具有前景的策略。Lithium-based semi-solid flow batteries(LSSFBs)could potentially be applied in large-scale energy storage systems due to their high safety and relatively independent equipment units.However,the electrochemical performance of LSSFBs is limited by the unstable contact between conductive additives and active materials,as well as the poor conductivity of active materials.Therefore,it is necessary to develop semi-solid electrodes with high stability and specific capacity to obtain LSSFBs with satisfied energy density.Herein,carbon-coated SnO_(2)/multi-walled carbon nanotubes(CSnO_(2)/MWCNTs)composite was designed as the anode material of LSSFBs.In such composite,SnO_(2) nanoparticles are uniformly distributed on the surface of MWCNTs and coated with carbon layer,which was identified by field-emission scanning electron microscopy,transmission electron microscopy and X-ray diffraction(XRD)results.In general,the traditional SnO_(2) as active material in electrodes will suffer from volume expansion and collapse of structure,which will decline the cycle life of batteries.In this composite,the nanoparticle structure endows SnO_(2) with more reaction active sites.Furthermore,MWCNTs and carbon layer can construct a stable conductive network,which enhances the electron transport in SnO_(2)-based electrodes.Simultaneously,MWCNTs and carbon layer also achieve an integrated architecture.Thus,the electron transfer dynamics of SnO_(2)-based electrodes could be improved and their volume expansion is effectively suppressed during charging/discharging process,resulting in improved rate and cycling performance.The coin-type batteries based on C-SnO_(2)/MWCNTs can maintain a discharge capacity of 725 mAh∙g-1 after 100 cycles under a current density of 0.5 A∙g-1.On the contrary,the discharge capacity of the batteries based on bulk SnO_(2) almost disappears after 100 cycles,which is attributed to the poor conductivity and excessive volume expansion of electrode materials.In addition,the MWCNTs will enhance the suspension stability of

关 键 词：浆料电池 纳米尺寸SnO_(2) 碳纳米管 碳包覆 

分 类 号：O646[理学—物理化学]