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摘要
通过合理的合成路线与微观结构设计,开发具有高比容量和柔性的钠离子电池负极材料,是当前的难点。采用静电纺丝制备自支撑碳纳米纤维膜,利用不同浓度的硼酸铵溶液对纤维膜进行改性,研究了浸渍溶液浓度和热处理温度对碳纳米纤维膜相组成、微观形貌及储钠性能的影响。结果表明:低浓度硼酸铵溶液改性并未改变纤维膜三维相互交错的空间结构,但纤维膜表面粗糙程度增加,使改性后的碳纳米纤维缺陷和活性点位增多并减小了碳层间距。采用0.02mol/L硼酸铵溶液浸渍改性和600℃热处理后得到的碳纳米纤维膜作为钠离子电池自支撑负极时,可获得最优的储钠性能。在100mA/g电流密度下,该电池初始充比容量为354.7mAh/g,循环100周后电池的可逆充放电比容量为316.8mAh/g,表现出优异的储钠性能。
Abstract
It is currently difficult to develop anode materials for sodium-ion batteries with high specific capacity and flexibility through rational synthetic route and microstructure design.In this paper,self-supporting carbon nanofiber membranes were prepared by electrospinning and modified with different concentrations of ammonium borate solutions.The effects of impregnation solution concentration and heating treatment temperature on the phase composition,microstructure,and sodium storage performance of carbon nanofiber membrane were studied.The results showed that the modification with low concentration ammonium borate solution didn't change the three-dimensional interlaced structure of the nanofiber membrane,but increased its surface roughness,which increased the defects and active points on the nanofiber membrane and reduced the spacing of carbon layer.The modified carbon nanofiber membrane impregnated with ammonium borate solution of 0.02mol/L and calcined at 600℃ presented the optimal sodium storage performance when it was used as the self-supporting anode of sodium-ion battery.At a current density of 100mA/g,the initial charge specific capacity of the battery was 354.7mAh/g,and could remain 316.8mAh/g after 100 cycles,which exhibited excellent sodium storage performance.
关键词
碳纳米纤维
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硼酸铵溶液
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静电纺丝
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储钠性能
Key words
carbon nanofibers
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ammonium borate solution
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electrospinning
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sodium storage performance
硼酸铵改性碳纳米纤维负极材料制备及储钠性能研究[J].
化工新型材料, 2023, 51(4): 108-114 DOI:10.19817/j.cnki.issn1006-3536.2023.04.019
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基金资助
国家自然科学基金面上项目(62074067);广东省教育厅项目(2021KQNCX095)
