网格结构SnO2纤维的制备及其储锂性能
Preparation and Lithium Storage Properties of Grid-like SnO2 Fibers
作者单位E-mail
吁霁 南昌大学化学学院, 南昌 330031 yuji@ncu.edu.cn 
魏海燕 南昌大学化学学院, 南昌 330031  
李丽 南昌大学化学学院, 南昌 330031  
杨震宇 南昌大学化学学院, 南昌 330031  
蔡建信 南昌大学化学学院, 南昌 330031  
摘要: 采用静电纺丝技术由不同浓度纺丝液制备了SnO2-PVP纤维,并分别在氩气和空气中煅烧后获得SnO2纤维和SnO2-C纤维。物化性能表征表明所合成的SnO2纤维及SnO2-C纤维具有特殊的网格结构,存在较多空隙能有效缓冲SnO2充放电过程中剧烈的体积变化,因而样品具有比SnO2纳米颗粒更好的储锂性能。SnO2-C纤维中含有较多的C具有较好的倍率性能,但放电容量较低。SnO2纤维具有较高的放电容量,同时具有较好的循环稳定性。在电流密度为0.4、0.8、1.6、2.4和4 A·g-1,10次循环后放电容量分别达到1 372、832、685、642和599 mAh·g-1,且当电流密度回落至0.4 A·g-1时放电容量可恢复到1 113 mAh·g-1;另外在电流密度1.6 A·g-1下充放电200次后纤维的放电容量仍可达到613 mAh·g-1、库伦效率接近100%,表现出极好的倍率性能和循环稳定性。
关键词: 锂离子电池  SnO2纤维  SnO2-C纤维  负极材料  静电纺丝
基金项目: 国家自然科学基金(No.51662029,21365013)资助项目。
Abstract: SnO2 fibers and SnO2-C fibers were synthesized through electrospun technology and calcined under air or Ar atmosphere. Samples were characterized by different methods. The results showed that SnO2 fibers and SnO2-C fibers have a grid-like structure, which can effectively alleviate the disadvantages caused by the huge volume change of SnO2 during charging-discharging process. SnO2-C fibers showed a better electrochemical performance than SnO2 nanoparticles, but worse than that of SnO2 fibers. SnO2 fibers could discharged a much high capacity and had a good rate performance and long cycle life at the same time. After working at the current density of 0.4, 0.8, 1.6, 2.4 A·g-1 and 4 A·g-1 for 10 cycles, SnO2 fibers could still discharge a capacity of 1 372, 832, 685, 642 and 599 mAh·g-1. And when the current density went back to 0.4 A·g-1, its capacity could arrive 1 113 mAh·g-1 again. Furthermore, the SnO2 fibers could also release a high discharge capacity of 613 mAh·g-1 and almost 100% coulomb efficiency after 200 cycles at the current density of 1.6 A·g-1, showing an excellent electrochemistry performance.
Keywords: lithium-ion battery  SnO2 fibers  SnO2-C fibers  anode material  electrospinning
投稿时间:2018-04-16 修订日期:2018-07-19
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吁霁,魏海燕,李丽,杨震宇,蔡建信.网格结构SnO2纤维的制备及其储锂性能[J].无机化学学报,2018,34(10):1792-1798.
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