基于聚吡咯包覆的四氧化三铁在锂离子电池中的应用研究
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摘要
本研究以氯化铁、柠檬酸钠及醋酸钠为原料,乙二醇为溶剂通过溶剂热的方法合成了直径为200-300纳米的四氧化三铁(Fe_3O_4)纳米球。然后通过单体吡咯低温下的聚合,使聚吡咯均匀分布在Fe_3O_4球体表面,最后经过碳化得到含氮碳包覆的Fe_3O_4纳米球。分别对Fe_3O_4纳米球与包覆碳层后的Fe_3O_4纳米球进行电化学性能测试。结果表明:包覆碳层之后的Fe_3O_4球表现出更稳定的循环性能,在100 mA g~(-1)的电流密度条件下,经过85圈的循环能够保持513mAh g~(-1)的比容量,从第二圈起每圈衰减平均为0.17%,比没有包覆的Fe_3O_4稳定性大大提高。
In this paper, Fe_3O_4 nanopheres with diameters of 200-300 nm were synthesized by using ferric chloride, sodium citrate and sodium acetate as raw materials and ethylene glycol as solvent. Then the polypyrrole was uniformly coated on the surface of Fe_3O_4 nanopheres through the polymerization of the monomer pyrrole at low temperature, and finally the Fe_3O_4 nanopheres with nitrogen-containing carbon layer were obtained through further carbonization. And then, the electrochemical performance of Fe_3O_4 nanopheres and Fe_3O_4 nanopheres with nitrogen-containing carbon layer was tested respectively, and the Fe_3O_4 nanopheres with nitrogen-containing carbon layer present more stable cycling performance, at the current density of 100 mA g~(-1), the discharge capacity can still remain at 513 mAh g~(-1) after 85 cycles with a low the capacity fading about 0.17% per cycle. Compared with the uncoated Fe_3O_4 nanopheres, the electrochemicalperformance stability of Fe_3O_4 nanopheres with nitrogen-containing carbon layer is greatly improved.
In this paper, Fe_3O_4 nanopheres with diameters of 200-300 nm were synthesized by using ferric chloride, sodium citrate and sodium acetate as raw materials and ethylene glycol as solvent. Then the polypyrrole was uniformly coated on the surface of Fe_3O_4 nanopheres through the polymerization of the monomer pyrrole at low temperature, and finally the Fe_3O_4 nanopheres with nitrogen-containing carbon layer were obtained through further carbonization. And then, the electrochemical performance of Fe_3O_4 nanopheres and Fe_3O_4 nanopheres with nitrogen-containing carbon layer was tested respectively, and the Fe_3O_4 nanopheres with nitrogen-containing carbon layer present more stable cycling performance, at the current density of 100 mA g~(-1), the discharge capacity can still remain at 513 mAh g~(-1) after 85 cycles with a low the capacity fading about 0.17% per cycle. Compared with the uncoated Fe_3O_4 nanopheres, the electrochemicalperformance stability of Fe_3O_4 nanopheres with nitrogen-containing carbon layer is greatly improved.
引文
[1]Dunn B,Kamath H,Tarascon J M.Electrical energy storage for the grid:a battery of choices[J].Science,2011,334(6058):928-935.
[2]Xin X,Zhou X,Wu J,et al.Scalable synthesis of Ti O2/graphene nanostructured composite with high-rate performance for lithium ion batteries[J].ACS nano,2012,6(12):11035-11043.
[3]Taberna P L,Mitra S,Poizot P,et al.High rate capabilities Fe3O4-based Cu nano-architectured electrodes for lithium-ion battery applications[J].Nat Mater,2006,5(7):567-573.
[4]He C,Wu S,Zhao N,et al.Carbon-encapsulated Fe3O4nanoparticles as a high-rate lithium ion battery anode material[J].ACS nano,2013,7(5):4459-4469.
[5]Geng P,Zheng S,Tang H,et al.Transition metal sulfides based on graphene for electrochemical energy storage[J].Adv Energy Mater,2018,8(15):1703259-1703284.
[6]Yang Z,Shen J,Archer L A.An in situ method of creating metal oxide-carbon composites and their application as anode materials for lithium-ion batteries[J].J Mater Chem,2011,21(30):11092-11097.
[7]Zhu T,Chen J S,Lou X W.Glucose-assisted one-pot synthesis of FeOOH nanorods and their transformation to Fe3O4@carbon nanorods for application in lithium ion batteries[J].J Phys Chem C,2011,115(19):9814-9820.
[2]Xin X,Zhou X,Wu J,et al.Scalable synthesis of Ti O2/graphene nanostructured composite with high-rate performance for lithium ion batteries[J].ACS nano,2012,6(12):11035-11043.
[3]Taberna P L,Mitra S,Poizot P,et al.High rate capabilities Fe3O4-based Cu nano-architectured electrodes for lithium-ion battery applications[J].Nat Mater,2006,5(7):567-573.
[4]He C,Wu S,Zhao N,et al.Carbon-encapsulated Fe3O4nanoparticles as a high-rate lithium ion battery anode material[J].ACS nano,2013,7(5):4459-4469.
[5]Geng P,Zheng S,Tang H,et al.Transition metal sulfides based on graphene for electrochemical energy storage[J].Adv Energy Mater,2018,8(15):1703259-1703284.
[6]Yang Z,Shen J,Archer L A.An in situ method of creating metal oxide-carbon composites and their application as anode materials for lithium-ion batteries[J].J Mater Chem,2011,21(30):11092-11097.
[7]Zhu T,Chen J S,Lou X W.Glucose-assisted one-pot synthesis of FeOOH nanorods and their transformation to Fe3O4@carbon nanorods for application in lithium ion batteries[J].J Phys Chem C,2011,115(19):9814-9820.