化工新型材料

化工新型材料 ›› 2018, Vol. 46 ›› Issue (5) : 204-207.

科学研究

静电纺丝法制备尖晶石型LiMn₂O₄纳米纤维锂离子电池正极材料

^1,2

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Preparationof spinel LiMn₂O₄ nanofibre as anode material of lithium-ion battery by electrospinning

Dai Jianfeng^1,2, Yan Xingshan², Tian Xiguang², Li Weixue², Wang Qing²

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Received		Published
2017-01-17		2018-05-20
Issue Date	Revised Date
2018-07-03	2017-01-17

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摘要

通过静电纺丝法成功制备出尖晶石型LiMn₂O₄纳米纤维前驱丝,进一步在600～800℃之间对纳米纤维前驱丝进行煅烧,在700℃得到表面光滑且结晶度良好的LiMn₂O₄纳米纤维材料。通过X射线衍射可知LiMn₂O₄的结构为尖晶石型;通过扫描电镜发现LiMn₂O₄的直径约为350nm;再将LiMn₂O₄正极材料组装成扣式电池,通过测试其充放电性能,可知LiMn₂O₄正极材料在0.1C倍率下的首次充放电比容量分别为114.1和112mAh/g,在1C、2C、5C和10C倍率下的放电比容量分别为109.1、101.9、91.3和80.6mAh/g,而且在1C倍率下循环100次之后,容量保持率为92.7%;循环伏安曲线表明其两对氧化还原峰为3.92/4.10V和4.05/4.22V,是典型的尖晶石型LiMn₂O₄材料,且循环性能良好;由交流阻抗图谱可知LiMn₂O₄样品的电荷转移阻抗约为622.21Ω。

Abstract

LiMn₂O₄ nanofibres were prepared by electrospinning technique combined with annealing.LiMn₂O₄ nanofibres had a smooth morphology and the single phase with high crystallinity after being annealing at 700℃.XRD revealed that LiMn₂O₄ nanofibres possessed the spinel structure.SEM images showed that the diameter of LiMn₂O₄ nanofibres was 350nm.Then accessory materials were performed into coin-type Li battery in the glove box and sequentially assembled.The initial charge capacity and discharge capacity were 114.1mAh/g and 112mAh/g at 0.1C,respectively.And the discharge capacity was 109.1mAh/g,101.9mAh/g,91.3mAh/g and 80.6mAh/g at 1C,2C,5C,and 10C,respectively.The capacity retention of 92.7% after 100 cycles under 1C.CV showed that the characteristic two-step redox peaks were at 3.92/4.10V and 4.05/4.22V,which were characteristic peaks of LiMn₂O₄.The EIS spectrum showed that the charge-transfer resistance R_ct of LiMn₂O₄ was 622.21Ω.

关键词

锂离子电池 / 正极材料 / 静电纺丝 / 纳米纤维

Key words

lithium-ion battery / anode material / electrospinning / nanofibres

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静电纺丝法制备尖晶石型LiMn₂O₄纳米纤维锂离子电池正极材料[J]. 化工新型材料, 2018, 46(5): 204-207 DOI:

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参考文献

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