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  • 王瑜東, 楊凱, 張明杰, 李建玲, 高飛, 劉皓, 耿萌萌. 靜電紡絲法制備空心鈦酸鋰材料[J]. 工程科學學報, 2019, 41(1): 111-116. DOI: 10.13374/j.issn2095-9389.2019.01.012
    引用本文: 王瑜東, 楊凱, 張明杰, 李建玲, 高飛, 劉皓, 耿萌萌. 靜電紡絲法制備空心鈦酸鋰材料[J]. 工程科學學報, 2019, 41(1): 111-116. DOI: 10.13374/j.issn2095-9389.2019.01.012
    WANG Yu-dong, YANG Kai, ZHANG Ming-jie, LI Jian-ling, GAO Fei, LIU Hao, GENG Meng-meng. Fabrication of hollow lithium titanate material by electrospinning[J]. Chinese Journal of Engineering, 2019, 41(1): 111-116. DOI: 10.13374/j.issn2095-9389.2019.01.012
    Citation: WANG Yu-dong, YANG Kai, ZHANG Ming-jie, LI Jian-ling, GAO Fei, LIU Hao, GENG Meng-meng. Fabrication of hollow lithium titanate material by electrospinning[J]. Chinese Journal of Engineering, 2019, 41(1): 111-116. DOI: 10.13374/j.issn2095-9389.2019.01.012

    靜電紡絲法制備空心鈦酸鋰材料

    Fabrication of hollow lithium titanate material by electrospinning

    • 摘要: 為進一步提升鈦酸鋰材料的性能, 本文在傳統靜電紡絲技術的基礎上, 將紡絲噴頭改進成內外嵌套的同軸噴頭, 以兩種溶液的形式進行同軸共紡, 得到了具有空心結構的鈦酸鋰纖維絲.將其與傳統靜電紡絲法制備的實心結構鈦酸鋰纖維絲進行對比, 結果表明: 空心鈦酸鋰材料粒度均一、無團聚現象, 材料具有明顯的空心結構, 結晶性能良好, 比表面積是實心結構的1.3倍.形貌結構的改善極大地提高了空心鈦酸鋰材料的電化學性能, 表現為小倍率下二者的放電比容量接近理論比容量, 但在20C倍率下空心結構的鈦酸鋰材料優于實心鈦酸鋰, 仍可達到130 mA·h·g-1, 循環200周后容量保持率仍達98%, 具有良好的穩定性; 循環伏安和交流阻抗曲線也表明: 空心結構使得鈦酸鋰材料的極化程度減少, 電化學反應阻抗降低, 更有利于電化學反應的進行.

       

      Abstract: Lithium titanate (Li4Ti5O12, LTO) is an important material to be used as an anode for LIBs (Li+ ion battery). LTO is a zero-strain material (i.e., no structural change occurs during Li insertion/extraction). Although LTO is a very safe material that can be used as an anode material in high and low temperature environment, its rate capability is compromised by its low electronic conductivity and poor Li+ diffusion coefficient. In the recent years, considerable research around the world has focused on improving LTO rate performance. Efforts to achieve better electrical conduction between LTO particles have included LTO particle size control, conductive-material surface coatings, and alien ion doping. However, in this study electrochemical properties were improved by changing the morphology of LTO. Based on traditional electrospinning technology, LTO fibers with a hollow structure were produced using a nested coaxial nozzle modified from the conventional spinning nozzle and coaxial cospinning with two different solutions. A comparison of this results with those of solid LTO prepared by traditional electrospinning technology demonstrates that hollow LTO is characterized by uniform particle size and no agglomeration, along with an obvious hollow structure, clear crystal lattice stripes, and good crystallization property. The specific surface of this hollow LTO is 1.3 times than its solid counterpart. This morphological change greatly improves the electrochemical performance of the material. Although the discharge specific capacities of both the solid and hollow LTO are close to the theoretical value for small ratios, the hollow LTO is superior to its solid counterpart at 20C. The discharge specific capacity of the hollow LTO can reach 130 mA·h·g-1 at 20C, and after 200 cycles, its capacity retention ratio remains at 98%, which suggests good stability. Cyclic voltammetry and AC impedance curves also show that the hollow structure reduces the degree of polarization and the electrochemical reaction impedance of LTO, which makes LTO more conducive to electrochemical reaction.

       

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