刘春花. Sb2Se3/TiO2/C纳米纤维负极的静电纺丝制备及其在锂离子电池中的应用[J]. 工程科学学报, 2024, 46(11): 2026-2035. DOI: 10.13374/j.issn2095-9389.2024.02.07.001
引用本文: 刘春花. Sb2Se3/TiO2/C纳米纤维负极的静电纺丝制备及其在锂离子电池中的应用[J]. 工程科学学报, 2024, 46(11): 2026-2035. DOI: 10.13374/j.issn2095-9389.2024.02.07.001
LIU Chunhua. Electrospinning preparation of Sb2Se3/TiO2/C nanofiber anode and its application in lithium-ion batteries[J]. Chinese Journal of Engineering, 2024, 46(11): 2026-2035. DOI: 10.13374/j.issn2095-9389.2024.02.07.001
Citation: LIU Chunhua. Electrospinning preparation of Sb2Se3/TiO2/C nanofiber anode and its application in lithium-ion batteries[J]. Chinese Journal of Engineering, 2024, 46(11): 2026-2035. DOI: 10.13374/j.issn2095-9389.2024.02.07.001

Sb2Se3/TiO2/C纳米纤维负极的静电纺丝制备及其在锂离子电池中的应用

Electrospinning preparation of Sb2Se3/TiO2/C nanofiber anode and its application in lithium-ion batteries

  • 摘要: 以钛酸异丙酯(TTIP)为偶联剂,利用静电纺丝技术合成了一种具有优异机械柔性的Sb2Se3/TiO2/C纳米纤维膜. 这种纳米纤维膜能够承受180°的弯曲或折叠,且没有任何破损的痕迹. 将这种Sb2Se3/TiO2/C纳米纤维膜作为自支撑的柔性负极,在扣式半电池和全电池中研究了其电化学性能. 半电池电化学性能测试结果显示,Sb2Se3/TiO2/C纳米纤维膜具有优异的倍率性能和循环性能,这种Sb2Se3/TiO2/C纳米纤维膜在50 mA·g−1的电流密度下获得了470.1 mA·h·g−1的首次可逆容量,经过100次循环后其容保持率为86.1%,远高于商用Sb2Se3负极材料. 另外,全电池电化学性能测试结果进一步证实了这种柔性Sb2Se3/TiO2/C纳米纤维膜拥有优异的电化学性能,具有实际应用潜力. 结合各种实验表征,证实了柔性Sb2Se3/TiO2/C纳米纤维膜强大的机械柔韧性和独特的纳米纤维导电网络共同促成了其优异的电化学性能.

     

    Abstract: In the current era of rapid scientific and technological development, flexible electronics and wearable devices have emerged as a trend, leading the way in fashion. These devices require flexible batteries to power them. The mechanical flexibility of electrodes is crucial in determining whether flexible batteries can withstand repeated folding or bending. Electrospinning is a simple and effective method for preparing flexible electrodes for lithium-ion batteries. In this context, a flexible Sb2Se3/TiO2/C nanofiber membrane was synthesized using electrospinning technology, with titanium isopropoxide (TTIP) serving as a coupling agent to enhance its mechanical flexibility. The synthesized flexible Sb2Se3/TiO2/C nanofiber membrane can withstand 180° bending and folding; it has been folded 50 times at 180° without any signs of breakage. To assess the electrochemical performance of the flexible Sb2Se3/TiO2/C nanofiber, we employed it as a freestanding anode. The electrochemical performance of the Sb2Se3/TiO2/C nanofiber membrane anode was thoroughly investigated in both Li half-cells and Li full-cells. Performance testing of the half-cell demonstrated the superior rate capability and cycling performance of the Sb2Se3/TiO2/C nanofiber membrane. At a current density of 50 mA·g−1, the membrane achieved an initial reversible capacity of 470.1 mA·h·g−1, with a capacity retention rate of 86.1% after 100 cycles. The electrochemical performance of the Sb2Se3/TiO2/C nanofiber membrane far surpassed that of the commercial bulk Sb2Se3 anode. Rate capabilities were investigated at current densities of 50, 100, 200, 400, 600, 800, and 1000 mA·g−1, within a test voltage range from 0.01 to 2.5 V. Cycling performance testing was conducted at 50 mA·g−1 with a test potential range of 0.01–2.5 V. The high Li+ transport capability of the Sb2Se3/TiO2/C nanofiber membrane contributed to its excellent electrochemical performance. Additionally, the electrochemical performance of a full battery assembled with a freestanding Sb2Se3/TiO2/C nanofiber anode and LiNi0.88Co0.06Mn0.06O2 cathode was tested at a current density of 50 mA·g−1, with a voltage range of 1.0–4.3 V. Full cell tests confirmed the excellent electrochemical properties of the flexible Sb2Se3/TiO2/C nanofiber membrane, demonstrating its potential for practical applications. The combination of its impressive mechanical flexibility and unique nanofiber conductive network contributed significantly to its outstanding electrochemical performance. Through various experimental characterizations, we demonstrated that the robust mechanical flexibility and distinctive nanofiber conductive network of the flexible Sb2Se3/TiO2/C nanofiber membrane collectively enhanced its electrochemical capabilities.

     

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