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与锂离子电池三元正极材料相比，磷酸铁锂(LiFePO4,LFP)正极材料具有结构稳定、不易发生安全事故等优点，在商业锂离子电池中得到了广泛应用，如何进一步提高LFP的电化学性能是目前锂离子电池研究领域的热点问题。本文采用物理涂覆的方法，在锂离子电池正极材料铝箔集流体的表面涂覆了一层乙炔黑膜，形成了一种新型的集流体，之后以此集流体组装LFP电极，进行电化学测试。结果显示，在0.1 C倍率下使用此集流体的LFP电极的首次放电比容量为217 mAh/g，远高于传统LFP电极的容量(165 mAh/g)。使用此集流体的LFP在10 C倍率下循环100圈后的放电比容量为76 mAh/g，较传统LFP(58 mAh/g)提高约30%；在20 C倍率下循环500圈后的放电比容量为38 mAh/g，较传统LFP(27 mAh/g)提高约40%。本文在利用恒流充放电、循环伏安和交流阻抗等技术对电极的电化学行为进行研究的基础上，还利用XRD、SEM、FTIR等技术对高倍率长循环前后的样品进行了测试表征。结果表明，使用乙炔黑膜修饰铝箔可降低LFP的电荷传递电阻，并显著抑制高倍率长循环过程中铝箔腐蚀的发生。本工作具有易规模化商业生产的特点，为基于磷酸铁锂商业锂离子电池性能的提高提供了新思路。
Abstract：As compared to the ternary cathode materials of lithium ions batteries(LIBs), the advantages of relatively stable structure and low risk of safety accident endowed lithium iron phosphate(LiFePO4, abbreviated as LFP) a wide application in the field of LIBs. How to further develop the electrochemical performance of LFP has become a hot topic in the research field of LIBs. In the present work, a physical coating method was used to apply acetylene black on the surface of the commercial current collector of aluminum foil forming a novel kind of current collector. Subsequently, the as-prepared current collector was used to prepare LFP electrode generating an acetylene black membrane coated Al foil supported LFP electrode. It was revealed that the initial discharge capacity of the newly prepared LFP was as high as 217 mAh/g, significantly higher than that of the conventional LFP electrode(165 mAh/g). The discharge capacity of the new LFP electrode at 10 C after 100 cycles was 76 mAh/g, showing an increase of about 30% compared to that of the conventional LFP electrode(58 mAh/g). At 20 C after 500 cycles, the discharge capacity of the new LFP electrode was still as high as 38 mAh/g, presenting an increase of about 40% compared to that of the conventional LFP electrode(27 mAh/g). In this work, the techniques of galvanostatic chargedischarge(GCD), cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS) were all employed to systematically study the electrochemical performance of the studied electrodes. And, XRD(X-ray diffraction), SEM(scanning electron microscopy) and FTIR(Fourier transform infrared spectroscopy) were used to characterize the studied samples before and after the high rate long-term experiments. The greatly reduced charge transfer resistance of LFP electrode as well as the evidently inhibited corrosion process of Al foil was analyzed to be the main contributions of the newly formed acetylene black membrane providing LFP a satisfactory high rate performance. The feature of easy large-scale commercial production made the present work very meaningful to the further development of the LFP-based LIBs.
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基本信息:
DOI：10.19996/j.cnki.ChinBatlnd.2025.05.005
中图分类号:TM912;TB306
引用信息:
[1]白颖,李孟娇,赵棉,等.乙炔黑膜对商业磷酸铁锂性能的影响[J].电池工业,2025,29(05):367-373+381.DOI:10.19996/j.cnki.ChinBatlnd.2025.05.005.
基金信息:
河北省自然科学基金（B2024205035）; 河北省创新能力提升计划（225A4402D;22567604H）