【摘要】 如何在保持导电剂总体含量不变的前提下提升电池性能是学术界和产业界共同面临的难题。目前电极制作采用均匀分布的方式没有考虑分布差异性的影响。通过在磷酸铁锂(LiFePO4)电极片制作过程中采用双层涂布浆料的方式，使导电剂含量从集流体到隔膜方向上呈梯度化分布。采用恒流恒压循环实验、倍率性能实验、交流阻抗实验、循环伏安实验和扫描电镜测试，研究了导电剂梯度化分布对锂离子电池性能的影响。结果表明：靠近集流体一侧导电剂含量为9%(质量分数)的样品和没有梯度化的样品，初始比容量分别为154.1和149.3 mAh/g，电荷转移阻抗分别为184.8和384.4Ω，说明前者的性能较后者有一定程度的提升。更多还原

【Abstract】 How to improve the battery performance while keeping the overall content of the conductive agent unchanged is a common problem faced by both academia and industry. At present, the electrode fabrication adopts a uniform distribution method without considering the influence of distribution differences. In this paper, the conductive agent content is distributed in a gradient from the current collector to the separator by using a doublelayer coating slurry during the fabrication of lithium iron phosphate(LiFePO4) electrode sheets. The effects of the gradient distribution of conductive agent on the performance of lithium ion batteries were studied by constant current and constant voltage cycling experiments, rate performance experiments, AC impedance experiments, cyclic voltammetry curve experiments and scanning electron microscopy tests. The results show that the initial specific capacities of the sample with 9% of conductive agent near the collector side and the sample without gradient are 154.1and 149.3 mAh/g, respectively, and the charge transfer impedance is 184.8 and 384.4 Ω, respectively, indicating that the performance of the former is improved to a certain extent compared with the latter.更多还原