锂离子电池是实现可持续运输和可再生能源的关键技术。目前锂离子电池面临的挑战包括能量以及功率密度较低、寿命较短和成本较高。对于以上问题，可通过增加活性材料层的厚度来提高电池的能量密度。然而，这降低了锂离子在电池内部的传输速率，而且提高电极层的厚度会带来电解质分布的不均匀性，从而导致电极内活性材料的利用率低。这可以通过调整孔径分布来解决。在电极层与隔膜处具有较高孔隙率、在电极层与集流体处具有较低孔隙率的梯度孔隙率的孔径分布可以有效改善锂离子传输速率和提高活性材料的利用率。本论文的目的是验证是否可以通过在浆料涂布之后将浆料中的溶剂喷涂到图层的表面上来制造连续的梯度孔隙分布。因此，在清华大学和中信国安盟固利科技有限公司进行了多次实验。通过尝试不同剂量的溶剂喷涂量，干燥加热时间来验证方法的可行性，并采用SEM图像来确定电极横截面上的孔隙率分布。研究表明，采用该方法可以实现连续的梯度孔隙率分布。大多数样品的测试结果表明该方法得到的孔隙率分布趋向于所需的梯度孔隙度。然而，由于加热条件控制不佳的原因，导致部分结果出现了较为反常的现象。这项研究为制备孔隙率连续地梯度化分布的电极层提供了一个新的思路。

Li-ion batteries are a key technology to enable a successful transition towards sustainable transportation and renewable energy usage in the medium term. Current challenges of Li-ion batteries include limited energy and power density, low cycle stability and high cost.Several of those challenges can be addressed by increasing the thickness of the active material layer. However, this decelerates the lithium ion transport rates and induces poor utilization of the active material within electrodes due to inhomogeneous penetration of the electrolyte. This can be addressed by adjusting the pore size distribution. A gradient porosity with higher porosity in the upper part and lower porosity in the bottom part of the active material layer leads to an improved lithium ion transport rate and higher active material utilization.The purpose of this mini-thesis is to determine whether a continuous gradient porosity can be fabricated by means of applying a secondary processing fluid onto the surface of the wet electrode after coating. Therefore, several experiments have been carried out at Tsinghua University and at CITIC Guoan Mengguli Power Science & Technology Co., Ltd. Solvent, secondary processing fluid, time-to-oven and fluid amount has been varied in order to represent a variety of cases. SEM images have been taken to evaluate the gradient porosity across the electrodes’ cross section.The research indicates that a continuous gradient porosity can be achieved. The majority of the samples indicate a trend towards the desired gradient porosity. However, the irregularities and the small number of experiments do not allow a scientifically founded statement. This research serves as a first small view into the fabrication of a continuous gradient porosity.