Optimization of Si-PVDF Slurry Mixing and Electrode Fabrication Data for Enhanced Lithium-Ion Battery Performance

Description

In this study, we present data related to optimizing Si-PVdF slurry mixing and electrode fabrication techniques to enhance the performance of lithium-ion batteries. Three critical experimental conditions are documented in Tables 1, 2, and 3, corresponding to different stages of the research. Table 1 records data from an initial unsuccessful attempt, while Table 2 captures data from a subsequent trial that did not yield successful results. Figure 1(a) clearly depicts an unsuccessful endeavor in the slurry mixing process of Si-PVdF, utilizing a volume of 0.9 ml of NMP. The image presented exhibits notable visual characteristics that illustrate the difficulties encountered in attaining a uniform slurry, as evidenced by noticeable irregularities and accumulation within the mixture [3]. The proposed visual representation emphasizes the crucial significance of accurate quantity control of NMP (N-Methyl-2-pyrrolidone) and sheds light on the challenges encountered during the electrode fabrication process in this research phase [4]. Fig. 1(b) depicts an additional instance of an unsuccessful endeavor in the slurry mixing process of Si-PVdF, wherein 1.0 ml of NMP was employed. The sharp and detailed image captures the persistence of issues observed in Fig. 1(a), emphasizing the importance of optimizing the NMP concentration. This striking visual evidence accentuates the necessity for fine-tuning the formulation to overcome challenges and attain a consistent slurry mixture. Table 3, on the other hand, represents the outcome of a successful experiment. Each table provides information on the materials used, including Silicon (Si), Polyvinylidene fluoride (PVdF), Graphite (G), and N-methyl-2-pyrrolidone (NMP), along with their respective weights and proportions. Figure 1(c) represents a significant achievement in the research, illustrating the successful fabrication of Si-PVdF slurry following a crucial aging procedure [5]. The visual representation conveys a perception of achievement through its consistent and seamless surface quality, effectively demonstrating enhanced bonding between the slurry material and the copper foil. Additionally, the tables include electrode and copper foil weight measurements and active Si weight percentage values. The data in these tables highlight the critical role of NMP quantity and aging time in achieving a homogenous slurry and successful electrode fabrication. Notably, the successful experiment in Table 3 is marked by improved adhesion of the slurry material to the copper foil, preventing delamination. This dataset provides valuable insights into the optimization process for Si-PVdF electrode fabrication in lithium-ion batteries. It can serve as a reference for future research in battery materials science [9].

Steps to reproduce

Steps To Reproduce Materials Silicon (Si) High-purity silicon powder served as the primary active material in the anode. Its superior quality ensured the reliability and reproducibility of our experimental results. Polyvinylidene Fluoride (PVdF) PVdF, a binder material renowned for its adhesive properties, was chosen to bind the electrode components together effectively. Graphite (G) A high-grade graphite powder was used as a conductive additive to improve the electrical conductivity of the electrode. The graphite used in this study was obtained from MSE Supplies, located in the United States. Additionally, it accounted for 10% of the total weight of the slurry. N-Methyl-2-pyrrolidone (NMP) NMP, an analytically graded solvent, was chosen for preparing the electrode slurry. Its superior purity and solvent properties were vital to achieving a homogeneous, well-dispersed slurry. This solvent was obtained from Sigma Aldrich. Copper Foil Copper foils, with a thickness of 10 were chosen as the substrate for fabricating the silicon-based anodes. These high-quality foils were obtained from Targray, inc., and provided a stable platform for electrode construction. Slurry Preparation and Aging Initial Slurry Preparation In the first step of slurry preparation, PVdF and NMP were meticulously mixed using a precision speed mixer (Model: DAC 400.2 VAC-P) in specific proportions. Two distinct formulations were investigated, differing in NMP volume (1.0 ml and 0.9 ml). This mixing process underwent multiple cycles with durations of 01:00, 01:00, and 04:00, ensuring thorough dispersion and uniformity. Aging An aging step was used to increase the homogeneity of the PVdF-NMP solution. The slurry was left to age at room temperature overnight. This process fostered stronger intermolecular bonds between the slurry's constituents, contributing to the overall stability and performance of the electrode. Incorporation of Active Materials Silicon and graphite were meticulously introduced into the PVdF-NMP solution after the aging process. Subsequent speed mixing guaranteed a consistent and homogeneous distribution of the active materials within the slurry. The slurry was then subjected to another day of aging at room temperature to fortify the bonding between the PVdF binder and the silicon particles, enhancing electrode cohesion. Electrode Fabrication Slurry Coating After two days of Aging, the slurry reached the optimal condition for fabricating electrodes. The slurry was applied uniformly to the copper foil substrate using a doctor blade for a comparable coating technique. Drying and Solvent Evaporation The coated electrodes were carefully placed in a fume hood and allowed to dry at ambient room temperature. During this critical phase, the solvent (NMP) gradually evaporated, leaving an impeccably adhered electrode on the copper foil substrate. This method ensured the formation of a stable electrode structure.

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