Investigation of an eco-friendly polyacrylic acid binder system on LiFePO4 cathode electrode processing to enhance the performance of coin-cell and pouch-cell graphite||LiFePO4 batteries

Energy Storage Pub Date : 2024-08-06 DOI:10.1002/est2.70006
Tram Tran Bich Vo, Minh Thu Nguyen, Thanh Liem Pham, Trung Thien Nguyen, Van Gia Tran, Van Man Tran, Phung My Loan Le
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Abstract

This study investigates the influence of two types of binders (aqueous and nonaqueous) on the LiFePO4 (LFP) electrode processing and its electrochemical properties. Specifically, polyvinylidene fluoride (PVDF) and polyacrylic acid (PAA) were dissolved in NMP (N-methyl-2-pyrrolidone) or the aqueous solvent (H2O) at varying mass ratios of 5%, 10%, and 15%. Binder durability and inertness were assessed by immersing prepared LFP electrodes in an electrolyte comprising 1.0 M LiPF6 in EC:DEC:DMC (1:1:1 in vol%). Notably, PVDF/NMP 10% and PAA/H2O 10%-based electrodes displayed good durability without peeling. Electrochemical characteristics were evaluated through cycling voltammetry and galvanostatic cycling with potential limitation. The PAA/H2O 10%-based-LFP electrode exhibited a specific capacity of ~148.9 mAh g−1 with a Coulombic efficiency (CE) of around 97.27%, surpassing PVDF/NMP 10%. The graphite||PAA/H2O 10%-based-LFP electrode in a full cell demonstrated higher capacity and superior retention after 30 cycles. In a pouch cell (6 cm × 4 cm), utilizing graphite||LFP with PAA/H2O 10%, a capacity of 25.5 mAh was achieved, maintaining 93% capacity with a CE of about 99% after 30 cycles at a rate of 0.1C.

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研究环保型聚丙烯酸粘合剂系统对磷酸铁锂电池正极电极的处理,以提高纽扣电池和袋式电池石墨||磷酸铁锂电池的性能
本研究探讨了两种粘合剂(水性和非水性)对磷酸铁锂(LFP)电极加工及其电化学特性的影响。具体来说,聚偏二氟乙烯(PVDF)和聚丙烯酸(PAA)以 5%、10% 和 15%的不同质量比溶解在 NMP(N-甲基-2-吡咯烷酮)或水性溶剂(H2O)中。将制备好的 LFP 电极浸入由 1.0 M LiPF6 和 EC:DEC:DMC (体积比为 1:1:1)组成的电解液中,对粘合剂的耐久性和惰性进行了评估。值得注意的是,基于 PVDF/NMP 10% 和 PAA/H2O 10% 的电极显示出良好的耐久性,没有剥落。电化学特性通过循环伏安法和电位限制电位静态循环法进行了评估。基于 PAA/H2O 10% 的 LFP 电极的比容量约为 148.9 mAh g-1,库仑效率(CE)约为 97.27%,超过了 PVDF/NMP 10% 电极。在全电池中,基于石墨||PAA/H2O 10%的 LFP 电极在 30 次循环后显示出更高的容量和优异的保持能力。在一个小袋电池(6 cm × 4 cm)中,使用 PAA/H2O 10% 的石墨||LFP,实现了 25.5 mAh 的容量,在 0.1C 速率下循环 30 次后,容量保持率为 93%,CE 约为 99%。
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