Electrochemical and mechanical characterization of thermosets as fluorine-free cathode binders for Li-ion batteries

IF 3.5 3区工程技术 Q2 ENGINEERING, CHEMICAL

AIChE Journal Pub Date : 2024-08-27 DOI:10.1002/aic.18577

Shihao Pan, Maureen H. Tang, Nicolas J. Alvarez

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引用次数: 0

Abstract

This study demonstrates fluorine-free cross-linked (meth)acrylate polymers as alternatives to polyvinylidene fluoride (PVDF) in LiNi_0.33Mn_0.33Co_0.33O₂ (NMC111) cathodes. We determine the effects of thermal initiator content, polymer content, and curing environment for two polymer chemistries: a flexible acrylate polymer, and a stiff methacrylate polymer. Electrodes are manufactured and tested for final electrochemical performance and mechanical properties. The results show that the flexible acrylate polymer exhibits higher rate capability compared to the stiff methacrylate polymer because calendering fractures the brittle network of stiff polymer. Electrode adhesion to the current collector and cohesion between particles are found to be a strong function of thermal initiator ratio and oxygen inhibition. Furthermore, there exists an optimal binder concentration that maximizes rate capability performance. Under the right conditions, the two polymers exhibit comparable performance to PVDF electrodes. These results provide important implications for designing cross-linked polymers as cathode binder alternatives to PVDF.

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作为锂离子电池无氟阴极粘合剂的热固性塑料的电化学和机械特性分析

本研究证明了无氟交联（甲基）丙烯酸酯聚合物可替代聚偏二氟乙烯（PVDF）用于镍钴锰酸锂（NMC111）阴极。我们确定了热引发剂含量、聚合物含量和固化环境对两种聚合物化学成分的影响：一种是柔性丙烯酸酯聚合物，另一种是刚性甲基丙烯酸酯聚合物。电极已制造完成，并进行了最终电化学性能和机械性能测试。结果表明，与硬质甲基丙烯酸酯聚合物相比，柔性丙烯酸酯聚合物具有更高的速率能力，因为压延会使硬质聚合物的脆性网络断裂。研究发现，电极与集流器的附着力以及颗粒之间的内聚力与热引发剂比率和氧气抑制作用密切相关。此外，还存在一个最佳粘合剂浓度，可最大限度地提高速率能力性能。在适当的条件下，这两种聚合物的性能与 PVDF 电极相当。这些结果对设计交联聚合物作为 PVDF 阴极粘合剂替代品具有重要意义。

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来源期刊

AIChE Journal 工程技术-工程：化工

CiteScore

7.10

自引率

10.80%

发文量

411

审稿时长

3.6 months

期刊介绍： The AIChE Journal is the premier research monthly in chemical engineering and related fields. This peer-reviewed and broad-based journal reports on the most important and latest technological advances in core areas of chemical engineering as well as in other relevant engineering disciplines. To keep abreast with the progressive outlook of the profession, the Journal has been expanding the scope of its editorial contents to include such fast developing areas as biotechnology, electrochemical engineering, and environmental engineering. The AIChE Journal is indeed the global communications vehicle for the world-renowned researchers to exchange top-notch research findings with one another. Subscribing to the AIChE Journal is like having immediate access to nine topical journals in the field. Articles are categorized according to the following topical areas: Biomolecular Engineering, Bioengineering, Biochemicals, Biofuels, and Food Inorganic Materials: Synthesis and Processing Particle Technology and Fluidization Process Systems Engineering Reaction Engineering, Kinetics and Catalysis Separations: Materials, Devices and Processes Soft Materials: Synthesis, Processing and Products Thermodynamics and Molecular-Scale Phenomena Transport Phenomena and Fluid Mechanics.