Understanding Key NaCMC Properties to Optimize Electrodes and Battery Performance

IF 6.2 Q2 ENERGY & FUELS
Noah Keim, Andreas Weber, Marcus Müller, Ulrike Kaufmann, Werner Bauer, Oliver Petermann, Roland Bayer, Helmut Ehrenberg
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Abstract

This study examines the effects of sodium carboxymethyl cellulose (NaCMC) on the performance of graphite anodes in lithium-ion batteries, focusing on variations in degrees of substitution (DS), molecular weights (MW), and gel particles. The results indicate that the best electrochemical performance is achieved by balancing the residual water content introduced by NaCMC while maintaining the anode's volume resistivity. A NaCMC with a low molecular weight and DS of 0.7 shows the best results for this particular formulation. An impurity (in batteries yet unreported)in NaCMC is also reported that significantly impacts electrochemical performance, called gel particles. By reducing the gel particles, cell performance is enhanced by 5%, without further optimization of the formulation. It is highlighted that both DS and MW influence electrode properties. A decrease in DS enhances adhesion but negatively affects volume resistivity. Increasing the MW improves adhesive strength and reduces interfacial resistivity due to greater chain entanglements. Higher gel particle levels negatively impact electrode properties, making low-gel NaCMC more effective for better adhesion and resistance. Water retention in electrodes again is influenced by both DS and MW. Higher DS leads to increased water retention due to greater hydrophilicity, while high MW contributes to this effect through enhanced entanglements.

Abstract Image

了解NaCMC的关键特性以优化电极和电池性能
本研究考察了羧甲基纤维素钠(NaCMC)对锂离子电池石墨阳极性能的影响,重点研究了取代度(DS)、分子量(MW)和凝胶颗粒的变化。结果表明,在保持阳极体积电阻率的同时,平衡NaCMC引入的残余含水量,可以获得最佳的电化学性能。低分子量、DS为0.7的NaCMC对该配方效果最好。据报道,NaCMC中的一种杂质(电池中尚未报道)也会显著影响电化学性能,称为凝胶颗粒。通过减少凝胶颗粒,无需进一步优化配方,细胞性能提高了5%。强调了DS和MW对电极性能的影响。DS的降低增强了附着力,但对体积电阻率有负面影响。增加分子量可以提高粘接强度,并降低由于链缠结增加而导致的界面电阻率。较高的凝胶颗粒水平会对电极性能产生负面影响,使低凝胶NaCMC更有效地具有更好的粘附性和电阻。电极中的保水率同样受到DS和MW的影响。更高的DS导致更高的亲水性,而高MW通过增强缠结来促进这种效果。
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来源期刊
CiteScore
8.20
自引率
3.40%
发文量
0
期刊介绍: Advanced Energy and Sustainability Research is an open access academic journal that focuses on publishing high-quality peer-reviewed research articles in the areas of energy harvesting, conversion, storage, distribution, applications, ecology, climate change, water and environmental sciences, and related societal impacts. The journal provides readers with free access to influential scientific research that has undergone rigorous peer review, a common feature of all journals in the Advanced series. In addition to original research articles, the journal publishes opinion, editorial and review articles designed to meet the needs of a broad readership interested in energy and sustainability science and related fields. In addition, Advanced Energy and Sustainability Research is indexed in several abstracting and indexing services, including: CAS: Chemical Abstracts Service (ACS) Directory of Open Access Journals (DOAJ) Emerging Sources Citation Index (Clarivate Analytics) INSPEC (IET) Web of Science (Clarivate Analytics).
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