用于无PFAS、高负载锂离子电池正极的电荷工程化纤维素纳米纤丝粘结剂
Charge-engineered cellulose nanofibril binders for PFAS-free, high-loading lithium battery positive electrodes.
摘要(中文译文)
对可持续高能锂离子电池日益增长的需求，加剧了人们对当前电池组件中所使用的全氟和多氟烷基物质（PFAS）的环境与健康影响的担忧。特别是，聚偏氟乙烯（PVDF）作为一种合成树脂，是目前主要的电极黏结剂，其依赖氟化化学品和N-甲基-2-吡咯烷酮（NMP）等有毒溶剂，同时在高面载量条件下还存在结构完整性有限的问题。在此，我们展示了一种基于源自天然木材的电荷工程化纤维素纳米纤丝（CNF）的无PFAS、无NMP黏结剂，可作为聚偏氟乙烯的可再生且可持续的替代方案。该电荷工程化纤维素纳米纤丝黏结剂利用其阳离子官能团，通过静电排斥促进浆料中的颗粒分散，并在干燥后与电极组分形成强氢键，从而增强结构完整性。此外，其纳米纤维结构形成坚固的互连网络，有利于电解液浸润和离子传输。当应用于LiNiCoMnO正极时，该黏结剂可实现113 mg cm的质量负载和3.65 g cm的电极密度，在0.05 C（相当于1.13 mA cm）下达到22.5 mAh cm的面容量和1781.5 Wh L的体积能量密度，展现出相对于基于传统合成聚合物黏结剂的电极具有竞争力的电池性能。此外，该电荷工程化纤维素纳米纤丝黏结剂可实现无N-甲基-2-吡咯烷酮的浆料加工，降低电极制造的环境足迹。
Abstract
The increasing demand for sustainable high-energy lithium-ion batteries has heightened concerns over the environmental and health impacts of per- and polyfluoroalkyl substances, used in current battery components. In particular, polyvinylidene fluoride, a synthetic resin used as the dominant electrode binder, relies on fluorinated chemicals and toxic solvents such as N-methyl-2-pyrrolidone, while also suffering from limited structural integrity under high-mass-loading conditions. Here, we show that a PFAS- and N-methyl-2-pyrrolidone-free binder based on charge-engineered cellulose nanofibrils derived from natural wood offers a renewable and sustainable alternative to polyvinylidene fluoride. The charge-engineered cellulose nanofibril binder, leveraging its cationic functional groups, promotes particle dispersion in the slurry through electrostatic repulsion and subsequently forms strong hydrogen bonds with electrode components after drying, reinforcing structural integrity. Additionally, its nanofibrous architecture forms robust, interconnected networks that facilitate electrolyte infiltration and ion transport. When implemented in LiNiCoMnO positive electrodes, this binder enables a mass loading of 113 mg cm and an electrode density of 3.65 g cm, achieving an areal capacity of 22.5 mAh cm and a volumetric energy density of 1781.5 Wh L at 0.05 C (corresponding to 1.13 mA cm), demonstrating competitive cell performance relative to electrodes based on conventional synthetic polymer binders. Moreover, the charge-engineered cellulose nanofibril binder enables N-methyl-2-pyrrolidone-free slurry processing, reducing the environmental footprint of electrode fabrication.
如何引用
AMA
Sang-Woo Kim, Nag-Young Kim, Anseong Park, Jinho Ha, Cheol Bak, Yoojin Kim, et al. Charge-engineered cellulose nanofibril binders for PFAS-free, high-loading lithium battery positive electrodes.. Nature communications. 2026; doi:10.1038/s41467-026-73909-0.
APA
Sang-Woo Kim, Nag-Young Kim, Anseong Park, Jinho Ha, Cheol Bak, Yoojin Kim, et al (2026). Charge-engineered cellulose nanofibril binders for PFAS-free, high-loading lithium battery positive electrodes.. Nature communications. https://doi.org/10.1038/s41467-026-73909-0
GB/T 7714
Sang-Woo Kim, Nag-Young Kim, Anseong Park, Jinho Ha, Cheol Bak, Yoojin Kim, et al. Charge-engineered cellulose nanofibril binders for PFAS-free, high-loading lithium battery positive electrodes.[J]. Nature communications, 2026 doi:10.1038/s41467-026-73909-0.
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