Tailoring Sodium Carboxymethylcellulose Binders for High‐Voltage LiCoO 2 via Thermal Pulse Sintering

作者：Shiming Chen, Hengyao Zhu, Jiangxiao Li, Zu‐Wei Yin, Taowen Chen, Xiangming Yao, Wenguang Zhao, Haoyu Xue, Xin Jiang, Yongsheng Li, Hengyu Ren, Jun Chen, Jun‐Tao Li, Luyi Yang, Feng Pan · 发表于：Angewandte Chemie International Edition · 年份：2025 · DOI：10.1002/anie.202423796 · 被引用次数：21 · 研究领域：Fiber-reinforced polymer composites、Advancements in Battery Materials、Recycling and Waste Management Techniques

Abstract Polyvinylidene fluoride (PVDF), as the commercial cathode binder for lithium‐ion batteries, presents several practical challenges, including insufficient conductivity, weak adhesion to active materials, and the use of toxic N‐methylpyrrolidone for slurry preparation. However, while most water‐soluble binders can address the aforementioned issues, they fail to meet the requirements of high‐voltage cathodes. In this work, we innovatively employed a thermal pulse sintering strategy to modify carboxymethyl cellulose sodium (CMC), enabling their application in 4.6 V LiCoO 2 (93 % capacity retention after 200 cycles). This strategy facilitates the decomposition of electrochemically active carboxyl groups, leading to ring opening reactions that generate numerous ether linkages (‐C−O−C‐) without introducing undesirable side effects on LiCoO 2 . The resulting components form additional charge carrier (i.e., Li + and e − ) pathways on the cathode surface. Additionally, the heating process also promotes uniform coating of the binder on the surface of LiCoO 2 , creating a protective layer that inhibits interfacial side reactions. Through proposing a scalable and economic manufacturing technology of multifunctional binder, this work enlightens the avenues for practical high‐energy‐density batteries.