Department of Chemical and Biomolecular Engineering, Yonsei University, Seodaemun-gu, Seoul 03722, Republic of Korea.
Nat Commun. 2023 Mar 10;14(1):1316. doi: 10.1038/s41467-023-37009-7.
The current lithium-ion battery (LIB) electrode fabrication process relies heavily on the wet coating process, which uses the environmentally harmful and toxic N-methyl-2-pyrrolidone (NMP) solvent. In addition to being unsustainable, the use of this expensive organic solvent substantially increases the cost of battery production, as it needs to be dried and recycled throughout the manufacturing process. Herein, we report an industrially viable and sustainable dry press-coating process that uses the combination of multiwalled carbon nanotubes (MWNTs) and polyvinylidene fluoride (PVDF) as a dry powder composite and etched Al foil as a current collector. Notably, the mechanical strength and performance of the fabricated LiNiCoMnO (NCM712) dry press-coated electrodes (DPCEs) far exceed those of conventional slurry-coated electrodes (SCEs) and give rise to high loading (100 mg cm, 17.6 mAh cm) with impressive specific energy and volumetric energy density of 360 Wh kg and 701 Wh L, respectively.
当前的锂离子电池（LIB）电极制造工艺严重依赖于湿涂层工艺，该工艺使用对环境有害且有毒的 N-甲基-2-吡咯烷酮（NMP）溶剂。除了不可持续之外，这种昂贵有机溶剂的使用还大大增加了电池生产成本，因为在整个制造过程中都需要对其进行干燥和回收。在此，我们报告了一种工业上可行且可持续的干式压片涂层工艺，该工艺使用多壁碳纳米管（MWNTs）和聚偏二氟乙烯（PVDF）的组合作为干粉复合材料，并使用蚀刻的铝箔作为集流器。值得注意的是，所制备的 LiNiCoMnO（NCM712）干式压片涂层电极（DPCE）的机械强度和性能远远超过传统的浆料涂层电极（SCE），并实现了高负载（100mg cm，17.6mAh cm），具有令人印象深刻的比能量和比能量密度分别为 360 Wh kg 和 701 Wh L。
