State Key Laboratory of Biobased Material and Green Papermaking, Key Laboratory of Pulp & Paper Science and Technology of Shandong Province/Ministry of Education, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China.
State Key Laboratory of Biobased Material and Green Papermaking, Key Laboratory of Pulp & Paper Science and Technology of Shandong Province/Ministry of Education, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China; Department of Chemical Engineering, Lakehead University, 955 Oliver Road, Thunder Bay, ON P7B 5E1, Canada.
Int J Biol Macromol. 2024 Jul;273(Pt 2):132640. doi: 10.1016/j.ijbiomac.2024.132640. Epub 2024 May 31.
The high energy density and robust cycle properties of lithium-ion batteries contribute to their extensive range of applications. Polyolefin separators are often used for the purpose of storing electrolytes, hence ensuring the efficient internal ion transport. Nevertheless, the electrochemical performance of lithium-ion batteries is constrained by its limited interaction with electrolytes and poor capacity for cation transport. This work presents the preparation of a new bio-based nanofiber separator by combining oxidized lignin (OL) and halloysite nanotubes (HNTs) with polyimide (PI) using an electrospinning technique. Analysis was conducted to examine and compare the structure, morphology, thermal characteristics, and EIS of the separator with those of commercially available polypropylene separator (PP). The results indicate that the PI@OL and PI-OL@ 10 % HNTs separators exhibit higher lithium ion transference number and ionic conductivity. Moreover, the use of HNTs successfully impeded the proliferation of lithium dendrites, hence exerting a beneficial impact on both the cycle performance and multiplier performance of the battery. Consequently, after undergoing 300 iterations, the battery capacity of LiFePO|PI-OL@ 10 % HNTs|Li stays at 92.1 %, surpassing that of PP (86.8 %) and PI@OL (89.6 %). These findings indicate that this new bio-based battery separator (PI-OL@HNTs) has the great potential to serve as a substitute for the commonly used PP separator in lithium metal batteries.
锂离子电池具有高能量密度和稳健的循环性能，这使得它们得到了广泛的应用。聚烯烃隔膜常用于储存电解质，从而确保有效的内部离子传输。然而，锂离子电池的电化学性能受到其与电解质有限的相互作用和阳离子传输能力差的限制。本工作通过静电纺丝技术，将氧化木质素（OL）和埃洛石纳米管（HNTs）与聚酰亚胺（PI）结合，制备了一种新型的生物基纳米纤维隔膜。对隔膜的结构、形貌、热特性和交流阻抗（EIS）进行了分析，并与市售的聚丙烯隔膜（PP）进行了比较。结果表明，PI@OL 和 PI-OL@10%HNTs 隔膜具有更高的锂离子迁移数和离子电导率。此外，HNTs 的使用成功地阻止了锂枝晶的生长，从而对电池的循环性能和倍率性能都产生了有益的影响。因此，在经过 300 次循环后，LiFePO|PI-OL@10%HNTs|Li 电池的容量保持在 92.1%，超过了 PP（86.8%）和 PI@OL（89.6%）。这些结果表明，这种新型的生物基电池隔膜（PI-OL@HNTs）具有替代锂离子电池中常用的 PP 隔膜的巨大潜力。
