Gong Zongshuai, Zheng Silin, Zhang Jin, Duan Yueqin, Luo Zhiqiang, Cai Fengshi, Yuan Zhihao
Tianjin Key Lab for Photoelectric Materials & Devices, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin 300071, China.
ACS Appl Mater Interfaces. 2022 Mar 9;14(9):11474-11482. doi: 10.1021/acsami.1c23962. Epub 2022 Feb 25.
Li-organic batteries (LOBs) are promising advanced battery systems because of their unique advantages in capacity, cost, and sustainability. However, the shuttling effect of soluble organic redox intermediates and the intrinsic dissolution of small-molecular electrodes have hindered the practical application of these cells, especially under high operating temperatures. Herein, a cross-linked membrane with abundant negative charge for high-temperature LOBs is prepared via electrospinning of poly(vinyl alcohol) containing halloysite nanotubes (HNTs). The translocation of negatively charged organic intermediates can be suppressed by the electronic repulsion and the cross-linked network while the positively charged Li are maintained, which is attributed to the intrinsic electronegativity of HNTs and their well-organized and homogeneous distribution in the PVA matrix. A battery using a PVA/HNT composite separator (EPH-10) and an anthraquinone (AQ) cathode exhibits a high initial discharge capacity of 231.6 mAh g and an excellent cycling performance (91.4% capacity retention, 300 cycles) at 25 °C. Even at high temperatures (60 and 80 °C), its capacity retention is more than 89.2 and 80.4% after 100 cycles, respectively. Our approach demonstrates the potential of the EPH-10 composite membrane as a separator for high-temperature LOB applications.
锂有机电池（LOBs）因其在容量、成本和可持续性方面的独特优势，是很有前景的先进电池系统。然而，可溶性有机氧化还原中间体的穿梭效应和小分子电极的固有溶解阻碍了这些电池的实际应用，尤其是在高温操作条件下。在此，通过静电纺丝含埃洛石纳米管（HNTs）的聚乙烯醇制备了一种用于高温LOBs的带有大量负电荷的交联膜。带负电荷的有机中间体的迁移可以通过电子排斥和交联网络来抑制，同时保持带正电荷的锂，这归因于HNTs的固有电负性及其在聚乙烯醇基质中良好有序且均匀的分布。使用聚乙烯醇/埃洛石纳米管复合隔膜（EPH - 10）和蒽醌（AQ）阴极的电池在25℃时表现出231.6 mAh g的高初始放电容量和优异的循环性能（容量保持率91.4%，300次循环）。即使在高温（60和80℃）下，100次循环后其容量保持率分别超过89.2%和80.4%。我们的方法证明了EPH - 10复合膜作为高温LOB应用隔膜的潜力。
