Abstract：
Lignin as a natural biopolymer is becoming increasingly in demand due to its eco-friendly properties, while lignin-based electrolyte with high conductivity and reliable durability for applications in supercapacitors is still challenging. Herein, a facile method to prepare lignin nanoparticles (LNPs)-based solid electrolyte thin film (LF) was proposed through chemical cross-linking reaction. The fabricated LF exhibited a distinctive spongy porous structure with the ionic conductivity of 3.26 mS cm-1, demonstrating the exceptional flexibility and favorable mechanical properties. Moreover, the assembly of all-LNPs-based symmetric supercapacitor (SSC) devices was achieved using LF electrolyte and LCA electrodes for the first time, confirming the LF3 electrolyte superior to commercial cellulose separator in capacitive behaviour. This SSC device exhibited a specific capacitance of 122.7 F g-1 at 0.5 A g-1 and the maximum energy density of 17.04 W h kg-1. Furthermore, the incorporation of sodium alginate (SA) significantly enhanced the ionic conductivity of SA/LF3 electrolyte, and the resulting SSC device delivered a higher specific capacitance of 174.5 F g-1 at 0.5 A g-1 and the maximum energy and power densities of 24.24 W h kg-1 and 5023 W kg-1, respectively. This study proposes a promising approach for sustainable utilization of lignin in energy storage applications.
摘要：
木质素作为一种天然的生物聚合物正变得越来越需要由于其生态友好的性质，而具有高导电性和可靠耐久性的木质素基电解质在超级电容器中的应用仍然具有挑战性。在这里，提出了一种通过化学交联反应制备木质素纳米颗粒（LNPs）基固体电解质薄膜（LF）的简便方法。制造的LF表现出独特的海绵状多孔结构，离子电导率为3.26mScm-1，证明了出色的柔韧性和良好的机械性能。此外，首次使用LF电解质和LCA电极实现了基于全LNP的对称超级电容器（SSC）器件的组装，证实LF3电解质在电容性能方面优于商业纤维素隔膜。该SSC装置在0.5Ag-1时的比电容为122.7Fg-1，最大能量密度为17.04Whkg-1。此外，海藻酸钠(SA)的掺入显著提高了SA/LF3电解质的离子电导率,所得SSC装置在0.5Ag-1时提供了更高的比电容174.5Fg-1，最大能量和功率密度分别为24.24Whkg-1和5023Wkg-1。这项研究提出了一种在储能应用中可持续利用木质素的有前途的方法。
