College of Mechanical and Electronic Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, China.
College of Mechanical and Electronic Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, China.
Int J Biol Macromol. 2024 Oct;277(Pt 3):134474. doi: 10.1016/j.ijbiomac.2024.134474. Epub 2024 Aug 3.
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, 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 at 0.5 A g and the maximum energy density of 17.04 W h kg. 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 at 0.5 A g and the maximum energy and power densities of 24.24 W h kg and 5023 W kg, respectively. This study proposes a promising approach for sustainable utilization of lignin in energy storage applications.
由于其环保特性，天然生物聚合物木质素的需求日益增加，而用于超级电容器的具有高导电性和可靠耐久性的木质素基电解质仍然具有挑战性。在此，通过化学交联反应提出了一种制备木质素纳米颗粒（LNPs）基固体电解质薄膜（LF）的简便方法。所制备的 LF 具有独特的海绵状多孔结构，离子电导率为 3.26 mS cm，表现出优异的柔韧性和良好的机械性能。此外，首次使用 LF 电解质和 LCA 电极组装了全 LNPs 基对称超级电容器（SSC）器件，证实 LF3 电解质在电容性能方面优于商用纤维素分离器。该 SSC 器件在 0.5 A g 时的比电容为 122.7 F g，最大能量密度为 17.04 W h kg。此外，海藻酸钠（SA）的加入显著提高了 SA/LF3 电解质的离子电导率，所得 SSC 器件在 0.5 A g 时的比电容为 174.5 F g，最大能量和功率密度分别为 24.24 W h kg 和 5023 W kg。本研究为木质素在储能应用中的可持续利用提出了一种有前途的方法。
