Lou Rui, Zhang Guocheng, Niu Taoyuan, He Long, Su Ying, Wei Guodong
College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
Materials Institute of Atomic and Molecular Science, Shaanxi University of Science and Technology, Xi'an 710021, China.
Polymers (Basel). 2024 Sep 30;16(19):2772. doi: 10.3390/polym16192772.
Solid-state electrolytes have received widespread attention for solving the problem of the leakage of liquid electrolytes and effectively improving the overall performance of supercapacitors. However, the electrochemical performance and environmental friendliness of solid-state electrolytes still need to be further improved. Here, a binary biomass-based solid electrolyte film (LSE) was successfully synthesized through the incorporation of lignin nanoparticles (LNPs) with sodium alginate (SA). The impact of the mass ratio of SA to LNPs on the microstructure, porosity, electrolyte absorption capacity, ionic conductivity, and electrochemical properties of the LSE was thoroughly investigated. The results indicated that as the proportion of SA increased from 5% to 15% of LNPs, the pore structure of the LSE became increasingly uniform and abundant. Consequently, enhancements were observed in porosity, liquid absorption capacity, ionic conductivity, and overall electrochemical performance. Notably, at an SA amount of 15% of LNPs, the ionic conductivity of the resultant LSE-15 was recorded at 14.10 mS cm, with the porosity and liquid absorption capacity reaching 58.4% and 308%, respectively. LSE-15 was employed as a solid electrolyte, while LNP-based carbon aerogel (LCA) served as the two electrodes in the construction of a symmetric all-solid-state supercapacitor (SSC). The SSC device demonstrated exceptional electrochemical storage capacity, achieving a specific capacitance of 197 F g at 0.5 A g, along with a maximum energy and power density of 27.33 W h kg and 4998 W kg, respectively. Furthermore, the SSC device exhibited highly stable electrochemical performance under extreme conditions, including compression, bending, and both series and parallel connections. Therefore, the development and application of binary biomass-based solid electrolyte films in supercapacitors represent a promising strategy for harnessing high-value biomass resources in the field of energy storage.
固态电解质因解决了液体电解质泄漏问题并有效提升超级电容器的整体性能而受到广泛关注。然而，固态电解质的电化学性能和环境友好性仍有待进一步提高。在此，通过将木质素纳米颗粒（LNPs）与海藻酸钠（SA）结合，成功合成了一种二元生物质基固体电解质膜（LSE）。深入研究了SA与LNPs的质量比对LSE的微观结构、孔隙率、电解质吸收能力、离子电导率和电化学性能的影响。结果表明，随着SA在LNPs中的比例从5%增加到15%，LSE的孔结构变得越来越均匀且丰富。因此，孔隙率、液体吸收能力、离子电导率和整体电化学性能均有所增强。值得注意的是，当SA含量为LNPs的15%时，所得LSE-15的离子电导率为14.10 mS cm，孔隙率和液体吸收能力分别达到58.4%和308%。LSE-15用作固体电解质，而基于LNP的碳气凝胶（LCA）用作构建对称全固态超级电容器（SSC）的两个电极。该SSC器件展现出卓越的电化学存储容量，在0.5 A g下比电容达到197 F g，最大能量密度和功率密度分别为27.33 W h kg和4998 W kg。此外，该SSC器件在压缩、弯曲以及串联和并联连接等极端条件下均表现出高度稳定的电化学性能。因此，二元生物质基固体电解质膜在超级电容器中的开发与应用是储能领域利用高价值生物质资源的一种有前景的策略。
