Co-Innovation Center of Efficient Processing and Utilization of Forest Resource, School of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China.
Co-Innovation Center of Efficient Processing and Utilization of Forest Resource, School of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China.
Int J Biol Macromol. 2024 Oct;277(Pt 2):134341. doi: 10.1016/j.ijbiomac.2024.134341. Epub 2024 Jul 30.
The Mg-ion battery faces significant limitations due to its liquid electrolyte, which suffers from inherent issues such as leakage and the growth of Mg dendrites. In contrast, gel polymer electrolytes (GPEs) offer heightened safety, a wide voltage window, and excellent flexibility, making them a promising alternative with outstanding electrochemical performance. In this study, a cyano-modified cellulose (CEC) GPE was engineered to aim at enhancing ion transportation and promoting uniform ion-flux through interactions between N and Mg ions. The resulting CEC-based GPE demonstrated a high ionic conductivity of 1.73 mS cm at room temperature. Furthermore, it exhibited remarkable Mg plating/stripping performance (coulombic efficiency ∼96.7 %) and compatibility with electrodes. Importantly, when employed in a Mo6S8//Mg battery configuration, the CEC GPE displayed exceptional cycle stability, with virtually no degradation observed even after 650 cycles at 1C, thereby significantly advancing Mg-ion battery technology due to its excellent electrochemical properties. This study provides valuable insights into the molecular engineering of cellulose-based GPEs.
镁离子电池因其液态电解质而面临重大限制，该电解质存在固有问题，如泄漏和镁枝晶的生长。相比之下，凝胶聚合物电解质（GPE）具有更高的安全性、更宽的电压窗口和出色的灵活性，是一种具有优异电化学性能的很有前途的替代品。在这项研究中，设计了一种氰基改性纤维素（CEC）GPE，旨在通过 N 和 Mg 离子之间的相互作用来提高离子传输并促进均匀的离子通量。基于 CEC 的所得 GPE 在室温下表现出 1.73 mS cm 的高离子电导率。此外，它表现出出色的镁电镀/剥离性能（库仑效率≈96.7%）和与电极的兼容性。重要的是，当在 Mo6S8//Mg 电池配置中使用时，CEC GPE 表现出优异的循环稳定性，即使在 1C 下经过 650 次循环后也几乎没有降解，由于其出色的电化学性能，因此极大地推动了镁离子电池技术的发展。这项研究为纤维素基 GPE 的分子工程提供了有价值的见解。
