Cao Xuefei, Xin Mingyang, Yin Jiaxin
Criminal Investigation and Counter-Terrorism College, Criminal Investigation Police University of China, Shenyang 110854, China.
School of Chemistry, Northeast Normal University, Changchun 130024, China.
Molecules. 2024 Nov 21;29(23):5487. doi: 10.3390/molecules29235487.
The traditional liquid electrolytes pose safety hazards primarily attributed to the flammability of organic solvent, whereas solid-state electrolytes can significantly enhance the safety of lithium-ion batteries. Polymer solid electrolytes are being considered as an effective solution due to their excellent flexibility and low cost, but they suffer low ionic conductivity or high interface impedance. Here, the ketone-containing allyl acetoacetate monomers were polymerized within the cellulose membrane via UV photopolymerization to prepare a cellulose-supported poly-allyl acetoacetate polymer electrolyte. The PAAA electrolyte shows the ion conductivity of 1.14 × 10 S cm and the electrochemical stability window of 4.5 V. The Li symmetric battery can stably cycle for 1500 h at 0.1 mA cm. The LiFeO‖Li cell achieves a discharge specific capacity of 160 mAh g and demonstrates excellent cycling stability. Matching with Ni-rich cathodes also delivers decent performance. The designed polymer electrolyte with high ionic conductivity offers new ideas and directions for the development of future energy storage technology.
传统的液体电解质主要由于有机溶剂的易燃性而存在安全隐患，而固态电解质可以显著提高锂离子电池的安全性。聚合物固体电解质因其优异的柔韧性和低成本而被视为一种有效的解决方案，但它们存在离子电导率低或界面阻抗高的问题。在此，通过紫外光聚合将含酮的烯丙基乙酰乙酸酯单体在纤维素膜内聚合，以制备纤维素负载的聚烯丙基乙酰乙酸酯聚合物电解质。PAAA电解质的离子电导率为1.14×10 S cm，电化学稳定窗口为4.5 V。锂对称电池在0.1 mA cm下可稳定循环1500 h。LiFeO‖Li电池的放电比容量达到160 mAh g，并表现出优异的循环稳定性。与富镍阴极匹配也具有良好的性能。所设计的具有高离子电导率的聚合物电解质为未来储能技术的发展提供了新的思路和方向。
