全固态钠离子电池用聚氧化乙烯基固态聚合物电解质研究进展

钠离子电池用聚氧化乙烯(PEO)基固态电解质较有机液态电解液具有更高的安全性、柔韧性和稳定性,是最有发展前景的下一代电池技术。然而,PEO存在室温下易结晶,离子电导率低,成膜力学性能差等问题,限制了其在钠离子电池中的广泛应用。文中从钠盐选择和PEO基体改性两方面综述了钠离子电池用PEO基固态聚合物电解质在改善其离子电导率、电化学窗口和离子迁移数等性能方面的研究,并展望了其发展前景。

Polyethylene oxide (PEO) based solid polymer electrolytes (SPEs) for sodium ion batteries possessing higher safety, flexibility, and stability than conventional organic liquid electrolytes hold great promise for the next generation of ionic battery technology. However, crystalline PEO has low ionic conductivity and mechanical strength, which limits its wide applications. In this paper, the research progress of PEO-based SPEs on the improvement in ionic conductivity, electrochemical stability window and ionic transference number was summarized from the use of sodium salts and PEO modification points of view. The broad future was forecasted as well.
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