阻燃聚合物电解质高稳定锂负极界面研究进展

Research progress on highly stable lithium anode interface of flame-retardantpolymer electrolyte

为高效发挥阻燃聚合物电解质所具备的轻质、柔性、固-固界面相容性好等优势,推动电化学能源存储体系向安全可靠的全固态转型,基于锂离子(Li~+)配位团簇结构复杂等特点,分析分子间通过竞争作用调控阻燃聚合物电解质衍生的固体电解质界面膜(SEI)所面临的挑战,综述国内外阻燃聚合物电解质高稳定性界面构筑、锂离子配位结构设计、离子输运机制、界面热稳定性等方面的研究进展,预测聚合物电解质内部分子间作用主导调控的Li~+配位结构在提高锂金属-电解质稳定性领域的应用前景,展望未来全固态锂金属电池中阻燃聚合物电解质的研究发展方向。研究结果表明:调控Li~+配位团簇结构是提高锂金属负极/阻燃聚合物电解质界面稳定性的关键。研究结果可为全固态锂金属电池实际应用提供界面设计参考。

In order to utilize the advantages such as lightweight,flexibility,and good solid-solid interface compatibility of flame-retardant polymer electrolyte effectively,and promote the transformation of electrochemical energy storage system to safe and reliable all-solid-state,based on the characteristics of the complex Li+coordination cluster structure,the challenge in regulating the solid electrolyte interface(SEI)derived from flame-retardant polymer electrolyte by the competitive interactions between molecules was analyzed.The research progress in the aspects of the construction of high-stability interface,the design of Li+coordination structure,the ion transport mechanism,and the thermal stability of interphase of flame-retardant polymer electrolyte was summarized.The application prospect of Li+coordination structure predominantly regulated by intermolecular interaction in polymer electrolyte in improving the stability of lithium metal-electrolyte was predicted,and the future expectations on the research development directions of flame-retardant polymer electrolyte in all-solid-state lithium metal batteries was proposed.The research results show that the regulation of Li+coordination cluster structure is crucial for improving the stability of lithium metal anode/flame-retardant polymer electrolyte interface.The research results can provide reference for the interface design in the practical application of all-solid-state lithium metal batteries.