聚氧乙烯基聚合物固态电池的界面研究进展

Recent research progress of interface for polyethylene oxide based solid state battery

聚氧乙烯基聚合物固态电池具有高安全性和高能量密度的特点,极有可能成为下一代储能器件.然而,聚氧乙烯基电解质本身的电化学窗口窄,极大的限制了其能量密度的进一步提升.目前适配聚氧乙烯基电解质且长循环稳定的正负极材料较少,这严重阻碍了聚氧乙烯基聚合物固态电池的广泛应用.其主要问题在于电极材料与聚氧乙烯聚合物电解质之间的负极界面和正极界面都容易发生副反应,大大地缩短了电池的循环寿命.为了抑制这些副反应,人们采取了相应的策略,取得了一定的成效.为充分理解固态电池界面处的变化,可采用各类先进表征手段对其进行研究,这将为下一步提高固态电池循环稳定性提供更科学的依据.

Polyethylene oxide(PEO)based solid-state batteries have high safety and high energy density,making them suitable for next-generation energy storage devices.However,their energy density reaches a limitation due to the narrow electrochemical window of PEO solid electrolyte.The electrode materials that are compatible with PEO electrolyte is less,thus handering it from being put into wide application.At the PEO/electrode interface,there are side reactions between anode/PEO and PEO cathode.Some strategies are proposed to reduce the side reactions,electrochemical performances of solid-state batteries are improved.To understand the change of interface,several advanced characterizations are employed,which can offer scientific evidence of increasing the interface stability in the future.