【摘要】 聚偏氟乙烯-六氟丙烯共聚物（polyvinylidene fluoride-co-hexafluoropropylene, PVDF-HFP）基聚合物电解质存在室温离子电导率较低且与锂金属界面稳定性较差等问题，这限制了其应用范围。为此，将具有弹性和粘性的聚环氧乙烷（poly（ethylene oxide）,PEO）掺入PVDF-HFP基电解质中，以改善其离子传导和与电极间的界面相容性。PVDF-HFP与PEO以质量比为3∶1混合的电解质在室温下的离子电导率(5.618×10^-4 S·cm^-1)和锂离子迁移数（0.403）最高。基于该电解质组装的锂-锂对称电池可在0.10 mA·cm^-2和25℃的条件下稳定电镀-剥离长达650 h。基于该电解质组装的以LiCoO₂为正极、锂为负极的全电池在0.2 C倍率下循环50次后仍具有115.9 mA·h·g^-1的比容量。更多还原

【Abstract】 Polyvinylidene fluoride-co-hexafluoropropylene（PVDF-HFP）-based polymer electrolytes suffer from issues such as low ionic conductivity and poor interfacial stability with lithium（Li） metal at room temperature, which limit their range of applications.To address this, poly（ethylene oxide）（PEO）,which possesses elasticity and viscosity, is incorporated into the PVDF-HFP-based electrolyte to enhance its ionic conductivity and interfacial compatibility with electrodes.The electrolyte, mixed with PVDF-HFP and PEO in a 3∶1 mass ratio, exhibits the highest ionic conductivity(5.618×10^-4 S·cm^-1) and lithium ion（Li⁺） transport number（0.403） at room temperature.The Li-Li symmetric cells assembled with this electrolyte can stably undergo electroplating-stripping for up to 650 h under a current density of 0.10 mA·cm^-2 at 25 ℃.Full batteries, assembled with a LiCoO₂ cathode and lithium anode, maintain a specific capacity of 115.9 mA·h·g^-1 after 50 cycles at 0.2 C-rate.更多还原