Solid‐state poly(ethylene oxide) (PEO) electrolyte exhibits a low ionic conductivity at ambient conditions, and large interfacial resistance between PEO and electrodes obstructs its applications in lithium metal batteries. Heterogeneous solid electrolytes (HSEs) are an alluring solution for the exploitation of PEO. Herein, PEO/poly(vinylidene fluoride‐co‐hexafluoropropylene) (PVDF‐HFP)/micron‐sized Li_1.4Al_0.4Ti_1.6(PO₄)₃ (LATP) heterogeneous solid electrolytes are originally prepared to decrease the crystallinity of PEO and interfacial resistance between HSEs and electrodes. Heterogeneous solid electrolyte composed of PEO/PVDF‐HFP/5% micron‐sized LATP (PPL‐5) exhibits superior electrochemical properties in ionic conductivity (3.01 × 10⁻⁵ S cm⁻¹), lithium transference number (0.55) at 30 °C, and a broad potential window (5.31 V). Li/PPL‐5/Li symmetric cell displays a relatively stable potential response during 800 h cycling, authenticating long‐term compatibility between the as‐prepared electrolyte and lithium metal. LiFePO₄ (LFP) is used as a cathode to test the chemical and electrochemical stability of PPL‐5. The discharge capacity of LFP/PPL‐5/Li coin cell maintains 97.9 mAh g⁻¹ at 0.8 C after 500 cycles with capacity retention of 86.7%. Such excellent performance of PPL‐5 can be ascribed to the reduction of crystallinity of PEO and the improvement of the interfacial contact between electrolyte and electrodes, when PVDF‐HFP and micron‐sized LATP are simultaneously incorporated with PEO electrolyte.

中文翻译：

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通过在PEO / PVDF-HFP非均质聚合物基体中混合微米级LATP来提高固态锂电池的性能

固态聚环氧乙烷（PEO）电解质在环境条件下表现出较低的离子电导率，并且PEO和电极之间的大界面电阻阻碍了其在锂金属电池中的应用。异质固体电解质（HSE）是利用PEO的诱人解决方案。在此，PEO /聚偏二氟乙烯-共-六氟丙烯（PVDF-HFP）/微米尺寸的Li _1.4 Al _0.4 Ti _1.6（PO ₄）₃（LATP）异质固体电解质最初是为了降低PEO的结晶度和HSE与电极之间的界面电阻而制备的。由PEO / PVDF-HFP / 5％微米大小的LATP（PPL-5）组成的非均质固体电解质在离子电导率（3.01×10 ^-5  S cm ^-1），30°C下的锂转移数（0.55）方面表现出优异的电化学性能C和宽的电位窗口（5.31 V）。Li / PPL-5 / Li对称电池在800 h循环中显示出相对稳定的电位响应，证明了所制备的电解质与锂金属之间的长期兼容性。磷酸铁锂₄（LFP）用作阴极以测试PPL-5的化学和电化学稳定性。在经过500次循环后，LFP / PPL-5 / Li纽扣电池的放电容量在0.8 C下保持97.9 mAh g ^-1，容量保持率为86.7％。当PVDF-HFP和微米级LATP与PEO电解质同时加入时，PPL-5如此出色的性能可归因于PEO结晶度的降低和电解质与电极之间界面接触的改善。