Study on preparation and performance of poly（m-phenylene isophthalamide）/solid-state ionic conductor composite membrane

doi:10.19799/j.cnki.2095-4239.2022.0067

Abstract

Abstract:

The nonsolvent induced phase separation (NIPS) method was used to create Poly(m-phenylene isophthalamide)/solid-state ionic conductor composite membranes (PMIA-LATP-PEO) with high thermal stability and excellent electrolyte wettability. Poly(m-phenylene isophthalamide)(PMIA) serves as an insulation and high-temperature stability matrix in the composite system. Li_1.3Al_0.3Ti_1.7(PO₄)₃(LATP) with a sodium super ion conductor (NASICON) structure is a solid-state ionic conductor evenly distributed in the membrane for the enhancement of the ionic conductivity of the composite membrane. Poly (ethylene oxide) (PEO) plays a role in adjusting the pore size in the process of membrane preparation and can improve the interface stability between membranes with lithium metal. The morphology and element distribution of membranes were studied using scanning electron microscopy (SEM) and energy spectrum analysis (EDS). Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and thermal shrinkage methods were used to characterize the thermal stability of the membranes. The electrochemical properties of the membranes, such as ionic conductivity and lithium-ion transference number, were measured using electrochemical technology. The cycling performance and rate performance of the composite membranes were measured in the LiFePO₄||Li cells. PMIA-LATP-PEO membrane has a dense pore structure and reliable insulation and maintains a stable dimensional shape at 200 ℃. The lithium ionic conductivity is 2.07×10^-3 S/cm^{(25 ℃) for electrochemical performance, and the transference number of lithium-ion is 0.75. Furthermore, the PMIA-PEO-LATP membrane is resistant to lithium metal. In Li||Li symmetrical cells, the PMIA-PEO-LATP membrane can run stably for over 1000 h at 0.5 mA/cm². Furthermore, the PMIA-PEO-LATP membrane can inhibit the growth of lithium dendrites, allowing LiFePO₄||Li cells to show superior cycling stability.}

Key words: PMIA, composite membrane, LATP, lithium dendrites inhibition, high temperature resistant separator

CLC Number:

TM 912

Yonggang LOU, Dayong WU, Boran CAI, Weihua LIANG, Luye YANG, Lei HE, Jianhua CAO. Study on preparation and performance of poly（m-phenylene isophthalamide）/solid-state ionic conductor composite membrane[J]. Energy Storage Science and Technology, 2022, 11(10): 3112-3122.

Figures/Tables 8

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样品名	孔隙率/%	吸液率/%	厚度/µm	抗击穿电压/V
PMIA	65±0.8	约192	70	>500
PMIA-LATP	61±1.2	约224	70	>500
PMIA-PEO	79±0.9	约323	75	>500
PMIA-LATP-PEO	77±1.3	约346	75	>500