In this study, we used a solution-casting technique to prepare all-solid-state composite polymer electrolytes (CPEs) based on poly(vinyl alcohol)/polyacrylonitrile blends, the ceramic filler Li_1.4Al_0.4Ti_1.6(PO₄)₃ (LATP, NASICON-type structure), lithium bis(trifluoromethanesulfonyl)imide, and the solid plasticizer succinonitrile (SN) and then investigated their electrochemical stability, ionic transport properties, and interfacial behavior against lithium electrodes. The CPEs prepared with optimal concentrations of LATP (20 wt %) and SN (10 wt %) exhibited a maximum ionic conductivity of 1.13 × 10^–4 S cm^–1 at 25 °C, a Li⁺-ion transference number of 0.507, and an electrochemical stability window of 5.1 V (vs Li/Li⁺). This CPE was a free-standing membrane and highly flexible. An all-solid-state Li//LiFePO₄ battery assembled with this CPE displayed excellent cycling stability and rate performance at room temperature. A maximum discharge capacity of 159.6 mA h g^–1 was achieved at 0.1C. The full cell achieved a discharge capacity of 119.4 mA h g^–1 at 0.5C and a capacity retention of 90.5% after 100 cycles at ambient temperature. Therefore, this as-prepared CPE shows great promise for use in all-solid-state lithium-metal batteries.

中文翻译：

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基于PVA / PAN的全固态锂金属电池在室温下操作的复合聚合物电解质

在这项研究中，我们使用溶液浇铸技术制备了基于聚乙烯醇/聚丙烯腈共混物，陶瓷填料Li _1的全固态复合聚合物电解质（CPE）_。4 Al _{0 。4} Ti _{1 。6}（PO ₄）₃（LATP，NASICON型结构），双（三氟甲磺酰基）酰亚胺锂和固态增塑剂丁二腈（SN），然后研究它们的电化学稳定性，离子传输性能和对锂电极的界面行为。最佳浓度的LATP（20 wt％）和SN（10 wt％）制备的CPE的最大离子电导率为1.13×10在25°C时为^–4 S cm ^–1，Li ⁺离子转移值为0.507，电化学稳定性窗口为5.1 V（vs Li / Li ⁺）。该CPE是独立式膜，具有很高的柔韧性。与此CPE组装的全固态Li // LiFePO ₄电池在室温下显示出出色的循环稳定性和倍率性能。在0.1C下，最大放电容量为159.6 mA hg ^–1。充满电的电池在0.5C的温度下达到119.4 mA hg ^–1的放电容量，在环境温度下100个循环后的容量保持率为90.5％。因此，这种制备的CPE有望用于全固态锂金属电池。