Materials Today Energy ( IF 9.3 ) Pub Date : 2020-02-13 , DOI: 10.1016/j.mtener.2020.100389 K. Karthik , Mir Mehraj Ud Din , Anbu Dinesh Jayabalan , Ramaswamy Murugan
A new class of electrolytes with enhanced flexibility, high lithium ion (Li+) conductivity, excellent electrochemical stability, good cyclic ability and improved safety are crucial for high performance of lithium-metal batteries. Composite polymer electrolytes assist in overwhelming safety-related issues faced by Li+ batteries with organic liquid electrolytes. Herein, we report on polymer nanocomposite electrospun fibrous membranes (PNEFM) comprising of Li6.28Al0.24La3Zr2O12 (LLZA) garnet oxide nano-fillers in poly (vinylidene fluoride-co-hexafluoropropylene) P(VDF-HFP) co-polymer prepared by electrospinning technique. Li+ conductivity of the PNEFM is remarkably improved by the addition of LLZA garnet filler. The PNEFM-8 (with 8 wt% of LLZA) exhibits a maximized Li+ conductivity of 2.25 × 10−3 S cm−1 at room temperature (25 °C). The PNEFM-8 exhibits a wide electrochemical potential window up to 5.5 V. A full cell with Li||PNEFM-8||LiFePO4 configuration at 25 °C displayed first discharge capacity of 160 mA h g−1 and a reversible discharge capacity of 145 mA h g−1 for 100th cycle at 0.1 C with Coulombic efficiency of 98.78%. Furthermore, PNEFM-8, integrated with composite sulphur cathode exhibits an excellent first discharge capacity of 1311 mA h g−1 and a reversible discharge capacity of 1105 mA h g−1 after 10th cycles with 98.30% Coulombic efficiency. The present study could contribute towards the development of higher performance and safe room temperature Li-metal batteries.
中文翻译:
锂石榴石内置3D电纺纤维膜,用于大容量锂金属电池
具有增强的柔韧性,高锂离子(Li +)电导率,优异的电化学稳定性,良好的循环能力和更高的安全性的新型电解质对于锂金属电池的高性能至关重要。复合聚合物电解质协助面对铺天盖地李安全相关的问题+有机液体电解质电池。在这里,我们报告的聚合物纳米复合电纺纤维膜(PNEFM)组成的Li 6.28 Al 0.24 La 3 Zr 2 O 12(LLZA)石榴石氧化物纳米填料在聚偏二氟乙烯-共六氟丙烯P(VDF-HFP)中-通过静电纺丝技术制备的聚合物。李+通过添加LLZA石榴石填料,可显着提高PNEFM的电导率。PNEFM-8(具有8 wt%的LLZA) 在室温(25°C)下表现出最大的Li +电导率,为2.25×10 -3 S cm -1。PNEFM-8在高达5.5 V的电压下显示出较宽的电化学电势窗口。在25°C时具有Li || PNEFM-8 || LiFePO 4构型的全电池显示出160 mA h g -1的首次放电容量和可逆的放电容量。 145毫安汞柱-1为100次循环以0.1C具有98.78%库仑效率。此外,与复合硫磺阴极集成的PNEFM-8具有1311 mA h g -1的出色的首次放电容量第10次循环后可逆放电容量为1105 mA h g -1,库仑效率为98.30%。本研究可能有助于开发更高性能和更安全的室温锂金属电池。