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In Operando Small-Angle X-ray Scattering Investigation of Nanostructured Polymer Electrolyte for Lithium-Ion Batteries
ACS Energy Letters ( IF 22.0 ) Pub Date : 2018-06-06 00:00:00 , DOI: 10.1021/acsenergylett.8b00763
Gilles E. Möhl 1, 2 , Ezzeldin Metwalli 1 , Peter Müller-Buschbaum 1
Affiliation  

Electrochemical energy storage still presents one of the biggest challenges that society has to face by developing alternative lithium-ion batteries (LIBs) as they already satisfy important preconditions by providing the highest energy and power densities of all battery systems. Nowadays, the employed liquid electrolytes in LIBs do not merge the world’s increasing demand of safely working batteries. Here, we use a lithium salt-doped diblock copolymer electrolyte:poly(styrene)-block-poly(ethylene oxide)/bis(trifluoromethane) lithium salt, denoted PS-b-PEO/LiTFSI, as a solid-state electrolyte. The evolving nanoscale morphology of the electrolyte material in a capillary-based LIB cell is investigated using in operando small-angle X-ray scattering (SAXS). The electrolyte is sandwiched between two opposing electrodes inside of a glass capillary and investigated during cycling at 90 °C while the X-ray beam is oriented orthogonally to the ionic current. Lithium iron phosphate (LFP) is used as a cathode, while both lithium-metal and graphite anode materials are used for the investigation of the solid-state electrolytes. The ill-defined structured lithium-ion containing block copolymer electrolyte seems morphologically more favorable for cell performance, and this is independent of the choice of anode material due to better electrode/electrolyte compatibility.

中文翻译:

锂离子电池纳米结构聚合物电解质的Operando小角X射线散射研究

电化学储能仍然是开发替代锂离子电池(LIB)所面临的最大挑战之一,因为它们已经通过提供所有电池系统中最高的能量和功率密度来满足重要的前提条件。如今,在LIB中使用的液态电解质已不能与世界上对安全工作电池不断增长的需求相融合。这里,我们使用的锂盐掺杂二嵌段共聚物电解质:聚(苯乙烯) -嵌段-聚(环氧乙烷)/双(三氟甲烷)锂盐,表示为PS- b-PEO / LiTFSI,作为固态电解质。在手术中使用小角度X射线散射(SAXS)研究了基于毛细管的LIB电池中电解质材料的纳米级形貌演化。电解质夹在玻璃毛细管内部的两个相对电极之间,并在90°C的循环过程中进行研究,而X射线束与离子电流正交。磷酸铁锂(LFP)用作阴极,而锂金属和石墨阳极材料均用于固态电解质的研究。形态不明确的含锂离子的嵌段共聚物电解质在形态上似乎对电池性能更有利,并且由于更好的电极/电解质相容性,这与阳极材料的选择无关。
更新日期:2018-06-06
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