A novel approach for the atomic scale characterization of Li-ion battery components probed by positron annihilation lifetime spectroscopy

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Research Bulletin Pub Date : 2024-08-23 DOI:10.1016/j.materresbull.2024.113064

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Abstract

Recent research has focused on solid polymer electrolytes (SPEs) as the best liquid electrolyte replacements. Poly(ethylene oxide) (PEO) is the most frequent one because of its fast segmental movements in the free volume which controls lithium-ion transport between electrodes. Therefore, PEO-based copolymer electrolytes that can be tailored for mechanical strength and ionic conductivity are often studied. The most popular material is PEO chains containing PMMA because PEO transports ions, and PMMA has good mechanical properties. Further investigations on PEO-based solid polymer electrolytes (SPEs) have shown that chain designs with more nonlinear branches prevent crystallinity and maintain fast segmental dynamics. For this purpose, we worked on PEO-grafted-PMMA copolymers in which the free volume probed by positron annihilation lifetime spectroscopy considerably affects the structure-ionic conductivity relationship. Finally, we investigated the free volume theory of ionic condcutivity using Yahsi-Ulutas-Tav (YUT) theory.

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利用正电子湮没寿命光谱探测锂离子电池组件原子尺度特性的新方法

最近的研究重点是将固体聚合物电解质（SPE）作为最佳的液体电解质替代品。聚环氧乙烷（PEO）是最常用的电解质，因为它在自由体积中的快速分段移动控制着电极之间的锂离子传输。因此，人们经常研究可定制机械强度和离子导电性的 PEO 基共聚物电解质。最受欢迎的材料是含有 PMMA 的 PEO 链，因为 PEO 可以传输离子，而 PMMA 具有良好的机械性能。对基于 PEO 的固体聚合物电解质（SPE）的进一步研究表明，具有更多非线性分支的链设计可以防止结晶，并保持快速的分段动态。为此，我们研究了 PEO 接枝-PMMA 共聚物，其中正电子湮灭寿命光谱法探测到的自由体积在很大程度上影响了结构-离子电导率关系。最后，我们利用 Yahsi-Ulutas-Tav（YUT）理论研究了离子电导率的自由体积理论。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.