Fabrication of Vertically Aligned Nanocomposite thin-films to probe lithium diffusion through the electrode/electrolyte interface

制造垂直排列的纳米复合材料薄膜以探测锂通过电极/电解质界面的扩散

• 批准号: 2108857
• 金额: --
• 依托单位: University of Cambridge
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2108857
• 关键词: Fabrication; Vertically; Aligned; Nanocomposite; thin

Since the pioneering work of John Goodenough and co-workers in 1980, Li-ion batteries have become the number one choice to power electronic devices such as mobile phones and laptops. However, they pose significant safety issues due to containing flammable Li electrolytes, and Li dendrite growth between electrodes causing short circuiting and eventual battery death. Solid state electrolytes, an alternative to the conventual liquid electrolytes, can overcome these issues as they are non-flammable and supress dendrite growth. Also, with the right structuring, they have potential for higher energy storage capabilities. However, solid state materials generally suffer from lower conductivities, which limits battery performance. This can be attributed to 1) high interfacial impedances between electrode/electrolyte materials and 2) low conductivities limited by structure. Materials discovery focusing on the latter point currently dominates research in the field. A better understanding of the interface between solid state battery materials could contribute significantly to enhancing the performance of solid state batteries. However, there are limited experimental techniques to directly probe the interface (which are often difficult to perform) owing to it being buried and very small (few nm thick). Vertically Aligned Nanocomposite (VAN) thin-films could address this issue, as they have a significantly larger interface surface area. This might enhance signals in experiments such as solid state NMR, and allow direct probing of the interface. Also, due to the self-assembling nature of VANs, these films offer an easy method to form high interface surface areas. The initial aims of this project will be to synthesise and probe carefully chosen VAN films containing Li materials relevant to solid state batteries. At the time of writing, there are no reported Li VAN films in literature, so these studies will form some of the preliminary work in this area. Solid state NMR studies on these materials (in collaboration with the Grey Group, Cambridge) will be performed to probe the interface and, if signal enhancement is present and allows, Li ion migration across it. Beyond this, these studies will explore potential applications within the solid state thin film battery field by synthesis of 3D interdigitated cathode/electrolyte/anode materials.

自1980年John Goodenough及其同事的开创性工作以来，锂离子电池已成为为移动的手机和笔记本电脑等电子设备供电的首选。然而，由于含有易燃的Li电解质，以及电极之间的Li枝晶生长导致短路和最终的电池死亡，它们造成了显著的安全问题。固态电解质是传统液体电解质的替代品，可以克服这些问题，因为它们是不可燃的，并抑制枝晶生长。此外，通过正确的结构，它们具有更高的储能能力的潜力。然而，固态材料通常具有较低的电导率，这限制了电池性能。这可归因于1）电极/电解质材料之间的高界面阻抗和2）受结构限制的低电导率。材料发现集中在后一点目前主导着该领域的研究。更好地理解固态电池材料之间的界面可以显著地有助于提高固态电池的性能。然而，有有限的实验技术来直接探测的界面（这往往是难以执行），由于它被掩埋和非常小（几纳米厚）。垂直排列纳米复合材料（货车）薄膜可以解决这个问题，因为它们具有显着更大的界面表面积。这可能会增强固态NMR等实验中的信号，并允许直接探测界面。此外，由于VAN的自组装性质，这些膜提供了形成高界面表面积的简单方法。该项目的最初目标是合成和探测精心选择的含有与固态电池相关的Li材料的货车膜。在撰写本文时，文献中还没有关于李货车电影的报道，因此这些研究将形成这方面的一些初步工作。对这些材料的固态NMR研究（与剑桥的Grey Group合作）将用于探测界面，如果存在信号增强并允许Li离子迁移通过它，这些研究将探索通过合成3D交叉阴极/电解质/阳极材料在固态薄膜电池领域的潜在应用。

项目成果

Route to High-Performance Micro-solid Oxide Fuel Cells on Metallic Substrates.

• DOI: 10.1021/acsami.0c15368
• 发表时间: 2021-01-27
• 期刊: ACS applied materials & interfaces
• 影响因子: 9.5
• 作者: Wells MP;Lovett AJ;Chalklen T;Baiutti F;Tarancón A;Wang X;Ding J;Wang H;Kar-Narayan S;Acosta M;MacManus-Driscoll JL
• 通讯作者: MacManus-Driscoll JL

Vertically Aligned Nanocomposite Thin Films for Micro-Battery and Nanoionic Applications

用于微电池和纳米离子应用的垂直排列纳米复合薄膜

• DOI: 10.17863/cam.105466
• 发表时间: 2022
• 作者: Lovett A