Thin film electrolytes for novel lithium-ion battery designs

用于新型锂离子电池设计的薄膜电解质

• 批准号: 2282286
• 金额: --
• 依托单位: University of Oxford
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2282286
• 关键词: Thin; film; electrolytes; novel; lithium

Oxford University is one of the founder members of the Faraday Institution (https://faraday.ac.uk), the UK's new flagship programme for battery science and technology. Rechargeable lithium-ion batteries have revolutionized the portable electronics industry because of their high energy density and efficiency, and are now widely deployed in electric vehicles. However, they suffer from significant safety and reliability issues, many of which are related to the use of flammable liquid electrolytes. There is a world-wide race to design and manufacture solid-state electrolyte materials that could resolve some of these problems. A range of oxide, phosphate and sulphide compounds have rather lower conductivities than liquid electrolytes, but show promise for use in prototype all solid-state battery designs if the thickness of the electrolyte can be reduced. The interfaces between electrodes and electrolytes are also well known to be electrochemically unstable, and strategies to modify the interfacial properties are being widely explored.This project will use pulsed laser deposition techniques to deposit thin films that modify the chemistry of the interfaces between electrode and electrolyte materials in order to improve the cycling performance of prototype solid state battery designs. While thin film interlayers are attracting a lot of attention In laboratories worldwide, most of the reported work is very empirical - "we add a layer of XXX and the cycling performance improves". The novelty of the research methodology that will be applied in this project lies in the focussed material science approach to identify and control exactly what is being deposited and then to characterise the interfacial regions after cycling to understand the chemical and morphological changes that occur. The first stage of the project will study the influence of the deposition parameters on the phase, microstructure and mechanical properties of the films using XRD and electron microscopy techniques to establish the optimised growth conditions, and the electrochemical performance of promising structures will be measured. Facilities for the growth of complete thin film cells are available (funded by the Faraday Institution and Royce Institute). In the second stage of the project, a combination of more advanced electron microscopy techniques and in-operando synchrotron based tools (XPS/XAS/XRD) have been selected in order to determine the response of the interfacial region to current transfer. In this way we will build up a mechanistic understanding of how interfacial layers can influence the electrochemical performance of thin film battery structures, and be able to propose methods for optimising properties. This project falls within the EPSRC research area of Energy Storage.

牛津大学是法拉第研究所（https：//www.example.com）的创始成员之一，该研究所是英国电池科学和技术的新旗舰项目。faraday.ac.uk可充电锂离子电池由于其高能量密度和效率而彻底改变了便携式电子行业，并且现在被广泛部署在电动汽车中。然而，它们存在显著的安全性和可靠性问题，其中许多问题与易燃液体电解质的使用有关。世界范围内存在着设计和制造能够解决这些问题的固态电解质材料的竞赛。一系列氧化物、磷酸盐和硫化物化合物的电导率比液体电解质低得多，但如果电解质的厚度可以减少，则有望用于所有固态电池的原型设计。众所周知，电极和电解质之间的界面是电化学不稳定的，并且正在广泛探索修改界面性质的策略。本项目将使用脉冲激光沉积技术来沉积存款薄膜，以修改电极和电解质材料之间的界面的化学性质，从而改善原型固态电池设计的循环性能。虽然薄膜夹层在世界各地的实验室中吸引了很多关注，但大多数报道的工作都是非常经验性的-“我们添加了一层XXX，循环性能得到了改善”。该项目将应用的研究方法的新奇在于集中的材料科学方法，以识别和控制沉积的确切内容，然后在循环后对界面区域进行分析，以了解发生的化学和形态变化。该项目的第一阶段将使用XRD和电子显微镜技术研究沉积参数对薄膜的相，微观结构和机械性能的影响，以建立优化的生长条件，并测量有前途的结构的电化学性能。用于生长完整薄膜电池的设施是可用的（由法拉第研究所和罗伊斯研究所资助）。在该项目的第二阶段，更先进的电子显微镜技术和在operando同步加速器为基础的工具（XPS/XAS/XRD）的组合已被选定，以确定界面区域的电流转移的响应。通过这种方式，我们将建立对界面层如何影响薄膜电池结构电化学性能的机械理解，并能够提出优化性能的方法。该项目属于EPSRC储能研究领域的福尔斯。