Thin film solid electrolyte batteries

薄膜固体电解质电池

• 批准号: 2114670
• 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: 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-2114670
• 关键词: Thin; film; solid; electrolyte; batteries

This project is part of a new activity on the deposition and characterisation of solid state electrolytes (SSE) in Li-ion batteries, and will benefit from close interaction with the SOLBAT project of the Faraday Institution (https://www.solbat-faraday.org/). The project will explore reliable methods for the growth of thin films of promising electrolyte materials by sputtering and pulsed laser deposition (PLD). The choice of materials to study will be informed by other projects in the SOLBAT collaboration, and will include oxides with the garnet structure and possibly sulphides, and other novel materials as they are discovered. A wide range of parameters (substrate temperature, gas phase pressure, laser/sputter power and composition) can be varied to optimise the ionic conductivity and the critical, and hard to control, problem of ensuring film uniformity. These properties will be measured initially by routine electrochemical impedance spectroscopy (EIS) measurements, phase purity by XRD, and microstructural analysis and uniformity by SEM. The properties of amorphous thin film materials will also be explored since there is very recent evidence that these can have surprisingly good ionic conductivities. PLD processes are ideal for this work, with a very high degree of control over the degree of crystallinity being readily provided by changing deposition parameters. These amorphous electrolytes may also offer interesting opportunities to manage the serious problem of Li dendrite growth in all kinds of SSE battery designs. Once reproducible growth processes have been established, a second stage of the project will be to study the electrolyte/electrode interactions that control the performance of complete batteries. The methodology employed will be the sequential deposition of electrode and electrolyte materials, and electron microscopy and secondary ion mass spectroscopy (SIMS) techniques to study chemical and morphological interactions after heat treatments, and later on, after current cycling of symmetric structures. In-situ and in-operando experiments on multi-layered samples and complete battery structures using the Diamond light Source will also be explored. The overall aim of the project is to offer to the SOLBAT project a route to prototype battery manufacture based on a thin film strategy. There is no current work in the UK, and very little published internationally, on thin film electrolytes, and none at all on interfacial reactions and degradation mechanisms in these materials, and so the proposed research methodology has a high degree of novelty. The student will work closely with other members of the SOLBAT team, in Oxford and in partner universities, and so gain valuable experience with complementary electrochemistry and mechanical measurement techniques. This project falls within the EPSRC Energy Storage research area in the Energy Theme.

该项目是关于锂离子电池中固态电解质（SSE）沉积和表征的新活动的一部分，并且将受益于与法拉第学院的Solbat项目（https://www.solbat-faraday.org/）密切相互作用。该项目将通过溅射和脉冲激光沉积（PLD）探索可靠的方法来生长有前景电解质材料的薄膜。研究材料的选择将由Solbat协作中的其他项目告知，并将包括具有石榴石结构，可能是硫化物的氧化物以及其他新颖的材料。可以改变广泛的参数（底物温度，气相压力，激光/溅射功率和组合物），以优化离子电导率以及确保膜均匀性的关键和难以控制的问题。这些特性最初将通过常规的电化学阻抗光谱（EIS）测量，XRD相纯度以及SEM进行的微结构分析和均匀性来测量。由于最近有证据表明它们具有令人惊讶的良好离子电导率，因此还将探索无定形薄膜材料的特性。 PLD过程是这项工作的理想选择，对由于变化的沉积参数很容易提供对结晶度的程度。这些无定形电解质也可能提供有趣的机会来管理各种SSE电池设计中Li Dendrite增长的严重问题。一旦建立了可再现的生长过程，该项目的第二阶段将是研究控制完整电池性能的电解质/电极相互作用。所采用的方法将是电极和电解质材料的顺序沉积，电子显微镜和次级离子质谱（SIMS）技术，用于研究热处理后的化学和形态相互作用，然后在当前的对称结构循环后进行。还将探索在多层样品和使用钻石光源的完整电池结构上进行原位和奥塞兰多实验。该项目的总体目的是根据薄膜策略为Solbat项目提供原型电池制造的途径。在英国没有目前的工作，在国际上很少发表关于薄膜电解质的作品，在这些材料中根本没有关于界面反应和降解机制的作品，因此提出的研究方法具有很高的新颖性。该学生将与Solbat团队，牛津大学和合伙大学的其他成员紧密合作，因此在互补的电化学和机械测量技术中获得宝贵的经验。该项目属于能源主题的EPSRC储能研究领域。