Improving accessible Li-ion cathode capacity through morphological control

通过形态控制提高锂离子正极容量

• 批准号: 2786009
• 金额: --
• 依托单位: University of Sheffield
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2786009
• 关键词: Improving; accessible; Li; ion; cathode

Morphology-function relationships have been successfully exploited in many areas of oxide synthesis, including for cathode materials across the Li and Na-ion fields. Despite its relatively recent development, NMC811 has been synthesised by a variety of methods including hydrothermal and sol-gel. Although these methods give some control over particle size, they offer no control of crystal shape, which could be exploited to aid Li (de)intercalaction, and tend to produce heavily agglomerated particles. These can suffer from cracking and areas of inaccessible Li, and so there is space for improvement of these types of cathode through control of crystallite shape to minimise these effects.Biotemplating, the use of biologically derived long-chain polymers to control crystallisation during calcination, is a technique which enables such control of morphology. The technique has been successfully used to create nano- and micron-scale structures in a wide variety of oxides. It has been shown to control particle shape whilst reducing the energy required for production, although this was without targeted shape control.This project will seek to improve specific capacity and mechanical stability through targeted control of crystallite morphology in NMC811 and related materials using biotemplating and similar techniques. Specific shapes e.g. nanowires or hollow polycrystalline spheres will be synthesised and characterised. There will be scope for materials to be informed by WP1 and 3 of FutureCat, and will link well into the novel manufacturing of electrodes in WP5 which will seek scalable primary or secondary particle feedstocks which can accommodate volume changes during cycling. This also links into other projects such as CatMat and NEXGENNa, where similar cathode materials could benefit from these types of synthesis methods. We will use the synthesis, powder scale-up and characterisation facilities available in the Materials department and the Royce at Sheffield.

形态-功能关系已成功地应用于氧化物合成的许多领域，包括Li和Na离子领域的阴极材料。尽管其相对较新的发展，但NMC 811已通过多种方法合成，包括水热和溶胶-凝胶。尽管这些方法对颗粒尺寸进行了一定的控制，但它们没有提供对晶体形状的控制，而晶体形状可用于帮助Li（脱）插层，并且倾向于产生严重团聚的颗粒。这些可能遭受开裂和难以接近的Li区域，因此存在通过控制微晶形状以最小化这些影响来改进这些类型的阴极的空间。生物模板化，使用生物衍生的长链聚合物来控制煅烧期间的结晶，是一种能够实现这种形态控制的技术。该技术已成功地用于在各种氧化物中创建纳米和微米级结构。该项目旨在通过生物模板和类似技术，有针对性地控制NMC 811和相关材料中的微晶形态，从而提高比容量和机械稳定性。将合成和表征特定形状，例如纳米线或中空多晶球。FutureCat的WP 1和WP 3将提供材料范围，并将很好地与WP 5中的新型电极制造联系起来，WP 5将寻求可扩展的初级或次级颗粒原料，这些原料可以适应循环过程中的体积变化。这也与CatMat和NEXGENNa等其他项目有关，在这些项目中，类似的阴极材料可以从这些类型的合成方法中受益。我们将使用谢菲尔德的材料部门和Royce提供的合成、粉末放大和表征设施。