Synthesis and characterization of paper-like, nanostructured electrodes for advanced secondary batteries

用于先进二次电池的纸状纳米结构电极的合成和表征

• 批准号: 208744363
• 负责人: Professor Dr. Joachim Bill
• 金额: --
• 依托单位: Abteilung Chemische Materialsynthese
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/208744363?language=en
• 关键词: Synthesis; characterization; paper; like; nanostructured

The major task of the present project is the development of paper-like electrodes with improved performance for use in Li-ion batteries. The layered architecture of these nanocomposites is envisioned to simultaneously exploit the extraordinary mechanical/chemical stability and electrical conductivity of graphene and the efficient lithium ion storage capability of inorganic nanostructures, in order to enhance the charge-discharge kinetics and lifetime of the electrodes. In the first project period, the self-assembly of V2O5 nanofibers was improved to yield tough and flexible paper-like films, and the other required inorganic components SnO2 nanosheets/-fibers and LiMnPO4 nanoplatelets were successfully synthesized and characterized. Importantly, it could be proven in particular for composites comprising V2O5 nanofibers and graphene oxide (GO) that the implementation of graphene sheets indeed leads to improved mechanical stability, electrical conductivity and actuation properties. Moreover, a correlation was observed between the structural quality of these composites and their mechanical performance. On this basis, the second project stage aims at completing the synthesis and characterization of the three different types of composites, including the investigation of films with alternating layer structure. A major focus will be on determining the films' mechanical and electrochemical properties in dependence of the content, distribution and reduction extent of the incorporated GO. Another central task is the detailed evaluation of the impact of electrochemical cycling on the micro- and nanostructure as well as mechanical performance for the electrodes. In this manner, valuable insights shall be gained into the major mechanisms responsible for electrochemical performance degradation of such type of Li-ion electrodes. Of particular relevance in this respect will be the influence of parameters such as the volume fraction of graphene and the inorganic nanostructures, as well as the interfacial coupling between the two components.

本项目的主要任务是开发类似纸张的电极，并改善了用于锂离子电池的性能。设想这些纳米复合材料的分层结构可以同时利用石墨烯的非凡机械/化学稳定性以及无机纳米结构的有效锂离子存储能力，以增强电荷 - 释放性动力学动力学和电极的生命周期。在第一个项目时期，改进了V2O5纳米纤维的自组装，以产生坚固而柔性的纸张膜，另一个必需的无机组件SNO2纳米片/纤维和limnpo4纳米纤维片成功合成并进行了表征。重要的是，对于包含V2O5纳米纤维和氧化石墨烯（GO）的复合材料，可以证明它可以证明它确实可以改善机械稳定性，电导率和启动性能。此外，这些复合材料的结构质量与其机械性能之间观察到了相关性。在此基础上，第二个项目阶段旨在完成三种不同类型的复合材料的合成和表征，包括研究具有交替层结构的膜。主要的重点将是确定膜的机械和电化学特性，以依赖于掺入的GO的内容，分布和还原范围。另一个核心任务是对电化学循环对微结构的影响以及电极的机械性能的详细评估。以这种方式，应获得有价值的见解，以使这种类型的锂离子电极的电化学性能降解的主要机制获得。在这方面，特别相关的是参数的影响，例如石墨烯和无机纳米结构的体积分数，以及两个组件之间的界面耦合。