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用于锂离子电池的具有改进性能的纸状电极。这些纳米复合材料的分层结构被设想为同时利用石墨烯的非凡的机械/化学稳定性和导电性以及无机纳米结构的有效锂离子存储能力，以增强电极的充放电动力学和寿命。在第一个项目期间，改进了V2 O 5纳米纤维的自组装以产生坚韧和柔性的纸状薄膜，并且成功地合成和表征了其他所需的无机组分SnO 2纳米片/纤维和LiMnPO 4纳米片。重要的是，可以证明，特别是对于包含V2 O 5纳米纤维和氧化石墨烯（GO）的复合材料，石墨烯片的实施确实导致改善的机械稳定性、导电性和致动特性。此外，观察到这些复合材料的结构质量和它们的机械性能之间的相关性。在此基础上，第二个项目阶段旨在完成三种不同类型复合材料的合成和表征，包括对交替层结构薄膜的研究。一个主要的焦点将是确定薄膜的机械和电化学性能的依赖于所纳入的GO的含量，分布和还原程度。另一个中心任务是详细评估电化学循环对微结构和纳米结构的影响以及电极的机械性能。以这种方式，将获得有价值的见解的主要机制负责这种类型的锂离子电极的电化学性能退化。在这方面特别相关的将是参数的影响，例如石墨烯和无机纳米结构的体积分数，以及两种组分之间的界面耦合。