铝合金型负极材料储锂机理和衰减机制的原位电化学透射电子显微镜分析研究

锂离子电池具有高能量密度、高功率密度、长循环寿命和环境友好等优势，被广泛应用于便携式电子产品和电动汽车等领域。铝合金型负极材料在锂离子电池中具高容量、高能量密度以及高功率密度的潜力。但目前铝材料的倍率和循环稳定较差，其形貌、组分、结构与性能的内在联系以及在锂离子电池中的储锂机理和衰减机制尚未明确。为解决以上问题，本项目拟通过原位电化学透射电子显微镜技术深入研究铝合金型材料在锂离子电池中的储锂机理，并解析该类材料在循环过程中的衰减机制。在该项目中利用不同的合成方法对铝合金型负极材料的形貌、组分和结构进行调控，研究其形貌、组分、结构与性能的内在联系，实现可控制备具有高容量、大倍率以及长循环性能的锂离子电池铝合金型负极材料。本项目的实施不仅对锂离子电池铝合金型负极材料的结构设计具有指导作用，而且对开发绿色环保以及高性能的锂离子全电池储能器件具有重要参考价值。

Lithium-ion batteries (LIBs) are featured by high energy density, high power density, long service life and environmental friendliness and thus have found wide application in the area of consumer electronics. Aluminum alloy anode materials is one of the most attractive anode materials for LIBs due to its high theoretical specific capacity, excellent conductivity, abundance, and especially low cost. However, the rate performance and cycle stability of aluminum materials are inferior, and the internal relationship between its morphology/composition/structure and performance, as well as its lithium storage mechanism and capacity attenuation mechanism in LIBs are still not yet clear. In order to address the issues mentioned above, this project intends to utilize in-situ electrochemical transmission electron microscopy technology to deeply study the lithium storage mechanism of aluminum alloy anode materials in LIBs, as well as analyze the capacity attenuation mechanism during the cyclic process. In this project, firstly, aluminum alloy anode materials with different morphologies, components and structures are prepared through different synthesis methods. And then we will study the materials internal relationship between the morphology/composition/structure and performance. Finally, we are aiming at fabrication of LIBs with high capacity, long cycle, and high-rate performance by reasonably adjusting the structure of aluminum alloy anode materials. The implementation of this project not only has a guiding role in the design of aluminum alloy anode materials structure for lithium-ion batteries, but also has great significance reference for the development of green and environmentally friendly as well as high-performance LIBs energy storage devices.