原子尺度锂离子电池电极材料的近平衡结构

Atomic-scale structure of nearly-equilibrated electrode materials under lithiation/delithiation for lithium-ion batteries

锂离子电池充放电过程中电极材料的结构变化与材料的电化学反应机理和性能密切相关.通过在原子尺度上直接观察脱/嵌锂前后电极材料的近平衡微观结构,有助于从更深层次认识电极反应机理和性能演化规律,对于全面理解材料的电化学行为以及改善锂离子电池性能具有重要的指导意义.本文详述了球差校正扫描透射成像技术在研究电极材料表界面结构及反应机理方面的进展,探讨了未来建立电极材料原子尺度结构与性能相关联可能的研究方向.

The close relationship between microstructure evolution of electrode materials for lithium-ion batteries during charging/discharging and the corresponding reaction mechanism has urged great efforts to acquire detailed microstructure information at atomic scale enabling improved understanding for reaction mechanism and electrode degradation. Here we summarize the recent progress on investigation of the atomic-level structure in lithiated/ delithiated electrode materials and their reaction mechanism via aberration-corrected scanning transmission electron microscopy （STEM）. Possible future prospectives are also envisaged and discussed.