Li-modified BaCoO3−δ for thermochemical energy storage: enhanced reaction performance and modification mechanism

A novel Li x Ba 1− x CoO 3− δ solid solution achieves a heat storage density of 348.4 kJ kg −1 , driven by Li-induced surface oxygen vacancies enhancing redox activity between 600 and 900 °C. The role of Li is elucidated in this study.