fig1

Figure 1. Chronicle of the developments for K-S batteries. (A) The number of papers published each year relevant to “Potassium-sulfur batteries” from 2014 to 2026. (B) Significant research achievements in the development of K-S batteries (Reproduced with permission from^[23]. Copyright 2014, American Chemical Society Reproduced with permission from^[24]. Copyright 2015, Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Reproduced with permission from^[25]. Copyright 2018, American Chemical Society Reproduced with permission from^[26]. Copyright 2019, American Chemical Society Reproduced with permission from^[27]. Copyright 2020, American Chemical Society Reproduced with permission from^[28]. Copyright 2021, American Chemical Society Reproduced with permission from^[29]. Copyright 2022, Wiley-VCH GmbH Reproduced with permission from^[30]. Copyright 2023, Wiley-VCH GmbH Reproduced with permission from^[31]. Copyright 2024, Springer Nature Reproduced with permission from ^[32]. Copyright 2025, Wiley-VCH GmbH).