Liu Yanfang, Shi Yating, Gao Caitian, Shi Zude, Ding Hongbo, Feng Yanhong, He Yongmin, Sha Junwei, Zhou Jiang, Lu Bingan
School of Physics and Electronics, Hunan University, Changsha, P. R. China.
School of Materials Science and Engineering and Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin, 300350, P. R. China.
Angew Chem Int Ed Engl. 2023 Apr 11;62(16):e202300016. doi: 10.1002/anie.202300016. Epub 2023 Mar 6.
Recharging batteries operate at sub-zero temperature is usually limited by the slow ion diffusion and uneven charge distribution at low temperature. Here, we report a strategy to regulate electric field and thermal field simultaneously, creating a fast and uniform deposition surroundings for potassium ion in potassium metal batteries (PMBs). This regulation is achieved by using a highly ordered 1D nanoarray electrode which provides a dense and flat surface for uniforming the electric field and high thermal conductivity for reducing the temperature fluctuation. Consequently, this electrode could achieve high-areal capacity of 10 mAh cm . Besides, the dependence of potassium nucleation on temperature is unveiled. Furthermore, a full-cell could steady operate with over 80 % of its room-temperature capacity at -20 °C. Those respectable performances demonstrate that this strategy is valid, potentially providing guidelines for the rational design of advanced electrodes toward PMBs.
在零下温度下充电的电池通常受到低温下离子扩散缓慢和电荷分布不均的限制。在此，我们报告了一种同时调节电场和热场的策略，为钾金属电池（PMB）中的钾离子创造快速且均匀的沉积环境。这种调节是通过使用高度有序的一维纳米阵列电极实现的，该电极提供致密且平坦的表面以使电场均匀，并具有高导热性以减少温度波动。因此，该电极可实现10 mAh cm的高面积容量。此外，揭示了钾成核对温度的依赖性。此外，全电池在-20°C下能够以超过其室温容量80%的水平稳定运行。这些优异的性能表明该策略是有效的，有可能为面向PMB的先进电极的合理设计提供指导。
