Mengkang Shen, Zhongqin Dai, Ling Fan, Hongwei Fu, Yuanhui Geng, Jie Guan, Fanfei Sun, Apparao M Rao, Jiang Zhou, Bingan Lu
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引用次数: 0
摘要
传统电解质抗氧化性差,阻碍了高压钾离子电池技术的发展。在此,我们提出了一种共溶剂电解质设计策略,以克服钾离子电解质化学成分的高电压限制。共溶剂电解质通过离子-偶极子相互作用打破了盐的溶解限制,显著扩大了富含阴离子的溶解簇,这一点已在原位同步加速器广角 X 射线散射实验中得到验证。此外,大的富阴离子溶解簇还有助于形成有效的电解质间相,从而提高与高压电极的兼容性。这种共溶剂电解质可使 K||普鲁士蓝电池(2-4.5 V)工作超过 700 个循环,容量保持率高达 91.9%。我们的共溶剂电解质设计策略为高压钾离子电池及其他电池的开发铺平了新的道路。
Cosolvent electrolyte chemistries for high-voltage potassium-ion battery.
The poor oxidation resistance of traditional electrolytes has hampered the development of high-voltage potassium-ion battery technology. Here, we present a cosolvent electrolyte design strategy to overcome the high-voltage limitations of potassium-ion electrolyte chemistries. The cosolvent electrolyte breaks the dissolution limitation of the salt through ion-dipole interactions, significantly enlarging the anion-rich solvation clusters, as verified by the insitu synchrotron-based wide-angle X-ray scattering experiments. Furthermore, the large anion-rich solvation clusters also facilitate the formation of an effective electrode-electrolyte interphase, thereby enhancing compatibility with high-voltage electrodes. The cosolvent electrolyte enables K||Prussian blue cells (2-4.5 V) to operate for >700 cycles with a capacity retention of 91.9%. Our cosolvent electrolyte design strategy paves new avenues for the development of high-voltage potassium-ion batteries and beyond.
期刊介绍:
National Science Review (NSR; ISSN abbreviation: Natl. Sci. Rev.) is an English-language peer-reviewed multidisciplinary open-access scientific journal published by Oxford University Press under the auspices of the Chinese Academy of Sciences.According to Journal Citation Reports, its 2021 impact factor was 23.178.
National Science Review publishes both review articles and perspectives as well as original research in the form of brief communications and research articles.