Cosolvent electrolyte chemistries for high-voltage potassium-ion battery  

作　　者：Mengkang Shen Zhongqin Dai Ling Fan Hongwei Fu Yuanhui Geng Jie Guan Fanfei Sun Apparao M.Rao Jiang Zhou Bingan Lu 

机构地区：[1]School of Physics and Electronics,Hunan University,Changsha 410082,China [2]School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China [3]Shanghai Synchrotron Radiation Facility,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China [4]Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201204,China [5]Department of Physics and Astronomy,Clemson Nanomaterials Institute,Clemson University,Clemson SC 29634,USA [6]School of Materials Science and Engineering,Central South University,Changsha 410083,China [7]State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha 410082,China

出　　处：《National Science Review》2024年第11期166-176,共11页国家科学评论（英文版）

基　　金：supported by the National Natural Science Foundation of China(52372189,U20A20247 and 12205359);the National Key Research and Development Program of Ministry of Science and Technology(2022YFA1402504);the Science and Technology Innovation Program of Hunan Province(2023RC3109);the Natural Science Foundation of Hunan Province(2022JJ20011);the Fundamental Research Funds for the Central Universities(531118010861).

摘　　要：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 in situ 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.

关 键 词：potassium-ion battery cosolvent electrolyte HIGH-VOLTAGE anion-rich solvation large solvation clusters 

分 类 号：TM53[电气工程—电器] TB30[一般工业技术—材料科学与工程]