Yang Qian, Zhou Xunzhu, Huang Tingting, Chen Zhuo, Zhang Yu, Shi Shuo, Zhang Wen, Li Lin, Wang Jiazhao, Dou Shixue, Lei Kaixiang, Zheng Shijian
State Key Laboratory of Reliability and Intelligence of Electrical Equipment, School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300401, China.
Institute for Carbon Neutralization Technology, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, China.
Angew Chem Int Ed Engl. 2025 Mar 17;64(12):e202422259. doi: 10.1002/anie.202422259. Epub 2024 Dec 20.
Low-concentration electrolytes (LCEs) have attracted great attention due to their cost effectiveness and low viscosity, but suffer undesired organic-rich interfacial chemistry and poor oxidative stability. Herein, a unique latent solvent, 1,2-dibutoxyethane (DBE), is proposed to manipulate the anion-reinforced solvation sheath and construct a robust inorganic-rich interface in a 0.5 M electrolyte. This unique solvation structure reduces the desolvation energy, facilitating rapid interfacial kinetics and K intercalation in graphite. Additionally, enhanced anion-cation interactions promote the formation of a thin and robust interfacial layer with excellent cycling performance of potassium-ion batteries (PIBs). Graphite||perylene-3,4,9,10-tetracarboxylic dianhydride full cell exhibits a good capacity retention of 80.3 % after 300 cycles, and delivers a high discharge capacity of 131.3 mAh g even at 500 mA g. This study demonstrates the feasibility of latent solvent-optimized electrolyte engineering, providing a pathway of superior electrochemical energy storage in PIBs.
