Graphite (Gr) has been considered as the most promising anode material for potassium-ion batteries (PIBs) commercialization due to its high theoretical specific capacity and low cost. However, Gr-based PIBs remain unfeasible at low temperature (LT), suffering from either poor kinetics based on conventional carbonate electrolytes or K+-solvent co-intercalation issue based on typical ether electrolytes. Herein, a high-performance Gr-based LT rechargeable PIB is realized for the first time by electrolyte chemistry. Applying unidentate-ether-based molecule as the solvent dramatically weakens the K+-solvent interactions and lowers corresponding K+ de-solvation kinetic barrier. Meanwhile, introduction of steric hindrance suppresses co-intercalation of K+-solvent into Gr, greatly elevating operating voltage and cyclability of the full battery. Consequently, the as-prepared Gr||prepotassiated 3,4,9,10-perylene-tetracarboxylicacid-dianhydride (KPTCDA) full PIB can reversibly charge/discharge between −30 and 45 °C with a considerable energy density up to 197 Wh kgcathode−1 at −20 °C, hopefully facilitating the development of LT PIBs.
Liwei Cheng, Hao Lan, Yong Gao, Shuai Dong, Yingyu Wang, Mengyao Tang, Xinyu Sun, Wenrui Huang, Hua Wang*. Realizing Low-Temperature Graphite-based Rechargeable Potassium-Ion Full Battery. Angew. Chem. Int. Ed. 2024, e202315624.
https://doi.org/10.1002/anie.202315624
