Bridging Donor Ligands Enable an Ultrastable Graphite Anode for Sodium‐Ion Batteries
Abstract
Abstract Graphite is widely utilized as an anode material in lithium‐ion batteries due to its abundance, cost‐effectiveness, and excellent structural stability during lithium intercalation and deintercalation, which contribute to a long cycle life. However, graphite is not inherently suitable for sodium‐ion batteries (SIBs) due to the limited intercalation properties of sodium ions. To address this, we propose the concept of bridging‐donor‐ligands, which construct ligand channels and consistently expand the graphite interlayer spacing. Using sodium dicyandiamide (NaDCA) as a model ligand, we demonstrate the formation of abundant ligand channels facilitated by the versatile dicyanamide anion (DCA − ), significantly enhancing the structural robustness of ternary graphite intercalation compounds (t‐GICs). Hence, the graphite anode capacity retention is over 94% after 5000 cycles, with an average Coulombic efficiency (CE) exceeding 99.8% in SIBs. This mechanism is versatile and can be extended to other metal‐ion battery electrolytes.
Article Details
Authors (9)
Bingyan Song
Confucius Energy Storage Lab, School of Energy and Environment & Z Energy Storage Center Southeast University Nanjing Jiangsu 211189 China
Zhifen Luo
Confucius Energy Storage Lab, School of Energy and Environment & Z Energy Storage Center Southeast University Nanjing Jiangsu 211189 China
Xi Liu
School of Chemistry and Chemical Engineering
Yi Peng
Department of Pharmacology, School of Pharmacy, China Medical University
Jie Wang
State Key Laboratory of Molecular Oncology, Beijing Key Laboratory, CAMS Key Laboratory of Translational Research on Lung Cancer, Department of Medical Oncology Cancer Hospital, Chinese Academy of Medical Sciences Beijing China
Feng Jiang
State Key Laboratory of Integrated Optoelectronics, JLU Region, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China
Xin‐Bing Cheng
Confucius Energy Storage Lab, School of Energy and Environment & Z Energy Storage Center Southeast University Nanjing Jiangsu 211189 China
Yuping Wu
Confucius Energy Storage Lab, School of Energy and Environment & Z Energy Storage Center
Jiarui He
Confucius Energy Storage Lab, School of Energy and Environment & Z Energy Storage Center Southeast University Nanjing Jiangsu 211189 China