Rational Design of Functional Electrolytes Towards Commercial Dual‐Ion Batteries

• Published in: ChemSusChem Vol. 16; no. 4; pp. e202201561 - n/a
• Main Authors: Jiang, Hongzhu, Chen, Zheng, Yang, Yuanyuan, Fan, Cheng, Zhao, Jingwen, Cui, Guanglei
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 20.02.2023
• Subjects: Anions; Batteries; dual-ion batteries; electrochemistry; Electrolytes; energy density; Energy storage; Ion currents; Oxidation; Stability analysis; energy density; dual-ion batteries; electrochemistry; electrolytes; energy storage
• ISSN: 1864-5631; 1864-564X; 1864-564X
• DOI: 10.1002/cssc.202201561

Dual‐ion batteries (DIBs) based on anion (de)intercalation into low‐cost graphitic carbon cathodes hold great promise in grid‐scale energy storage. Different from the electrolyte in rocking‐chair batteries, which only serves as a charge transporter, both cations and anions in the electrolyte for DIBs participate in battery reactions. Hence, the impact of the electrolyte formulation on cycle life, energy density, as well as cost has become a subject of vital importance. This review discussed the challenges and recent progress of electrolytes for DIBs, with a particular focus on the exploration of electrolytes with high oxidation stability, high salt concentration, high ionic conductivity, and low cost. Moreover, the influence of varied ion concentrations at different state‐of‐charge levels on the electrolyte properties such as ionic conductivity and electrochemical stability is analyzed. Finally, perspectives on the current limitations and future research directions of electrolytes for DIBs are provided. Electrolytes for long life: Dual‐ion batteries (DIBs) hold great promise in grid‐scale energy storage. Focusing on electrolytes as important components of cells, this Review summarizes the research progresses of enhancing coulombic efficiencies and limited life of DIBs based on high voltage. Moreover, the challenges such as energy density and cost, and perspectives of DIBs for practical application are analyzed in detail.