Strategies for improving cathode electrolyte interphase in high-performance dual-ion batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Dual-ion batteries (DIBs) offer high energy density by utilizing both anion and cation intercalation.
• Graphite is a cost-effective cathode material for DIBs but exhibits low discharge capacity and poor cycling stability.
• The cathode electrolyte interphase (CEI) on graphite is critical for anion storage and overall DIB stability.

Purpose of the Study:

• To review strategies for enhancing the cathode electrolyte interphase (CEI) in dual-ion batteries (DIBs).
• To address the limitations of graphite cathodes, including low capacity and poor cycling stability.
• To provide insights for future research in CEI development for improved DIB technology.

Main Methods:

• Review of existing literature on CEI formation and modification in DIBs.
• Analysis of strategies including additives, binders, electrolytes, doping, artificial CEI, and surface modifications.
• Evaluation of CEI improvements in terms of anion transport, solvation, and structural stability.

Main Results:

• Various strategies can significantly enhance the quality of the CEI layer on graphite cathodes.
• Improved CEI facilitates faster anion transport and better anion solvation.
• Enhanced CEI contributes to increased structural stability of graphite cathodes.

Conclusions:

• Enhancing the CEI is crucial for overcoming the capacity and stability limitations of graphite cathodes in DIBs.
• Optimizing CEI components and modification strategies is vital for advancing DIB technology.
• Further research into CEI materials and improvement techniques will accelerate DIB development.