Mechanisms and Mitigation Strategies of Gas Generation in Sodium-Ion Batteries

• Gas generation in sodium-ion batteries originates from cathode instability, electrode-electrolyte side reactions, and electrolyte decomposition, producing CO2, H2, and O2. • Mitigation strategies include electrolyte design, buffer layer construction, and electrode material optimization to enhance safety. • Long-term high-precision gas detection is crucial for improving SIB safety and performance. • SIBs are promising for large-scale energy storage and electric vehicles due to cost-effectiveness and abundant sodium resources.