钠离子电池有机正极补钠剂研究进展OA

Pre-sodiation technology for sodium-ion batteries provides an additional source of active sodium ions to compensate for irreversible sodium ion loss at the anode during the first cycle.It thus improves cathode active material utilization efficiency and alleviates low energy density.Among various pre-sodiation techniques,organic sacrificial salts in cathodes are particularly attractive owing to their high environmental adaptability and no strict humidity control,making them suitable for large-scale application.This review focuses on organic sacrificial salts in cathodes,systematically surveying and analyzing the relevant literature.Based on functional groups,these organic sacrificial salts are categorized into sodium carboxylates and sodium phenoxides.Key characteristics of each type are introduced,and comparative analysis is performed using metrics such as specific capacity,decomposition voltage,reaction products,and raw material cost,thereby highlighting their strengths and limitations.Particular attention is given to sodium carboxylates,one of the most extensively studied classes,with in-depth discussion of their compensation mechanism,including sodium ion release,organic anion oxidation,and subsequent structural rearrangement,to clarify their operational principles.Critical challenges associated with organic sacrificial salts in cathodes,including gas evolution and residue formation during decomposition,are also addressed.Mainstream performance-enhancement strategies,such as carbon compositing to improve electrical conductivity,nanonization to boost reactivity,and double-layer coating to reinforce electrode stability,are summarized.These approaches offer viable routes to optimize the performance and practicality of organic sacrificial salts in cathodes.Finally,we propose design principles for future organic sacrificial salts in cathodes,emphasizing performance,process compatibility,and cost,to guide further research and development in this field.