Aqueous zinc (Zn)-ion energy storage system is widely regarded as a promising candidate for future electrochemical energy storage applications but suffers insufficient lifespan and limited operating temperature. To address these issues, we introduce a carbitol additive for a novel hybrid electrolyte to enhance cycling stability and temperature adaptability by optimizing the coordination structure of Zn ion. The modified electrolyte not only restrains the hydrogen evolution, but also promotes a high-orientation Zn deposition and significantly limits the Zn dendrite growth. Taking advantage of improved electrolyte properties, the Zn symmetric cells with 10 % carbitol-modified electrolyte exhibit long-term cycle stability for 5000 h at 25 °C, and 400 h at -10 °C. More notably, the carbitol-modified electrolyte endows a stable reversible capacitance for Zn ion hybrid supercapacitors to be operated at different temperatures. Our work affords a reasonable electrolyte engineering strategy to fabricate a highly stable and low-temperature-tolerant Zn ion storage system.
Keywords: Carbitol; Electrolyte additive engineering; Low-temperature performances; Solvation structure; Zn ion hybrid supercapacitor.
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