review · Batteries
Conventional battery electrolytes often rely on hazardous and flammable solvents that present serious safety risks and potential threats to soil and water ecosystems. Deep eutectic solvents, formed by combining two or more compounds, offer an environmentally friendly alternative. In particular, urea serves effectively as a hydrogen bond donor within these systems. Integrating urea into deep eutectic solvent electrolytes improves ion transport, broadens electrochemical stability windows, and extends battery cycle life. Furthermore, urea provides low toxicity, reduced flammability, and elevated thermal stability. These formulations have undergone laboratory evaluation across multiple energy storage systems, including aluminium-ion, sodium-ion, and zinc-ion battery architectures. Understanding the molecular interactions, structural characteristics, and preparation methods of urea-based electrolytes is central to advancing safer battery chemistries.
Modern batteries require safer, greener chemical components to prevent fire hazards and reduce ecological damage caused by toxic waste. Replacing combustible, hazardous solvents with stable, non-toxic alternatives derived from common chemicals like urea supports the development of sustainable energy storage systems. This shift is crucial for improving battery safety standards while maintaining strong electrochemical performance across diverse battery types.
This technology could enable safer, less hazardous energy storage products for battery manufacturers developing aluminium-ion, sodium-ion, and zinc-ion systems. The non-toxic and low-flammability properties offer a clear path toward meeting stricter environmental and safety standards. However, because current evidence reflects laboratory-scale testing and foundational reviews of preparation methods and mechanisms, the technology remains at an early research stage, requiring further engineering and scale-up before commercial deployment.
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Urea, a basic chemical compound, holds diverse applications across numerous domains, ranging from agriculture to energy storage. Of particular interest is its role as a hydrogen bond donor (HBD). This specific characteristic has propelled its utilization as an essential component in crafting deep eutectic solvents (DESs) for battery electrolytes. Incorporating urea into DESs presents a promising avenue to address environmental concerns associated with traditional electrolytes, thereby advancing battery technology. Conventional electrolytes, often composed of hazardous and combustible solvents, pose significant environmental risks upon improper disposal potentially contaminating soil and water and threatening both human health and ecosystems. Consequently, there is a pressing need for eco-friendly alternatives capable of upholding high performance and safety standards. DESs, categorized as organic salts resulting from the blending of two or more compounds, have emerged as promising contenders for the next generation of electrolytes. Urea stands out among DES electrolytes by enhancing ion transport, widening the electrochemical window stability (ESW), and prolonging battery cycle life. Further, its non-toxic nature, limited flammability, and elevated thermal stability play pivotal roles in mitigating environmental concerns and safety issues associated with traditional electrolytes. Laboratory testing of urea-based DES electrolytes across various battery systems, including Al-ion, Na-ion, and Zn-ion batteries, has already been demonstrated. This review examines the evolution of urea-based DES electrolytes by elucidating their structure, molecular interaction mechanisms, performance attributes, and preparation methodologies.
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DOI: 10.3390/batteries10020045
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