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source:Industry News release time:2025-09-04 Hits: Popular:AG11 battery

The safety evaluation of lithium battery electrolytes is of paramount importance as electrolytes play a crucial role in the operation of lithium - ion batteries while also posing potential safety risks. Lithium battery electrolytes are typically composed of organic solvents and lithium salts, and their properties can significantly impact the safety, performance, and lifespan of the battery.
One of the key aspects of electrolyte safety evaluation is assessing its flammability. Organic solvents used in electrolytes, such as ethylene carbonate, propylene carbonate, and dimethyl carbonate, are flammable, and in the event of a battery failure, such as thermal runaway or short - circuit, there is a risk of fire. To evaluate flammability, various tests are conducted, including the flash - point test, which determines the lowest temperature at which the electrolyte can vaporize to form an ignitable mixture with air. A lower flash - point indicates a higher flammability risk. Additionally, combustion tests are performed to study the behavior of the electrolyte when exposed to an ignition source, such as the rate of flame spread and the amount of heat released. Understanding the flammability characteristics helps in designing safer battery systems and developing strategies to prevent or mitigate fire hazards.
Another important factor in electrolyte safety evaluation is its chemical stability. Electrolytes need to be stable under normal operating conditions as well as during extreme conditions, such as high temperatures or overcharging. Chemical reactions between the electrolyte and the battery electrodes can lead to the formation of gas, the degradation of electrode materials, and the reduction of battery performance. To evaluate chemical stability, accelerated aging tests are carried out, where the electrolyte is exposed to elevated temperatures and voltages for an extended period. The changes in the electrolyte's composition, such as the formation of by - products or the decomposition of lithium salts, are analyzed using techniques like gas chromatography - mass spectrometry (GC - MS) and nuclear magnetic resonance (NMR) spectroscopy. By identifying unstable components or reaction pathways, researchers can develop more stable electrolytes or modify the battery design to enhance safety.
The compatibility of the electrolyte with the battery components, including the electrodes, separators, and battery casing materials, is also a critical aspect of safety evaluation. Incompatibility can lead to corrosion of the electrodes, degradation of the separator's performance, or leakage of the electrolyte, all of which can compromise the safety of the battery. Compatibility testing involves exposing the battery components to the electrolyte under various conditions and monitoring for any signs of degradation, such as changes in electrical resistance, physical appearance, or mechanical properties.
Furthermore, the toxicity of lithium battery electrolytes needs to be evaluated, especially in cases where the battery may be disposed of or in the event of leakage. Some components of the electrolyte, such as certain lithium salts and additives, may have potential toxic effects on the environment and human health. Toxicity testing includes assessing the impact of the electrolyte on aquatic organisms, soil microorganisms, and mammalian cells. By conducting comprehensive safety evaluations of lithium battery electrolytes, it is possible to develop safer electrolytes, improve battery designs, and ensure the overall safety of lithium - ion battery - based products throughout their life cycle.
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