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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental study on flammability limits of electrolyte solvents in lithium-ion batteries using a wick combustion method
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Experimental study on flammability limits of electrolyte solvents in lithium-ion batteries using a wick combustion method

机译：芯燃烧法的锂离子电池电解液溶剂可燃性限制的实验研究

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To quantify the flammability limits of organic electrolyte solvents used in lithium-ion batteries, a unique wick combustion system was developed in conjunction with limiting oxygen concentration (LOC) of candle-like flame, named wick-LOC method. By controlling the oxygen-nitrogen ratio of external flow of the wick diffusion flame, the flammability limits (LOC) of electrolyte solvents were determined experimentally. To provide reproducible results under specified conditions, the effects of axial flow velocity, exposed wick length and elapsed time after ignition on the wick-LOC were studied, and the proper experimental conditions were selected for further applications. To validate the reliability of wick-LOC in flammability evaluation, correlation analyses to other flammability properties (flash point, auto-ignition temperature, the heat of combustion and other types of LOC) were conducted. The wick-LOC method was then applied to quantify the flammability of mixed solvents. The linear changes of wick-LOC with mixing ratios were found in the mixture of linear and cyclic carbonates, while the non-linear trends were found in carbonate-ether mixed solvents. To evaluate the flame-retardant effectiveness of organophosphorus compounds (OPCs) as additives in electrolyte solvents, a series of tests were conducted. Results showed that small amounts of OPCs had significant flame-retardant effects, but the efficiency decreased with the higher OPC additions. The effectiveness of four OPCs was distinguished as well. The results of this work provided valuable information about the flammability limits of single and mixed electrolyte solvents, and it may be useful for designing electrolyte balanced in both performance and safety.
机译：为了量化锂离子电池中使用的有机电解质溶剂的可燃性限制，可以结合限制蜡烛状火焰的限制氧浓度（LOC）来开发独特的芯片燃烧系统。通过控制芯散射火焰的外部流动的氧 - 氮比，实验确定电解质溶剂的可燃性限制（LOC）。为了在指定条件下提供可重复的结果，研究了轴向流速，暴露在芯背-COC上点火后的芯片长度和经过时间的效果，选择了适当的实验条件以进行进一步的应用。为了验证可燃性评估中芯-SC的可靠性，对其他可燃性特性（闪点，自动点火温度，燃烧热和其他类型的LOC）进行相关性分析。然后施用芯基-SC法以量化混合溶剂的易燃性。在线性和环碳酸酯的混合物中发现了用混合比的灯芯LIC的线性变化，而在碳酸盐 - 醚混合溶剂中发现了非线性趋势。为了评估有机磷化合物（OPC）作为电解质溶剂中添加剂的阻燃效果，进行了一系列测试。结果表明，少量OPCs具有显着的阻燃效果，但效率降低了较高的OPC添加。四种OPCS的有效性也有所不同。该工作的结果提供了有关单一和混合电解质溶剂的可燃性限制的有价值的信息，可用于在性能和安全性方面设计电解质。

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