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首页> 外文会议>International Advanced Automotive Battery Conference(AABC) and Ultracapacitor Conference; 20060517-19; Baltimore,MD(US) >Detrimental Surface Films on Electrode Materials: Investigation and Inhibition
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Detrimental Surface Films on Electrode Materials: Investigation and Inhibition

机译：电极材料上的有害表面膜：研究和抑制

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摘要

One of the significant problems with lithium-ion batteries is their poor calendar life and stability at elevated temperatures. Investigations into the source of performance loss during accelerated aging experiments have focused on the interfaces of the electrode particles and the electrolyte. While it is known that electrolytes have poor thermal stability at elevated temperatures (50 - 100 ℃), the reactions of the electrolyte with the anode SEI and the surface of cathode particles are the most likely sources for capacity loss and increased impedance. Developing batteries with extended lifetimes (> 10 years) at room temperature and stability at moderately elevated temperatures (50-100 ℃) requires an understanding of the aging mechanisms and the development of stabilizing additives. Reactions of the electrolyte with the surface of electrode particles, both cathode and anode, have been conducted. The source of detrimental surface film formation is related to the thermal instability of LiPF_6. Upon storage at elevated temperature LiPF_6 dissociates to form LiF and the strong Lewis acid PF_5. Lewis basic stabilizing additives have been developed that inhibit the formation of detrimental surface films and improve the performance of lithium-ion cells stored at elevated temperature (> 50 ℃).
机译：锂离子电池的主要问题之一是它们的日历寿命差以及在高温下的稳定性。在加速老化实验过程中，性能损失的根源已经集中在电极颗粒和电解质的界面上。众所周知，电解质在高温（50-100℃）下的热稳定性较差，但电解质与阳极SEI和阴极颗粒表面的反应最可能导致容量损失和阻抗增加。要开发在室温下具有较长使用寿命（> 10年）并在中等温度（50-100℃）下具有稳定性的电池，需要了解其老化机理和稳定添加剂的开发。已经进行了电解质与电极颗粒的表面（阴极和阳极）的反应。有害表面膜形成的来源与LiPF_6的热不稳定性有关。在高温下储存后，LiPF_6分解形成LiF和强路易斯酸PF_5。已开发出路易斯碱性稳定添加剂，该添加剂可抑制有害表面膜的形成并改善在高温（> 50℃）下存储的锂离子电池的性能。

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