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首页> 外文期刊>RSC Advances >Towards an understanding of the role of hyper-branched oligomers coated on cathodes, in the safety mechanism of lithium-ion batteries
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Towards an understanding of the role of hyper-branched oligomers coated on cathodes, in the safety mechanism of lithium-ion batteries

机译：理解涂覆在阴极上的超支化低聚物在锂离子电池安全机制中的作用

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摘要

Self-terminated hyper-branched oligomers (STOBA) were coated and then melted on a Li(Ni0.4Co0.2Mn0.4) O-2 cathode to form a dense polymer film at high temperatures. The physical and structural changes of the polymer layer at different temperatures and charge conditions were investigated by nitrogen adsorption-desorption, X-ray photoelectron spectroscopy, resistance measurements, scanning electron microscopy, and solid-state Li-7-NMR and C-13-NMR spectroscopy in order to improve the understanding of the role of the STOBA layer in the enhancement of the safety mechanism of lithium ion batteries. The morphological change of the STOBA layer from the porous to nonporous state at the temperature of a thermal runaway of a battery was demonstrated. The change in the resistance values at high temperatures revealed that the STOBA coating is helpful for the prevention of internal short-circuiting and thermal runaway. Most importantly, the Li-7-NMR results acquired at a very high spinning speed (50 kHz) allow the monitoring of the subtle changes in the local environments of the Li+ ions and their interaction and mobility in the STOBA-cathode interface as functions of temperature and charge states. The combined characterization results improve the understanding of how the STOBA layer can contribute to the safety features of lithium ion batteries.
机译：涂覆自端接的超支化低聚物（STOBA），然后在Li（Ni0.4Co0.2Mn0.4）O-2阴极上熔融，在高温下形成致密的聚合物膜。通过氮吸附-解吸，X射线光电子能谱，电阻测量，扫描电子显微镜以及固态Li-7-NMR和C-13-C，研究了聚合物层在不同温度和电荷条件下的物理和结构变化。 NMR光谱学是为了增进对STOBA层在增强锂离子电池安全机制中作用的认识。证实了STOBA层在电池的热失控温度下​​从多孔状态到无孔状态的形态变化。高温下电阻值的变化表明，STOBA涂层有助于防止内部短路和热失控。最重要的是，以很高的旋转速度（50 kHz）获得的Li-7-NMR结果可以监测Li +离子局部环境中的细微变化，以及它们在STOBA-阴极界面中的相互作用和迁移率，作为温度和充电状态。组合的表征结果使人们更了解STOBA层如何有助于锂离子电池的安全性。

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