聚丙烯腈
材料科学
热重分析
热失控
电解质
循环伏安法
锂(药物)
锂离子电池
石墨
电池(电)
化学工程
电极
锂电池
电化学
复合材料
聚合物
离子
化学
有机化学
医学
功率(物理)
物理
量子力学
物理化学
离子键合
工程类
内分泌学
作者
Jonathan Allen,Marcin Mierzwa,Denis Kramer,Nuria Garcı́a-Aráez,Andrew L. Hector
出处
期刊:Batteries
[MDPI AG]
日期:2023-05-21
卷期号:9 (5): 282-282
标识
DOI:10.3390/batteries9050282
摘要
The electrodeposition of a polymer (polyacrylonitrile, PAN) is used to reduce the risk of thermal runaway in lithium-ion batteries, which is the most important cause of battery accidents and fires. PAN was electrodeposited on a graphite battery electrode, using cyclic voltammetry or chronoamperometry, in a solution with acrylonitrile as the solvent. The electrodeposited PAN film was characterised by Raman spectroscopy, microscopy, energy dispersive X-ray analysis, and thermogravimetric analysis, and it was found that the film thickness could be controlled by the amount of charge passed in the electrochemical experiments. The PAN-coated graphite battery electrode was then tested in lithium half-cells, obtaining capacities close to the uncoated graphite sample (ca. 360 mA h g−1) for thin (<10 µm) polymer coatings at 25 °C. Interestingly, for thicker polymer coatings (>20 µm) it was found that the capacity decreased drastically as the temperature increased beyond 80 °C. Such suppression in capacity has applications for thermal runaway protection since the electrochemical reactions of degradation of the electrolyte in contact with the electrode are the root cause of the thermal runaway process. Further work should look into alternative polymer and liquid electrolyte formulations to achieve the desired suppression of electrochemical capacity at high temperatures while retaining high capacities at the operational temperature range.
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