分离器(采油)
膜
材料科学
收缩率
复合材料
多孔性
氧化物
阴极
原子层沉积
聚烯烃
化学工程
冶金
图层(电子)
化学
工程类
物理
物理化学
热力学
生物化学
作者
Leonardo Pires da Veiga,Colin Jeanguenat,Fabiana Lisco,Hengyu Li,Sylvain Nicolay,Christophe Ballif,Andrea Ingenito,Juan J. Díaz León
出处
期刊:ACS omega
[American Chemical Society]
日期:2022-11-30
卷期号:7 (49): 45582-45589
被引量:4
标识
DOI:10.1021/acsomega.2c06318
摘要
Thermal runaway is a major safety concern in the applications of Li-ion batteries, especially in the electric vehicle (EV) market. A key component to mitigate this risk is the separator membrane, a porous polymer film that prevents physical contact between the electrodes. Traditional polyolefin-based separators display significant thermal shrinkage (TS) above 100 °C, which increases the risk of battery failure; hence, suppressing the TS up to 180 °C is critical to enhancing the cell’s safety. In this article, we deposited thin-film coatings (less than 10 nm) of aluminum oxide by atomic layer deposition (ALD) on three different types of separator membranes. The deposition conditions and the plasma pretreatment were optimized to decrease the number of ALD cycles necessary to suppress TS without hindering the battery performance for all of the studied separators. A dependency on the separator composition and porosity was found. After 100 ALD cycles, the thermal shrinkage of a 15 μm thick polyethylene membrane with 50% porosity was measured to be below 1% at 180 °C, with ionic conductivity >1 mS/cm. Full battery cycling with NMC532 cathodes demonstrates no hindrance to the battery’s rate capability or the capacity retention rate compared to that of bare membranes during the first 100 cycles. These results display the potential of separators functionalized by ALD to enhance battery safety and improve battery performance without increasing the separator thickness and hence preserving excellent volumetric energy.
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