Hwang Yeongsu, Kim Minjae
Mechanical & Control Engineering, Handong Global University, Pohang 37554, Republic of Korea.
Polymers (Basel). 2024 Sep 17;16(18):2627. doi: 10.3390/polym16182627.
Lithium-ion batteries (LIBs) are well known for their energy efficiency and environmental benefits. However, increasing their energy density compromises their safety. This study introduces a novel ceramic-coated separator to enhance the performance and safety of LIBs. Electrospinning was used to apply a coating consisting of an alumina (AlO) ceramic and polyacrylic acid (PAA) binder to a polypropylene (PP) separator to significantly improve the mechanical properties of the PP separator and, ultimately, the electrochemical properties of the battery cell. Tests with 2032-coin cells showed that the efficiency of cells containing separators coated with 0.5 g PAA/AlO was approximately 10.2% higher at high current rates (C-rates) compared to cells with the bare PP separator. Open circuit voltage (OCV) tests revealed superior thermal safety, with bare PP separators maintaining stability for 453 s, whereas the cells equipped with PP separators coated with 4 g PAA/AlO remained stable for 937 s. The elongation increased from 88.3% (bare PP separator) to 129.1% (PP separator coated with 4 g PAA/AlO), and thermal shrinkage decreased from 58.2% to 34.9%. These findings suggest that ceramic/PAA-coated separators significantly contribute to enhancing the thermal safety and capacity retention of high-energy-density LIBs.
锂离子电池（LIBs）以其能源效率和环境效益而闻名。然而，提高其能量密度会损害其安全性。本研究引入了一种新型陶瓷涂层隔膜，以提高锂离子电池的性能和安全性。采用静电纺丝法将由氧化铝（AlO）陶瓷和聚丙烯酸（PAA）粘合剂组成的涂层涂覆在聚丙烯（PP）隔膜上，以显著改善PP隔膜的机械性能，并最终提高电池的电化学性能。对2032型硬币电池的测试表明，与使用裸PP隔膜的电池相比，含有涂覆0.5 g PAA/AlO隔膜的电池在高电流倍率（C倍率）下的效率高出约10.2%。开路电压（OCV）测试显示出卓越的热安全性，裸PP隔膜保持稳定453秒，而配备涂覆4 g PAA/AlO的PP隔膜的电池保持稳定937秒。伸长率从88.3%（裸PP隔膜）增加到129.1%（涂覆4 g PAA/AlO的PP隔膜），热收缩率从58.2%降至34.9%。这些发现表明，陶瓷/PAA涂层隔膜对提高高能量密度锂离子电池的热安全性和容量保持率有显著贡献。
