Thermally stable poly-aromatic solid electrolyte coated polyethylene membrane as high-performance lithium-ion battery separator
作者：Hui Ding , Jiao Ge , Tangxin Zhang , Chenbing He , Hao Zhang , Badusha Mohamad Ali , Jianli Wang
關鍵字：Lithium-ion battery, Wettability, Polyethylene separator, Sulfonated aromatic polymer, Coating modification, Thermal stability
論文來源：期刊
具體來源：Journal of Power Sources
發表時間：2024年
提高聚烯烴分離器的尺寸穩定性和電解質潤濕性對提高動力鋰離子電池的安全性和性能至關重要。在本研究中，通過在商用聚乙烯(PE)隔膜表面涂覆聚芳族固體電解質(磺化聚芳醚酮)(SPAEK)，制備了顯著提高熱穩定性和溶劑潤濕性的復合隔膜。有趣的是，磺化度為60%的SPAEK形成的涂層由于極性磺酸基導致相分離過程延遲，呈現出豐富的多孔結構。所述多電解質涂層使復合分離器具有超電解質親和力和較高的電解質吸收量。此外，復合隔膜具有更好的綜合性能，包括熱穩定性和離子電導率。結果表明，spaek涂層復合隔膜組件的LiNi0.83Co0.11Mn0.06O2(NCM811)/Li 電池在2 C下的容量保持率為84.01%，循環200次后的比容量為151.25 mAh g-1。因此，這種改良的隔膜是一種潛在的材料，可以促進鋰離子電池的高性能和安全性。
Improving the dimensional stability and electrolyte wettability of polyolefin separators is crucial to enhancing the safety and performance of power lithium-ion batteries (LIBs). In this work, composited separators that significantly improve both thermal stability and solvent wettability are prepared by coating polyaromatic solid electrolyte (sulfonated poly(aryl ether ketone), SPAEK) onto the surface of commercial polyethylene (PE) separators. Interestingly, the coating layer formed by SPAEK with a 60% sulfonation degree exhibits abundant porous structure owing to the polar sulfonic group inducing a retarded phase separation process. The polyelectrolyte coating layer enables both super-electrolyte affinity and higher electrolyte uptake of the composite separator. Moreover, the composited separator presents much better comprehensive properties, including thermal stability and ionic conductivity. As a result, the SPAEK-coated composite separator assembles LiNi0.83Co0.11Mn0.06O2 (NCM811)/Li battery exhibits a higher capacity retention rate of 84.01% at 2 C with a specific capacity of 151.25 mAh g-1 after 200 cycles. Hence, this modified separator is a potential material that facilitates high performance and safety for Li-ion batteries.
該工作由國家自然科學基金項目(22178317、22109138)資助。
https://doi.org/10.1016/j.jpowsour.2024.234355