摘要
为了改善锂电隔膜的亲液性和耐热性,本研究采用聚苯醚树脂为成膜材料,利用相转化法制备了微孔锂电隔膜,通过膜形貌和结构表征、亲液性和耐热性测试对聚苯醚隔膜的基本性能进行研究,并将该隔膜装配成锂电池进行电化学性能表征。结果表明,聚苯醚隔膜显示出发达的三维孔道结构,孔隙率达到68%,约为传统聚烯烃膜的1.5倍;材料的良好亲液性和高孔隙率结构改善了聚苯醚隔膜的吸液性,其吸液率达到325%;该隔膜在160℃、60min的热处理条件下未发生明显的热收缩。相对于市售聚乙烯隔膜,聚苯醚微孔隔膜所装配锂离子电池显示出更优的循环性能和倍率性能。
To enhance the electrolyte wettability and thermal resistance of separator for lithium-ion battery,polyphenylene oxide（ PPO） resin was used to fabricate microporous separator by phase inversion method and investigated in lithium-ion batteries.Systematical investigations including morphology characterization,microstructure,contact angle testing,electrolyte wettability,thermal resistance testing and electrochemistry performance were carried out. The results demonstrated that PPO-based separator showed three-dimensional microporous structure with the porosity up to 68%,which was 1. 5 times higher than that of the conventional polyolefin separator. Based on the electrolyte wettable surface and well-defined microstructure,this separator exhibited superior electrolyte uptake of 325%. This separator displayed almost no thermal shrinkage at 160℃ for 60 min. Owing to the above advantages,PPO-based separator showed better electrochemical performances,such as the discharge C-rate capability and cycling performance.
出处
《化工新型材料》
CAS
CSCD
北大核心
2017年第7期114-116,119,共4页
New Chemical Materials
基金
国家自然科学基金(21376035)
关键词
隔膜
相转化法
聚苯醚
亲液性
耐热性
电化学性能
separator
phase inversion method
polyphenylene oxide
wettability
thermal resistance
electrochemistry performance
