CAJ | 학술논문

将混有氧化铝( Al2 O3)颗粒的有机溶剂浆料均匀涂覆在常规PE隔膜单侧,制成Al2 O3陶瓷涂层复合锂离子电池用隔膜.通过扫描电镜( SEM)、热重分析仪( TGA)、万能材料拉伸试验机、电化学工作站和采用该复合隔膜组装成LiFePO4- C体系电池进行充放电循环及热箱测试,对Al2 O3陶瓷涂层复合隔膜的微观形貌、力学性能及电化学性能进行研究.结果表明：Al2 O3陶瓷涂层复合隔膜能有效提高隔膜的抗拉延伸率、提高隔膜对电解液的吸附性,降低隔膜的界面阻抗；采用此种复合隔膜组装的锂离子电池在55℃下进行0.5 C充放电循环200,容量保持率在95%以上；在150℃热箱测试中具有较高的热稳定性能.
장혼유양화려( Al2 O3)과립적유궤용제장료균균도복재상규PE격막단측,제성Al2 O3도자도층복합리리자전지용격막.통과소묘전경( SEM)、열중분석의( TGA)、만능재료랍신시험궤、전화학공작참화채용해복합격막조장성LiFePO4- C체계전지진행충방전순배급열상측시,대Al2 O3도자도층복합격막적미관형모、역학성능급전화학성능진행연구.결과표명：Al2 O3도자도층복합격막능유효제고격막적항랍연신솔、제고격막대전해액적흡부성,강저격막적계면조항；채용차충복합격막조장적리리자전지재55℃하진행0.5 C충방전순배200,용량보지솔재95%이상；재150℃열상측시중구유교고적열은정성능.
An Al2 O3 ceramic coated composite separator used for lithium-ion battery was prepared by coating single side of the porous polyethylene ( PE ) separator with organic slurries which were mixed with aluminum oxide ( Al2 O3 ) power. The morphologies, mechanical and electrochemical properties of the Al2 O3 coated composite separator were researched through the scanning electron microscopic ( SEM ) , thermo gravimetric analysis ( TGA ) , universal tensile machine and electrochemical workstation test, moreover the charge-discharge and hot oven test were carried in lithium-ion cells which were assembled by using the coated composite separator with LiFePO4 cathode and graphite anode. The results showed that the Al2 O3 coated composite separator could effectively improve the tensile strength and the electrolyte uptake were also improved so that the interfacial resistance was reduced. The battery assembled with the separator showed good cycling performance and the capacity retention kept above 95% which charge-discharges at 0 . 5 C in 55 ℃, and the battery also hept good thermal stability baking at 150 ℃ in oven testing.