一种锂离子电池用隔膜及其制备方法

Separator for lithium ion battery and preparation method of separator

Abstract

一种锂离子电池用隔膜,属于锂离子电池技术领域,包括聚合物微孔膜基材,所述基材表面及微孔孔道内壁上覆有纳米氧化物层。其制备方法包括以下步骤:(1)将聚合物微孔膜用酸溶液进行氧化处理,再依次用碱溶液、去离子水清洗,烘干;(2)置于原子层沉积仪器或连续化原子层沉积装置上,抽真空并加热至50~100℃保持1~30min;(3)通入第一前驱体三甲基铝;(4)通入氮气或惰性气体进行清扫;(5)通入第二前躯体;(6)通入氮气或惰性气体进行清扫;(7)重复步骤(3)~(6);(8)进行热定型处理。本发明得到的隔膜厚度小,热收缩率小,与电解液的浸润性好,制备工艺温度低,形成涂层致密,可以精确控制涂层厚度。
The invention discloses a separator for a lithium ion battery and belongs to the technical field of lithium ion batteries. The separator comprises a polymer microporous film substrate, wherein the surface of the substrate and the internal wall of a micropore duct of the substrate are coated with nano-oxide layers. The preparation method comprises the following steps: (1) performing oxidation treatment on the polymer microporous film with an acid solution, then washing the film successively with an alkali solution and deionized water and drying the film; (2) putting the film on an atomic layer deposition apparatus or a continuous atomic layer deposition device, then vacuumizing, heating to 50-100 DEG C and keeping for 1-30min; (3) introducing trimethylaluminum as a first precursor; (4) adding nitrogen or inert gas for purging; (5) introducing a second precursor; (6) adding nitrogen or inert gas for purging; (7) repeating steps (3)-(6); and (8) performing heat setting treatment. The separator disclosed by the invention is small in thickness and heat shrinkage, and is good in wetting property with electrolyte. The preparation process temperature is low, a formed coating is dense, and the thickness of the coating can be precisely controlled.

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