亚微米级α相氧化铝粉体在锂离子电池PE隔膜涂层中的应用

罗金华; 赵能

doi:10.7513/j.issn.1004-7638.2021.05.012

亚微米级α相氧化铝粉体在锂离子电池PE隔膜涂层中的应用

doi: 10.7513/j.issn.1004-7638.2021.05.012

罗金华,
赵能

攀枝花学院钒钛学院, 四川攀枝花 617000

基金项目: 四川省科技厅重点研发项目（2020YFG0216）。

详细信息

作者简介:
罗金华（1981—），男，湖南郴州人，博士，讲师，长期从事纳米新材料方面的研究工作，E-mail:ljhazq020312@163.com。

中图分类号: TF124,TM912.9
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出版历程
- 收稿日期: 2021-08-13
- 刊出日期: 2021-10-30

Application of sub-micron α phase alumina powder in PE membrane coating of lithium ion battery

College of Vanadium and Titanium, Panzhihua University, Panzhihua 617000, Sichuan, China

摘要

摘要: 对D₅₀=1.08 μm的α-氧化铝粉体原料，通过物理法机械球磨制备亚微米级α-氧化铝粉体，然后将其应用在锂离子电池隔膜涂覆改性方面。将亚微米级α-氧化铝粉体应用于锂离子电池PE隔膜涂层，对比了涂覆前后PE隔膜性能的改变。结果表明：涂层致密平整，氧化铝颗粒均匀分布在PE隔膜表面，膜厚2.5 μm，涂覆后面密度增加了4.0 g/m²，透气度增加0.482 s/mL，纵向和横向的热收缩率分别降低了1.3%和0.3%，拉伸强度分别提升了26.4 MPa和3 MPa。
- α-相氧化铝粉 /
- 锂离子电池 /
- PE隔膜涂层 /
- 透气性 /
- 强度
Abstract: In this paper, sub-micron α-alμmina powders were prepared by physical mechanical milling of α-alumina powder with D₅₀ = 1.08 μm, and then applied to lithium-ion battery separator coating modification. The sub-micron α-alumina powder was applied to the PE membrane coating of lithium-ion battery. The results show that the coating is compact and flat, and the alumina particles are evenly distributed on the surface of PE film. The thickness of the film is 2.5 μm. After the coating, the density increases by 4.0 g/m², the air permeability increases by 48.2 s, the thermal shrinkage decreases by 1.3% and 0.3%, and the tensile strength increases by 26.4 MPa and 3 MPa, respectively.
- α-alumina powder /
- lithium-ion battery /
- PE film coating /
- air permeability /
- tensile strength

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图 1 不同粒径α-氧化铝粉体的XRD谱

Figure 1. XRD patterns of α-alumina powders with different particle sizes

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图 2 不同粒径α-氧化铝粉体的SEM形貌

Figure 2. SEM images of α -alumina powders with different particle sizes

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图 3 D₅₀=0.42 μm氧化铝粉体的DSC-TG曲线

Figure 3. DSC-TG curve of alumina powder D₅₀=0.42 μm

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图 4 涂覆亚微米级α-氧化铝前后PE隔膜的SEM形貌

Figure 4. SEM image of PE membrane coated with sub-micron α-alumina

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表 1 涂覆亚微米级α-氧化铝前后PE隔膜的基本性状

Table 1. Basic properties of PE membrane coated with sub-micron α-alumina

状态	厚度/μm	面密度/(g·m⁻²)	透气度/(s·mL⁻¹)	孔隙率/%
涂覆前	6.2	5.2	1.75	40
涂覆后	8.7	9.2	2.232	38.1
注：厚度检测方法按照GB/T 6672—2001进行；透气度检测方法按照GB/T 458—2008进行；面密度和孔隙率采用重量法检测。

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表 2 涂覆亚微米级α-氧化铝前后PE隔膜的热收缩率对比

Table 2. Comparison of the thermal shrinkage of PE membrane before and after submicron α-alumina coating

状态	热收缩率/%
状态	纵向MD	横向TD
涂覆前	3.2	0.6
涂覆后	1.9	0.3

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表 3 涂覆亚微米级α-氧化铝前后PE隔膜的拉伸强度对比

Table 3. Comparison of the tensile strength of PE membrane before and after submicron α-alumina coating

状态	拉伸强度/MPa
状态	纵向MD	横向TD
涂覆前	157	106
涂覆后	183.4	109

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