高粘度相位逆转分离器用于离子电池的独立和直接对电极制造
Michelle E R Katz1, Corie L Cobb1
1Department of Mechanical Engineering, University of Washington, Seattle, Washington 98195, United States.
ACS applied materials & interfaces
|August 13, 2024
概括
一种用于离子电池 (LIB) 的新型聚合物复合物分离剂泥可以直接对电极进行制造,提高制造效率和电池性能. 这种新的分离材料在容量和稳定性方面优于商业选择.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 目前的离子电池 (LIB) 制造依赖于分离器 (聚烯/聚乙烯) 的单独加工步骤,阻碍了与电极制造的整合.
- 商业分离器缺乏先进电池设计所需的灵活性,例如微型电池和具有定制形式因子的灵活电池.
- 现有的分离器在适应新型,精简的制造工艺方面存在局限性.
研究的目的:
- 开发一种高粘度聚合物复合物分离泥,用于集成的LIB制造.
- 为了使独立的和直接对电极的分离膜能够生产.
- 为了研究材料组成和风学对分离器性能和相位逆转处理的影响.
主要方法:
- 开发了一种基于聚乙烯化物-co-hexafluoropropylene (PVDF-HFP) 的泥,使用二乙烯糖醇 (DEG) 或三乙烯酸盐 (TEP) 作为非溶剂和 (SiO2) 或 (Al2O3) 作为无机添加剂.
- 采用精简的相位逆转工艺来创建多孔的分离膜.
- 评估了四种不同的配方,将其降级为TEP-SiO2配方,用于在LiFePO4干Li4Ti5O12 (LFP干LTO) 和LiNi0.5Mn0.3Co0.2O2干石墨 (NMC-532干石墨) 硬币细胞中进行进一步测试.
主要成果:
- 在速率和周期寿命测试中,TEP-SiO2分离器配方的性能与商业Celgard 2325和Beyond Battery陶涂层PE分离器具有相似或优越的性能.
- TEP-SiO2泥的粘度为298Pa·s,在1s-1的剪切速率下,剪切变薄的行为.
- 与商业分离器相比,直接对电极TEP-SiO2分离器显著增加了特定容量 (58%和2°C时304%);独立分离器显示出出色的热稳定性 (200°C1小时) 和增强的机械性能 (弹性模量,硬度).
结论:
- 开发的TEP-SiO2聚合物复合物分离泥使LIBs的高效,综合制造成为可能.
- 与传统分离器相比,这种新型分离器材料提供了增强的电化学性能,尺寸稳定性和机械性能.
- 这些发现为先进的LIB制造工艺铺平了道路,包括槽模涂层和定制的电池形状因素.
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