Delamination behavior of lithium-ion battery anodes: Influence of drying temperature during electrode processing
Delamination behavior of lithium-ion battery anodes: Influence of drying temperature during electrode processing
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DOI：
10.1080/07373937.2015.1060497
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发表时间：
2016-01-01
影响因子：
3.3
通讯作者：
Schabel, W.
中科院分区：
文献类型：
--
作者：
Baunach, M.;Jaiser, S.;Schabel, W.
在锂离子电池的电极加工过程中，一个重要的工艺步骤是干燥湿颗粒电极涂层。电极膜在溶剂蒸发期间固化，并且形成多孔膜。在本研究中，我们专注于干燥温度对干膜内部电极结构的影响。涂覆由石墨和水性粘合剂体系组成的阳极浆料并随后干燥。为了确保限定的和可控的干燥条件，使用具有温度控制的基底载体和冲击干燥器的实验室装置。为了便于放大到连续通过的干燥器，实验温度的选择是基于稳态温度的计算，该稳态温度是由工业干燥过程中常用的气体温度产生的。通过90度剥离试验研究不同干燥的电极的分层行为。结果表明，干燥温度对电极附着力有很强的依赖性。在较高温度下较低的粘附力暗示在铜基底和涂层之间的界面处的粘合剂含量的变化。在干燥过程中的空气膜界面处的固结层的形成被确定为一个可能的解释和固结层形成的标准建议。
One essential process step during electrode processing for lithium-ion batteries is the drying of the wet particulate electrode coating. The electrode film solidifies during evaporation of the solvent and a porous film is formed. In this study, we focus on the influence of drying temperature on the internal electrode structure of the dry film. Anode slurries that consist of graphite and an aqueous binder system were coated and subsequently dried. To assure defined and controllable drying conditions, a laboratory set-up with a temperature-controlled substrate carrier and an impingement dryer was used. To facilitate a scale-up to continuously passed dryers, the choice of experimental temperatures was based on a calculation of steady-state temperatures that result from gas temperatures that are commonly applied in industrial drying processes. The delamination behavior of the differently dried electrodes was investigated by means of a 90 degrees peel test. The results show a strong dependency of electrode adhesion on drying temperature. A lower adhesion force at higher temperatures hints at a variation in binder content at the interface between the copper substrate and the coating layer. The formation of a consolidation layer at the air-film interface during drying is identified as a possible explanation and a criterion for consolidation layer formation is suggested.