Understanding Interfacial‐Energy‐Driven Dry Powder Mixing for Solvent‐Free Additive Manufacturing of Li‐Ion Battery Electrodes
Understanding Interfacial‐Energy‐Driven Dry Powder Mixing for Solvent‐Free Additive Manufacturing of Li‐Ion Battery Electrodes
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DOI：
10.1002/admi.201700570
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发表时间：
2017-09
影响因子：
5.4
通讯作者：
B. Ludwig;Jin Liu;I-Meng Chen;Yangtao Liu;Wan Shou;Yan Wang;H. Pan
中科院分区：
文献类型：
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作者：
B. Ludwig;Jin Liu;I-Meng Chen;Yangtao Liu;Wan Shou;Yan Wang;H. Pan
锂离子电池电极采用基于干粉的新型增材制造工艺制造。通过使用基于干粉的加工，可以去除传统电池工艺中的溶剂及其相关干燥过程，从而使大规模锂离子电池生产在汽车储能系统等市场中更具经济可行性。添加剂材料在整个活性材料中的均匀混合分布是制造基于干粉的锂离子电池的驱动因素。因此，本文的重点是开发一个物理模型的基础上的界面能，了解干混颗粒材料的混合特性。混合研究表明，由于均匀分布的颗粒，可以使用低至1重量%的粘合剂和导电添加剂材料的干法加工来制造功能电极。具有减少的导电和粘合剂添加剂的干法制造的电极的电化学性能是有希望的，因为电池在100次循环后保持77%的容量。虽然不代表锂离子电池的最佳可能电化学性能，但用LiCoO2作为活性材料的还原导电和粘合剂添加剂电极所实现的电化学性能证实了添加剂颗粒在整个电极基质中的良好分布性质。
Lithium‐ion battery electrodes are manufactured using a new additive manufacturing process based on dry powders. By using dry powder‐based processing, the solvent and its associated drying processes in conventional battery process can be removed, allowing for large‐scale Li‐ion battery production to be more economically viable in markets such as automotive energy storage systems. Uniform mixing distribution of the additive materials throughout the active material is the driving factor for manufacturing dry powder‐based Li‐ion batteries. Therefore, this article focuses on developing a physical model based on interfacial energies to understand the mixing characteristics of the dry mixed particulate materials. The mixing studies show that functional electrodes can be manufactured using dry processing with binder and conductive additive materials as low as 1 wt% due to the uniformly distributed particles. Electrochemical performance of the dry manufactured electrodes with reduced conductive and binder additive is promising as the cells retained 77% capacity after 100 cycles. While not representative of the best possible electrochemical performance of Li‐ion batteries, the achieved electrochemical performance of the reduced conductive and binder additive electrodes with LiCoO2 as the active material confirms the well distributed nature of the additive particles throughout the electrode matrix.