Scalable Dry Processing of Binder-Free Lithium-Ion Battery Electrodes Enabled by Holey Graphene
Scalable Dry Processing of Binder-Free Lithium-Ion Battery Electrodes Enabled by Holey Graphene
复制标题
DOI：
10.1021/acsaem.9b00066
复制
发表时间：
2019-05-01
影响因子：
6.4
通讯作者：
Hu, Liangbing
中科院分区：
文献类型：
--
作者：
Kirsch, Dylan J.;Lacey, Steven D.;Hu, Liangbing
为了解决伴随湿电极制造技术的众多问题，使用称为干压的可扩展且环保的干加工方法来制造仅由活性组分（活性电池材料和导电添加剂）组成的复合锂离子电池（LIB）电极。为了实现这一点，纳米多孔碳同素异形体（即，多孔石墨烯或hG）充当可压缩和导电的基质以容纳不可压缩的阴极和阳极电池粉末。固有的纳米孔隙率促进了压缩时捕获的气体的逸出，使得能够独立于所选择的活性电池粉末、制造压力或压制时间成功地形成无粘合剂和无溶剂的复合电极。用不同的工艺参数（例如，为了证明干压作为可行的LIB电极制造方法的潜力，使用模型阴极材料（磷酸铁锂，LFP）在结构上和电化学上评估了干压（例如，液压、压制时间）。
To address the multitude of issues that accompany wet electrode fabrication techniques, composite lithium-ion battery (LIB) electrodes composed of solely active components (active battery material and conductive additive) are fabricated using a scalable and eco-friendly dry processing method known as dry pressing. To accomplish this, a nanoporous carbon allotrope (i.e., holey graphene or hG) acts as the compressible and conductive matrix to accommodate incompressible cathode and anode battery powders. The inherent nanoporosity facilitates the escape of trapped gases upon compression, enabling the successful formation of binderless and solventless composite electrodes independent of selected active battery powder, fabrication pressure, or pressing time. Dry pressed LIB electrodes fabricated with different processing parameters (e.g., hydraulic pressure, pressing time) are evaluated structurally and electrochemically using a model cathode material (lithium iron phosphate, LFP) in order to demonstrate the potential of dry pressing as a viable LIB electrode manufacturing method.