Journal
POWDER TECHNOLOGY
Volume 297, Issue -, Pages 266-274Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.powtec.2016.04.011
Keywords
Lithium-ion battery cathodes; Carbon black; Dry mixing; Electrode manufacturing; Electrode structure; Process-property-relation
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Funding
- German Federal Ministry for Education and Research (BMBF) [03X4601C]
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Carbon black is an important component in lithium-ion battery electrodes since it significantly improves the electric conductivity in the coating. Dependent on the carbon black structure and the homogeneity of the carbon black distribution, electrical and electrochemical electrode properties vary. The presented work reveals that the carbon black structure in lithium-ion battery electrodes can precisely be governed by careful parameter variations in an upstream dry mixing process. Significant changes in important electrode properties like mechanical, structural and electrical characteristics are achieved and can be described as functions of the process parameters mixing time and mixing intensity. The integration of an intensive dry mixing process improves the coating homogeneity and creates short-range electrical contacts on the particle surfaces, leading to enhancements in cycling stability. Long-range electrical contacts can be re-established due to a subsequent calendering step, compensating rate capability losses, which can be identified for uncalendered electrodes. (C) 2016 Elsevier B.V. All rights reserved.
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