Microstructure formation of lithium-ion battery electrodes during drying An - ex-situ study using cryogenic broad ion beam slope cutting and scanning electron microscopy (Cryo-BIB-SEM)

被引:122
作者
Jaiser, Stefan [1 ]
Kumberg, Jana [1 ]
Klaver, Jop [2 ]
Urai, Janos L. [3 ]
Schabel, Wilhelm [1 ]
Schmatz, Joyce [2 ]
Scharfer, Philip [1 ]
机构
[1] Karlsruhe Inst Technol, Inst Thermal Proc Engn, Thin Film Technol, Kaiserstraige 12, D-76131 Karlsruhe, Germany
[2] MaP Microstruct & Pores GmbH, Lochnerstrasse 4-20, D-52064 Aachen, Germany
[3] Rhein Westfal TH Aachen, Struct Geol Tecton & Geomechan, Lochnerstrafge 4-20, D-52064 Aachen, Germany
关键词
Cryo-BIB-SEM; Drying; Film formation; Binder migration; Energy-dispersive X-ray spectroscopy; Lithium-ion battery; ELECTROCHEMICAL PERFORMANCE; COLLOIDAL DISPERSIONS; SOLVENT EVAPORATION; LATEX; BINDER; MIGRATION; PARTICLES; IMPACT; COST;
D O I
10.1016/j.jpowsour.2017.01.117
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Properties of lithium-ion battery electrodes relate to the complex microstructure that develops during solvent removal. We use cryogenic scanning electron microscopy in combination with broad ion beam slope-cutting (Cryo-BIB-SEM) for the ex-situ imaging of film formation in battery electrodes. Drying of anode films is quenched by cryo-preservation in slushy nitrogen at systematically increasing drying times, followed by SEM imaging under cryogenic conditions. Energy dispersive x-ray spectroscopy (EDS) and image processing of segmented cross-sections are used to analyze the development of component gradients with time. We find electrode films to shrink homogeneously and not in a top-down consolidation process as previously hypothesized. Binder gradients evolve in the liquid phase and initiate solvent diffusion from the bulk to the surface, thereby dragging binder towards the surface. Capillary transport is identified as a fundamental process that directly impacts drying kinetics and binder distribution. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:97 / 107
页数:11
相关论文
共 65 条
[1]  
a Nelson P., 2012, Modeling the Performance and Cost of Lithium-Ion Batteries for Electric-Drive Vehicles Chemical Sciences and Engineering Division
[2]   Energy impact of cathode drying and solvent recovery during lithium-ion battery manufacturing [J].
Ahmed, Shabbir ;
Nelson, Paul A. ;
Gallagher, Kevin G. ;
Dees, Dennis W. .
JOURNAL OF POWER SOURCES, 2016, 322 :169-178
[3]  
[Anonymous], 2009, POWERTRAIN 2020 FUTU
[4]   Autostratification in Drying Colloidal Dispersions: Effect of Particle Interactions [J].
Atmuri, Anand K. ;
Bhatia, Surita R. ;
Routh, Alexander F. .
LANGMUIR, 2012, 28 (05) :2652-2658
[5]  
Barnett B., 2011, PHEV and LEESS Battery Cost Assessment
[6]   Delamination behavior of lithium-ion battery anodes: Influence of drying temperature during electrode processing [J].
Baunach, M. ;
Jaiser, S. ;
Schmelzle, S. ;
Nirschl, H. ;
Scharfer, P. ;
Schabel, W. .
DRYING TECHNOLOGY, 2016, 34 (04) :462-473
[7]  
Bernhard W., 2012, POWERTRAIN 2020 LI I
[8]   The interaction of consecutive process steps in the manufacturing of lithium-ion battery electrodes with regard to structural and electrochemical properties [J].
Bockholt, Henrike ;
Indrikova, Maira ;
Netz, Andreas ;
Golks, Frederik ;
Kwade, Arno .
JOURNAL OF POWER SOURCES, 2016, 325 :140-151
[9]   Intensive powder mixing for dry dispersing of carbon black and its relevance for lithium-ion battery cathodes [J].
Bockholt, Henrike ;
Haselrieder, Wolfgang ;
Kwade, Arno .
POWDER TECHNOLOGY, 2016, 297 :266-274