Agitation Effect on the Rheological Behavior of Lithium-Ion Battery Slurries

Kwon, Younggoo; Kim, Jong Dae; Song, Young Seok

doi:10.1007/s11664-014-3349-1

Cited by 35 publications

(15 citation statements)

References 26 publications

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“…Despite the widespread use of PVDF and its importance in the cathode, our understanding of the role of PVDF in microstructure and rheological property of cathode slurry is still lacking. Song and coworkers [ 26 , 27 , 28 ] described the PVDF as a typical adsorbing polymer in cathode slurry that plays a role in controlling dispersion quality and corresponding rheological properties. They argued that high molecular weight PVDF forms a gel structure by bridging flocculation; thus, the floc structure of the particles is affected by interaction of the particle and the polymeric binders.…”

Section: Introductionmentioning

confidence: 99%

Role of PVDF in Rheology and Microstructure of NCM Cathode Slurries for Lithium-Ion Battery

et al. 2020

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A binder plays a critical role in dispersion of coating liquids and the quality of coating. Poly(vinylidene fluoride) (PVDF) is widely used as a binder in cathode slurries; however, its role as a binder is still under debate. In this paper, we study the role of PVDF on the rheology of cathode battery slurries consisting of Li(Ni1/3Mn1/3Co1/3)O2 (NCM), carbon black (CB) and N-methyl-2-pyrrolidone (NMP). Rheology and microstructure of cathode slurries are systemically investigated with three model suspensions: CB/PVDF/NMP, NCM/PVDF/NMP and NCM/CB/PVDF/NMP. To highlight the role of PVDF in cathode slurries, we prepare the same model suspensions by replacing PVDF with PVP, and we compare the role of PVDF to PVP in the suspension rheology. We find that PVDF adsorbs neither onto NCM nor CB surface, which can be attributed to its poor affinity to NCM and CB. Rheological measurements suggest that PVDF mainly increases matrix viscosity in the suspension without affecting the microstructure formed by CB and NCM particles. In contrast to PVDF, PVP stabilizes the structure of CB and NCM in the model suspensions, as it is adsorbed on the CB surface. This study will provide a useful insight to fundamentally understand the rheology of cathode slurries.

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Section: Introductionmentioning

confidence: 99%

Role of PVDF in Rheology and Microstructure of NCM Cathode Slurries for Lithium-Ion Battery

et al. 2020

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“…The resistance of electrical double layer (EDL) R dl is initially increased and then decreased as the weight ratio of LiCoO 2 particles is increased. This phenomenon can be explained by the LiCoO 2 -PVDF ratio effect which is that a network is well formed by con-0.0 5.0x10 5 1.0x10 6 1.5x10 6 2.0x10 6 2.5x10 6 (a)…”

Section: Discussionmentioning

confidence: 99%

“…Cho K Y et al 5 points out the relation between the internal structure configuration which is referred to the network structure of active particles and the electrical pathways of the conductive additive and the physical properties which are thixotropic, storage modulus and loss modulus of LIB slurry by using the microscopic morphology and rheological rheometer measurements methods. Moreover, Kwon Y I et al 6 verified the rheological rheometer measurement results of LIB slurry by using the microscopic morphology measurement method. They concluded that the network of active material was broken-down with increasing of time and agitation.…”

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confidence: 91%

Evaluation of the Electrochemical Characterizations of Lithium-Ion Battery (LIB) Slurry with 10-Parameter Electrical Equivalent Circuit (EEC)

Wang

Zhao

Yao

et al. 2016

J. Electrochem. Soc.

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A 10-parameter Electrical Equivalent Circuit (10-parameter EEC) has been proposed to evaluate the electrochemical characterizations which are resistance, reactance and relaxation frequency of Lithium-ion battery (LIB) slurry under different components weight ratio of three samples composed of PVDF-NMP solution, Carbon Black (CB) absent slurry and CB present slurry. The 10-parameter EEC is constructed by combining the internal structure of LIB slurry and the electrochemical responses of three samples. Four conclusions are clarified by fitting Electrochemical Impedance Spectroscopy (EIS) Nyquist and Bode plots with the 10-parameter EEC. Firstly, the standard deviation S of the 10-parameter EEC = 14.3% is lower than that of a conventional 8-parameter EEC = 30.6% by S = 16.3%. Secondly, the resistance of electric double layer (EDL) R dl is firstly increased and then decreased as LiCoO 2 particles weight ratio wt LiCoO 2 is increased, which is well explained by LiCoO 2-PVDF ratio effect. Thirdly, the resistances of PVDF-NMP solution R SO and conductive path R p are the resistances of LiCoO 2-NMP interface dispersion and PVDF-NMP solution dispersion in LIB slurry. Lastly, relaxation frequencies of LiCoO 2-NMP interface dispersion f relax,high and PVDF-NMP solution dispersion f relax,low obtained from EIS experiment can be represented by those of f relax1 and f relax2 calculated from the 10-parameter EEC.

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“…Several research groups have evaluated the rheological properties of SA [ 11 , 14 , 15 ], some with respect to its spinnability [ 9 , 13 , 16 ]. Rheological characteristics of LIB slurries can be found more frequently [ 17 , 18 , 19 , 20 ], but none of them deals with SA in combination with lithium titanium oxide (LTO) as anode material. Both Garcia et al [ 21 ] and Cuesta et al [ 22 ] studied alginate suspensions as binders for LIBs but used graphite as electrode material.…”

Section: Introductionmentioning
confidence: 99%

Rheological Properties of Aqueous Sodium Alginate Slurries for LTO Battery Electrodes
Toigo
¹
,
Kráčalík
²
,
Bradt
³

et al. 2021
Polymers
9
0
5
0
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Rheological properties of electrode slurries have been intensively studied for manifold different combinations of active materials and binders. Standardly, solvent-based systems are under use, but a trend towards water-based electrode manufacturing is becoming more and more important. The different solvent is beneficial in terms of sustainability and process safety but is also accompanied by some disadvantages such as extraction of residual humidity and a higher complexity concerning slurry stability. Li4Ti5O12 (LTO) active material provides good long-term stability and can be processed in aqueous solutions. Combining the LTO active material with sodium alginate (SA) as a promising biobased polymer binder reveals good electrochemical properties but suffers from bad slurry stability. In this work, we present a comprehensive rheological study on material interactions in anode slurries consisting of LTO and SA, based on a complex interaction of differentially sized materials. The use of two different surfactants—namely, an anionic and non-ionic one, to enhance slurry stability, compared with surfactant-free slurry.

~~show abstract~~

Agitation Effect on the Rheological Behavior of Lithium-Ion Battery Slurries

Cited by 35 publications

References 26 publications

Role of PVDF in Rheology and Microstructure of NCM Cathode Slurries for Lithium-Ion Battery

Role of PVDF in Rheology and Microstructure of NCM Cathode Slurries for Lithium-Ion Battery

Evaluation of the Electrochemical Characterizations of Lithium-Ion Battery (LIB) Slurry with 10-Parameter Electrical Equivalent Circuit (EEC)

Rheological Properties of Aqueous Sodium Alginate Slurries for LTO Battery Electrodes

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