Investigation on mechanical and microstructural evolution of lithium-ion battery electrode during the calendering process

Zhang, Junpeng; Huang, Huagui; Sun, Jian

doi:10.1016/j.powtec.2022.117828

Cited by 18 publications

(11 citation statements)

References 31 publications

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Section: Resultssupporting

confidence: 86%

“…Thus, it leaves unclear, if a decrease in the electrical conductivity appears in this range as it does for the effective thermal conductivity. A similar behavior with a monotonously increasing electrical conductivity with increased compression rate was found by Zhang et al [47] Additionally, it can be derived from Figure 2 that the effective thermal conductivity of the NMC622 stacks is between 25% and 60% higher than the effective thermal conductivity of the NMC811 stacks. However, regarding the data presented in this study, it cannot be concluded that the thermal conductivity of NMC622 (both active material particles and coated electrode stacks) is generally higher than the one of NMC811 as the electrodes have different compositions.…”

Section: Effective Thermal Conductivitysupporting

confidence: 85%

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Effective Thermal Conductivity of Lithium‐Ion Battery Electrodes in Dependence on the Degree of Calendering

et al. 2023

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The thermal conductivity represents a key parameter for the consideration of temperature control and thermal inhomogeneities in batteries. A high‐effective thermal conductivity will entail lower temperature gradients and thus a more homogeneous temperature distribution, which is considered beneficial for a longer lifetime of battery cells. Herein, the impact of the microstructure within the porous electrode coating obtained by different compression rates and its thermal contact to the current collector is investigated as both factors significantly determine the overall conduction through the electrode. The effective thermal conductivity of two graphite anodes and two lithium nickel manganese cobalt oxide cathodes is evaluated at different compression rates. It is found that the thermal conductivity does not have a monotone dependence on the porosity with changing compression rates. The results show a strong correlation with the adhesion strength, thus a significant impact of the thermal contact resistance between the coating and current collector is assumed.

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Section: Resultssupporting

confidence: 86%

Section: Effective Thermal Conductivitysupporting

confidence: 85%

Effective Thermal Conductivity of Lithium‐Ion Battery Electrodes in Dependence on the Degree of Calendering

et al. 2023

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“…Generally, the electrical conductivity could be improved through calendering by decreasing the porosity and increasing the tortuosity. [ 45 ] The relationship between electrical conductivity and tortuosity/porosity can be described by the MacMullin number ( N M ), as shown in Equation (3)

N_{normalM} = \frac{σ_{eff}}{σ_{0}} = \frac{τ}{ε}

where σ eff is the effective conductivity; σ 0 is the intrinsic conductivity; τ is the tortuosity; and ε is the porosity.…”

Section: Resultsmentioning

confidence: 99%

“…Generally, the electrical conductivity could be improved through calendering by decreasing the porosity and increasing the tortuosity. [45] The relationship between electrical conductivity and tortuosity/porosity can be described by the MacMullin number (N M ), as shown in Equation ( 3)…”

Section: Electrical Conductivity and Two-nested Percolation Systems F...mentioning

confidence: 99%

“…This is in agreement with several other studies that show that calendering affects electrical conductivity. [45] However, some literature demonstrated that calendering influences the electrical conductivity of the NMC cathodes very slightly. [46,47] To provide further clarity on this problem, we conducted additional experiments and subsequently presented a more comprehensive discussion in the following.…”

Section: Electrical Conductivity and Two-nested Percolation Systems F...mentioning

confidence: 99%

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Microstructure of Conductive Binder Domain for Electrical Conduction in Next‐Generation Lithium‐Ion Batteries

Lian

et al. 2023

Energy Tech

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The purpose of this work is to investigate the structure and mechanism of long‐range electronic contacts which are formed by wet mixing and their interaction and relationship with the structure responsible for ion‐transfer within the conductive binder domain of next‐generation LiNi0.6Mn0.2Co0.2O2 lithium‐ion batteries. This paper introduces a novel concept involving an efficient adapted structure model, which includes a bridge structure with two “nested” small and large pore systems, and an effective electrode conduction mechanism involving two “nested” percolation systems. The paper also highlights a limitation in the improvement of the battery performance by percolation systems for electron transfer, which is restricted by pore systems for ion transfer through the ratio of electrical conductivity (σ) and ionic conductivity (κ) as σ/κ = 10. The findings of this paper may provide valuable insight for formulation design and manufacturing of an optimal structure of the conductive binder domain for next‐generation lithium‐ion batteries.This article is protected by copyright. All rights reserved.

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Hierarchical Yolk‐Shell Silicon/Carbon Anode Materials Enhanced by Vertical Graphene Sheets for Commercial Lithium‐Ion Battery Applications

Yu,

Li,

Zhang

et al. 2024

Adv Funct Materials

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Yolk‐shell structured silicon/carbon (YS‐Si/C) anode materials show promise for commercial lithium‐ion batteries (LIBs) because of their high specific capacity and excellent cycling life. However, their commercialization has not been realized despite nearly a decade of research, primarily due to poor mechanical strength, limited rate capability, and low energy density. This study reports a hierarchical YS‐Si/C anode material synthesized via thermal chemical vapor deposition for the growth of vertical graphene sheets (VGSs), polymer self‐assembly, and one‐step carbonization, which establishes connections between the Si core and carbon shell through VGSs, enhancing the electrochemical and mechanical characteristics of the YS‐Si/C material. The unique material outperforms VGSs‐free composites, which presents a high specific capacity of 1683.2 mAh g−1 at 0.1 C, excellent rate performance of 552.2 mAh g−1 at 10 C, and superior capacity retention of 80.1% after 1000 cycles. When matched with LiNi0.8Co0.1Mn0.1O2 cathodes, the ampere‐hour‐level pouch cell delivers high gravimetric and volumetric energy densities of 429.2 Wh kg−1 and 1083 Wh L−1, respectively. Finite element analysis shows that VGSs reduce stress concentration on the carbon shell, helping hollow materials withstand industrial electrode calendaring. This work demonstrates potential for the commercial application of YS‐Si/C anode materials in practical LIBs.

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Investigation on mechanical and microstructural evolution of lithium-ion battery electrode during the calendering process

Cited by 18 publications

References 31 publications

Effective Thermal Conductivity of Lithium‐Ion Battery Electrodes in Dependence on the Degree of Calendering

Effective Thermal Conductivity of Lithium‐Ion Battery Electrodes in Dependence on the Degree of Calendering

Microstructure of Conductive Binder Domain for Electrical Conduction in Next‐Generation Lithium‐Ion Batteries

Hierarchical Yolk‐Shell Silicon/Carbon Anode Materials Enhanced by Vertical Graphene Sheets for Commercial Lithium‐Ion Battery Applications

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