Understanding thickness and porosity effects on the electrochemical performance of LiNi0.6Co0.2Mn0.2O2-based cathodes for high energy Li-ion batteries

Heubner, Christian; Nickol, A.; Seeba, J.; Reuber, Sebastian; Junker, N.; Wolter, Mareike; Schneider, Michael; Michaelis, Alexander

doi:10.1016/j.jpowsour.2019.02.060

Cited by 151 publications

(161 citation statements)

References 40 publications

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“…Therefore, as expected low loaded electrodes provide higher rate performance than their higher loaded counterparts. A similar conclusion was substantially drawn by Gallagher et al who combined experimental and simulation approaches and Heubner et al on thick NCM electrodes (Gallagher et al, 2016;Heubner et al, 2019). In consequence, the ionic diffusion processes at stake in a battery system must be fully characterized as it governs the battery voltage divergence before the full recovery of the capacity because the Li-ion concentration reaches a null concentration at the cathode.…”

Section: Introductionsupporting

confidence: 63%

Effect of Electrode and Electrolyte Thicknesses on All-Solid-State Battery Performance Analyzed With the Sand Equation

et al. 2020

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The energy conversion and storage are great challenges for our society. Despite the progress accomplished by the Lithium(Li)-ion technology based on flammable liquid electrolyte, their intrinsic instability is the strong safety issue for large scale applications. The use of solid polymer electrolytes (SPEs) is an adequate solution in terms of safety and energy density. To increase the energy density (resp. specific energy) of the batteries, the positive electrode thickness must be augmented. However, as for Li-ion liquid electrolyte, the cationic transference number of SPEs is low, typically below 0.2, which limits their power performance because of the formation of strong gradient of concentration throughout the battery. Thus, for a given battery system a compromise between the energy density and the power has to be found in a rapid manner. The goal of this study is to propose a simple efficient methodology to optimize the thickness of the SPE and the positive electrode based on charge transport parameters, which allows to determine the effective limiting Li + diffusion coefficient. First, we rapidly establish the battery power performance thanks to a specific discharge protocol. Then, by using an approach based on the Sand equation a limiting current density is determined. A unique mother curve of the capacity as a function of the limiting current density is obtained whatever the electrode and electrolyte thicknesses. Finally, the effective limiting diffusion coefficient is estimated which in turn allows to design the best electrode depending on electrolyte thickness.

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Section: Introductionsupporting

confidence: 63%

Effect of Electrode and Electrolyte Thicknesses on All-Solid-State Battery Performance Analyzed With the Sand Equation

et al. 2020

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“…Furthermore, it is found that the capacity reduction at higher loads originates from the decreased contribution of NCM and LFP, respectively. However, it has to be noted, that the individual C-rate performances and overvoltage characteristics of the LMO, NCM and LFP electrodes not merely depend on the type of the active materials but also on additional properties, such as the particle size [20] , electrode design [21] as well as the amount and distribution of binder [22,23] and conductive additives. [22,24] Therefore, the SoC and rate dependence of the effective C-rates occurring in a blended electrode will vary with these quantities.…”

Section: Resultsmentioning

confidence: 99%

Investigations on the Effective Electric Loads in Blended Insertion Electrodes for Lithium‐Ion Batteries

et al. 2019

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Blending different types of active materials in one electrode is a great opportunity to improve the overall performance of lithium‐ion batteries. Despite considerable progress in the recent years, basic interactions, such as the specific impact of a single component on the blends’ properties, are not satisfactorily understood at the moment. In this study, the electric loads of the individual components of a blend are investigated using a special experimental setup in combination with model‐like blended electrodes. Systematic studies on the impact of type and mass fraction of the components are conducted for different nominal charge and discharge rates. The experiments reveal that the single components can be charged and discharged independent from each other, according to their characteristic redox activities and the overpotential during operation. This can lead to high effective electric loads (C‐rates) subjected to a single component despite a comparatively low total current applied to the electrode. Based on the experimental results, a simple model is developed to estimate maximum effective C‐rates of the individual components in an arbitrary blend system. These novel insights are discussed in regarding advantages and disadvantages of battery electrodes with multiple active materials.

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“…As found in previous research, the manganese element can enhance thermo-safety but has no electrochemical activity; the cobalt element can stabilize the layered structure and the nickel element mainly contributes to the specific capacity [17][18][19]. In order to obtain higher energy density, LNCMs with high nickel content, such as NCM 523, NCM 622, NCM 811, were studied [20][21][22]. Nevertheless, the increase of nickel content may sacrifice the structural stability, cycle and safety performance of LNCM.…”

Section: Introductionmentioning

confidence: 95%

High-Rate Layered Cathode of Lithium-Ion Batteries through Regulating Three-Dimensional Agglomerated Structure

Sheng

Deng

et al. 2020

Energies

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LiNixCoyMnzO2 (LNCM)-layered materials are considered the most promising cathode for high-energy lithium ion batteries, but suffer from poor rate capability and short lifecycle. In addition, the LiNi1/3Co1/3Mn1/3O2 (NCM 111) is considered one of the most widely used LNCM cathodes because of its high energy density and good safety. Herein, a kind of NCM 111 with semi-closed structure was designed by controlling the amount of urea, which possesses high rate capability and long lifespan, exhibiting 140.9 mAh·g−1 at 0.85 A·g−1 and 114.3 mAh·g−1 at 1.70 A·g−1, respectively. The semi-closed structure is conducive to the infiltration of electrolytes and fast lithium ion-transfer inside the electrode material, thus improving the rate performance of the battery. Our work may provide an effective strategy for designing layered-cathode materials with high rate capability.

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Understanding thickness and porosity effects on the electrochemical performance of LiNi0.6Co0.2Mn0.2O2-based cathodes for high energy Li-ion batteries

Cited by 151 publications

References 40 publications

Effect of Electrode and Electrolyte Thicknesses on All-Solid-State Battery Performance Analyzed With the Sand Equation

Effect of Electrode and Electrolyte Thicknesses on All-Solid-State Battery Performance Analyzed With the Sand Equation

Investigations on the Effective Electric Loads in Blended Insertion Electrodes for Lithium‐Ion Batteries

High-Rate Layered Cathode of Lithium-Ion Batteries through Regulating Three-Dimensional Agglomerated Structure

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