Electrochemical Investigations on the Effect of Mg-Substitution in Li<sub>2</sub>MnO<sub>3</sub>Cathode

Torres-Castro, Loraine; Abreu-Sepúlveda, María; Katiyar, Ram S.; Manivannan, A.

doi:10.1149/2.0661707jes

Cited by 7 publications

(4 citation statements)

References 17 publications

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“…BET surface areas were determined to be ∼1.00 and ∼3.16 m 2 /g for SLMO and PLMO, respectively. Despite these values being close to the measurement limits of N 2 BET, they are in good agreement with values reported for solid-state 15,55 and Pechini sol−gel 56 synthesized LMO. SEM images show substantial differences in the morphology of the LMO samples, with Figure 6c,d illustrating the porous nature of the PLMO sample, a likely consequence of the gas evolution occurring during the removal of the organic component, as consistent with the higher surface area.…”

Section: ■ Experimental Sectionsupporting

confidence: 90%

Influence of Synthesis Routes on the Crystallography, Morphology, and Electrochemistry of Li₂MnO₃

Menon

Ojwang

Willhammar

et al. 2020

ACS Appl. Mater. Interfaces

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With the potential of delivering reversible capacities of up to 300 mAh/g, Li-rich transition-metal oxides hold great promise as cathode materials for future Li-ion batteries. However, a cohesive synthesis–structure–electrochemistry relationship is still lacking for these materials, which impedes progress in the field. This work investigates how and why different synthesis routes, specifically solid-state and modified Pechini sol–gel methods, affect the properties of Li2MnO3, a compositionally simple member of this material system. Through a comprehensive investigation of the synthesis mechanism along with crystallographic, morphological, and electrochemical characterization, the effects of different synthesis routes were found to predominantly influence the degree of stacking faults and particle morphology. That is, the modified Pechini method produced isotropic spherical particles with approximately 57% faulting and the solid-state samples possessed heterogeneous morphology with approximately 43% faulting probability. Inevitably, these differences lead to variations in electrochemical performance. This study accentuates the importance of understanding how synthesis affects the electrochemistry of these materials, which is critical considering the crystallographic and electrochemical complexities of the class of materials more generally. The methodology employed here is extendable to studying synthesis–property relationships of other compositionally complex Li-rich layered oxide systems.

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Section: ■ Experimental Sectionsupporting

confidence: 90%

Influence of Synthesis Routes on the Crystallography, Morphology, and Electrochemistry of Li₂MnO₃

Menon

Ojwang

Willhammar

et al. 2020

ACS Appl. Mater. Interfaces

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“…They found that Cr doping increases capacity and Na doping suppresses voltage-decay. Similar doping investigations using Mg, [24][25][26] Ni, [25][26][27][28][29][30][31][32][33][34][35] Co, 28,31,36,37 and N [38][39][40] on the electrode of lithium-ion batteries have demonstrated improved electrochemical performance.…”

mentioning

confidence: 81%

Enhancement of Electrochemical Properties of Lithium Rich Li₂RuO₃ Cathode Material

Moradi

Lanjan

Srinivasan

2020

J. Electrochem. Soc.

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Lithium-rich layered Ru-based oxides are interesting cathode materials due to their high energy density and reversible capacity. However, their poor structural stability and voltage decay hinder their broad commercial applicability. To address this, we investigate the co-doping strategy on Li 2 RuO 3 (LRO) for improved battery performance using a combination of quantum mechanics, molecular dynamics, and pseudo-1-dimensional (P1D) formulations. Specifically, in addition to the effect of Ti as a dopant in Li 2 Ru 0.5 Ti 0.5 O 3 (LTO), the effect of three co-dopants, Tc, Rh, or Pd in Li 2 Ru 0.5 Ti 0.25 M 0.25 O 3 has also been studied. It has been found that the co-doping strategy significantly improves the thermal stability of LRO. Tc and Ti improve structural stability by reducing the oxygen removal reaction. Pd and Tc reduce the bandgap considerably, leading to higher electrical conductivity. The results show that co-doping minimizes the energy required for Li-ions diffusion. In particular, Tc significantly enhances the Li-ions diffusion in LRO and LTO. Further co-dopants Rh, Pd, and Tc improve the maximum voltage of LRO, as well as the voltage stability by reducing the voltage reduction. Finally, P1D simulations show that while LTO provides the highest voltage and power operation, doping it with Tc and Pd increases its efficiency by reducing the ohmic potential drop and diffusion polarization.

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“…5e. [35][36][37][38][39][40] With the further decrease of Li content, the as-obtained MOF-Li 1.25 MnO 3 shows higher CE of 84.9% in the first charge-discharge process (Fig. 5d), indicating that the severe capacity loss has been alleviated.…”

Section: Limnomentioning

confidence: 96%

Enhancing the Electrochemical Performance of Li₂-xMnO₃ via Dual Strategies: Using MOF-Derived Manganese Oxide Precursor and Tuning Li Content

Xu,

Hou,

Fang

et al. 2023

J. Electrochem. Soc.

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Cathode materials play a crucial role in determining the electrochemical properties and fabrication cost of Lithium-ion batteries (LIBs). Li2MnO3 has garnered increasing attentions due to its high theoretical capacity, but it suffers from severe issues, such as structural deterioration and irreversible capacity loss. In this paper, we propose a novel strategy to synthesize Li2-xMnO3 cathodes using MOF-derived manganese oxide via a simple solid-state reaction. When used as cathodes for LIBs, the MOF-Li2MnO3 exhibits a high reversible capacity of 92.5 mAh g-1 after 120 cycles at 25 mA g-1, as compared to pristine Li2MnO3 (31.7 mAh g-1). Additionally, hybrid phases including orthorhombic-LiMnO2 and cubic LiMn2O4 are introduced into Li-deficient materials, which exhibit different electrochemical behaviors from MOF-Li2MnO3. The MOF-Li1.75MnO3 delivers an unprecedented capacity of 151.9 mAh g-1 after 120 cycles at 25 mA g-1. Overall, the synergistic effect of adopting MOF-derived precursor and inducing multiphase by tuning Li content is conducive to enhancing the electrochemical performance of Li2MnO3 cathode.

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Electrochemical Investigations on the Effect of Mg-Substitution in Li₂MnO₃Cathode

Cited by 7 publications

References 17 publications

Influence of Synthesis Routes on the Crystallography, Morphology, and Electrochemistry of Li₂MnO₃

Influence of Synthesis Routes on the Crystallography, Morphology, and Electrochemistry of Li₂MnO₃

Enhancement of Electrochemical Properties of Lithium Rich Li₂RuO₃ Cathode Material

Enhancing the Electrochemical Performance of Li₂-xMnO₃ via Dual Strategies: Using MOF-Derived Manganese Oxide Precursor and Tuning Li Content

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Electrochemical Investigations on the Effect of Mg-Substitution in Li2MnO3Cathode

Cited by 7 publications

References 17 publications

Influence of Synthesis Routes on the Crystallography, Morphology, and Electrochemistry of Li2MnO3

Influence of Synthesis Routes on the Crystallography, Morphology, and Electrochemistry of Li2MnO3

Enhancement of Electrochemical Properties of Lithium Rich Li2RuO3 Cathode Material

Enhancing the Electrochemical Performance of Li2-xMnO3 via Dual Strategies: Using MOF-Derived Manganese Oxide Precursor and Tuning Li Content

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Product

Resources

About

Electrochemical Investigations on the Effect of Mg-Substitution in Li₂MnO₃Cathode

Influence of Synthesis Routes on the Crystallography, Morphology, and Electrochemistry of Li₂MnO₃

Influence of Synthesis Routes on the Crystallography, Morphology, and Electrochemistry of Li₂MnO₃

Enhancement of Electrochemical Properties of Lithium Rich Li₂RuO₃ Cathode Material

Enhancing the Electrochemical Performance of Li₂-xMnO₃ via Dual Strategies: Using MOF-Derived Manganese Oxide Precursor and Tuning Li Content