The effect of electrolyte on the electrochemical properties of Na/α-NaMnO2 batteries

Jo, Inho; Ryu, Ho-Suk; Gu, Dae-Geun; Park, Jin-Soo; Ahn, In-Shup; Ahn, Hyo‐Jun; Nam, Tae Hyun; Kim, Ki-Won

doi:10.1016/j.materresbull.2014.02.024

Cited by 25 publications

(16 citation statements)

References 16 publications

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“…The representation of the two sodium manganite structures is shown in Figure 1. Despite their promising properties, both from the electrochemical and manufacture points of view, physico-chemical and electrochemical features of both monoclinic and orthorhombic NaMnO2 have been reported only in few studies [13][14][15]. Here, we illustrate a comparison between the α-and β-polymorphs of the NaMnO2 compound.…”

Section: Introductionmentioning

confidence: 87%

Monoclinic and Orthorhombic NaMnO2 for Secondary Batteries: A Comparative Study

et al. 2021

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In this manuscript, we report a detailed physico-chemical comparison between the α- and β-polymorphs of the NaMnO2 compound, a promising material for application in positive electrodes for secondary aprotic sodium batteries. In particular, the structure and vibrational properties, as well as electrochemical performance in sodium batteries, are compared to highlight differences and similarities. We exploit both laboratory techniques (Raman spectroscopy, electrochemical methods) and synchrotron radiation experiments (Fast-Fourier Transform Infrared spectroscopy, and X-ray diffraction). Notably the vibrational spectra of these phases are here reported for the first time in the literature as well as the detailed structural analysis from diffraction data. DFT+U calculations predict both phases to have similar electronic features, with structural parameters consistent with the experimental counterparts. The experimental evidence of antisite defects in the beta-phase between sodium and manganese ions is noticeable. Both polymorphs have been also tested in aprotic batteries by comparing the impact of different liquid electrolytes on the ability to de-intercalated/intercalate sodium ions. Overall, the monoclinic α-NaMnO2 shows larger reversible capacity exceeding 175 mAhg−1 at 10 mAg−1.

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Section: Introductionmentioning

confidence: 87%

Monoclinic and Orthorhombic NaMnO2 for Secondary Batteries: A Comparative Study

et al. 2021

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“…In order to better understand the effect of Li extraction on the structure of monoclinic LiMnO 2 , the barrier for migration of Mn-ions into the Li layer was calculated for the above three different types of vacancies. 17,18 No migration of Mn-ions into the Na layer has been reported when the same quantity of Na-ions are removed. 3a shows that it is rather difficult for the Mn-ions to migrate into the Li layer when only 1/32 Li-ions are extracted from LiMnO 2 .…”

Section: Migration Of Mn-ions Into the Alkali Layermentioning

confidence: 99%

“…[11][12][13][14] The Na-storage capacities of these materials are much lower than their Li-storage capacities. [16][17][18] A dumbbell model was proposed to explain the structural instability of Li 0.5 MnO 2 . Armstrong et al 15 synthesized it by an ion exchange method but found that its structure transformed into a spinel upon delithiation and its capacity faded quickly with cycling.…”

Section: Introductionmentioning

confidence: 99%

Understanding structural stability of monoclinic LiMnO₂ and NaMnO₂ upon de-intercalation

Tian

Gao

Wang

et al. 2016

Phys. Chem. Chem. Phys.

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Although many strategies for Li-ion batteries have been successfully transplanted in Na-ion batteries, distinctions between these two kinds of secondary batteries are still clear. For example, monoclinic-NaMnO2 demonstrates high structural stability during charging and discharging, but its iso-structured LiMnO2 transforms to a spinel upon de-lithiation and the specific capacity fades quickly with cycling. In this work, first-principles calculations were carried out to have a better understanding of their difference in structural stability upon de-intercalation. Our studies show that the Mn-ions migrate into the Li layer of LiMnO2via an interstitial tetrahedral O atom when a triple-vacancy of the Li-ion is produced. This process follows a double-vacancy mechanism and results in blocking of the diffusion of other Li-ions. In contrast, it is very difficult for the Mn-ions to migrate into the Na layer in NaMnO2 even when triple-vacancies are generated. The drastic differences between LiMnO2 and NaMnO2 in charge distribution and in the length of the Mn-O bond are believed to be responsible for the Mn-ion migration in them. These findings provide revelations for understanding the de-intercalation behaviors of electrode materials for Li- and Na-ion batteries as well as insights into the structural stability of LiMnO2vs. NaMnO2 upon alkali metal ion de-intercalation.

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“…Although it has lower ionic conductivity [14], TEGDME is more stable than the common electrolyte of Li-ion battery. More details about the cathodes and electrolytes preparations can be found elsewhere [15].…”

Section: Methodsmentioning

confidence: 99%

Discharging temperature dependence of Li 2 O 2 formation and its effect on charging polarization for Li–O 2 Battery

Song

Chen

et al. 2015

Materials Research Bulletin

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The effect of electrolyte on the electrochemical properties of Na/α-NaMnO2 batteries

Cited by 25 publications

References 16 publications

Monoclinic and Orthorhombic NaMnO2 for Secondary Batteries: A Comparative Study

Monoclinic and Orthorhombic NaMnO2 for Secondary Batteries: A Comparative Study

Understanding structural stability of monoclinic LiMnO₂ and NaMnO₂ upon de-intercalation

Discharging temperature dependence of Li 2 O 2 formation and its effect on charging polarization for Li–O 2 Battery

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The effect of electrolyte on the electrochemical properties of Na/α-NaMnO2 batteries

Cited by 25 publications

References 16 publications

Monoclinic and Orthorhombic NaMnO2 for Secondary Batteries: A Comparative Study

Monoclinic and Orthorhombic NaMnO2 for Secondary Batteries: A Comparative Study

Understanding structural stability of monoclinic LiMnO2 and NaMnO2 upon de-intercalation

Discharging temperature dependence of Li 2 O 2 formation and its effect on charging polarization for Li–O 2 Battery

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Understanding structural stability of monoclinic LiMnO₂ and NaMnO₂ upon de-intercalation