Structural and electrochemical trends in mixed manganese oxides Na<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e610" altimg="si150.svg"><mml:msub><mml:mrow/><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>(M0.44Mn0.56)O<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e624" altimg="si187.svg"><mml:msub><mml:mrow/><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math> (M = Mn, Fe, Co, Ni) for sodium-ion battery cathode

Yu, Chol‐Jun; Pak, Y. S.; Kim, Chung-Hyok; Kim, Jin-Song; Ri, Kum-Chol; Ri, Kwang-Hyok; Choe, Song-Hyok; Cottenier, Stefaan

doi:10.1016/j.jpowsour.2021.230395

Cited by 14 publications

(13 citation statements)

References 70 publications

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“…Eventually, the number of Na atoms in Na n Mn 9 O 18 varies between 1 and 6, and correspondingly the Na content x in Na x MnO 2 increased from 0.11 to 0.66. 16…”

Section: Resultsmentioning

confidence: 99%

“…The DFT+ U approach in a simplified fashion 44 was applied to treat the localized 3d electrons of the Mn atom with the on-site effective Hubbard parameter of U eff = 5.0 eV as already confirmed in our previous works. 16,45…”

Section: Methodsmentioning

confidence: 99%

“…Spin polarization was considered with the ferromagnetic (FM) configuration, which was found to be energetically lower compared to the antiferromagnetic configuration. 16,17…”

Section: Methodsmentioning

confidence: 99%

“…14,15 Being characterized by the open structure with interlinked large tunnels, NMO is able to support the diverse intermediate phases during the charge/discharge processes with relatively fast Na + ion desertion/insertion kinetics. 16,17 For the intermediate phases of Na x MnO 2 , the sodium composition x was found to vary between 0.22 and 0.66, yielding a relatively high capacity of ∼121 mA h g −1 with the Mn 3+ /Mn 4+ redox potential ranging from 2 V to 4 V. 18 The NMO structure was also proved to be energetically stable and applicable in aqueous solution, indicating further reduction of cost and improvement of safety. 19–21 In the early days of development, however, poor cycling performance was reported for pure NMO, which retained only half of the initial capacity of 80 mA h g −1 after 50 cycles.…”

Section: Introductionmentioning

confidence: 99%

“…33,34 For transition metal oxides like NMO, intermixing between transition metals or ion substitution has also been accepted to be an effective way for improving the structural stability and electrode performance. 16,35 Meanwhile, ionic and electronic conduction, which is a key factor in cycling performance, can be understood and controlled by the physics and chemistry of native point defects and defect complexes. 36,37 First-principles calculations based on density functional theory (DFT) have been confirmed to be a powerful tool in the fundamental study of point defects in battery electrode materials.…”

Section: Introductionmentioning

confidence: 99%

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Point defects and their impact on electrochemical performance in Na_0.44MnO₂ for sodium-ion battery cathode application

Rim¹,

Jang²,

Kim³

et al. 2022

Phys. Chem. Chem. Phys.

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“…Eventually, the number of Na atoms in Na n Mn 9 O 18 varies between 1 and 6, and correspondingly the Na content x in Na x MnO 2 increased from 0.11 to 0.66. 16…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…Spin polarization was considered with the ferromagnetic (FM) configuration, which was found to be energetically lower compared to the antiferromagnetic configuration. 16,17…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Point defects and their impact on electrochemical performance in Na_0.44MnO₂ for sodium-ion battery cathode application

Rim¹,

Jang²,

Kim³

et al. 2022

Phys. Chem. Chem. Phys.

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Unusual Site‐Selective Doping in Layered Cathode Strengthens Electrostatic Cohesion of Alkali‐Metal Layer for Practicable Sodium‐Ion Full Cell

et al. 2021

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P2‐type Na0.67Ni0.33Mn0.67O2 is a dominant cathode material for sodium‐ion batteries due to its high theoretical capacity and energy density. However, charging P2‐type Na0.67Ni0.33Mn0.67O2 to voltages higher than 4.2 V (vs. Na+/Na) can induce detrimental structural transformation and severe capacity fading. Herein, stable cycling and moisture resistancy of Na0.67Ni0.33Mn0.67O2 at 4.35 V (vs. Na+/Na) are achieved through dual‐site doping with Cu ion at transition metal site (2a) and unusual Zn ion at Na site (2d) for the first time. The Cu ion doping in 2a site stabilizes the metal layer, while more importantly, the unusual alkali‐metal site doping by Zn ion serves as O2‐Zn2+O2‐ “pillar” for enhancing electrostatic cohesion between two adjacent transition metal layers, preventing the crack of active material along the a–b‐plane and restraining the generation of O2 phase upon deep desodiation. This unique dual‐site‐doped [Na0.67Zn0.05]Ni0.18Cu0.1Mn0.67O2 cathode exhibits a prominent cyclability with 80.6% capacity retention over 2000 cycles at an ultrahigh rate of 10C, demonstrating its great potential for practical applications. Impressively, the full cell devices with [Na0.67Zn0.05]Ni0.18Cu0.1Mn0.67O2 and commercial hard carbon as cathode and anode, respectively, can deliver a high energy density of 217.9 Wh kg‐1 and excellent cycle life over 1000 cycles.

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Suppressing the P2‐O2 phase transition and Na⁺/vacancy ordering in Na_0.67Ni_0.33Mn_0.67O₂ by a delicate multicomponent modulation strategy

Wan,

Chen,

Peng

et al. 2023

Battery Energy

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P2‐type Na0.67Ni0.33Mn0.67O2 is a promising cathode for sodium‐ion batteries with features of high specific capacity and air resistance, whereas its cycling stability and rate performance are dissatisfactory suffering from the disastrous P2‐O2 phase transition and Na+/vacancy ordering during sodium‐ion de/intercalation, which makes it an obstruction for future practical applications. Herein, a delicate multicomponent modulation strategy is proposed to tackle these two issues simultaneously, in which Li+ and Ti4+ are introduced to replace the Ni2+ and Mn4+, respectively, whereas the Na+ content is also designed according to the principle of charge balance. Consequently, the designed cathode (Na0.72Ni0.28Li0.05Mn0.57Ti0.10O2) can deliver an enchanting cycling stability of 80% at 1 C after 200 cycles along with a considerable rate performance of 82.7 mAh g−1 at 5 C. In situ X‐ray diffraction measurement demonstrates the destructive P2‐O2 phase transition is suppressed and converted into a P2‐Z phase transition with superior reversibility as well as smooth charge/discharge curves with better Na+/vacancy disordering. In addition, the full cell matched with hard carbon anode delivers an excellent energy density of 263.4 Wh kg−1 at 37.3 W kg−1, exhibiting great practicality. Our work presents a mean to rationally design the component of layered oxide cathode and achieve fabulous performance for sodium ion batteries.

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Structural and electrochemical trends in mixed manganese oxides Nax(M0.44Mn0.56)O2 (M = Mn, Fe, Co, Ni) for sodium-ion battery cathode

Cited by 14 publications

References 70 publications

Point defects and their impact on electrochemical performance in Na_0.44MnO₂ for sodium-ion battery cathode application

Point defects and their impact on electrochemical performance in Na_0.44MnO₂ for sodium-ion battery cathode application

Unusual Site‐Selective Doping in Layered Cathode Strengthens Electrostatic Cohesion of Alkali‐Metal Layer for Practicable Sodium‐Ion Full Cell

Suppressing the P2‐O2 phase transition and Na⁺/vacancy ordering in Na_0.67Ni_0.33Mn_0.67O₂ by a delicate multicomponent modulation strategy

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Structural and electrochemical trends in mixed manganese oxides Nax(M0.44Mn0.56)O2 (M = Mn, Fe, Co, Ni) for sodium-ion battery cathode

Cited by 14 publications

References 70 publications

Point defects and their impact on electrochemical performance in Na0.44MnO2 for sodium-ion battery cathode application

Point defects and their impact on electrochemical performance in Na0.44MnO2 for sodium-ion battery cathode application

Unusual Site‐Selective Doping in Layered Cathode Strengthens Electrostatic Cohesion of Alkali‐Metal Layer for Practicable Sodium‐Ion Full Cell

Suppressing the P2‐O2 phase transition and Na+/vacancy ordering in Na0.67Ni0.33Mn0.67O2 by a delicate multicomponent modulation strategy

Contact Info

Product

Resources

About

Point defects and their impact on electrochemical performance in Na_0.44MnO₂ for sodium-ion battery cathode application

Point defects and their impact on electrochemical performance in Na_0.44MnO₂ for sodium-ion battery cathode application

Suppressing the P2‐O2 phase transition and Na⁺/vacancy ordering in Na_0.67Ni_0.33Mn_0.67O₂ by a delicate multicomponent modulation strategy