P2-type layered Na0.67Cr0.33Mg0.17Ti0.5O2 for Na storage applications

Umezawa, Raizo; Tsuchiya, Yuka; Ishigaki, Tōru; Rajendra, Hongahally Basappa; Yabuuchi, Naoaki

doi:10.1039/d1cc00304f

Cited by 8 publications

(3 citation statements)

References 32 publications

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“…19 An identical trend was also reported in Na x Cr 1Àx Ti x O 2 , and the presence of Ti ions, which are randomly substituted for Cr ions, effectively suppresses in-plane Na + ion ordering coupled with charge ordering of Cr 3+ /Cr 4+ ions. 27,28 Similar phenomena in the electrochemical cycles are expected for P3 K 0.6Ày Cr 0.6 Ti 0.4 O 2 . In contrast, after charging to 4.3 V, the voltage plateaus are less pronounced, resulting in a monotonous voltage profile.…”

Section: Resultssupporting

confidence: 73%

P3-type layered K_0.6Cr_0.6Ti_0.4O₂ for potassium storage applications

et al. 2023

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Section: Resultssupporting

confidence: 73%

P3-type layered K_0.6Cr_0.6Ti_0.4O₂ for potassium storage applications

et al. 2023

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“…The layered oxide, P3 Na 0.58 Cr 0.58 Ti 0.42 O 2 , was synthesized by calcination as reported in our previous work (also see Figure S1). , The as-obtained P3 Na 0.58 Cr 0.58 Ti 0.42 O 2 phase shows a typical green color and was stored in argon, and this material is labeled as P3-NaCrTiO. All diffraction lines found in the XRD pattern of this sample (Figure a) indicate the crystallization of single-phase samples for P3-NaCrTiO without impurity phases.…”

Section: Resultsmentioning

confidence: 89%

“…Although Na 2 Ti 3 O 7 delivers a large reversible capacity of ∼180 mA h g –1 , and low reduction potential coupled with large voltage hysteresis (0.3 V) suffers from potential Na plating. Recently, chromium-substituted Ti-based layered oxides, such as P2 Na 0.6 Cr 0.6 Ti 0.4 O 2 and P3 Na 0.58 Cr 0.58 Ti 0.42 O 2 , magnesium-substituted Ti-based layered oxides, such as O3 Na 0.67 Mg 0.33 Ti 0.67 O 2 , and chromium/magnesium-bisubstituted Ti-based layered oxides, such as P2 Na 2/3 Cr 1/3 Mg 1/6 Ti 1/2 O 2 , have been reported. These substituted layered systems present a slightly higher operating voltage range, which is sufficient to prevent sodium plating.…”

Section: Introductionmentioning

confidence: 99%

Efficient Surface Passivation of Ti-Based Layered Materials by a Nonfluorine Branched Copolymer for Durable and High-Power Sodium-Ion Batteries

Campéon,

Umezawa,

Pandey

et al. 2024

ACS Appl. Mater. Interfaces

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There is a crucial need for low-cost energy storage technology based on abundant sodium ions to realize sustainable development with renewable energy resources. Poly(vinylidene fluoride) (PVDF) is applied as a binder in sodium-ion batteries (SIBs). Nevertheless, PVDF is also known to suffer from a larger irreversible capacity, especially when PVDF is used as the binder of negative electrode materials. In this research, a poly(acrylonitrile)grafted poly(vinyl alcohol) copolymer (PVA-g-PAN) is tested as a binder with Ti-based layered oxides as potential negative electrode materials for SIBs. The chemical stability tests of PVDF and PVA-g-PAN contacted with metallic sodium have been conducted, which reveals that PVDF experiences a defluorination process, while PVA-g-PAN demonstrates excellent chemical stability. Composite electrodes with PVA-g-PAN demonstrate superior electrochemical performances when compared with the PVDF binder, allowing improvement for initial CE, higher rate capability, and long cyclability over 1500 cycles. Detailed characterization of electrodes via soft X-ray photoelectron spectroscopy and field emission scanning electron microscopy demonstrates that the PVA-g-PAN branched structure allows a more uniform distribution of acetylene black with higher coatability, unlocking enhanced rate performances and efficient passivation of Tibased oxides without the excessive electrolyte decomposition. These findings open a new way to design practical and durable sodium-ion batteries with a high-power density.

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Achieving High Initial Coulombic Efficiency and Capacity in a Surface Chemical Grafting Layer of Plateau‐type Sodium Titanate

Zhang,

Li,

Wang

et al. 2024

ChemSusChem

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The plateau‐type sodium titanate with suitable sodiation potential is a promising anode candidate for high safe and high energy density of sodium‐ion batteries (SIBs). However, the poor initial Coulombic efficiency (ICE) and cyclic instability of sodium titanate are attributed to the unstable interfacial structure along with the decomposition of electrolytes, resulting in the continuous formation of solid electrolyte interface (SEI) film. To address this issue, a chemical grafting method is developed to fabricate a highly stable interface layer of inert Al2O3 on the sodium titanate anode, rendering the high ICE and excellent cycling stability. Based on theoretical calculations, NaPF6 are more likely adsorption on the Al2O3 surface and produce sodium fluoride. The formation of a thin and dense SEI film with rich sodium fluoride achieves the low interfacial resistances and charge‐transfer resistances. Benefitting from our design, the obtained sodium titanate exhibits a high ICE from 67.7% to 79.4% and an enhanced reversible capacity from 151 mAh g–1 to 181 mAh g–1 at 20 mA g–1, along with an increase in capacity retention from 56.5% to 80.6% after 500 cycles. This work heralds a promising paradigm for rational regulation of interfacial stability to achieve high‐performance anodes for SIBs.

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P2-type layered Na_0.67Cr_0.33Mg_0.17Ti_0.5O₂ for Na storage applications

Abstract: Na0.67Cr0.33Mg0.17Ti0.5O2 with a P2-type layered structure has been synthesized and examined as a negative electrode material for rechargeable sodium batteries. The layered oxide delivers a reversible capacity of > 90...

Cited by 8 publications

References 32 publications

P3-type layered K_0.6Cr_0.6Ti_0.4O₂ for potassium storage applications

P3-type layered K_0.6Cr_0.6Ti_0.4O₂ for potassium storage applications

Efficient Surface Passivation of Ti-Based Layered Materials by a Nonfluorine Branched Copolymer for Durable and High-Power Sodium-Ion Batteries

Achieving High Initial Coulombic Efficiency and Capacity in a Surface Chemical Grafting Layer of Plateau‐type Sodium Titanate

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P2-type layered Na0.67Cr0.33Mg0.17Ti0.5O2 for Na storage applications

Abstract: Na0.67Cr0.33Mg0.17Ti0.5O2 with a P2-type layered structure has been synthesized and examined as a negative electrode material for rechargeable sodium batteries. The layered oxide delivers a reversible capacity of > 90...

Cited by 8 publications

References 32 publications

P3-type layered K0.6Cr0.6Ti0.4O2 for potassium storage applications

P3-type layered K0.6Cr0.6Ti0.4O2 for potassium storage applications

Efficient Surface Passivation of Ti-Based Layered Materials by a Nonfluorine Branched Copolymer for Durable and High-Power Sodium-Ion Batteries

Achieving High Initial Coulombic Efficiency and Capacity in a Surface Chemical Grafting Layer of Plateau‐type Sodium Titanate

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P2-type layered Na_0.67Cr_0.33Mg_0.17Ti_0.5O₂ for Na storage applications

P3-type layered K_0.6Cr_0.6Ti_0.4O₂ for potassium storage applications

P3-type layered K_0.6Cr_0.6Ti_0.4O₂ for potassium storage applications