Explore the effect of Co Doping on P2-Na0.67MnO2 prepared by hydrothermal method as cathode materials for sodium ion batteries

Fu, Cheng Cheng; Wang, Juan; Li, Yong; Liu, Guoliang; Deng, Teng

doi:10.1016/j.jallcom.2022.165569

Cited by 17 publications

(15 citation statements)

References 42 publications

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“…In addition, it is noted that Co doping further increase the peak shift at high potential (4.24/4.05 V) owing to the similar mechanism to Ti. Because the oxidation of Co 3+ to Co 4+ occurs about 3.0 V, Co doping have little effect on the peak at low potential (2.96/2.78 V) [47]. The result demonstrates that Ti/Co co-doping is more conducive to suppress the phase transition in 4.0-4.3 V than Ti doping.…”

Section: Resultsmentioning

confidence: 92%

Ti/Co co-doped O3-Na(Ni_0.3Fe_0.2Mn_0.5)_0.85Ti_0.1Co_0.05O₂ with high rate and durable cathode material for sodium-ion batteries

Wang,

Li,

et al. 2023

Mater. Res. Express

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O3-type layered oxides are widely investigated as cathodes for Na-ion batteries (SIBs) due to their high theoretical capacities and splendid initial Coulombic efficiency. However, they suffer from fast capacity fading owing to the complicated phase transformations, especially in high cut-off voltage (>4 V). Herein, Ti and Co elements were simultaneously introduced to O3-Na(Ni0.3Fe0.2Mn0.5)0.85Ti0.1Co0.05O2 (NFMTC) cathode material, and the effects of Ti/Co co-doping on phase structure and electrochemical properties were analyzed in detail. The results reveal that Ti/Co co-doping can enhance the {010} plane, interlayer space and Na-ion diffusion kinetics, resulting in the improved electrochemical performance. Therefore, the NFMTC cathode delivers a high reversible capacity of 174.7 mAh g−1 at 0.1 C in the voltage range of 2.0–4.3 V and a good rate capability (53% of the initial capacity at 5 C) as well as an excellent capacity retention of 78% after 300 cycles at 1 C. This work maybe provides a guidance to explore high-performance cathode materials for sodium ion batteries.

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Section: Resultsmentioning

confidence: 92%

Ti/Co co-doped O3-Na(Ni_0.3Fe_0.2Mn_0.5)_0.85Ti_0.1Co_0.05O₂ with high rate and durable cathode material for sodium-ion batteries

Wang,

Li,

et al. 2023

Mater. Res. Express

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“…One of the key challenges of SIBs is to develop sustainable, low-cost, high-capacity, and stable cathodes. Recently, layered P2-type transition metal oxides Na x TMO 2 (with TM = Ti, V, Cr, Mn, Fe, Co, Ni, or a combination of them) have gathered great interest because of their high theoretical capacity and energy density, attractive price, and environmental friendliness. − They are constituted by sheets of TMO 6 octahedra, providing 2D transport channels with a low barrier for Na + ion diffusion between them. − Especially Na x MnO 2 has been the subject of extensive studies. − However, despite expectations, the electrochemical performance for Na x MnO 2 is often unsatisfactory. Upon Na + intercalation, part of Mn 4+ cations reduce to Mn 3+ and MnO 6 octahedra experience an anisotropic distortion with shortening/lengthening of two/four Mn–O bonds .…”

Section: Introductionmentioning

confidence: 99%

Structural Evolution of Air-Exposed Layered Oxide Cathodes for Sodium-Ion Batteries: An Example of Ni-doped Na_xMnO₂

Brugnetti,

Triolo,

Massaro

et al. 2023

Chem. Mater.

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Sodium-ion batteries have recently aroused the interest of industries as possible replacements for lithium-ion batteries in some areas. With their high theoretical capacities and competitive prices, P2-type layered oxides (Na x TMO 2 ) are among the obvious choices in terms of cathode materials. On the other hand, many of these materials are unstable in air due to their reactivity toward water and carbon dioxide. Here, Na 0.67 Mn 0.9 Ni 0.1 O 2 (NMNO), one of such materials, has been synthesized by a classic sol−gel method and then exposed to air for several weeks as a way to allow a simple and reproducible transition toward a Na-rich birnessite phase. The transition between the anhydrous P2 to the hydrated birnessite structure has been followed via periodic XRD analyses, as well as neutron diffraction ones. Extensive electrochemical characterizations of both pristine NMNO and the air-exposed one vs sodium in organic medium showed comparable performances, with capacities fading from 140 to 60 mAh g −1 in around 100 cycles. Structural evolution of the air-exposed NMNO has been investigated both with ex situ synchrotron XRD and Raman. Finally, DFT analyses showed similar charge compensation mechanisms between P2 and birnessite phases, providing a reason for the similarities between the electrochemical properties of both materials.

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“…The distortion negatively affects the Na + mobility and causes structural collapse during repeated cycles. 14 A crucial research route to improve the battery performance is element substitution such as electroactive ions like Ni, Co, Cu, and so forth or nonactive ions like Mg, Zn, Al, Ti, and so on. 15 In both cases, the primary objective is to enhance the structural stability during repeated cycling.…”

Section: Introductionmentioning

confidence: 99%

“…Due to uncontrollable Na loss, these two phases usually appear as mixed phases in the samples. , P2–P2′ phase transition due to the Jahn–Teller effect is considered to be responsible for the unsatisfactory battery performance of P2-Na 0.67 MnO 2 . The distortion negatively affects the Na + mobility and causes structural collapse during repeated cycles …”

Section: Introductionmentioning

confidence: 99%

“…During the material design process, careful consideration should be given to the valence state and ionic radius of the substitution ions . In the case of Na 0.67 MnO 2 , usually, ions with 2+ valence are promising since these ions are expected to decrease the number of Jahn–Teller-active Mn 3+ ions and hence suppress the P2–P2′ transition during cycling. , Xiao et al report several positive effects of Mg 2+ substitution to Mn sites such as mitigating the Jahn–Teller distortion and enhancing the stability of the layered structure due to the strong ionic interaction between Mg 2+ and O 2– ions . In addition, substituting Mn ions with larger ions shows the ability to expand the spacing between the layers which increases the Na + ion mobility in return …”

Section: Introductionmentioning

confidence: 99%

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High-Performance Ag-Doped Na_0.67MnO₂ Cathode: Operando XRD Study and Full-Cell Performance Analysis with Presodiated Anode

Kalyoncuoglu,

Ozgul,

Altundag

et al. 2023

ACS Appl. Energy Mater.

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The key challenges of Na-ion batteries are to design structurally stable electrodes and reach high-enough capacities with full-cells. In this study, we report the positive effects of Ag substitution/addition to Na0.67MnO2. We determined that some of the intended Ag was incorporated into the structure, while the rest remained in metallic form. Ag substitution/addition increases the capacity (208 mA h/g at C/3 rate) and improves the cycle life of Na0.67MnO2 (42% capacity fade with 100 cycles) in half-cells. We attribute these results to an enlarged interlayer spacing due to the large ionic radius of Ag, a suppressed Jahn–Teller effect due to the reduced number of Mn3+ ions, and an increased electrical conductivity due to the presence of metallic Ag. We also produced full-cells with an electrochemically presodiated hard carbon anode. We reached a very high initial capacity of 190 mA h/g at the C/3 rate, showing that Ag substituted/added Na0.67MnO2 is a promising candidate for commercialization of Na-ion batteries.

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Explore the effect of Co Doping on P2-Na0.67MnO2 prepared by hydrothermal method as cathode materials for sodium ion batteries

Cited by 17 publications

References 42 publications

Ti/Co co-doped O3-Na(Ni_0.3Fe_0.2Mn_0.5)_0.85Ti_0.1Co_0.05O₂ with high rate and durable cathode material for sodium-ion batteries

Ti/Co co-doped O3-Na(Ni_0.3Fe_0.2Mn_0.5)_0.85Ti_0.1Co_0.05O₂ with high rate and durable cathode material for sodium-ion batteries

Structural Evolution of Air-Exposed Layered Oxide Cathodes for Sodium-Ion Batteries: An Example of Ni-doped Na_xMnO₂

High-Performance Ag-Doped Na_0.67MnO₂ Cathode: Operando XRD Study and Full-Cell Performance Analysis with Presodiated Anode

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Explore the effect of Co Doping on P2-Na0.67MnO2 prepared by hydrothermal method as cathode materials for sodium ion batteries

Cited by 17 publications

References 42 publications

Ti/Co co-doped O3-Na(Ni0.3Fe0.2Mn0.5)0.85Ti0.1Co0.05O2 with high rate and durable cathode material for sodium-ion batteries

Ti/Co co-doped O3-Na(Ni0.3Fe0.2Mn0.5)0.85Ti0.1Co0.05O2 with high rate and durable cathode material for sodium-ion batteries

Structural Evolution of Air-Exposed Layered Oxide Cathodes for Sodium-Ion Batteries: An Example of Ni-doped NaxMnO2

High-Performance Ag-Doped Na0.67MnO2 Cathode: Operando XRD Study and Full-Cell Performance Analysis with Presodiated Anode

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Ti/Co co-doped O3-Na(Ni_0.3Fe_0.2Mn_0.5)_0.85Ti_0.1Co_0.05O₂ with high rate and durable cathode material for sodium-ion batteries

Ti/Co co-doped O3-Na(Ni_0.3Fe_0.2Mn_0.5)_0.85Ti_0.1Co_0.05O₂ with high rate and durable cathode material for sodium-ion batteries

Structural Evolution of Air-Exposed Layered Oxide Cathodes for Sodium-Ion Batteries: An Example of Ni-doped Na_xMnO₂

High-Performance Ag-Doped Na_0.67MnO₂ Cathode: Operando XRD Study and Full-Cell Performance Analysis with Presodiated Anode