Electrochemical performance and structural stability of air-stable Na0.67Ni0.33Mn0.67-xTixO2 cathode materials for high-performance sodium-ion batteries

Tang, Ke; Huang, Yan; Xie, Xin; Cao, Shuang; Liu, Lei; Liu, Hong; Luo, Zhigao; Wang, Ying; Chang, Baobao; Shu, Hongbo; Wang, Xianyou

doi:10.1016/j.cej.2020.125725

Cited by 52 publications

(29 citation statements)

References 29 publications

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“…21 By contrast, Na 4/7 [□ 1/7 Ti 1/7 Mn 5/7 ]O 2 reveals superior cycling stability at 10 and 100 mA g −1 , maintaining 77% and 65%, respectively, of its initial discharge capacity after 50 cycles, showing that Ti-substitution improves the reversibility and cycling performance, consistent with data reported for Na 4/7 [□ 1/7 Ti 1/7 Mn 5/7 ]O 2 by Liu et al and other Ti-substituted materials. 26,27,29,34–41…”

Section: Resultsmentioning

confidence: 99%

Enhanced oxygen redox reversibility and capacity retention of titanium-substituted Na_4/7[□_1/7Ti_1/7Mn_5/7]O₂ in sodium-ion batteries

et al. 2022

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Section: Resultsmentioning

confidence: 99%

Enhanced oxygen redox reversibility and capacity retention of titanium-substituted Na_4/7[□_1/7Ti_1/7Mn_5/7]O₂ in sodium-ion batteries

et al. 2022

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“…The materials have good stability and can maintain their crystal structure even in a humid environment. However, when charging and discharging to a voltage at around 4.2 V, the oxygen layer will slip and the P2–O2 type phase transition causes its capacity to rapidly decay and cause the formation of an ordered phase transition superstructure of Na + /vacancies in the material. − In view of the above problems that affect the material’s cycle stability, it can be improved by charging to a lower voltage, − surface coating modification, , and metal ion doping. − However, optimizing the cutoff range of the electrical device reduces its reversible capacity. Material surface coatings, such as an aluminum oxide coating, can effectively reduce interactions between the electrode and electrolyte and reduce electrolyte decomposition, but its rate performance is often not ideal.…”

Section: Introductionmentioning

confidence: 99%

Improving the Na_0.67Ni_0.33Mn_0.67O₂ Cathode Material for High-Voltage Cyclability via Ti/Cu Codoping for Sodium-Ion Batteries

Pei

Liu

et al. 2022

ACS Appl. Energy Mater.

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P2-type Na0.67Ni0.33Mn0.67O2 cathode materials that show high discharge voltage and theoretical specific capacity have attracted extensive research, although the problem of rapid capacity decay under high voltage needs to be overcome. Here, a series of Na0.67Ni0.33–x Cu x Mn0.67–y Ti y O2 cathode materials were synthesized that had good cyclic stability and rate performance at a high voltage of 4.5 V. The combined analyses of Rietveld refinement X-ray diffractometer (XRD), X-ray photoelectron spectroscope (XPS), Raman, and transmission electron microscope (TEM) showed that Ti4+ and Cu2+ had been successfully incorporated into the material crystal lattice. The Ti/Cu dual-doping materials operated at a high mid-voltage of ∼3.2 V vs Na/Na+ and exhibited a reversible capacity of 93 mA·h·g–1 at 5C. The voltage step of Ti4+/Cu2+-doped materials at ∼4.2 V was clearly suppressed with increased Cu content, and NNMT-0.14Cu materials exhibited an initial discharge capacity of 153.2 mA·h·g–1 owing to Cu contributing to reversible capacity based on Cu2+/Cu3+. Galvanostatic intermittent titration technology measurements showed that’ the Na+ mobility of NNMT-0.14Cu materials was improved.

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“…To improve the air stability of Mn-based Na x TMO 2 , effective strategies typically aim to reduce the thermodynamic favorability of chemical and structural changes, such as doping, substitution, and composition modulation, or to avoid direct contact between active oxides and moisture by coating. − In addition, enhancing the moisture tolerance of layered oxides by structural engineering is proven to be effective at solving the poor air stability issue. ,, …”

Section: Structural Stability Of Mn-based Na X Tmo2mentioning

confidence: 99%

Synthesis, Structure, Electrochemical Mechanisms, and Atmospheric Stability of Mn-Based Layered Oxide Cathodes for Sodium Ion Batteries

Zuo

Yang

2022

Acc. Mater. Res.

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Metrics & MoreArticle Recommendations CONSPECTUS:The commercialization of lithium ion batteries (LIBs) triggered a new era of portable electronics and electric vehicles, which changed our daily life remarkably. Meanwhile, LIBs are promising as large-scale storage batteries in green electric grids by using renewable energy as the primary energy source. Driven by the concerns of lithium depletion and the turbulent price of Li, Ni, and Co mineral resources, sodium ion batteries (NIBs) have been intensively investigated and are becoming a strong competitor for large-scale energy storage, such as in national grids. As an inevitable component of NIBs, the cathode determines all of the critical properties of NIBs, such as cost, safety, energy/power densities, and cycling life, and an ideal cathode material should be sustainable and easy-to-use in scalable production, transportation, and storage. Layered sodium transition metal oxide (Na x TMO 2 ), especially the Mn-based Na x TMO 2 , has been chosen as a family of leading cathodes for the upcoming commercial NIBs because of a great variety of compositions and redox-active elements, such as Mn, Fe, Cu, Ni, Co, Cr, Ir, Ru, and even O. The success or failure of the commercialization of these materials relies on the resolution of two critical challenges. The first is the electrochemical irreversibility related to the phase transformations and electrolyte decomposition during repeated charging and discharging processes. The second challenge is the chemical and structural sensitivity when Mn-based Na x TMO 2 is exposed to moist air. These air-sensitive oxides need to be prepared and stored in inert or dry atmospheres, thus increasing the costs of production, storage, and transportation. During the past decade, we focused on investigating the degradation mechanisms and exploring effective strategies to enhance the atmospheric stability and electrochemical reversibility of Mn-based Na x TMO 2 . In addition, the materials synthesis and charge-compensation mechanisms, which are critical to the electrochemical characteristics of sodium layered oxides, have also been taken into consideration in our research.In this Account, we highlight recent efforts to understand the synthesis, phase diversity, atmospheric stability, and electrochemical reaction mechanisms of Na x MnO 2 and their analogues, with a special focus on the structure and its evolutions. This Account starts with introducing the polymorphism and synthesis of the Na x MnO 2 series. Next, we present the cause and control of offstoichiometry in the P2-type Na x MnO 2 series as well as its effect on electrochemical performance and structural transformations during Na + (de)intercalation. Then we summarize the mechanical, electrochemical, and atmospheric structural stability as well as the corresponding modification strategies of Mn-based Na x TMO 2 . At the end of this Account, we emphasize the charge-compensation mechanisms with a special focus on anionic redox reactions. On the basis of these insights, a brief outlook and ...

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Electrochemical performance and structural stability of air-stable Na0.67Ni0.33Mn0.67-xTixO2 cathode materials for high-performance sodium-ion batteries

Cited by 52 publications

References 29 publications

Enhanced oxygen redox reversibility and capacity retention of titanium-substituted Na_4/7[□_1/7Ti_1/7Mn_5/7]O₂ in sodium-ion batteries

Enhanced oxygen redox reversibility and capacity retention of titanium-substituted Na_4/7[□_1/7Ti_1/7Mn_5/7]O₂ in sodium-ion batteries

Improving the Na_0.67Ni_0.33Mn_0.67O₂ Cathode Material for High-Voltage Cyclability via Ti/Cu Codoping for Sodium-Ion Batteries

Synthesis, Structure, Electrochemical Mechanisms, and Atmospheric Stability of Mn-Based Layered Oxide Cathodes for Sodium Ion Batteries

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Electrochemical performance and structural stability of air-stable Na0.67Ni0.33Mn0.67-xTixO2 cathode materials for high-performance sodium-ion batteries

Cited by 52 publications

References 29 publications

Enhanced oxygen redox reversibility and capacity retention of titanium-substituted Na4/7[□1/7Ti1/7Mn5/7]O2 in sodium-ion batteries

Enhanced oxygen redox reversibility and capacity retention of titanium-substituted Na4/7[□1/7Ti1/7Mn5/7]O2 in sodium-ion batteries

Improving the Na0.67Ni0.33Mn0.67O2 Cathode Material for High-Voltage Cyclability via Ti/Cu Codoping for Sodium-Ion Batteries

Synthesis, Structure, Electrochemical Mechanisms, and Atmospheric Stability of Mn-Based Layered Oxide Cathodes for Sodium Ion Batteries

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Product

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Enhanced oxygen redox reversibility and capacity retention of titanium-substituted Na_4/7[□_1/7Ti_1/7Mn_5/7]O₂ in sodium-ion batteries

Enhanced oxygen redox reversibility and capacity retention of titanium-substituted Na_4/7[□_1/7Ti_1/7Mn_5/7]O₂ in sodium-ion batteries

Improving the Na_0.67Ni_0.33Mn_0.67O₂ Cathode Material for High-Voltage Cyclability via Ti/Cu Codoping for Sodium-Ion Batteries