Exceptionally increased reversible capacity of O3-type NaCrO2 cathode by preventing irreversible phase transition

Ko, Wonseok; Cho, Min-kyung; Kang, Jungmin; Park, Hyun-Young; Ahn, Jinho; Lee, Yongseok; Lee, Sangyeop; Heo, Kwang; Hong, Jin; Yoo, Jung-Keun; Kim, Jongsoon

doi:10.1016/j.ensm.2022.01.023

Cited by 20 publications

(14 citation statements)

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“…[135] It was proposed that the introduction of an antimony ion, Sb 5+ (more than 0.14 mol), with a fixed oxidation state and high electronegativity, would lead to thermodynamically unfavorable Cr migration. [140] Therefore, the optimized O3-Na 0.72 Cr 0.86 Sb 0.14 O 2 cathode undergoes a reversible O3-P3 phase transition over a cathodes. Reproduced with permission.…”

Section: Potential O3-type Layered-oxide Cathodesmentioning

confidence: 93%

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Practical Cathodes for Sodium‐Ion Batteries: Who Will Take The Crown?

Liang,

Hwang,

Sun

2023

Advanced Energy Materials

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In recent decades, sodium‐ion batteries (SIBs) have received increasing attention because they offer cost and safety advantages and avoid the challenges related to limited lithium/cobalt/nickel resources and environmental pollution. Because the sodium storage performance and production cost of SIBs are dominated by the cathode performance, developing cathode materials with large‐scale production capacity is the key to achieving commercial applications of SIBs. Therefore, developing host materials with high energy density, long cycling life, low production cost, and high chemical/environmental stability is crucial for implementing advanced SIBs. Among the developed cathode materials for SIBs, O3‐type sodiated transition‐metal oxides have attracted extensive attention owing to their simple synthesis methods, high theoretical specific capacity, and sufficient Na content. However, the relatively large Na‐ion radius leads to sluggish diffusion kinetics and inevitable complex phase transitions during the deintercalation/intercalation process, resulting in poor rate capability and cycling stability. Therefore, this review comprehensively summarizes the research progress and modification strategies for O3‐type cathodes, including the component design, surface modification, and optimization of synthesis methods. This work aims to guide the development of commercial layered oxides and provide technical support for the next generation of energy‐storage systems.

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Section: Potential O3-type Layered-oxide Cathodesmentioning

confidence: 93%

mentioning

confidence: 99%

Practical Cathodes for Sodium‐Ion Batteries: Who Will Take The Crown?

Liang,

Hwang,

Sun

2023

Advanced Energy Materials

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“…Sodium-ion batteries (SIBs) are some of the most promising candidates for large-scale electrical energy storage systems owing to their low cost, high abundance, and worldwide availability of Na. − For the past few decades, although great attention has been paid to investigating a large number of electrode materials with the desired properties in SIBs, it is still a challenge to realize high-performance SIBs due to the inadequate energy density and life span of the cathode materials. , Numerous materials such as oxides, sulfates, cyanides, and phosphates have been explored as cathodes for SIBs. − Among them, sodium-based layered transition-metal (TM) materials with an O3-type or a P2-type structure have attracted the most interest due to their simple synthesis and high capacities. Although O3-type oxides can deliver a high initial reversible capacity, they suffer from severe capacity decay due to the complex phase transition and high Na + migration energy barriers, impeding their application. , Compared to O3-type materials, P2-type cathodes are more favorable for SIBs due to their large interlayer spacing, high structural stability, and open Na + diffusion pathways . However, the Na-deficient P2-type Na x TMO 2 ( x ranges from 0.5 to 0.7, TM = Fe, Co, Ni, Mn, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…Although O3-type oxides can deliver a high initial reversible capacity, they suffer from severe capacity decay due to the complex phase transition and high Na + migration energy barriers, impeding their application. 14,15 Compared to O3-type materials, P2-type cathodes are more favorable for SIBs due to their large interlayer spacing, high structural stability, and open Na + diffusion pathways. 16 However, the Na-deficient P2-type Na x TMO 2 (x ranges from 0.5 to 0.7, TM = Fe, Co, Ni, Mn, etc.)…”

Section: Introductionmentioning

confidence: 99%

Realizing High-Performance Cathodes with Cationic and Anionic Redox Reactions in High-Sodium-Content P2-Type Oxides for Sodium-Ion Batteries

Liu

Zheng

Liu

et al. 2023

ACS Appl. Mater. Interfaces

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P2-type layered transition-metal oxides with anionic redox reactions are promising cathodes for sodium-ion batteries. In this work, a high-sodium-content P2-type Na7/9Li1/9Mg1/9Cu1/9Mn2/3O2 (NLMC) cathode material is prepared by substituting Li/Mg/Cu for Mn sites in Na2/3MnO2. The Li/Mg ions trigger the anionic redox reaction, while the Cu ions enhance the structure stability during electrochemical cycling. As a result, the oxide has a high reversible capacity of 225 mAh g–1 originating from both cationic and anionic redox activities with a capacity retention of 77% after 100 cycles. The migration energy barrier and Na ion diffusion kinetics are studied using density functional theory (DFT) calculations and the galvanostatic intermittent titration technique. Furthermore, X-ray diffraction, DFT, scanning electron microscopy, and transmission electron microscopy are applied to reveal the structural evolution and charge compensation of NLMC, providing a thorough understanding of the structural and morphology evolution of Na-deficient oxides during cycling. The results are inspiring for the design of a high-Na content P2-type layered oxide cathode for sodium-ion batteries.

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“…Na 2 TiFeF 7 also exhibited a high‐average operation voltage of ≈3.37 V (vs Na + /Na) owing to the high theoretical Fe 2+ /Fe 3+ redox potential of ≈3.75 V, which is much higher than other Na‐layered oxide cathode materials with the practical capacity of above 160 mAh g −1 . [ 27 ] Through first‐principles calculation, it was demonstrated that the band‐gap energy of Na 2 TiFeF 7 (≈1.83 eV) is lower than that of other Fe‐based fluoride materials and similar to that of the Fe‐based oxide material, which implies that Na 2 TiFeF 7 can exhibit higher electronic conductivity compared to other Fe‐based fluoride materials. Furthermore, we confirmed that the theoretical activation barrier energy is sufficiently low (≈477.68 meV) for facile Na + diffusion in the structure of Na 2 TiFeF 7 , that can boost up the power‐capability.…”

Section: Introductionmentioning

confidence: 99%

Highly Stable Fe²⁺/Ti³⁺‐Based Fluoride Cathode Enabling Low‐Cost and High‐Performance Na‐Ion Batteries

Kang

Ahn

Park

et al. 2022

Adv Funct Materials

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Grid‐scale energy storage system is the need of batteries with low‐cost, high‐energy‐density, and long cycle life. The requirement promotes the discovery of cathode materials enabling the storage of charge carrier ion within the open framework crystal structure having multi‐dimensional diffusion path exhibiting small volume change. Herein, Na2TiFeF7 is reported as a promising fluoride‐based cathode material for sodium‐ion batteries (SIBs). Through combined studies using various experiments and first‐principles calculations, it is confirmed that Na2TiFeF7 with 3D diffusion pathway delivers a specific capacity of ≈185 mAh g−1 at C/20 with an average operation voltage of ≈3.37 V (vs Na+/Na) including the high Fe2+/3+ redox potential (≈3.75 V). Even at 5C, a specific capacity of ≈136 mAh g−1 is retained (≈73% of its theoretical capacity) owing to the low band gap energy (≈1.83 eV) and the low activation barrier energies (≈477.68 meV) required for facile Na+ diffusion, indicating the excellent power‐capability. Moreover, Na2TiFeF7 composed of three‐dimensionally interconnected (Fe, Ti)F6 octahedra delivers an outstanding capacity retention of ≈71% after 600 cycles at 1 C owing to the small structural volume change (≈0.96%) during Na+ de/intercalation. These findings provide insight into the development of fluoride‐based novel cathode materials for high‐performance SIBs.

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Exceptionally increased reversible capacity of O3-type NaCrO2 cathode by preventing irreversible phase transition

Cited by 20 publications

References 45 publications

Practical Cathodes for Sodium‐Ion Batteries: Who Will Take The Crown?

Practical Cathodes for Sodium‐Ion Batteries: Who Will Take The Crown?

Realizing High-Performance Cathodes with Cationic and Anionic Redox Reactions in High-Sodium-Content P2-Type Oxides for Sodium-Ion Batteries

Highly Stable Fe²⁺/Ti³⁺‐Based Fluoride Cathode Enabling Low‐Cost and High‐Performance Na‐Ion Batteries

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Exceptionally increased reversible capacity of O3-type NaCrO2 cathode by preventing irreversible phase transition

Cited by 20 publications

References 45 publications

Practical Cathodes for Sodium‐Ion Batteries: Who Will Take The Crown?

Practical Cathodes for Sodium‐Ion Batteries: Who Will Take The Crown?

Realizing High-Performance Cathodes with Cationic and Anionic Redox Reactions in High-Sodium-Content P2-Type Oxides for Sodium-Ion Batteries

Highly Stable Fe2+/Ti3+‐Based Fluoride Cathode Enabling Low‐Cost and High‐Performance Na‐Ion Batteries

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Product

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Highly Stable Fe²⁺/Ti³⁺‐Based Fluoride Cathode Enabling Low‐Cost and High‐Performance Na‐Ion Batteries