Highly-stable P2–Na0.67MnO2 electrode enabled by lattice tailoring and surface engineering

Zuo, Wenhua; Qiu, Jimin; Liu, Xiangsi; Zheng, Bizhu; Zhao, Yang; Li, Jialin; He, Huajin; Zhou, Ke; Xiao, Zhumei; Li, Qi; Ortiz, Gregório F.; Yang, Yong

doi:10.1016/j.ensm.2019.11.024

Cited by 115 publications

(148 citation statements)

References 47 publications

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“…As shown in Fig. 5a , the pristine Na 0.67 MnO 2 shows a high initial discharge capacity of 176 mAh g −1 at the current density of 12 mA g −1 within 2.0–4.4 V. After 50 cycles, 66 % of the initial capacity was retained, which coincides well with the previous results 10 , 23 . For the hydrated Na 0.67 MnO 2 electrode, the reversible capacity is negligible at the initial cycles.…”

Section: Resultssupporting

confidence: 90%

“…In conclusion, with the increase of temperature, the hydrated Na 0.67 MnO 2 sample undergoes dehydration and NaHCO 3 decomposition (70–130 °C), deprotonation (130–217 °C), Na 2 CO 3 decomposition (>130 °C) and the recrystallization of P2 phase (>483 °C) process. In our recent work 23 , we demonstrate that Na 0.67 Zn 0.1 Mn 0.67 O 2 is a promising Na-ion battery cathode with outstanding cycling stability and better air-stability than Na 0.67 MnO 2 . Therefore, we also performed the in situ variable-temperature XRD of totally hydrated Na 0.67 Zn 0.1 Mn 0.9 O 2 powder.…”

Section: Resultsmentioning

confidence: 87%

“…The pristine Na x TmO 2 cathodes have been synthesized by high-temperature solid-state reactions 12 , 23 . Stoichiometric amounts of raw materials, e.g.…”

Section: Methodsmentioning

confidence: 99%

“…irreversible phase transitions during cycling, insufficient electrochemical performances and air/moisture instability 5 , 15 . The undesired structural transformations in charge/discharge processes, such as P2-O2 in Na 0.67 Ni 0.33 Mn 0.67 O 2 16 – 20 , P2-P2’ in Na 0.67 MnO 2 10 , 21 – 23 and O3-P3 in NaNi 0.5 Mn 0.5 O 2 24 , can be suppressed or delayed by element substitution, thus resulting in improved cycling stability and rate capability. The contact between air-instable Na x TmO 2 and moisture-air usually produces cracks 25 , electrical insulation species 26 , and hydration phases 27 , which result in a shorter lifetime and poorer rate capability of the exposed layered oxides 28 – 30 .…”

Section: Introductionmentioning

confidence: 99%

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The stability of P2-layered sodium transition metal oxides in ambient atmospheres

et al. 2020

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Air-stability is one of the most important considerations for the practical application of electrode materials in energy-harvesting/storage devices, ranging from solar cells to rechargeable batteries. The promising P2-layered sodium transition metal oxides (P2-Na x TmO 2 ) often suffer from structural/chemical transformations when contacted with moist air. However, these elaborate transitions and the evaluation rules towards air-stable P2-Na x TmO 2 have not yet been clearly elucidated. Herein, taking P2-Na 0.67 MnO 2 and P2-Na 0.67 Ni 0.33 Mn 0.67 O 2 as key examples, we unveil the comprehensive structural/chemical degradation mechanisms of P2-Na x TmO 2 in different ambient atmospheres by using various microscopic/spectroscopic characterizations and first-principle calculations. The extent of bulk structural/chemical transformation of P2-Na x TmO 2 is determined by the amount of extracted Na + , which is mainly compensated by Na + /H + exchange. By expanding our study to a series of Mn-based oxides, we reveal that the air-stability of P2-Na x TmO 2 is highly related to their oxidation features in the first charge process and further propose a practical evaluating rule associated with redox couples for air-stable Na x TmO 2 cathodes.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 87%

“…The pristine Na x TmO 2 cathodes have been synthesized by high-temperature solid-state reactions 12 , 23 . Stoichiometric amounts of raw materials, e.g.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The stability of P2-layered sodium transition metal oxides in ambient atmospheres

et al. 2020

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“…This approach differs from the one used so far, in which the Jahn-Teller Mn 3 + ions are replaced by electrochemically inactive ions such as Zn 2 + in order to enhance the structural stability and electrode performance. [28] The chemical composition, crystalline structure, cationic distribution, and the oxidation states of the TM ions and the thermal properties of Mg-substituted oxides Na 2/3 Ni 1/2-x Mg x Mn 1/2 O 2 are analyzed via complementary diffraction and spectroscopic methods. The sodium intercalation capacity of P3-Na 2/3 Ni 1/2-x Mg x Mn 1/2 O 2 is determined using galvanostatic measurements in half-sodium cells with two types of sodium electrolytes: conventional carbonate-based electrolyte and ionic liquid electrolyte (IL).…”

Section: Introductionmentioning

confidence: 99%

Controlling at Elevated Temperature the Sodium Intercalation Capacity and Rate Capability of P3‐Na_2/3Ni_1/2Mn_1/2O₂ through the Selective Substitution of Nickel with Magnesium

Kalapsazova

Марков

Kostov

et al. 2020

Batteries & Supercaps

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The integration of sodium-ion batteries into large-scale energy storage systems will become feasible in the case when their performance becomes less sensitive towards ambient temperature. Herein, we demonstrate the elaboration of the oxidebased electrode material with an optimized layered structure and composition that is designed to work at elevated temperatures. Through selective substitution of Mg 2 + ions for Ni 2 + in the three-layered oxide, P3-Na 2/3 Ni 1/2 Mn 1/2 O 2 , the oxidation state of Ni ions, the cationic distribution in the layers, the sodium intercalation capacity, and the rate capability is manipulated.

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Lithium‐Substituted Tunnel/Spinel Heterostructured Cathode Material for High‐Performance Sodium‐Ion Batteries

Liang

Kim

Jung

et al. 2020

Adv Funct Materials

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Sodium manganese oxides as promising cathode materials for sodium‐ion batteries (SIBs) have attracted interest owing to their abundant resources and potential low cost. However, their practical application is hindered due to the manganese disproportionation associated with Mn3+, resulting in rapid capacity decline and poor rate capability. Herein, a Li‐substituted, tunnel/spinel heterostructured cathode is successfully synthesized for addressing these limitations. The Li dopant acts as a pillar inhibiting unfavorable multiphase transformation, improving the structural reversibility, and sodium storage performance of the cathode. Meanwhile, the tunnel/spinel heterostructure provides 3D Na+ diffusion channels to effectively enhance the redox reaction kinetics. The optimized [Na0.396Li0.044][Mn0.97Li0.03]O2 composite delivers an excellent rate performance with a reversible capacity of 97.0 mA h g–1 at 15 C, corresponding to 82.5% of the capacity at 0.1 C, and a promising cycling stability over 1200 cycles with remarkable capacity retention of 81.0% at 10 C. Moreover, by combining with hard carbon anodes, the full cell demonstrates a high specific capacity and favorable cyclability. After 200 cycles, the cell provides 105.0 mA h g–1 at 1 C, demonstrating the potential of the cathode for practical applications. This strategy might apply to other sodium‐deficient cathode materials and inform their strategic design.

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Highly-stable P2–Na0.67MnO2 electrode enabled by lattice tailoring and surface engineering

Cited by 115 publications

References 47 publications

The stability of P2-layered sodium transition metal oxides in ambient atmospheres

The stability of P2-layered sodium transition metal oxides in ambient atmospheres

Controlling at Elevated Temperature the Sodium Intercalation Capacity and Rate Capability of P3‐Na_2/3Ni_1/2Mn_1/2O₂ through the Selective Substitution of Nickel with Magnesium

Lithium‐Substituted Tunnel/Spinel Heterostructured Cathode Material for High‐Performance Sodium‐Ion Batteries

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Highly-stable P2–Na0.67MnO2 electrode enabled by lattice tailoring and surface engineering

Cited by 115 publications

References 47 publications

The stability of P2-layered sodium transition metal oxides in ambient atmospheres

The stability of P2-layered sodium transition metal oxides in ambient atmospheres

Controlling at Elevated Temperature the Sodium Intercalation Capacity and Rate Capability of P3‐Na2/3Ni1/2Mn1/2O2 through the Selective Substitution of Nickel with Magnesium

Lithium‐Substituted Tunnel/Spinel Heterostructured Cathode Material for High‐Performance Sodium‐Ion Batteries

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Product

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Controlling at Elevated Temperature the Sodium Intercalation Capacity and Rate Capability of P3‐Na_2/3Ni_1/2Mn_1/2O₂ through the Selective Substitution of Nickel with Magnesium