Na
            <sup>+</sup>
            /vacancy disordering promises high-rate Na-ion batteries

Wang, Peng Fei; Yao, Hu‐Rong; Liu, Xinyu; Yin, Ya‐Xia; Zhang, Jie-Nan; Wen, Yuren; Yu, Xiqian; Gu, Lin; Guo, Yu‐Guo

doi:10.1126/sciadv.aar6018

Cited by 406 publications

(289 citation statements)

References 54 publications

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“…Such anomalies have also been observed in transition metal oxide cathodes [12,13], where they have been modeled by both lattice gas [13][14][15] and first-principles methods [16][17][18]. Ordering of intercalants impacts battery performance by disrupting ionic mobility, and there is evidence that suppressing ordering can improve charging rates [19].…”

Section: Introductionmentioning

confidence: 97%

Reciprocal space imaging of ionic correlations in intercalation compounds

et al. 2019

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The intercalation of alkali ions into layered materials has played an essential role in battery technology since the development of the first lithium-ion electrodes. Coulomb repulsion between the intercalants leads to ordering of the intercalant sublattice, which hinders ionic diffusion and impacts battery performance. While conventional diffraction can identify the long-range order that can occur at discrete intercalant concentrations during the charging cycle, it cannot determine short-range order at other concentrations that also disrupt ionic mobility. In this article, we show that the use of real-space transforms of single crystal diffuse scattering, measured with high-energy synchrotron x-rays, allows a model-independent measurement of the temperature dependence of the length scale of ionic correlations along each of the crystallographic axes in a sodium-intercalated V2O5. The techniques described here provide a new way of probing the evolution of structural ordering in crystalline materials.

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Section: Introductionmentioning

confidence: 97%

Reciprocal space imaging of ionic correlations in intercalation compounds

et al. 2019

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“…Furthermore, the Ti 2 Nb 2 O 9 nanosheet electrode delivers an outstanding capacity retention of 86% even after 500 cycles with a high Coulombic efficiency (CE) of >99% at a current density of 800 mA g −1 (Figure d). The capacity loss might be ascribed to side reactions occurring between electrode materials and electrolyte during cycling . The electrochemical performance of H x TiNbO 5 calcined at 300 °C and bulk Ti 2 Nb 2 O 9 electrode were also evaluated.…”

mentioning

confidence: 99%

Ultrathin Ti₂Nb₂O₉ Nanosheets with Pseudocapacitive Properties as Superior Anode for Sodium‐Ion Batteries

et al. 2018

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Sodium‐ion batteries are emerging as promising candidates for grid energy storage because of the abundant sodium resources and low cost. However, the identification and development of suitable anode materials is far from being satisfactory. Here, it is demonstrated that the Ti2Nb2O9 nanosheets with tunnel structure can be used as suitable anode materials for sodium‐ion batteries. Ti2Nb2O9 nanosheets are synthesized by liquid exfoliation combined with topotactic dehydration, delivering a high reversible capacity of 250 mAh g−1 at 50 mA g−1 at a suitable average voltage of ≈0.7 V. It is found that a low energy diffusion barrier, enlarged interlayer spacing, and exceptional nanoporosity together give rise to high rate performance characterized by pseudocapacitive behavior. The observed high reversible capacity, excellent rate capability, and good cyclability of Ti2Nb2O9 nanosheets make this material competitive when compared to other sodium insertion anode materials.

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“…Recently, sodium-ion batteries (SIBs) have been widely investigated as a new kind of energy storage system due to the similar working principle with LIBs, safety and low cost [7][8][9][10][11][12][13][14][15][16][17]. Cathode materials with an excellent operating voltage and high specific capacity are crucial for the successful development of high energy density SIBs [18][19][20][21][22]. Among most cathode materials for SIBs [23][24][25][26][27][28][29], P2-type Mn/Ni-based binary metal oxide material is considered as one of the most promising candidates due to its high operating potential (Ni 2+/4+ redox reaction), but its practical application is impeded by the low specific capacity and poor cycling stability [20][21][22][23][24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Novel layered K0.7Mn0.7Ni0.3O2 cathode material with enlarged diffusion channels for high energy density sodium-ion batteries

et al. 2020

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As promising, low-cost alternatives of lithiumion batteries for large-scale electric energy storage, sodiumion batteries (SIBs) have been studied by many researchers. However, the relatively large size of Na + leads to sluggish diffusion kinetics and poor cycling stability in most cathode materials, restricting their further applications. In this work, we demonstrated a novel K +-intercalated Mn/Ni-based layered oxide material (K 0.7 Mn 0.7 Ni 0.3 O 2 , denoted as KMNO) with stabilized and enlarged diffusion channels for high energy density SIBs. A spontaneous ion exchange behavior in forming K 0.1 Na 0.7 Mn 0.7 Ni 0.3 O 2 between the KMNO electrode and the sodium ion electrolyte was clearly revealed by in situ X-ray diffraction and ex situ inductively coupled plasma analysis. The interlayer space varied from 6.90 to 5.76 Å, larger than that of Na 0.7 Mn 0.7 Ni 0.3 O 2 (5.63 Å). The enlarged ionic diffusion channels can effectively increase the ionic diffusion coefficient and simultaneously provide more K + storage sites in the product framework. As a proof-of-concept application, the SIBs with the as-prepared KMNO as a cathode display a high reversible discharge capacity (161.8 mA h g −1 at 0.1 A g −1), high energy density (459 W h kg −1) and superior rate capability of 71.1 mA h g −1 at 5 A g −1. Our work demonstrates that the K + pre-intercalation strategy endows the layered metal oxides with excellent sodium storage performance, which provides new directions for the design of cathode materials for various batteries.

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Na ⁺ /vacancy disordering promises high-rate Na-ion batteries

Abstract: We demonstrate that Na+/vacancy disordering of P2-type layered cathodes ensures both fast Na mobility and a low Na diffusion barrier.

Cited by 406 publications

References 54 publications

Reciprocal space imaging of ionic correlations in intercalation compounds

Reciprocal space imaging of ionic correlations in intercalation compounds

Ultrathin Ti₂Nb₂O₉ Nanosheets with Pseudocapacitive Properties as Superior Anode for Sodium‐Ion Batteries

Novel layered K0.7Mn0.7Ni0.3O2 cathode material with enlarged diffusion channels for high energy density sodium-ion batteries

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Na + /vacancy disordering promises high-rate Na-ion batteries

Abstract: We demonstrate that Na+/vacancy disordering of P2-type layered cathodes ensures both fast Na mobility and a low Na diffusion barrier.

Cited by 406 publications

References 54 publications

Reciprocal space imaging of ionic correlations in intercalation compounds

Reciprocal space imaging of ionic correlations in intercalation compounds

Ultrathin Ti2Nb2O9 Nanosheets with Pseudocapacitive Properties as Superior Anode for Sodium‐Ion Batteries

Novel layered K0.7Mn0.7Ni0.3O2 cathode material with enlarged diffusion channels for high energy density sodium-ion batteries

Contact Info

Product

Resources

About

Na ⁺ /vacancy disordering promises high-rate Na-ion batteries

Ultrathin Ti₂Nb₂O₉ Nanosheets with Pseudocapacitive Properties as Superior Anode for Sodium‐Ion Batteries