Direct evidence for high Na+mobility and high voltage structural processes in P2-Nax[LiyNizMn1−y−z]O2(x, y, z ≤ 1) cathodes from solid-state NMR and DFT calculations

Clément, Raphaële J.; Xu, Jiaxi; Middlemiss, Derek S.; Alvarado, Judith; Ma, Chen; Meng, Ying Shirley; Grey, Clare P.

doi:10.1039/c6ta09601h

Cited by 115 publications

(178 citation statements)

References 61 publications

(157 reference statements)

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“…Similarly, the Zn 2+ doping reduces the degree of distortion of Ni–O octahedra during the charge/discharge processes of Na 0.66 Ni 0.33 Mn 0.66 O 2 while improving the reversibility of the distortion, endowing it with better voltage and capacity retention than Na 0.66 Ni 0.33 Mn 0.66 O 2 (Figure b) . Li substitution is also confirmed to delay the P2–O2 phase transformation that takes place in Na x Ni 1/3 Mn 2/3 O 2 and even greatly improves its air stability . Na x Ni 1/3 Mn 2/3 O 2 is extremely moisture sensitive once charged to 3.7 V, where water molecules can be readily intercalated into the P2 layers.…”

Section: Transition Metal Oxide Cathodes For Sodium Ion Storagementioning

confidence: 87%

Recent Progress of Layered Transition Metal Oxide Cathodes for Sodium‐Ion Batteries

Liu

Chen

et al. 2019

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Sodium‐ion batteries (SIBs) are attracting increasing attention and considered to be a low‐cost complement or an alternative to lithium‐ion batteries (LIBs), especially for large‐scale energy storage. Their application, however, is limited because of the lack of suitable host materials to reversibly intercalate Na+ ions. Layered transition metal oxides (NaxMO2, M = Fe, Mn, Ni, Co, Cr, Ti, V, and their combinations) appear to be promising cathode candidates for SIBs due to their simple structure, ease of synthesis, high operating potential, and feasibility for commercial production. In the present work, the structural evolution, electrochemical performance, and recent progress of NaxMO2 as cathode materials for SIBs are reviewed and summarized. Moreover, the existing drawbacks are discussed and several strategies are proposed to help alleviate these issues. In addition, the exploration of full cells based on NaxMO2 cathodes and future perspectives are discussed to provide guidance for the future commercialization of such systems.

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Section: Transition Metal Oxide Cathodes For Sodium Ion Storagementioning

confidence: 87%

Recent Progress of Layered Transition Metal Oxide Cathodes for Sodium‐Ion Batteries

Liu

Chen

et al. 2019

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“…Thus, Al 3+ ‐doped P2‐Na 0.6 Ni 0.22 Al 0.11 Mn 0.66 O 2 (Figure b) delivered a high specific capacity of ≈250 mA h g −1 and retained 200 mA h g −1 after 50 cycles between 1.5 and 4.6 V (vs. Na/Na + ), as shown in Figure c. [20b]…”

Section: Sodium Ion Batteriesmentioning

confidence: 99%

“…c) Charge/discharge voltage profiles of Na/P2‐Na 0.6 Ni 0.22 Al 0.11 Mn 0.66 O 2 cells at 20 mA g −1 within the range of 4.6–1.5 V. Reproduced with permission. [20b] Copyright 2017, Royal Society of Chemistry.…”

Section: Sodium Ion Batteriesmentioning

confidence: 99%

“…Nevertheless, the P2–O2 phase transition derived from oxygen shift occurs upon charging above 4.22 V (vs. Na/Na + ), leading to inevitable volume changes and final capacity decay . Among the abovementioned cations, the substitution of inactive cations such as Li + and Al 3+ for Ni can generally prevent the extraction of more Na + ions from prismatic sites at high voltages and maintain the overall charge balance, which effectively suppresses the formation of the O2 phase . Thus, Al 3+ ‐doped P2‐Na 0.6 Ni 0.22 Al 0.11 Mn 0.66 O 2 (Figure b) delivered a high specific capacity of ≈250 mA h g −1 and retained 200 mA h g −1 after 50 cycles between 1.5 and 4.6 V (vs. Na/Na + ), as shown in Figure c.…”

Section: Sodium Ion Batteriesmentioning

confidence: 99%

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Micro/Nanostructured Materials for Sodium Ion Batteries and Capacitors

Zhou

2017

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High-efficiency energy storage technologies and devices have received considerable attention due to their ever-increasing demand. Na-related energy storage systems, sodium ion batteries (SIBs) and sodium ion capacitors (SICs), are regarded as promising candidates for large-scale energy storage because of the abundant sources and low cost of sodium. In the last decade, many efforts, including structural and compositional optimization, effective modification of available materials, and design and exploration of new materials, have been made to promote the development of Na-related energy storage systems. In this Review, the latest developments of micro/nanostructured electrode materials for advanced SIBs and SICs, especially the rational design of unique composites with high thermodynamic stabilities and fast kinetics during charge/discharge, are summarized. In addition to the recent achievements, the remaining challenges with respect to fundamental investigations and commercialized applications are discussed in detail. Finally, the prospects of sodium-based energy storage systems are also described.

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“…Therefore, the high structural reversibility and high Na + mobility during cycling explain the overall excellent battery performance for the P2-Na 0.8 Li 0.12 Ni 0.22 Mn 0.66 O 2 cathode. [146] It is worth noting that P2-Na 2/3 [Ni 1/3 Mn 2/3 ]O 2 is stable in moist air due to the Ni/Mn superlattice ordering, which induces a stronger coupling between adjacent TMO 2 sheets and prevents the intercalation of water molecules into the structure. [36] LiNi …”

Section: Ni/mn-based Oxidesmentioning

confidence: 99%

Layered Oxide Cathodes for Sodium‐Ion Batteries: Phase Transition, Air Stability, and Performance

Wang

You

Yin

et al. 2017

Advanced Energy Materials

620

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sources into large-scale grids, inexpensive, efficient, and fast-responding electrical energy storage (EES) systems are essential to store the off-peak energy and releasing the stored energy during the onpeak period. Among various EES systems, rechargeable batteries represent one of the most competitive technologies because of their high conversion efficiency and environmental friendliness. [1][2][3][4] For stationary EES systems, batteries with low cost, high safety, high rate capability, and long cycle stability are highly desired.Lithium (Li)-ion batteries (LIBs) have achieved great success in the market of portable electronics and electric vehicles since their commercialization by Sony Company in 1991. However, the shortage of Li resources in nature gives rise to a concern about its sustainable development in grid scale. Compared with Li, sodium resource has rich natural abundance in the earth crust and a worldwide distribution, consequently leading to a low price of sodium-based raw materials (e.g., the cost of Na 2 CO 3 is about 25-30 times lower than that of Li 2 CO 3 ). Besides, sodium has a suitable redox potential (E 0 (Na + /Na) = −2.71 V versus standard hydrogen electrode (SHE), 0.3 V above that of Li + /Li) and similar physical and chemical properties with lithium. [5,6] Therefore, rechargeable sodium-ion batteries (SIBs), which have a similar "rockingchair" working principle of LIBs, are emerging as an appealing choice as alternatives for LIBs. Note that it is difficult for SIBs to bypass LIBs in terms of energy densities because of the much higher weight of Na and lower standard electrochemical potential. [7][8][9][10] Nevertheless, the use of low-cost materials, including inexpensive Na-based raw materials and Al current collectors for both cathodes and anodes in SIBs, could significantly reduce the cost. In this case, SIBs could be applied where cost-effectiveness rather than energy density is the most critical issue, e.g., in the field of large-scale EES. As a result, sodiumbased electroactive materials are enjoying renewed interest especially for very low cost systems for grid storage. [11,12] Given that cathode materials are the key component that determines energy density and cost, tremendous efforts have been devoted to exploring suitable positive electrode materials with high reversible capacity, rapid Na ions insertion/extraction, and good cycling stability in the past few years. [13,14] A broad range of compounds, including layered oxides, polyanionic frameworks, hexacyanoferrates, and organics, haveThe increasing demand for replacing conventional fossil fuels with clean energy or economical and sustainable energy storage drives better battery research today. Sodium-ion batteries (SIBs) are considered as a promising alternative for grid-scale storage applications due to their similar "rockingchair" sodium storage mechanism to lithium-ion batteries, the natural abundance, and the low cost of Na resources. Searching for appropriate electrode materials with acceptable electrochemical perfor...

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Direct evidence for high Na⁺mobility and high voltage structural processes in P2-Na_x[Li_yNi_zMn_1−y−z]O₂(x, y, z ≤ 1) cathodes from solid-state NMR and DFT calculations

Abstract: 23Na and 7Li NMR on P2-Nax[LiyNizMn1−y−z]O2 sodium-ion battery cathodes provide evidence for fast Na-ion motion and structural stabilization of the Li-substituted materials upon Na electrochemical extraction.

Cited by 115 publications

References 61 publications

Recent Progress of Layered Transition Metal Oxide Cathodes for Sodium‐Ion Batteries

Recent Progress of Layered Transition Metal Oxide Cathodes for Sodium‐Ion Batteries

Micro/Nanostructured Materials for Sodium Ion Batteries and Capacitors

Layered Oxide Cathodes for Sodium‐Ion Batteries: Phase Transition, Air Stability, and Performance

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