Ca-doped Na x CoO 2 for improved cyclability in sodium ion batteries

Han, Su Cheol; Lim, Heatsal; Jeong, Jaehyang; Ahn, Docheon; Park, Woon Bae; Sohn, Kee‐Sun; Pyo, Myoungho

doi:10.1016/j.jpowsour.2014.11.150

Cited by 91 publications

(62 citation statements)

References 41 publications

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“…[57] Ti-doped material effectively inhibits the glide of transition metal layer upon sodiation/desodiation and exhibits only a highly reversible phase transition from O3 to P3 (Figure 5d), with a dramatic comparison to the four phase transitions of original NaNi 0.5 Mn 0.5 O 2 . Similar effect has also been exhibited in Cu-doped Na 0.67 Ni 0.1 Cu 0.2 Mn 0.7 O 2 , [59] Ca-doped Na 5/8 Ca 1/24 CoO 2 , [60,61] Li and Fe co-doped Na [Li 0.05 (Ni 0.25 Fe 0.25 Mn 0.5 ) 0.95 ]O 2 . [62] Another major role of element doping in layered oxides cathode materials is to modulate the interlayer spacing and suppress Na + /vacancy ordering.…”

Section: Element Dopingsupporting

confidence: 73%

Strategies to Build High‐Rate Cathode Materials for Na‐Ion Batteries

Huang

Yin

et al. 2019

ChemNanoMat

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The development of cathode materials for Na‐ion batteries (NIBs) has benefitted greatly from previous research on Li‐ion batteries (LIBs) due to the similar physicochemical properties between Na and Li. However, the exploitation of high‐rate NIB cathodes has faced greater difficulty compared to the Li counterparts because of the larger ionic radius of Na. Numerous attempts to optimize the composition and structure have been made to address this issue, and great progress has been achieved in recent years. Herein, a systemic review on the latest research in high‐rate cathode materials for NIBs is presented. In addition, a comprehensive analysis on specific reasons hindering the kinetic performance is also discussed, which is expected to deepen the understanding of the mechanisms behind rate performance and provides a new avenue for the design of high‐performance NIBs.

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Section: Element Dopingsupporting

confidence: 73%

Strategies to Build High‐Rate Cathode Materials for Na‐Ion Batteries

Huang

Yin

et al. 2019

ChemNanoMat

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“…Hence, we can see the direct correlation between the Cu dopant concentration and increased mobility. This interesting phenomenon nonetheless needs to be further investigated by direct experimental probes as it is important not only to the thermoelectric applications but also to the rechargeable Na ion batteries [34].…”

Section: Resultsmentioning

confidence: 99%

Restoration of long range order of Na ions in NaxCoO2 at high temperatures by sodium site doping

Assadi

Katayama‐Yoshida

2015

Computational Materials Science

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a b s t r a c tWe have systematically investigated the Na x CoO 2 system doped with Cu, Y, Sn, W, Au and Bi for x = 0.5, 0.75 and 1.00 using density functional theory. Sn, W and Bi always substitute a Co while Au always substitute a Na regardless of Na concentration. However, for, Cu and Y, the substitution site depends on Na concentration. When compared to the available experimental data, we find that thermoelectric performance is enhanced when the dopants substitute a Na site. In this case, surprisingly, resistivity decreases despite the reduced hole concentration caused by carrier recombination. We propose improved carrier mobility to be the cause of observed reduced resistivity.

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“…Recently, Ca-doped Na 5/8 Ca 1/24 CoO 2 could suppress phase separation occurring in P2-type Na x CoO 2 , resulting in an improved cycling performance. [85,86] However, the large Ca 2+ ions occupy the Na layers, which would seriously hinder the transportation of Na + during cycling. In short, it seems impossible that Na x CoO 2 can be comparable to LiCoO 2 in LIBs.…”

Section: Mostly Studied Single-metal-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

660

464

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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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Ca-doped Na x CoO 2 for improved cyclability in sodium ion batteries

Cited by 91 publications

References 41 publications

Strategies to Build High‐Rate Cathode Materials for Na‐Ion Batteries

Strategies to Build High‐Rate Cathode Materials for Na‐Ion Batteries

Restoration of long range order of Na ions in NaxCoO2 at high temperatures by sodium site doping

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

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