Both cationic and anionic redox chemistry in a P2-type sodium layered oxide

Wang, Pengfei; Xiao, Yao; Piao, Nan; Wang, Qin‐Chao; Ji, Xiao; Jin, Tao; Guo, Yujie; Liu, Sufu; Deng, Tao; Cui, Chunyu; Chen, Long; Yang, Xiao‐Qing; Wang, Chunsheng

doi:10.1016/j.nanoen.2020.104474

Cited by 100 publications

(86 citation statements)

References 45 publications

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“…However, the substitution of Li is not necessary to create such O 2p nonbonding orbitals. 29 In fact, similar oxygen redox behavior has also been reported in Mg-substituted samples such as Na I. It is notable that most of the compounds containing Ni do not have reversible oxygen redox.…”

supporting

confidence: 59%

The Negative Impact of Transition Metal Migration on Oxygen Redox Activity of Layered Cathode Materials for Na-Ion Batteries

Hirsh

Cheng

et al. 2021

J. Electrochem. Soc.

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Rechargeable sodium ion batteries with high energy density are a promising technology to address the demand for grid storage. Cathode materials with oxygen redox activity exhibit higher energy density than expected from Na-ion removal and charge compensation solely by transition metal redox. One strategy to enable oxygen redox in materials is to alter the oxygen environment through transition metal layer ordering. In this work, we report the investigation of oxygen redox activity induced by transition metal ordering in P2-type Na 0.8 Li 0.12 Ni 0.22 Mn 0.66 O 2 cathode synthesized by carbonate co-precipitation. Irreversible oxygen activity was observed and correlated with Ni migration that resulted in the loss of transition metal ordering in the structure. Calculated density of states shows that after Ni migration, the number of unoccupied states of O above Fermi level decreases, inhibiting the reduction of oxygen during sodiation. This paper provides insights on how Ni migration has a detrimental effect on transition metal ordering and reversibility of oxygen redox at high voltage.

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supporting

confidence: 59%

The Negative Impact of Transition Metal Migration on Oxygen Redox Activity of Layered Cathode Materials for Na-Ion Batteries

Hirsh

Cheng

et al. 2021

J. Electrochem. Soc.

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“…[22] For SIBs, the anionic redox reaction is available for not only Na-rich materials but also Na-deficient P2/P3-type compounds. [23][24][25][26][27][28][29][30][31][32][33][34][35] For example, manganese-based P2-type sodiumdeficient materials with low-valence substituents, such as Li, [26,30,31] Zn, [23,29] and Mg, [27,28] have demonstrated oxygenredox activity with good structural stability. It is generally accepted that a NaOA (A = Li, Na, Mg, Zn, or vacancy) local coordination environment is the essential requirement for oxygen redox activation in P2/O3 type layered Na x [ATM] O 2 (TM: transition metals).…”

Section: Introductionmentioning

confidence: 99%

“…Migration of those Li and Na in the transition metal layers toward Na layers induces formation of lone pair electrons in O 2p orbital, such that the high density of state energy for oxygen allows oxidation of oxygen although the reaction occurs kinetically sluggish. Recent progress has enabled the sluggish kinetics of oxygen-redox and low energy density caused by the low voltage of the Mn 4+ / Mn 3+ redox couple to be circumvented; specifically, covalence between O 2p and Cu 3d, [32,33] Ni 3d, [24] or Co 3d [25,35] substantially promotes facile electron transfer and increases in operation voltage and provides reversibility of the oxygen-redox reaction, proved in sodium-deficient P2-type Na 2/3 [Ni 1/3 Mn 2/3 ] O 2 [36] and Na 2/3 [Cu 0.28 Mn 0.72 ]O 2 [37] without such NaOA local configuration. Density functional theory (DFT) calculation and mapping of resonant inelastic X-ray scattering (mRIXS) demonstrated that the reversible oxygen redox could take place due to a higher covalence of NiO and CuO bonds at highest desodiated states, which leads to the energy of O 2p in e g * (NiO/ CuO) becomes higher than that of Ni 3d/Cu 3d, which, therefore, facilitates the oxygen redox reaction.…”

Section: Introductionmentioning

confidence: 99%

A New Approach to Stable Cationic and Anionic Redox Activity in O3‐Layered Cathode for Sodium‐Ion Batteries

Voronina

Yaqoob

Kim

et al. 2021

Advanced Energy Materials

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“…The good full‐cell electrochemistry performance further demonstrates the practicability of the HC anode material. [ 67,68 ]…”

Section: Resultsmentioning

confidence: 99%

A Stable Biomass‐Derived Hard Carbon Anode for High‐Performance Sodium‐Ion Full Battery

Xiao

Ling

et al. 2020

Energy Tech

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As the environmental and energy crisis aggravated, it is urgent to develop a clean and recyclable energy storage system. [1-5] In recent years, sodium-ion batteries (SIBs) have become a research hotspot in energy field because of its rich sodium content and low cost. [6-9] Designing low cost and advanced electrode materials are the key to drive their future commercialization. [10-14] Presently, a large variety of cathode materials have been proposed, such as transition metal oxides, polyanionic-type compounds, Prussian blue analogues, and organic-based materials. [15-22] In the case of anode materials, the research also presents the rapid development trend. Carbon-based material, alloys, transition metal oxides/sulfides and organic compounds have been widely studied as promising anodes for SIBs. [23-28] Among these materials, alloys, transition metal oxides/ sulfides, and organic compounds suffered from large volume expansion and poor electrochemical kinetics. As a contrast, biomass-derived hard carbon (HC), one of the most suitable materials for practical application, has attracted more and more attentions as a kind of resource abundant, high conductivity, low cost, and environmentally friendly material. [29-32] Recently, researchers synthesized HC materials derived from biomasses and explored their applications in energy storage. HC products have been synthesized from a variety of carbon sources, such as cellulose, peat moss, peanut shells, banana peels, renewable cotton, and poplar wood. [33-38] Compared with other crop straws, bagasse is the major waste of the sugar industry that contained more lignification, cellulose and hemicellulose, less protein, starch and soluble sugar, and lower pesticide residues. [39] Meanwhile, it is a carbon-rich biomass that can be used to prepare functional carbonaceous nanomaterials by thermal decomposition, turning waste into valuable materials. [40,41] However, in the previously reported work, the poor cycling stability of HC anode material is still a big

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Both cationic and anionic redox chemistry in a P2-type sodium layered oxide

Cited by 100 publications

References 45 publications

The Negative Impact of Transition Metal Migration on Oxygen Redox Activity of Layered Cathode Materials for Na-Ion Batteries

The Negative Impact of Transition Metal Migration on Oxygen Redox Activity of Layered Cathode Materials for Na-Ion Batteries

A New Approach to Stable Cationic and Anionic Redox Activity in O3‐Layered Cathode for Sodium‐Ion Batteries

A Stable Biomass‐Derived Hard Carbon Anode for High‐Performance Sodium‐Ion Full Battery

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