Designing water/air-stable P2-layered cathodes with delayed P2–O2 phase transition by composition and structure engineering for sodium-ion batteries at high voltage

Zhou, Pengfei; Che, Zhennan; Ma, Fanteng; Zhang, Jing; Weng, Junying; Wu, Xiaozhong; Miao, Zhichao; Zhou, Jin; Zhuo, Shuping

doi:10.1016/j.cej.2020.127667

Cited by 33 publications

(24 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The obtained large capacity and high voltage of the full cell at high rates ensure that an energy density of ≈165 Wh kg −1 can be maintained even at 10 C in Figure 7f (corresponding to state‐of‐the‐art power density of ≈1650 W kg −1 ). The energy density and power density of this P2‐NaNCMO//hard carbon are compared with those previously reported in literatures, [ 55–64 ] as shown in Figure 7g and Table S2, Supporting Information. This P2‐NaNCMO//hard carbon full cell shows a higher energy density and a higher power density.…”

Section: Resultsmentioning

confidence: 76%

Boosting the Redox Kinetics of High‐Voltage P2‐Type Cathode by Radially Oriented {010} Exposed Nanoplates for High‐Power Sodium‐Ion Batteries

Fan

Hou

et al. 2021

Small Structures

View full text Add to dashboard Cite

High‐voltage P2‐type cathode with large capacity, high air stability, and low cost has attracted extensive attention. However, large ionic radius of Na+ and Na+/vacancy ordering result in low reaction kinetics and poor high‐rate capability. Herein, cobalt‐doped hierarchical structure assembled by radially oriented {010} exposed nanoplates is developed. With radially oriented grains infiltrating from surface to interior, all the {010} exposed surfaces are electrochemically active planes, and Na+ ions diffuse directly into electrolyte without passing through grain boundaries, building up 3D transfer channels. The trivalent cobalt substitution suppresses unwanted Na+/vacancy ordering and increases energy barrier of the phase transition from P2‐ to O2‐type oxide. These synergetic effects remarkably boost the redox kinetics of high‐voltage P2‐type cathode. Consequently, a large reversible capacity of 112 mAh g−1 is achieved even at 20 C, indicating excellent high‐rate capability. The absence of P2–O2 phase transition also gives rise to superior cycling stability, maintaining a capacity retention of 85% after 200 cycles. In addition, full cells composed of this hierarchical P2‐type cathode and hard carbon anode deliver high energy‐ and power‐densities. These achievements offer a new insight into boosting redox kinetics of P2‐ and O3‐type layered cathodes for high‐power sodium‐ion batteries.

show abstract

Section: Resultsmentioning

confidence: 76%

Boosting the Redox Kinetics of High‐Voltage P2‐Type Cathode by Radially Oriented {010} Exposed Nanoplates for High‐Power Sodium‐Ion Batteries

Fan

Hou

et al. 2021

Small Structures

View full text Add to dashboard Cite

show abstract

“…XPS was used to analyze the composition of the material and the electronic state of the elements on the sample surface. 37 The full spectrum of undoped Na 0.67 Ni 0.33 Mn 0.67 O 2 and Mg 2+ - 3. Figure 3a shows the peaks at ∼1070, ∼1302.6, ∼855, ∼645, and ∼530 eV belong to Na, Mg, Ni, Mn, and O elements, respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…XPS was used to analyze the composition of the material and the electronic state of the elements on the sample surface . The full spectrum of undoped Na 0.67 Ni 0.33 Mn 0.67 O 2 and Mg 2+ -doped Na 0.67 Ni 0.18 Mg 0.15 Mn 0.67 O 2 and Mn 2p, Ni 2p, and Mg 1s spectra are shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Stable Electrochemical Properties of Magnesium-Doped Co-Free Layered P2-Type Na_0.67Ni_0.33Mn_0.67O₂ Cathode Material for Sodium Ion Batteries

Feng

Luo

Wang

et al. 2022

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

P2-type layered structure manganese-based materials have been reported as the most promising candidate for practical applications of sodium ion batteries because of their high capacity, facile fabrication, low cost, and environmental friendliness. In this work, a novel Cobalt-free layered P2-type Na 0.67 Ni 0.33 Mn 0.67 O 2 cathode material was designed using cation potential, and the cathode material was successfully synthesized by solid-state reaction method. We present an in-depth investigation of the effect of Mg doping on the electrochemical performance and structural stability of Na 0.67 Ni 0.33 Mn 0.67 O 2 by comparing series compositions Na 0.67 Ni 0.33−x Mg x Mn 0.67 O 2 (x = 0, 0.05, 0.1, 0.15, 0.2). The Mgdoping sample Na 0.67 Ni 0.18 Mg 0.15 Mn 0.67 O 2 delivered an initial discharge capacity of 123 mAh•g −1 at 0.1 C in the potential range from 2.0 to 4.3 V. The capacity of the material remained at 92% after 100 cycles at a rate of 0.1 C. Mg ion as an electrochemical inert element can effectively reduce interlayer slip, inhibit phase transition, and stabilize the layered structure. KEYWORDS: Sodium ion batteries, Cathode materials, Na 0.67 Ni 0.33−x Mn 0.67 Mg x O 2 , Manganese substitution, Solid-state reaction method

show abstract

“…[ 13 ] Also, FeAl‐NMO has slight bigger lattice parameters ( a = b = 2.88499 Å, c = 11.27104 Å) than that of NMO sample ( a = b = 2.88038 Å, c = 11.18234 Å). It is generally accepted that the bond length between transition metals and oxygen atoms order the parameter a , [ 16 ] thus the various ionic radii of Fe 3+ (0.645 Å) and Al 3+ (0.535 Å) compared with these values of Mn 3+ (0.645 Å) and Mn 4+ (0.53 Å) account for the variation of a . Meantime, the increase of c is related to the enhancement in electrostatic repulsion between oxygen atoms.…”

Section: Resultsmentioning

confidence: 99%

Dual‐Function of Cation‐Doping to Activate Cationic and Anionic Redox in a Mn‐Based Sodium‐Layered Oxide Cathode

Zhao

Yuan

et al. 2022

Small

View full text Add to dashboard Cite

Recently, sodium‐ion batteries have shown great potential for energy storage owing to their favorable electrochemical properties and intrinsic cost performance, which fuels the research and development of Mn‐based layered oxides as promising sodium‐ion cathodes. However, the undesirable structural evolution and oxygen redox impose great challenge on the cycling stability and rate capability of such cathodes. In this work, it is reported that Fe and Al can effectively tailor the Na2/3Mn2/3Fe1/6Al1/6O2 to trigger a stable cationic and anionic redox behavior. In situ X‐ray diffraction analysis confirms the retention of a stable P2 phase upon cycling, and density functional theory results demonstrate that Al3+ doping can strengthen the covalency of MnO bond. The Na2/3Mn2/3Fe1/6Al1/6O2 cathode can retain 90% of its initial capacity within the voltage range of 2.0–4.2 V versus Na+/Na at 200 mA g‐1 after 100 cycles. Moreover, ex situ X‐ray photoelectron spectroscopy reveals that the specific capacity can be replenished by the synergistic reactions between Fe3+/Fe4+/Fe3+ and O2‐/(O2)n‐ pairs within the voltage range of 4.0–4.4 V versus Na+/Na, which is also elucidated by theoretical calculation.

show abstract

Designing water/air-stable P2-layered cathodes with delayed P2–O2 phase transition by composition and structure engineering for sodium-ion batteries at high voltage

Cited by 33 publications

References 47 publications

Boosting the Redox Kinetics of High‐Voltage P2‐Type Cathode by Radially Oriented {010} Exposed Nanoplates for High‐Power Sodium‐Ion Batteries

Boosting the Redox Kinetics of High‐Voltage P2‐Type Cathode by Radially Oriented {010} Exposed Nanoplates for High‐Power Sodium‐Ion Batteries

Stable Electrochemical Properties of Magnesium-Doped Co-Free Layered P2-Type Na_0.67Ni_0.33Mn_0.67O₂ Cathode Material for Sodium Ion Batteries

Dual‐Function of Cation‐Doping to Activate Cationic and Anionic Redox in a Mn‐Based Sodium‐Layered Oxide Cathode

Contact Info

Product

Resources

About

Designing water/air-stable P2-layered cathodes with delayed P2–O2 phase transition by composition and structure engineering for sodium-ion batteries at high voltage

Cited by 33 publications

References 47 publications

Boosting the Redox Kinetics of High‐Voltage P2‐Type Cathode by Radially Oriented {010} Exposed Nanoplates for High‐Power Sodium‐Ion Batteries

Boosting the Redox Kinetics of High‐Voltage P2‐Type Cathode by Radially Oriented {010} Exposed Nanoplates for High‐Power Sodium‐Ion Batteries

Stable Electrochemical Properties of Magnesium-Doped Co-Free Layered P2-Type Na0.67Ni0.33Mn0.67O2 Cathode Material for Sodium Ion Batteries

Dual‐Function of Cation‐Doping to Activate Cationic and Anionic Redox in a Mn‐Based Sodium‐Layered Oxide Cathode

Contact Info

Product

Resources

About

Stable Electrochemical Properties of Magnesium-Doped Co-Free Layered P2-Type Na_0.67Ni_0.33Mn_0.67O₂ Cathode Material for Sodium Ion Batteries