Interfacial oxygen coordination environment regulation towards high-performance Li-rich layered oxide cathode

Li, Saichao; Liu, Yuanyuan; Zhang, Yinggan; He, Wei; Zheng, Hongfei; Guo, Weibin; Wu, Hualong; Gao, Guiyang; Sa, Biswanath; Wang, Laisen; Xie, Qingshui; Lin, Jie; Shi, Ji; Peng, Dong‐Liang

doi:10.1016/j.cej.2023.142194

“…The clear lattice fringes demonstrate the well-layered structure and crystallinity. The lattice spacing of 0.46 nm conforms to the (003) lattice plane of R-3m phase or the (001) lattice plane of C2/m phase. − In addition, the Fast Fourier Transform (FFT) also demonstrates the typical diffraction plots of the (003) plane . Both the R-LR and S-LR materials also show clear lattice fringe of 0.468 and 0.466 nm, respectively.…”

Section: Resultsmentioning

confidence: 89%

“…31−33 In addition, the Fast Fourier Transform (FFT) also demonstrates the typical diffraction plots of the (003) plane. 34 Both the R-LR and S-LR materials also show clear lattice fringe of 0.468 and 0.466 nm, respectively. The increase in lattice spacing of the (003) plane for R-LR and S-LR materials in comparison with F-LR materials are consistent with the left shift of (003) peaks in the XRD pattern.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

Facile Morphology Modulation to Enhance Stability and Fast Kinetics of Anionic Redox for Li-Rich Layered Oxides Cathodes

Zhang,

Guo,

Gao

et al. 2024

ACS Appl. Energy Mater.

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Li-rich layered oxide cathodes (LLOs) have been regarded as promising high-energy-density cathode materials for lithium-ion batteries due to exceptional specific capacity and eco-friendly nature. However, issues such as irreversible oxygen evolution and severe structural degradation have led to low initial Coulombic efficiency (ICE), poor cycling stability, voltage decay, and unfavorable rate performance. In this work, we have systematically manipulated the morphologies and structures of low cobalt-containing LLOs, specifically Li 1.08 Mn 0.54 Ni 0.21 Co 0.07 O 2 , to stabilize anionic redox chemistry and enhance the rapid kinetic performance of LLOs, resulting in optimized electrochemical properties. Electrochemical testing has demonstrated that LLOs with radial shapes exhibit superior performance, achieving a high ICE of 88.74% with reversible discharging capacity of 285.1 mAh/g and excellent capacity retention of 85.35% at 1 C after 100 cycles. Furthermore, even at 5 C, these LLOs maintain a high discharge capacity of 165.8 mAh/g, indicating significantly improved rate performance due to modulation of their morphology and structure. This work provides valuable insight into the design of high-energy-density LLOs via morphology and structure modulation, laying the groundwork for large-scale production of lithium-ion batteries in the near future.

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Constructing Targeted Strong Nb_4d−O_2p−Li_2s Configurations to Obtain Excellent Energy Density and Long Life for Li‐Rich Cathodes

Hu,

Tang,

Zheng

et al. 2024

Angewandte Chemie

0

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The Li‐rich Mn‐based cathode materials (LMRs) deliver excellent energy density and exhibit low cost, which are considered as the most promising cathode materials for the next generation lithium‐ion batteries. However, the irreversible redox reaction of the oxygen atoms directly leads to release oxygen and intensifies phase transformation. Besides, the local stress and strain will be generated due to the unit‐cell volume difference between R‐3m and C2/m phases, which continuously aggravates the collapse of secondary particles. Herein, the strong Nb4d‐O2p‐Li2s configurations at the Li1 sites of the TM‐layer in the C2/m phase and secondary particles with the radial arrangement of refined primary particles are designed to inhibit oxygen release and relieve lattice stress by Nb2O5 treatment. Meanwhile, the preferential growth of the active {010} planes is presented to obtain an excellent transmission rate of Li+. As a result, the designed LMR delivers remarkable electrochemical properties with high discharge capacity and initial coulomb efficiency of 276 mA h g‐1 and 85% at 0.1 C, outstanding cycling retention rate of 81% after 300 cycles. This novel crystal structure combining oxygen coordination regulation and micro‐nano scale design provides inspiration for the design of high‐performance LMRs.

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Constructing Targeted Strong Nb_4d−O_2p−Li_2s Configurations to Obtain Excellent Energy Density and Long Life for Li‐Rich Cathodes

Hu,

Tang,

Zheng

et al. 2024

Angew Chem Int Ed

0

View full text Add to dashboard Cite

The Li‐rich Mn‐based cathode materials (LMRs) deliver excellent energy density and exhibit low cost, which are considered as the most promising cathode materials for the next generation lithium‐ion batteries. However, the irreversible redox reaction of the oxygen atoms directly leads to release oxygen and intensifies phase transformation. Besides, the local stress and strain will be generated due to the unit‐cell volume difference between R‐3m and C2/m phases, which continuously aggravates the collapse of secondary particles. Herein, the strong Nb4d‐O2p‐Li2s configurations at the Li1 sites of the TM‐layer in the C2/m phase and secondary particles with the radial arrangement of refined primary particles are designed to inhibit oxygen release and relieve lattice stress by Nb2O5 treatment. Meanwhile, the preferential growth of the active {010} planes is presented to obtain an excellent transmission rate of Li+. As a result, the designed LMR delivers remarkable electrochemical properties with high discharge capacity and initial coulomb efficiency of 276 mA h g‐1 and 85% at 0.1 C, outstanding cycling retention rate of 81% after 300 cycles. This novel crystal structure combining oxygen coordination regulation and micro‐nano scale design provides inspiration for the design of high‐performance LMRs.

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Interfacial oxygen coordination environment regulation towards high-performance Li-rich layered oxide cathode

Cited by 8 publications

References 56 publications

Facile Morphology Modulation to Enhance Stability and Fast Kinetics of Anionic Redox for Li-Rich Layered Oxides Cathodes

Facile Morphology Modulation to Enhance Stability and Fast Kinetics of Anionic Redox for Li-Rich Layered Oxides Cathodes

Constructing Targeted Strong Nb_4d−O_2p−Li_2s Configurations to Obtain Excellent Energy Density and Long Life for Li‐Rich Cathodes

Constructing Targeted Strong Nb_4d−O_2p−Li_2s Configurations to Obtain Excellent Energy Density and Long Life for Li‐Rich Cathodes

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Interfacial oxygen coordination environment regulation towards high-performance Li-rich layered oxide cathode

Cited by 8 publications

References 56 publications

Facile Morphology Modulation to Enhance Stability and Fast Kinetics of Anionic Redox for Li-Rich Layered Oxides Cathodes

Facile Morphology Modulation to Enhance Stability and Fast Kinetics of Anionic Redox for Li-Rich Layered Oxides Cathodes

Constructing Targeted Strong Nb4d−O2p−Li2s Configurations to Obtain Excellent Energy Density and Long Life for Li‐Rich Cathodes

Constructing Targeted Strong Nb4d−O2p−Li2s Configurations to Obtain Excellent Energy Density and Long Life for Li‐Rich Cathodes

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Constructing Targeted Strong Nb_4d−O_2p−Li_2s Configurations to Obtain Excellent Energy Density and Long Life for Li‐Rich Cathodes

Constructing Targeted Strong Nb_4d−O_2p−Li_2s Configurations to Obtain Excellent Energy Density and Long Life for Li‐Rich Cathodes