Enabling high rate performance of Ni-rich layered oxide cathode by uniform titanium doping

Sun, Hong; Cao, Zhilin; Wang, Tengrui; Lin, Rui; Li, Yuyu; Liu, Xi; Zhang, Lulu; Lin, Feng; Huang, Yunhui; Luo, Wei

doi:10.1016/j.mtener.2019.05.003

Cited by 88 publications

(39 citation statements)

References 49 publications

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“…[ 5a ] The inward dopant diffusion is also consistent with what the literature reported. For example, calcining surface‐coated cathode materials may facilitate the inward diffusion of the coating species (e.g., Zr 4+ , [ 20 ] Ti 4+ , [ 21 ] Ta 5+ , [ 22 ] Na +[ 23 ] ), potentially forming hybrid coating and doping, which is an effective strategy to modify the surface structure of Ni‐rich layered cathodes and thus enhance the cycling stability. [ 24 ] It was predicted through computational methods that different dopants can have varied surface segregation tendencies thermodynamically depending on the surface segregation energy.…”

Section: Resultsmentioning

confidence: 99%

Probing Dopant Redistribution, Phase Propagation, and Local Chemical Changes in the Synthesis of Layered Oxide Battery Cathodes

Yang

Hou

et al. 2020

Advanced Energy Materials

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Achieving the targeted control of layered oxide properties calls for more fundamental studies to mechanistically probe their evolution during their synthesis. Herein, dopant distribution, phase propagation, and local chemical changes as well as their interplay in multielement‐doped LiNiO2 materials are investigated using spectroscopic, imaging, and scattering techniques. It is shown that dopants undergo dynamic redistribution in the Ni(OH)2 host lattice at the early stage of calcination (below 300 °C). Such redistribution behavior exhibits strong dopant‐dependent characteristics, allowing for targeted surface and bulk doping control. The Ni oxidation process exhibits depth‐dependent characteristics and the most rapid Ni oxidation takes place between 300 and 700 °C. Using Ni oxidation state as the proxy for the phase transformation, the buildup of heterogenous phase propagation in the early stage of calcination is shown, especially along the radial direction of secondary particles. The radial heterogenous phase distribution gradually decreases upon completing the calcination. However, a high degree of mosaic‐like heterogeneity may still be present in the final product, departing from the perfect layered oxide. The present study offers fundamental insights into manipulating multiscale materials properties during calcination for obtaining stable, high‐energy layered oxide cathodes.

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Section: Resultsmentioning

confidence: 99%

Probing Dopant Redistribution, Phase Propagation, and Local Chemical Changes in the Synthesis of Layered Oxide Battery Cathodes

Yang

Hou

et al. 2020

Advanced Energy Materials

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“…The delithiation kinetics were further investigated using galvanostatic intermittent titration techniques during the initial charging process (Supporting Information Figure S4a). Comparatively, the steady-state condition can be easily reached for Ca-doped NCM811 during relaxation of the potential (Supporting Information Figure S4b), indicating a higher delithiation kinetics compared with NCM811 and Mg-doped NCM811 . Therefore, the calculated D Li of Ca-doped NCM811 is higher than that of the other three electrodes (Supporting Information Figure S4c).…”

Section: Results and Discussionmentioning

confidence: 96%

Elucidating the Effect of the Dopant Ionic Radius on the Structure and Electrochemical Performance of Ni-Rich Layered Oxides for Lithium-Ion Batteries

Wang

Song

Liu

et al. 2021

ACS Appl. Mater. Interfaces

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The merits of Ni-rich layered oxide cathodes in specific capacity and material cost accelerate their practical applications in electric vehicles and grid energy storage. However, detrimental structural deterioration occurs inevitably during long-term cycling, leading to potential instability and capacity decay of the cathodes. In this work, we investigate the effect of the doped cation radius on the electrochemical performance and structural stability of Ni-rich cathode materials by doping with Mg and Ca ions in LiNi0.8Co0.1Mn0.1O2. The results reveal that an increase in the doping ion radius can enlarge the interlayer spacing but lead to the collapse of the layered structure if the ion radius is too large, which undermines the cycling stability of the cathode material. Compared with the Ca-doped sample and the pristine material, Mg-doped LiNi0.8Co0.1Mn0.1O2 presents improved structural stability and superior thermal stability due to the pillar and glue roles of medium-sized Mg ions in the lithium layer. The results of this study suggest that a suitable ionic radius of the dopant is critical for stabilizing the structure and improving the electrochemical properties of Ni-rich layered oxide cathode materials.

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“…It has electrochemical inert behavior within the electrochemical window. [ 172 ] Due to the appropriate radius and stronger Ti and O bonding, the doping of Ti can decrease the dissolution of transition metal as well as enhance the stability of the structure. The high‐valance Ti doping results in the small amount of conversion of Ni +3 from Ni +2 which favors the improvement in the electrochemical performance.…”

Section: Strategies To Alleviate the Degradation Of Ni‐rich Cathode M...mentioning

confidence: 99%

Recent Advances in Enhanced Performance of Ni‐Rich Cathode Materials for Li‐Ion Batteries: A Review

et al. 2022

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High energy Li‐ion batteries (LIBs) have garnered substantial consideration in recent years for their utilization in many fields like communication, transportation, and aviation. As the cathode is the crucial component of LIBs, so by enhancing its electrochemical performance, the capacity, rate capability, as well as cyclability of batteries can be enhanced. Ni‐rich cathode materials (LiNi x Mn y Co1−x−y O2, x ≥ 0.5) have been accredited for their benefits in enhanced capacity, high working voltage, and low manufacturing cost. The high Ni content is accountable for the exceptional capacity but the utilization in the commercialized LIBs is mired by their electrochemical cycling issues like capacity fading, voltage decay, and safety hazard. To overcome these obstructions, a variety of methodologies have been adopted like doping, coating, and comodification of these cathode materials. An inclusive study of Ni‐rich cathode materials, their degradation mechanism, and the strategies is conferred, which have been employed in recent years to overcome the challenges faced by these materials in their commercialization.

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Enabling high rate performance of Ni-rich layered oxide cathode by uniform titanium doping

Cited by 88 publications

References 49 publications

Probing Dopant Redistribution, Phase Propagation, and Local Chemical Changes in the Synthesis of Layered Oxide Battery Cathodes

Probing Dopant Redistribution, Phase Propagation, and Local Chemical Changes in the Synthesis of Layered Oxide Battery Cathodes

Elucidating the Effect of the Dopant Ionic Radius on the Structure and Electrochemical Performance of Ni-Rich Layered Oxides for Lithium-Ion Batteries

Recent Advances in Enhanced Performance of Ni‐Rich Cathode Materials for Li‐Ion Batteries: A Review

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