Conformal spinel/layered heterostructures of Co3O4 shells grown on single-crystal Li-rich nanoplates for high-performance lithium-ion batteries

Yue, Xin; Lan, Xiwei; Peng, Chang; Huang, Yaqun; Wang, Yunlong; Hu, Xianluo

doi:10.1016/j.apsusc.2018.04.070

Cited by 20 publications

(12 citation statements)

References 54 publications

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“…In addition, we also found that the TiO 2 modified electrodes showed a couple of additional redox peaks at 2.6 and 2.9 V compared to the raw electrode, which is derived from the redox reaction of Mn 3+ in the spinel phase. 33,34 The result is in accordance with the charge and discharge test results, which further reveal the reason why the TO2 represents prominent cycle stability. Figure 5 shows a schematic diagram of the structural evolution of the raw electrode and TO2 electrode materials during cycling.…”

Section: Electrochemical Performancesupporting

confidence: 81%

“…However, it cannot be ignored that the TO2 electrode exhibits a minimum displacement deviation of 0.13 V, which is significantly lower than 0.30 V of the raw electrode, indicating a significant increase in the reversibility of anionic redox chemistry. In addition, we also found that the TiO 2 modified electrodes showed a couple of additional redox peaks at 2.6 and 2.9 V compared to the raw electrode, which is derived from the redox reaction of Mn 3+ in the spinel phase . The result is in accordance with the charge and discharge test results, which further reveal the reason why the TO2 represents prominent cycle stability.…”

Section: Resultsmentioning

confidence: 99%

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Surface homogenizing heterostructure coatings induced by Ti ₃ C ₂ T _x MXene for enhanced cycle performance of lithium‐rich cathode materials

et al. 2020

Int J Energy Res

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Summary The layered lithium‐rich manganese‐based cathode material (Li1.2Mn0.54Co0.13Ni0.13) has the significant advantage of high specific capacity, but this material also suffers serious defects, including severe capacity attenuation and voltage attenuation during the cycle. At present, most researchers have been working to optimize the cycle performance of lithium‐rich materials. In this work, we propose a surface homogenizing heterostructure coating induced by MXene modification to reduce capacity reduction and voltage decay. It can be found that the initial Coulombic efficiency (ICE) increases from 77.2% for the bare electrode Li1.2Mn0.54Co0.13Ni0.13 (LMO) to 85.5% for 1.4 wt% MXene (Ti3C2Tx, Tx represents the surface terminations: OH, O, F) modified lithium‐rich (TO2). Furthermore, the discharge specific capacity of the electrode at 5 C rate increased from 160.7 mAh g−1 for LMO to 200.6 mAh g−1 for TO2. More prominently, the outstanding cycle stability with capacity retention rate is 82.1% for TO2 after 200 cycles, while only 64.7% for LMO, and the average discharge voltage dropped from 0.788 to 0.468 V. In addition, the mechanism for improving the electrochemical performance is systematically studied.

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Section: Electrochemical Performancesupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Surface homogenizing heterostructure coatings induced by Ti ₃ C ₂ T _x MXene for enhanced cycle performance of lithium‐rich cathode materials

et al. 2020

Int J Energy Res

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“…LNMC‐C is substantially similar to LNMC, but a new redox pair is seen at about 2.7–2.9 V, corresponding to the de‐intercalation and intercalation of Li + from the spinel phase. Overall, the overlapping ratio in the CV curves in LNMC‐C is larger than that of LNMC, which indicates that LNMC‐C has a better structural stability than LNMC …”

Section: Resultsmentioning

confidence: 95%

A Layered Lithium‐Rich Li(Li_0.2Ni_0.15Mn_0.55Co_0.1)O₂ Cathode Material: Surface Phase Modification and Enhanced Electrochemical Properties for Lithium‐Ion Batteries

Zhang

Peng

et al. 2019

ChemElectroChem

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Layered lithium-rich oxides are recognized as promising cathode materials for lithium-ion batteries (LIBs), owing to their high-energy density, high voltage, high specific capacity, and low cost. However, it remains a critical challenge to realize the high capacity of layered lithium-rich oxides. Herein, we synthesize the Li-rich Li(Li 0.2 Ni 0.15 Mn 0.55 Co 0.1 )O 2 cathode material by using the sol-gel method and induced a spinel phase on its surface through carbonization-reduction engineering. The surface-modified sample exhibited both improved capacity and rate capabilities. The initial discharge capacity of the treated sample reached 279.6 mAh g À 1 at 0.1 C, which was 11 % higher when compared to the as-prepared sample (252.6 mAh g À 1 ). In addition, a discharge capacity of 239.4 and 235.9 mAh g À 1 after 100 cycles at 0.5 C and 1 C (1 C = 250 mAh g À 1 ) could be still obtained for the modified sample, respectively. The enhanced properties were attributed to the increased ionic conductivity through the formation of 3D diffusion paths and reduced structural transformation, owing to the spinel structure decoration on the surface.

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“…Doping could improve the conductivity of LLO materials, increase their cell parameters, promote Li + migration, and form stronger TM-O (transition metal: TM) bonds to stabilize the structure . Many types of metal oxides have been evaluated as cladding for cathode materials, such as TiO 2 , Al 2 O 3 , MgO, Er 2 O 3 , SnO 2 , CeO 2 , Co 3 O 4 , and so on. − A variety of coating processes/strategies (wet chemical techniques, dry coating processes, and gas-phase chemical processes) were used to improve capacity retention, long-term cycling, thermal stability, and high-temperature stability of LIBs . However, these methods are expensive and difficult to control in thickness, shape, and uniformity.…”

Section: Introductionmentioning

confidence: 99%

Doping and Coating Synergy to Improve the Rate Capability and Cycling Stability of Lithium-Rich Cathode Materials for Lithium-Ion Batteries

Liu

et al. 2022

J. Phys. Chem. C

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Layered lithium-rich oxide (LLO) with high energy density is considered as the cathode material for the next generation of lithium-ion batteries. However, low initial Coulombic efficiency, poor cycling performance, and rate performance have hindered the commercialization of LLO. Herein, we propose an effective one-pot co-precipitation method to improve the rate capability and cycling stability of LLO materials. The addition of Cd 2+ ions in LLO can affect the formation and growth of primary grains, which leads to structural reconstruction phenomena. Finally, the Cd element exists in the LLO material in the form of ion doping and CdO coating. The Cd-modified LLO material shows porous microspheric morphology, large layer spacing, and well crystallization. The role of Cd doping is to improve the electronic conductivity of LLO and increase the electrochemical potential. CdO nanoparticles covered on the surface and dispersed in the interior of the LLO material particles prevent the native material from being corroded by the electrolyte and contribute to the structural stability of the active material during cycling. Under the synergistic effect of these two modification methods, the surface and internal kinetics of the LLO materials are enhanced, their rate performance and cycling stability are improved, and the electrodes exhibit excellent structural stability after cycling. Density functional theory analysis results prove that Cd doping can suppress the structural change during the charging process and possess lower formation energy.

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Conformal spinel/layered heterostructures of Co3O4 shells grown on single-crystal Li-rich nanoplates for high-performance lithium-ion batteries

Cited by 20 publications

References 54 publications

Surface homogenizing heterostructure coatings induced by Ti ₃ C ₂ T _x MXene for enhanced cycle performance of lithium‐rich cathode materials

Surface homogenizing heterostructure coatings induced by Ti ₃ C ₂ T _x MXene for enhanced cycle performance of lithium‐rich cathode materials

A Layered Lithium‐Rich Li(Li_0.2Ni_0.15Mn_0.55Co_0.1)O₂ Cathode Material: Surface Phase Modification and Enhanced Electrochemical Properties for Lithium‐Ion Batteries

Doping and Coating Synergy to Improve the Rate Capability and Cycling Stability of Lithium-Rich Cathode Materials for Lithium-Ion Batteries

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Conformal spinel/layered heterostructures of Co3O4 shells grown on single-crystal Li-rich nanoplates for high-performance lithium-ion batteries

Cited by 20 publications

References 54 publications

Surface homogenizing heterostructure coatings induced by Ti 3 C 2 T x MXene for enhanced cycle performance of lithium‐rich cathode materials

Surface homogenizing heterostructure coatings induced by Ti 3 C 2 T x MXene for enhanced cycle performance of lithium‐rich cathode materials

A Layered Lithium‐Rich Li(Li0.2Ni0.15Mn0.55Co0.1)O2 Cathode Material: Surface Phase Modification and Enhanced Electrochemical Properties for Lithium‐Ion Batteries

Doping and Coating Synergy to Improve the Rate Capability and Cycling Stability of Lithium-Rich Cathode Materials for Lithium-Ion Batteries

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Surface homogenizing heterostructure coatings induced by Ti ₃ C ₂ T _x MXene for enhanced cycle performance of lithium‐rich cathode materials

Surface homogenizing heterostructure coatings induced by Ti ₃ C ₂ T _x MXene for enhanced cycle performance of lithium‐rich cathode materials

A Layered Lithium‐Rich Li(Li_0.2Ni_0.15Mn_0.55Co_0.1)O₂ Cathode Material: Surface Phase Modification and Enhanced Electrochemical Properties for Lithium‐Ion Batteries