Significant role of “burned” graphene in determining the morphology of LiNiO2 prepared under the air conditions

Ding, Keqiang; Zhao, Yongbo; Liu, Likun; Li, Yuan; Liu, Lu; Wang, Li; He, Xiangming; Guo, Zhanhu

doi:10.1016/j.electacta.2015.07.035

Cited by 24 publications

(1 citation statement)

References 39 publications

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“…Thus, the separation into LiO 2 and MO 2 mode layers could be seen. The band observed around 532 cm -1 was assigned to the asymmetric stretching modes of M-O bonds in MO 6 octahedra and the other band around 608.13 cm -1 was attributed to the O-M-O bending modes [33,34]. The broadening of FTIR bands is due to the cation mixing in the crystal layers.…”

Section: Ftir Studiesmentioning

confidence: 95%

Preparation, dielectric and conductivity studies of LiNi1-xMgxO2 cathode materials for lithium-ion batteries

Murali

Veeraiah

2017

PAC

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A layered structure cathode materials LiNi 1-x Mg x O 2 (where x = 0.0 and 0.02) were prepared by solid state reaction from Li 2 CO 3 , MgO and NiO. The thermal analysis of the precursor materials up to 750°C showed the weight loss of about 30%. The X-ray diffraction patterns of the synthesized samples confirmed the presence of α-NaFeO 2 structure with the rhombohedral-hexagonal symmetry (space group, R3m) and no evidence of any impurities. The peaks intensity ratio I 003 /I 104 increased with Mg concentration, which indicates the cation mixing within transition metal layer and lithium layer. The Fourier transform infrared spectroscopy showed the presence of two broad vibrational bands between 400 and 1000 cm -1 and corresponding bands for the 3a and 3b octahedral sites of LiO 6 and MO 6 units. The scanning electron microscopy analyses showed that the prepared samples have porous and relatively uniform distribution of grain sizes in the range 0.4-3µm. The complex impedance spectroscopy studies of the samples sintered at 850°C were done in the frequency range from 42 Hz to 1 MHz with temperature variation from 30 to 100°C. The results revealed that the total electrical conductivity increases with temperature and frequency and at 100°C it is 7.06×10 -6 and 9.00×10 -6 S/cm for the LiNiO 2 and LiNi 1-x Mg x O 2 materials, respectively. The obtained relatively high conductivity and low dielectric constant confirmed that the prepared ceramics can be used as cathode materials for Li-ion batteries.

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Section: Ftir Studiesmentioning

confidence: 95%

Preparation, dielectric and conductivity studies of LiNi1-xMgxO2 cathode materials for lithium-ion batteries

Murali

Veeraiah

2017

PAC

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Effects of Graphene on the Electrochemical Properties of the Electrodes of Lithium Ion Batteries

Shen

Guo

2019

Advanced Battery Materials

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Comprehensive Understanding of Structure Transition in LiMn_yFe₁₋_yPO₄ during Delithiation/Lithiation

Li,

Zhang,

Liu

et al. 2023

Adv Funct Materials

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The complexity of structural changes in LiMnyFe1−yPO4 (LMFP) during delithiation/lithiation poses unique challenges in kinetics and cycling, distinguishing it significantly from LiFePO4. Therefore, comprehending the delithiation/lithiation mechanism of LMFP is essential to optimize material design, synthesis, and battery application management. However, existing reports show apparent discrepancies and contradictions. This paper elucidates the relaxation property of LMFP, providing a comprehensive review of crystal structure and electronic structure change mechanisms during delithiation/lithiation based on in situ characterization. Regarding crystal structure transition, variations in LMFP's compositional uniformity across different literature, stemming from differences in the synthesis process, may contribute to multiple mechanisms. Concerning electronic structure changes, the chemical environments between Fe and Mn are mutual interaction, and the sluggish kinetics of the Mn2+/Mn3+ reaction suggest partial charge compensation by oxygen in the phosphate group. Building on these findings, the paper addresses existing research deficiencies and identifies potential directions for future investigations into the delithiation/lithiation mechanism of LMFP, aiming to provide a solid theoretical foundation for developing new olivine‐type cathode materials with superior electrochemical performance.

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Significant role of “burned” graphene in determining the morphology of LiNiO2 prepared under the air conditions

Cited by 24 publications

References 39 publications

Preparation, dielectric and conductivity studies of LiNi1-xMgxO2 cathode materials for lithium-ion batteries

Preparation, dielectric and conductivity studies of LiNi1-xMgxO2 cathode materials for lithium-ion batteries

Effects of Graphene on the Electrochemical Properties of the Electrodes of Lithium Ion Batteries

Comprehensive Understanding of Structure Transition in LiMn_yFe₁₋_yPO₄ during Delithiation/Lithiation

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Significant role of “burned” graphene in determining the morphology of LiNiO2 prepared under the air conditions

Cited by 24 publications

References 39 publications

Preparation, dielectric and conductivity studies of LiNi1-xMgxO2 cathode materials for lithium-ion batteries

Preparation, dielectric and conductivity studies of LiNi1-xMgxO2 cathode materials for lithium-ion batteries

Effects of Graphene on the Electrochemical Properties of the Electrodes of Lithium Ion Batteries

Comprehensive Understanding of Structure Transition in LiMnyFe1−yPO4 during Delithiation/Lithiation

Contact Info

Product

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About

Comprehensive Understanding of Structure Transition in LiMn_yFe₁₋_yPO₄ during Delithiation/Lithiation