Enhanced electrochemical performances of layered-spinel heterostructured lithium-rich Li1.2Ni0.13Co0.13Mn0.54O2 cathode materials

Ku, Lun; Cai, Yanfei; Ma, Yating; Zheng, Hongfei; Liu, Pengfei; Qiao, Zhensong; Xie, Qingshui; Wang, Laisen; Peng, Dong‐Liang

doi:10.1016/j.cej.2019.03.247

Cited by 124 publications

(53 citation statements)

References 38 publications

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“…Similarly, the initial discharge capacity of M-LMNO electrode is 245.5 mAh g À1 , which is 10 mAh g À1 larger than that of P-LMNO electrode at 0.5 C. Furthermore, the initial coulombic efficiency (CE) of M-LMNO electrode is much higher than that of P-LMNO electrode (81.8 % vs. 77.9 %), suggesting a better reversible anion redox. Compared with P-LMNO electrode, the discharge profile of M-LMNO electrode has a dominant voltage plateau of spinel structure around 2.8 V. [11] The corresponding redox peaks are observed in Figure 3 b. A pair of oxidation/reduction peaks near 3.02/2.85 V is clearly found at the initial CV curve of M-LMNO electrode, which is assigned to the spinel structure.…”

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confidence: 94%

“…A pair of oxidation/reduction peaks near 3.02/2.85 V is clearly found at the initial CV curve of M-LMNO electrode, which is assigned to the spinel structure. [11,18] Unlike P-LMNO electrode (Supporting Information, Figure S8), all of the redox peaks of M-LMNO electrode are almost overlapped, which manifests that surface structure stability is improved after modification. Figure 3 c shows the cycling property of two electrodes at 0.5 C. Both the discharge capacity and cycle stability of M-LMNO electrode are superior to those of the P-LMNO electrode.…”

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confidence: 98%

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An Ultra‐Long‐Life Lithium‐Rich Li_1.2Mn_0.6Ni_0.2O₂ Cathode by Three‐in‐One Surface Modification for Lithium‐Ion Batteries

et al. 2020

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Voltage decay and capacity fading are the main challenges for the commercialization of Li‐rich Mn‐based layered oxides (LLOs). Now, a three‐in‐one surface treatment is designed via the pyrolysis of urea to improve the voltage and capacity stability of Li1.2Mn0.6Ni0.2O2 (LMNO), by which oxygen vacancies, spinel phase integration, and N‐doped carbon nanolayers are synchronously built on the surface of LMNO microspheres. Oxygen vacancies and spinel phase integration suppress irreversible O2 release and help lithium ion diffusion, while N‐doped carbon nanolayer mitigates the corrosion of electrolyte with excellent conductivity. The electrochemical performance of LMNO after the treatment improves significantly; the capacity retention rate after 500 cycles at 1 C is still as high as 89.9 % with a very small voltage fading rate of 1.09 mV cycle−1. This three‐in‐one surface treatment strategy can suppress the voltage decay and capacity fading of LLOs.

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confidence: 94%

mentioning

confidence: 98%

An Ultra‐Long‐Life Lithium‐Rich Li_1.2Mn_0.6Ni_0.2O₂ Cathode by Three‐in‐One Surface Modification for Lithium‐Ion Batteries

et al. 2020

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“…As shown in Table 3, the LMD cathode material exhibit a low transfer charge resistance in order of 78.12 Ω which is better in comparison with previously found one for LiMn 2 O 4 in the literature, 58,65‐67 which indicates that the electronic conductivity in LMD cathode was enhanced.…”

Section: Resultsmentioning

confidence: 57%

Molten salt synthesis of LiMn ₁ _. ₂ Ni ₀ _. ₃ Cr ₀ _. ₁ Co ₀

Iffer¹,

Belaı̈che²,

Elansary³

et al. 2021

Intl J of Energy Research

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The molten salt synthesis method became an excellent synthesis technique to elaborate nanomaterials because of its meritorious advantages including low cost, easy to scale up, simple to operate, and environmental friendliness. For this reason, the compound LiMn 1.2 Ni 0.3 Cr 0.1 Co 0.15 Al 0.23 La 0.02 O 4 was synthesized for the first time by molten salt method using NaCl as the salt and a nonstandard manganese source with metallurgical grade. The obtained cathode material was analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transformer infra-red (FT-IR), and electrochemical characterization. XRD and FT-IR results confirm the stability and formation of pure spinel phase without any impurities. TEM images showed that the spinel synthesized phase consists of 77 to 135 nm-sized polyhedral nanoparticles. The cyclic voltammogram results showed that the synthesized spinel cathode material exhibits two-main redox peaks at 4.06/3.9 V and 3.1/2.8 V vs Li + /Li, which indicate the possibility of insertion of extra lithium in the spinel structure. Galvanostatic charge-discharge studies were also carried out showed that the prepared spinel material has two discharge plateaus in the potential window of 1.5 to 5 V and a discharge capacity of 179 mAh g À1 at 0.1 C, which is higher than the theoretical value which confirms the insertion of extra lithium in the spinel structure and enhance the capacity of the cathode material. The electrochemical impedance spectroscopy was performed, and the Li-ion diffusion coefficient was also calculated.

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Section: Resultsmentioning

confidence: 92%

“…However, the Feox-2 %a nd 5% electrodes display the oxidation/ reduction peaks around 2.9/3.02 Vinthe first cycle,suggesting the spinel phase formation on the surface. [21] As to the rate performance (Figure 6b), the discharge capacities of Feox-2% are 246. 8, 235.3, 218.5, 198.6, 181.3, 155.1, and 111.8 mAh g À1 at 0.1 C, 0.2 C, 0.5 C, 1C,2C, 5C,a nd 10 C, respectively.However,the corresponding capacities of PLLR are only 222.…”

Section: Methodsmentioning

confidence: 92%

A Simple Gas–Solid Treatment for Surface Modification of Li‐Rich Oxides Cathodes

Zhang²,

Chen

et al. 2021

Angewandte Chemie

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Li-richl ayered oxides with high capacity are expected to be the next generation of cathode materials. However,t he irreversible and sluggish anionic redox reaction leads to the O 2 loss in the surface as well as the capacity and voltage fading.I nt he present study,asimple gas-solid treatment with ferrous oxalate has been proposed to uniformly coat at hin spinel phase layer with oxygen vacancy and simultaneously realize Fe-ion substitution in the surface.T he integration of oxygen vacancy and spinel phase suppresses irreversible O 2 release,p revents electrolyte corrosion, and promotes Li-ion diffusion. In addition, the surface doping of Fe-ion can further stabilizet he structure.A ccordingly,t he treated Feox-2 %c athode exhibits superior capacity retention of 86.4 %a nd 85.5 %a t1Ca nd 2C to that (75.3 %a nd 75.0 %) of the pristine sample after 300 cycles,r espectively. Then, the voltage fading is significantly suppressed to 0.0011 V per cycle at 2Cespecially.T he encouraging results may play asignificant role in paving the practical application of Li-rich layered oxides cathode.

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Enhanced electrochemical performances of layered-spinel heterostructured lithium-rich Li1.2Ni0.13Co0.13Mn0.54O2 cathode materials

Cited by 124 publications

References 38 publications

An Ultra‐Long‐Life Lithium‐Rich Li_1.2Mn_0.6Ni_0.2O₂ Cathode by Three‐in‐One Surface Modification for Lithium‐Ion Batteries

An Ultra‐Long‐Life Lithium‐Rich Li_1.2Mn_0.6Ni_0.2O₂ Cathode by Three‐in‐One Surface Modification for Lithium‐Ion Batteries

Molten salt synthesis of LiMn ₁ _. ₂ Ni ₀ _. ₃ Cr ₀ _. ₁ Co ₀

A Simple Gas–Solid Treatment for Surface Modification of Li‐Rich Oxides Cathodes

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Enhanced electrochemical performances of layered-spinel heterostructured lithium-rich Li1.2Ni0.13Co0.13Mn0.54O2 cathode materials

Cited by 124 publications

References 38 publications

An Ultra‐Long‐Life Lithium‐Rich Li1.2Mn0.6Ni0.2O2 Cathode by Three‐in‐One Surface Modification for Lithium‐Ion Batteries

An Ultra‐Long‐Life Lithium‐Rich Li1.2Mn0.6Ni0.2O2 Cathode by Three‐in‐One Surface Modification for Lithium‐Ion Batteries

Molten salt synthesis of LiMn 1 . 2 Ni 0 . 3 Cr 0 . 1 Co 0

A Simple Gas–Solid Treatment for Surface Modification of Li‐Rich Oxides Cathodes

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An Ultra‐Long‐Life Lithium‐Rich Li_1.2Mn_0.6Ni_0.2O₂ Cathode by Three‐in‐One Surface Modification for Lithium‐Ion Batteries

An Ultra‐Long‐Life Lithium‐Rich Li_1.2Mn_0.6Ni_0.2O₂ Cathode by Three‐in‐One Surface Modification for Lithium‐Ion Batteries

Molten salt synthesis of LiMn ₁ _. ₂ Ni ₀ _. ₃ Cr ₀ _. ₁ Co ₀