Modulating the Li+/Ni2+ replacement and electrochemical performance optimizing of layered lithium-rich Li1.2Ni0.2Mn0.6O2 by minor Co dopant

Huang, Xiaolan; Wang, Min; Che, Renchao

doi:10.1039/c4ta01217h

Cited by 33 publications

(26 citation statements)

References 47 publications

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“…Ap ossible method to improve the rate capability is reducingt he particle size to shorten the lithium diffusing length, [12,13] but that will also lower the package density and increase the specific surface area. [30] According to Huang's work, [31] the Li + /Ni 2 + replacement can be controlled by minor Co doping;t hus, ab etter rate performance could be obtained with alow Li + /Ni 2 + replacement. [10,22] Adjustmentso ft he morphologies by synthesis routines have led to significant progress, such as spheres, [11,23] nanoplates, [24,25] nanorods, [26,27] and nanowires.…”

Section: Introductionmentioning

confidence: 99%

Improving the Electrochemical Performance of Li_1.14Ni_0.18Mn_0.62O₂ by Modulating Structure Defects via a Molten Salt Method

Zhang

Liu

et al. 2015

ChemElectroChem

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Nanocrystalline Li1.14Ni0.18Mn0.62O2 cathode materials are synthesized by a molten salt method using KCl as the molten agent. The influence of the sintering temperature and the mass ratio of KCl to Li1.14Ni0.18Mn0.62O2 on the structure and electrochemical performance are investigated. The sintering temperature can markedly affect the formation of the layered structure and the content of stacking faults. The amount of KCl influences the cation ordering of the materials. The ratios of Li+/Ni2+ replacement for the materials obtained at 800 °C with a KCl amount of R=4, 8, and 12 [R=m(KCl)/m(Li1.14Ni0.18Mn0.62O2)] are 16.51, 8.39, and 4.46 %, respectively. A lower steric hindrance—related to a better cationic ordering—is obtained when the amount of KCl is increased, which is in agreement with the tendency of the Li+ diffusion coefficient. This study demonstrates a new approach to control the Li+/Ni2+ replacement in lithium‐rich layered cathode materials to improve their electrochemical performance.

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Section: Introductionmentioning

confidence: 99%

Improving the Electrochemical Performance of Li_1.14Ni_0.18Mn_0.62O₂ by Modulating Structure Defects via a Molten Salt Method

Zhang

Liu

et al. 2015

ChemElectroChem

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“…Taking into account the cost, low Co-based Li-rich material with high content of Mn should be developed. However, the Co-free Li-rich material usually suffers from poorer rate capability [24] because the presence of cobalt in materials can greatly enhance the oxygen loss, reduce the replacement of lithium and nickel, and effectively promote Li2MnO3 activation [25][26][27]. Developing doped high-performance Li-rich material using earth-abundant elements is more desirable and noble metals (such as Ru, Ag, etc.…”

Section: Introductionmentioning

confidence: 99%

Enhanced electrochemical performance of Li-rich low-Co Li1.2Mn0.56Ni0.16Co0.08−x Al x O2 (0≤x≤0.08) as cathode materials

Han

Yang

et al. 2016

Sci. China Mater.

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Layered Li1.2Mn0.56Ni0.16Co0.08−xAlxO2 (0 ≤ x ≤ 0.08) cathode materials were successfully synthesized by a sol-gel method. X-ray diffraction and the refinement data indicate that all materials have typical α-NaFeO2 structure with R-3m space group, and the a-axis has almost no change, but there is a slight decrease in the c lattice parameter as well as the cell volume. Scanning electron microscopy and high resolution transmission electron microscopy prove that all the samples have uniform particle size of about 200-300 nm and smooth surface. The energy-dispersive X-ray spectroscopy mapping shows that aluminum has been homogeneously doped in the Li1.2Mn0.56Ni0.16Co0.08O2 cathode material. The cyclic voltammetry and electrochemical impedance spectroscopy reveal that appropriate Al-doping contributes to the reversible lithium-ion insertion and extraction, and then reduces the electrochemical polarization and charge transfer resistance. Li1.2Mn0.56Ni0.16Co0.08−xAlxO2 (x = 0.05) shows the lowest charge transfer resistance and the highest lithium-ion diffusion coefficient among all the samples. The Li-rich electrodes with low-level Al doping shows a much higher discharge capacity than the pristine one, especially the Li1.2Mn0.56Ni0.16Co0.08−xAlxO2 (x = 0.05) sample, which exhibits greater rate capacity and better fast charge-discharge performance than the other samples. Li1.2Mn0.56Ni0.16Co0.08−xAlxO2 (x = 0.05) also exhibits higher discharge capacity than the pristine one at each cycle at 55°C. These results clearly indicate that the high rate capacity together with a good high rate cycling performance and high-temperature performance of the low-Co Li1.2Mn0.56Ni0.16Co0.08−xAlxO2 (x=0.05) is a promising alternative to next-generation lithium-ion batteries.

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“…Generally, the intensity ratio of (003) and (104) peaks is a parameter of cation mixing, when I 003 /I 104 ＞1.2, the cation mixing is small. [31] Table 2 also lists the lattice parameters a and c. a value is related to the material with layered characteristics, c value is well known for the average metal-metal interslab distance. c/a is related to trigonal distortion and the hexagonal structure disorder, thus a higher c/a value is preferred for well-defined hexagonal layered structure.…”

Section: Resultsmentioning

confidence: 99%

Preparation and Electrochemical Performance of Li[Ni_1/3Co_1/3Mn_1/3]O₂ Synthesized Using Li₂CO₃ as Template

et al. 2015

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Porous structure Li[Ni 1/3 Co 1/3 Mn 1/3 ]O 2 has been synthesized via a facile carbonate co-precipitation method using Li 2 CO 3 as template and lithium-source. The physical and electrochemical properties of the materials were examined by many characterizations including TGA, XRD, SEM, EDS, TEM, BET, CV, EIS and galvanostatic charge-discharge cycling. The results indicate that the as-synthesized materials by this novel method own a well-ordered layered structure α-NaFeO 2 [space group: R-3m(166)], porous morphology, and an average primary particle size of about 150 nm. The porous material exhibits larger specific surface area and delivers a high initial capacity of 169.9 mAh•g −1 at 0.1 C (1 C＝180 mA•g −1 ) between 2.7 and 4.3 V, and 126.4, 115.7 mAh•g −1 are still respectively reached at high rate of 10 C and 20 C. After 100 charge-discharge cycles at 1 C, the capacity retention is 93.3%, indicating the excellent cycling stability.

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Modulating the Li⁺/Ni²⁺ replacement and electrochemical performance optimizing of layered lithium-rich Li_1.2Ni_0.2Mn_0.6O₂ by minor Co dopant

Cited by 33 publications

References 47 publications

Improving the Electrochemical Performance of Li_1.14Ni_0.18Mn_0.62O₂ by Modulating Structure Defects via a Molten Salt Method

Improving the Electrochemical Performance of Li_1.14Ni_0.18Mn_0.62O₂ by Modulating Structure Defects via a Molten Salt Method

Enhanced electrochemical performance of Li-rich low-Co Li1.2Mn0.56Ni0.16Co0.08−x Al x O2 (0≤x≤0.08) as cathode materials

Preparation and Electrochemical Performance of Li[Ni_1/3Co_1/3Mn_1/3]O₂ Synthesized Using Li₂CO₃ as Template

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Modulating the Li+/Ni2+ replacement and electrochemical performance optimizing of layered lithium-rich Li1.2Ni0.2Mn0.6O2 by minor Co dopant

Cited by 33 publications

References 47 publications

Improving the Electrochemical Performance of Li1.14Ni0.18Mn0.62O2 by Modulating Structure Defects via a Molten Salt Method

Improving the Electrochemical Performance of Li1.14Ni0.18Mn0.62O2 by Modulating Structure Defects via a Molten Salt Method

Enhanced electrochemical performance of Li-rich low-Co Li1.2Mn0.56Ni0.16Co0.08−x Al x O2 (0≤x≤0.08) as cathode materials

Preparation and Electrochemical Performance of Li[Ni1/3Co1/3Mn1/3]O2 Synthesized Using Li2CO3 as Template

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Modulating the Li⁺/Ni²⁺ replacement and electrochemical performance optimizing of layered lithium-rich Li_1.2Ni_0.2Mn_0.6O₂ by minor Co dopant

Improving the Electrochemical Performance of Li_1.14Ni_0.18Mn_0.62O₂ by Modulating Structure Defects via a Molten Salt Method

Improving the Electrochemical Performance of Li_1.14Ni_0.18Mn_0.62O₂ by Modulating Structure Defects via a Molten Salt Method

Preparation and Electrochemical Performance of Li[Ni_1/3Co_1/3Mn_1/3]O₂ Synthesized Using Li₂CO₃ as Template