Preparation and electrochemical properties of high-voltage cathode materials, LiMyNi0.5−yMn1.5O4 (M=Fe, Cu, Al, Mg; y=0.0–0.4)

Fey, George Ting‐Kuo; Lu, Cheng‐Zhang; Kumar, T. Prem

doi:10.1016/s0378-7753(03)00010-7

Cited by 177 publications

(64 citation statements)

References 27 publications

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“…In this equivalent circuit (inset), R Ω and R ct are the ohmic resistance (total resistance of the electrolyte, separator, and electrical contacts) and chargetransfer resistance, respectively. CPE is the constant phase-angle element, involving double layer capacitance, and W represents the Warburg impedance, reflecting the solidstate diffusion of Li ions into the bulk of the active materials, which is associated with the inclined line at low frequencies [53]. It can be seen clearly that the R ct is much smaller for the MoO 3 /graphene (R ct = 216.5 Ω) electrode than for the MoO 3 (R ct = 640.8 Ω) electrode after the 5 th cycle, which indicates that the graphene coating could enable much easier charge transfer at the electrode/electrolyte interface and consequently, decrease the overall battery internal resistance.…”

Section: Field Emission Sem (Fesem) Observations Of the Moo 3 Nanobelmentioning

confidence: 99%

Rapid synthesis of free-standing MoO3/Graphene films by the microwave hydrothermal method as cathode for bendable lithium batteries

Noerochim

Wang

Wexler

et al. 2013

Journal of Power Sources

119

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Highly flexible, binder-free, MoO3 nanobelt/graphene film electrode is prepared by a two-step microwave hydrothermal method. Graphene is first prepared by an ultra-fast microwave hydrothermal method and then mixed with MoO3 solution to synthesize the MoO3 nanobelt/graphene composite, which exhibits the combination of stacked graphene sheets and uniform MoO3 nanobelts with widths of 200-500 nm and lengths of 5-10 μm. The charge-discharge measurements show that the as-synthesized MoO3/graphene hybrid materials demonstrate excellent rate capability, large capacity, and good cycling stability compared to the pure MoO3 film. An initial discharge capacity of 291 mAh g-1 can be obtained at 100 mA g-1, with a capacity of 172 mAh g -1 retained after 100 cycles. The results show that the MoO 3/graphene designed in this study can be used as a free-standing cathode material in rechargeable bendable Lithium batteries. © 2012 Published by Elsevier B.V. All rights reserved.Keywords rapid, lithium, bendable, cathode, method, hydrothermal, microwave, films, graphene, moo3, free, synthesis, standing, batteries Disciplines Engineering | Science and Technology Studies Publication DetailsNoerochim, L., Wang, J., Wexler, D., Chao, Z. & Liu, H. (2013). Rapid synthesis of free-standing MoO3/ Graphene films by the microwave hydrothermal method as cathode for bendable lithium batteries. Journal of Power Sources, • A new method to synthesize high quality of MoO 3 nanobelts from commercial bulk.• Ultra-fast microwave hydrothermal method for fabrication MoO 3 /graphene films.• MoO 3 /graphene hybrid materials demonstrate good cycling stability as cathode. 3 IntroductionThe There are several reports on the hydrothermal synthesis of MoO 3 nanostructures to produce materials with high purity, homogeneity, good crystallinity, and unique properties [20,[38][39][40]. Microwave irradiation can be used as an alternative heat source for the 5 hydrothermal process [41,42]. It leads to a rapid heating to attain the desired temperature in a short time and increases the reaction kinetics compared to the conventional hydrothermal method. In a microwave-assisted hydrothermal reaction, the heating rate is extremely rapid, due to the dielectric property of the medium or solvent [41,42]. Recently, Phuruangrat et al. [43] reported MoO 3 nanowires 50 nm in diameter and 10-12 μm in length that were synthesized by the microwave assisted hydrothermal method with cetyl trimethylammonium bromide (CTAB) as the surfactant-template.Here, we present a new method to synthesize high quality MoO 3 nanobelts from commercial bulk MoO 3 without a surfactant-template and combine them with graphene via a two-step microwave hydrothermal method for fabrication of highly flexible free-standing MoO 3 /graphene films. The free-standing MoO 3 nanobelt/graphene films prepared by the above method followed by the vacuum filtration technique were investigated as a cathode material for bendable Lithium batteries and compared with MoO 3 nanobelt films prepared by a similar method ...

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Section: Field Emission Sem (Fesem) Observations Of the Moo 3 Nanobelmentioning

confidence: 99%

Rapid synthesis of free-standing MoO3/Graphene films by the microwave hydrothermal method as cathode for bendable lithium batteries

Noerochim

Wang

Wexler

et al. 2013

Journal of Power Sources

119

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“…The capacity retention increases from 87.5% to 93.6% after LiCoO 2 coating. Compared with other coating materials such as Al 2 O 3 [19], La 2 O 3 [20], AlPO 4 [21], In these paper, surface modification by sol-gel method can improve the high-temperature cycling stability of LiMn 2 O 4 , because oxide layer can reduce the contact area of LiMn 2 O 4 and electrolyte. However, the covering layer is not very uniform, the highest capacity retention is about 89%, coupled with the oxide itself do not have de-intercalation and intercalation of Li ions, it will result in a decrease in initial capacity.…”

Section: Resultsmentioning

confidence: 99%

Enhanced High-Temperature Cycling Stability of LiMn2O4 by LiCoO2 Coating as Cathode Material for Lithium Ion Batteries

Yan¹,

Liu²,

Wang³

et al. 2014

MSCE

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LiCoO2 surface layer is proposed and prepared through sol-gel method. The physical and electrochemical performances of pristine LiMn2O4 and LiCoO2-coated LiMn2O4 cathode materials were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, electrochemical measurements respectively. Comparing with the pristine LiMn2O4, the LiCoO2-coated LiMn2O4 phase significantly improved cycling stability, especially at 55˚C. Additionally, the thermal safety of LiMn2O4 is greatly enhanced after being coated by LiCoO2. ICP-AES measurement, structural analysis, and impedance experiments indicate that the improved electrochemical property of LiCoO2-coated LiMn2O4 should be attributed to the alleviated dissolution loss of manganese, strengthened structural stability.

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“…For this reason, it is of high importance to develop high voltage and high capacity materials delivering higher energy density compared to the commonly used materials. Numerous efforts towards designing and developing high voltage cathode materials have been made and are still in focus of exhaustive research [6,7]. One of the main obstacles related to application of high voltage cathode materials in LIBs with graphite as anode material, refers to selection of an appropriate electrolyte formulation that fulfills the mandatory minimum requirements.…”

Section: Introductionmentioning

confidence: 99%

“…One of the main obstacles related to application of high voltage cathode materials in LIBs with graphite as anode material, refers to selection of an appropriate electrolyte formulation that fulfills the mandatory minimum requirements. Among them, the electrolyte has to maintain electrochemical stability, which is not the case for the commercially used organic carbonate-based electrolytes containing lithium hexafluorophosphate (LiPF 6 ) as conductive salt [8], as they decompose at a potential of 4.5 V vs. Li/Li + [9]. On the other hand, the desired electrolyte has to enable formation, like the organic carbonate based electrolytes [10][11][12], of a kinetically stable solid electrolyte interphase (SEI) on the graphite electrode [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Ethyl Methyl Sulfone-Based Electrolytes for Lithium Ion Battery Applications

et al. 2017

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Sulfone-based electrolytes, known for their higher oxidative stability compared to the typically used organic carbonate-based electrolytes, are considered promising electrolytes for high voltage cathode materials towards the objective of obtaining increased energy density in lithium ion batteries. Nevertheless, sulfones suffer from high viscosity as well as incompatibility with highly graphitic anode materials, which limit their application. In this paper, the effect of fluoroethylene carbonate (FEC) as an electrolyte additive for the application of ethyl methyl sulfone (EMS) electrolytes containing LiPF 6 as conducting salt, is studied in graphite-based cells by means of selected electrochemical and spectroscopic methods. In addition, influence of ethylene acetate (EA) as co-solvent on the electrolyte viscosity and conductivity of the EMS-based electrolytes is discussed, revealing improved overall nickel cobalt manganese oxide (NMC)/graphite cell performance. X-ray photoelectron spectroscopy (XPS) measurements provide information about the surface chemistry of the graphite electrodes after galvanostatic cycling. The concept of EA as co-solvent is found to be applicable for other sulfones such as isopropyl methyl sulfone (MeiPrSO 2 ) and ethyl isopropyl sulfone (EtiPrSO 2 ).

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Preparation and electrochemical properties of high-voltage cathode materials, LiMyNi0.5−yMn1.5O4 (M=Fe, Cu, Al, Mg; y=0.0–0.4)

Cited by 177 publications

References 27 publications

Rapid synthesis of free-standing MoO3/Graphene films by the microwave hydrothermal method as cathode for bendable lithium batteries

Rapid synthesis of free-standing MoO3/Graphene films by the microwave hydrothermal method as cathode for bendable lithium batteries

Enhanced High-Temperature Cycling Stability of LiMn<SUB>2</SUB>O<SUB>4</SUB> by LiCoO<SUB>2</SUB> Coating as Cathode Material for Lithium Ion Batteries

Ethyl Methyl Sulfone-Based Electrolytes for Lithium Ion Battery Applications

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Preparation and electrochemical properties of high-voltage cathode materials, LiMyNi0.5−yMn1.5O4 (M=Fe, Cu, Al, Mg; y=0.0–0.4)

Cited by 177 publications

References 27 publications

Rapid synthesis of free-standing MoO3/Graphene films by the microwave hydrothermal method as cathode for bendable lithium batteries

Rapid synthesis of free-standing MoO3/Graphene films by the microwave hydrothermal method as cathode for bendable lithium batteries

Enhanced High-Temperature Cycling Stability of LiMn&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;4&lt;/SUB&gt; by LiCoO&lt;SUB&gt;2&lt;/SUB&gt; Coating as Cathode Material for Lithium Ion Batteries

Ethyl Methyl Sulfone-Based Electrolytes for Lithium Ion Battery Applications

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Enhanced High-Temperature Cycling Stability of LiMn<SUB>2</SUB>O<SUB>4</SUB> by LiCoO<SUB>2</SUB> Coating as Cathode Material for Lithium Ion Batteries