LiMn2O4 Prepared by Liquid Phase Flameless Combustion with F-Doped for Lithium-Ion Battery Cathode Materials

2013 ◽  
Vol 652-654 ◽  
pp. 825-830 ◽  
Author(s):  
Ming Wu Xiang ◽  
Xian Yan Zhou ◽  
Zhi Fang Zhang ◽  
Mi Mi Chen ◽  
Hong Li Bai ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Electrochemical Performance ◽  
Raw Materials ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Flameless Combustion ◽  
Capacity Retention ◽  
Vibrational Bands ◽  
Novel Method ◽  
Discharge Capacities

LiMn2O4-yFywere synthesized by a novel method named liquid phase flameless combustion reaction with LiNO3, MnAc2.4H2O and LiF as raw materials calcined at 600 °C for 3 h with HNO3as aided oxidant. All samples were investigated by X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR) and electrochemical performance. The results show that: all samples have main phase of LiMn2O4with impurity of Mn3O4and the vibrational bands of Mn-O are a little red shift by doping F, which indicated that the F- enter the host structure of LiMn2O4successfully. The electrochemical performance show that the initial discharge capacities of F-doped samples are lower than pristine LiMn2O4, which is 117.7 mAh•g-1. However, the capacity retention of LiMn2O3.96F0.04and LiMn2O3.90F0.10are 73.6% and 74.5%, respectively, which are higher than pristine LiMn2O4, which is only 69.0% after 40 cycles.

scholarly journals Electrochemical Behavior of NH4F-Pretreated Li1.25Ni0.20Fe0.13Co0.33Mn0.33O2 Cathodes for Lithium-ion Batteries

2020 ◽  
Vol 10 (3) ◽  
pp. 1021
Author(s):  
Yonglei Zheng ◽  
Yikai Li ◽  
He Wang ◽  
Siheng Chen ◽  
Xiangxin Guo ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Electrochemical Impedance ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Capacity Retention ◽  
Hierarchical Microspheres ◽  
Electrochemical Cycling ◽  
Novel Method ◽  
Diffraction Patterns ◽  
Discharge Capacities

We report a novel method to fabricate lithium-ion batteries cathodes with the NH4F pretreatment. In this study, NH4F-pretreated Li1.25Ni0.20Fe0.13Co0.33Mn0.33O2 hollow nano-micro hierarchical microspheres were synthesized for use as cathode materials. The X-ray diffraction patterns of NH4F-pretreated Li1.25Ni0.20Co0.33Fe0.13Mn0.33O2 were analyzed with the RIETAN-FP software program, and the results showed that the samples possess a layered α-NaFeO2 structure. The effects of pretreatment with NH4F on the electrochemical performance of the pristine material were evaluated through charge/discharge cycling, the rate performance, and electrochemical impedance spectroscopy (EIS). Pretreatment with NH4F significantly improved the discharge capacities and coulombic efficiencies of Li1.25Ni0.20Co0.33Fe0.13Mn0.33O2 in the first cycle and during subsequent electrochemical cycling. The sample pretreated with an appropriate amount of NH4F (NFCM 90) showed the highest discharge capacity (209.1 mA h g−1) and capacity retention (85.2% for 50 cycles at 0.1 C). The EIS results showed that the resistance of the NFCM 90 sample (76.32 Ω) is lower than that of the pristine one (206.2 Ω).

Electrochemical Performance of Spherical Li3V2(PO4)3/C Synthesized by Spray Drying Method

2017 ◽  
Vol 727 ◽  
pp. 738-743 ◽  
Author(s):  
Zong Lin Zuo ◽  
Jin Wang ◽  
Jian Qiu Deng ◽  
Qing Rong Yao ◽  
Zhong Min Wang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Spray Drying ◽  
Cathode Materials ◽  
Lithium Ion ◽  
Drying Method ◽  
X Ray Diffraction ◽  
Capacity Retention ◽  
Voltage Range ◽  
X Ray ◽  
Discharge Capacities

Spherical Li3V2(PO4)3/C cathode materials have been successfully synthesized by a spray drying method. The structure and morphology of the cathode materials are characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric (TG) analysis. The results show that synthesized monoclinic Li3V2(PO4)3 with high purities exhibits spherical morphology, in favor of enhancing the capacities and cycling stability of Li3V2(PO4)3/C cathode materials for lithium-ion battery. The Li3V2(PO4)3/C cathode materials sintered at 750 °C present best electrochemical performance among all the samples. It exhibits high initial discharge capacities of 99.2 mAhg-1 and capacity retention of 93.6% after 200 cycles at a rate of 1C within a voltage range of 3.0–4.3 V.

Synthesis and Performance of LiCo1/3Mn1/3Ni1/3O2 Cathode Material for Lithium-Ion Battery

2011 ◽  
Vol 399-401 ◽  
pp. 1491-1495
Author(s):  
Huan Liu ◽  
Yao Chun Yao ◽  
Yong Mei Li ◽  
Hui Hua Yi ◽  
Yong Nian Dai
Keyword(s):  
Electrochemical Performance ◽  
Cathode Material ◽  
Discharge Capacity ◽  
Raw Materials ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Solid State Method ◽  
Excellent Electrochemical Performance ◽  
And Performance ◽  
Xrd Patterns

The layered cathode material for Li-ion batteries was synthesized by mechanical activation-high temperature solid state method. XRD and electrochemical measurements were used to characterize the structure and electrochemical performance of the product. The X-ray diffraction (XRD) patterns reveal that the material is crystallized to layered a-NaFeO2structure. The cathode material with excellent electrochemical performance was obtained by sintering the mixed raw materials with n (Li)/n (M) =1.11. The initial discharge capacity was 128mAh/g at a current density of 20mA/g between 2.7-4.2V and the discharge capacity retention was 96% after 50 cycles.

Effect of Calcination Temperature on the Structure and Electrochemical Performance of LiNi0.4Co0.2Mn0.4O2

2014 ◽  
Vol 912-914 ◽  
pp. 18-22
Author(s):  
Lin Zhang ◽  
Fei Luo ◽  
Jian Hua Wang ◽  
Yu Zhong Guo
Keyword(s):  
Electrochemical Performance ◽  
Calcination Temperature ◽  
Discharge Capacity ◽  
Retention Rate ◽  
Lithium Ion ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Capacity Retention ◽  
Cation Mixing ◽  
Co Precipitation

LiNi0.4Co0.2Mn0.4O2, as the cathode materials for lithium ion battery, were prepared from the precursors, Ni0.4Co0.2Mn0.4 (OH)2 which were synthesized by chemical co-precipitation method. The crystal structure and morphology of the prepared powders have been characterized by X-ray diffraction and SEM, respectively. The results show that Li+/Ni2+ cation mixing decreases with increase of calcination temperature in the range of 700-900°C.The lower degree of cation mixing can improve the transfer of Li ions and lead to layered structure more stable. The discharge capacity and the capacity retention rate of the material is strongly impacted by the reaction temperature.The powders sintered at 900°C show the best electrochemical performance and the initial discharge capacity is 148.3mA·h/g, after 40 cycles, the capacity retention rate is 93.9%.

Study of Circulation of Reaction Liquid in Liquid Phase Synthesis of LiFePO4 as Cathode Material

2015 ◽  
Vol 1120-1121 ◽  
pp. 128-131
Author(s):  
Jun Jun Ma ◽  
Jia Zhou ◽  
Xue Min Zu ◽  
Xing Yao Wang
Keyword(s):  
Liquid Phase ◽  
Cathode Material ◽  
Raw Materials ◽  
Lithium Ion ◽  
Phase Method ◽  
Capacity Retention ◽  
Phase Synthesis ◽  
Initial Discharge ◽  
Liquid Phase Method ◽  
Lifepo4 Cathode

LiFePO4 as cathode materials for lithium-ion battery were prepared by a liquid-phase method which utilizes FeSO4•7H2O, NH4H2PO4, H2O2, CH3COOLi and glucose as raw materials. The aqueous can be directly used in the synthesis of FePO4•xH2O without any treatment and the ethanol should be distilled before the synthesis of LiFePO4. The result showed that the high purity of FePO4•xH2O can be achieved even prepared with the aqueous which was used for five times. LiFePO4 cathode material prepared with the distilled ethanol exhibited the best initial discharge capacity of 156.3 mAh•g-1 and the capacity retention ratio 99.49% after 30 cycles at 0.1 C rate.

Electrochemical Performance Ni Doped Spinel LiMn2O4 Cathode for Lithium Ion Batteries

2011 ◽  
Vol 347-353 ◽  
pp. 290-300
Author(s):  
Yong Li Cui ◽  
Wen Jing Bao ◽  
Zheng Yuan ◽  
Quan Chao Zhuang ◽  
Zhi Sun
Keyword(s):  
Electrochemical Performance ◽  
Discharge Capacity ◽  
Retention Rate ◽  
Sol Gel ◽  
Lithium Ion ◽  
Cyclic Voltammogram ◽  
X Ray Diffraction ◽  
Capacity Retention ◽  
Excellent Electrochemical Performance ◽  
Charge Discharge

LiNixMn2-xO4 (x=0, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5) compounds with spinel crystal structure are synthesized by sol-gel method. The dependence of the physicochemical properties of these compounds has been extensively investigated by using X-ray diffraction (XRD), scanning electron microscope (SEM), cyclic voltammogram (CV) and charge-discharge test. It is found that as Mn is replaced by Ni, the initial capacity decreases, but the capacity retention is enhanced. Of all the LiNixMn2-xO4 (x=0, 0.05, 0.1, 0.2, 0.3, 0.4) compounds, the LiNi0.2Mn1.8O4 has best electrochemical performance, about 120mAhg-1 discharge capacity, its capacity retention rate of 96.6% after 100 cycles. However the LiNi0.5Mn1.5O4 sample shows excellent electrochemical performance at 4.7 V high potential, 150 mAhg-1 discharge capacity, above 110 mAhg-1 of capacity retention after 42 cycles of charge/discharge. The prepared LiNi0.5Mn1.5O4 powders sintered at 750 °C here has Fd3m space group.

Effect of Cr Doping on Electrochemical Performance of LiMn2O4

2013 ◽  
Vol 652-654 ◽  
pp. 848-852
Author(s):  
Zhi Fang Zhang ◽  
Mi Mi Chen ◽  
Ming Wu Xiang ◽  
Li Li Feng ◽  
Ying Jie Zhang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
High Purity ◽  
Raw Materials ◽  
Synthesis Method ◽  
Lithium Ion ◽  
Capacity Retention ◽  
Peak Intensity ◽  
Cr Doping ◽  
Initial Capacity ◽  
Better Than

The LiCrxMn2-xO4 material used for lithium ion battery cathode material was successfully prepared by a molten-salt flameless combustion synthesis method which used the LiNO3, LiAc•2H2O, Mn(NO3)2, MnAc2•4H2O as raw materials and Cr(NO3)3•9H2O as dopant. The results indicated that, the high-purity spinel LiCrxMn2-xO4was successfully prepared although including a little Mn3O4. The impurity peak intensity of Mn3O4gradually weakened until it disappeared with the increase of the amount of Cr-doped. The product was monophasic LiCrxMn2-xO4when x (Cr) ≥ 0.1. It can be found that with Cr doped, the aggregation of the sample decreased. The structural stability, electrochemical activity and reversibility of LiCrxMn2-xO4was better than that of pristine LiMn2O4. The discharge capacity and capacity retention had been improved. The LiCr0.02Mn1.98O4had the highest initial capacity of 120.7 mAh•g-1and the capacity retention was 78.5% after 40 cycles.

scholarly journals Synthesis and Electrochemical Properties of TiNb2O7 and Ti2Nb10O29 Anodes under Various Annealing Atmospheres

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 983
Author(s):  
Touraj Adhami ◽  
Reza Ebrahimi-Kahrizsangi ◽  
Hamid Reza Bakhsheshi-Rad ◽  
Somayeh Majidi ◽  
Milad Ghorbanzadeh ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Annealing Treatment ◽  
Lithium Ion ◽  
Argon Atmosphere ◽  
Oxygen Atmosphere ◽  
Annealing Atmosphere ◽  
Electrochemical Characteristics ◽  
X Ray Diffraction ◽  
Lower Capacity ◽  
Discharge Capacities

In this study, two compounds of TiNb2O7 and Ti2Nb10O29 were successfully synthesized by mechanochemical method and post-annealing as an anode material for lithium-ion batteries. The effect of annealing atmosphere on the morphology, particle size, and electrochemical characteristics of two compounds was investigated. For these purposes, the reactive materials were milled under an argon atmosphere with a certain mole ratio. Subsequently, each sample was subjected to annealing treatment in two different atmospheres, namely argon and oxygen. Phase and morphology identifications were carried out by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) to identify the phases and evaluate the morphology of the synthesized samples. The charging and discharging tests were conducted using a battery-analyzing device to evaluate the electrochemical properties of the fabricated anodes. Annealing in different atmospheres resulted in variable discharge capacities so that the two compounds of TiNb2O7 and Ti2Nb10O29 annealed under the argon atmosphere showed a capacity of 60 and 66 mAh/g after 179 cycles, respectively, which had a lower capacity than their counterpart under the oxygen atmosphere. The final capacity of the annealed samples in the oxygen atmosphere is 72 and 74 mAh/g, respectively.

scholarly journals V2O3/C composite fabricated by carboxylic acid-assisted sol–gel synthesis as anode material for lithium-ion batteries

2021 ◽  
Author(s):  
G. S. Zakharova ◽  
E. Thauer ◽  
A. N. Enyashin ◽  
L. F. Deeg ◽  
Q. Zhu ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Sol Gel ◽  
Carbon Sources ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Electron Microscopies ◽  
Transmission Electron ◽  
Battery Electrode ◽  
Sol Gel Synthesis

AbstractThe potential battery electrode material V2O3/C has been prepared using a sol–gel thermolysis technique, employing vanadyl hydroxide as precursor and different organic acids as both chelating agents and carbon sources. Composition and morphology of resultant materials were characterized by X-ray diffraction, Raman spectroscopy, scanning and transmission electron microscopies, physical sorption, and elemental analysis. Stability and electronic properties of model composites with chemically and physically integrated carbon were studied by means of quantum-chemical calculations. All fabricated composites are hierarchically structured and consist of carbon-covered microparticles assembled of polyhedral V2O3 nanograins with intrusions of amorphous carbon at the grain boundaries. Such V2O3/C phase separation is thermodynamically favored while formation of vanadium (oxy)carbides or heavily doped V2O3 is highly unlikely. When used as anode for lithium-ion batteries, the nanocomposite V2O3/C fabricated with citric acid exhibits superior electrochemical performance with an excellent cycle stability and a specific charge capacity of 335 mAh g−1 in cycle 95 at 100 mA g−1. We also find that the used carbon source has only minor effects on the materials’ electrochemical performance.

Synthesis of Spherical LiFePO4/C Composites as Cathode Material of Lithium-Ion Batteries by a Novel Glucose Assisted Hydrothermal Method

2013 ◽  
Vol 787 ◽  
pp. 58-64 ◽  
Author(s):  
Xiang Feng Li ◽  
Zhao Zhang ◽  
Fang Liu ◽  
Shu Ping Zheng
Keyword(s):  
Hydrothermal Method ◽  
Raw Materials ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
High Discharge ◽  
X Ray ◽  
High Discharge Capacity ◽  
Optimal Sample ◽  
Structure Morphology

The LiFePO4/C composites with different morphology are synthesized by a novel glucose assisted hydrothermal method at various glucose concentrations (from 0 to 0.25mol/L) and the insoluble lithium source Li2CO3, (NH4)2Fe (SO4)2·6H2O and (NH4)2HPO4(n (Li):n (Fe):n (P)=1:1:1) are used as raw materials. The structure, morphology, thermal performance and electrochemical properties of the synthesized composites are characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), thermogravimetry/differential scanning calorimetry (TG-DSC), galvanostatic charge/discharge tests and cyclic voltammetry (CV). The results show that the LiFePO4/C synthesized with 0.125mol/L glucose has the relatively small particles size (0.1~0.5μm) and the well spherical morphology. The optimal sample exhibits a high discharge capacity of 160.0mAh/g at the first cycle and exhibits a good reversibility and stability in CV tests.

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