Synthesis and Electrochemical Properties of LiFe (PO4)(1-x/3)Fx/C as a Cathode Material

2013 ◽  
Vol 827 ◽  
pp. 16-19
Author(s):  
Shi Tao Song ◽  
Su Xia Wu ◽  
Zhi Wei Zhang ◽  
You Shun Peng
Keyword(s):  
Cathode Material ◽  
Effective Means ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Constant Current ◽  
Electrochemical Performances ◽  
X Ray Diffraction ◽  
X Ray ◽  
Constant Current Charge ◽  
Discharge Experiment

on doping is an effective means to improve the performance of LiFePO4 material. In the present study, composites LiFe (PO4)(1-x/3)Fx/C (x=0.00,0.02,0.04,0.06,0.08,0.10) were synthesized by carbothermal reduction method. The as-synthesized samples were characterized by X-ray diffraction and scanning electron microscope, and their electrochemical performances were investigated by constant current charge-discharge experiment. The results indicated that the low concentration F dopant did not affect the structure of LiFePO4 but considerable improved its electrochemical performances. The LiFe (PO4)0.98F0.06/C materials showed better electrochemical performances than LiFePO4/C. At 0.2 C discharging rate, the LiFe (PO4)0.98F0.06/C materials was capable of delivering reversible specific capacity of 165.1 mAh/g, with fairly stable cycleability. The excellent performance indicates that this mix-doped composite was a very promising cathode material for lithium ion batteries.

Synthesis and Electrochemical Properties of a LiNi0.7Co0.3O1.9Cl0.1 Cathode Material for Lithium-Ion Battery

2007 ◽  
Vol 336-338 ◽  
pp. 463-465 ◽  
Author(s):  
Xin Lu Li ◽  
Fei Yu Kang ◽  
Yong Ping Zheng ◽  
Xiu Juan Shi ◽  
Wan Ci Shen
Keyword(s):  
Hexagonal Lattice ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Constant Current ◽  
Cyclic Voltammograms ◽  
X Ray Diffraction ◽  
X Ray ◽  
Constant Current Charge ◽  
Initial Cycle ◽  
Partial Oxygen

Partial oxygen in LiNi0.7Co0.3O2 was replaced by chlorine to form LiNi0.7Co0.3O1.9Cl0.1. Phase structure of LiNi0.7Co0.3O1.9Cl0.1 was identified as a pure hexagonal lattice of α-NaFeO2 type by X-ray diffraction. Discharge capacity of LiNi0.7Co0.3O1.9Cl0.1 was 202 mAh/g in initial cycle at 15 mA/g current density in 2.5- 4.3 V potential window. The constant current charge/discharge experiments and cyclic voltammograms showed that chlorine addition was effective to improve reversible capacity and cycle stability of LiNi0.7Co0.3O2.

Synthesis and Characterization of LiVOPO4 Cathode Material by Solid-State Method

2012 ◽  
Vol 554-556 ◽  
pp. 436-439 ◽  
Author(s):  
An Ping Tang ◽  
Ze Qiang He ◽  
Jie Shen ◽  
Guo Rong Xu
Keyword(s):  
Solid State ◽  
Cathode Material ◽  
Lithium Ion ◽  
Chemical Diffusion ◽  
Chemical Diffusion Coefficient ◽  
Electrochemical Performances ◽  
X Ray Diffraction ◽  
Solid State Method ◽  
X Ray ◽  
State Method

Lithium vanadyl phosphate (β-LiVOPO4) cathode material for lithium ion batteries was prepared via a novel solid state method. The microstructure and electrochemical properties of the sample were characterized by X-ray diffraction, scanning electron microscopy, galvanostatically discharge/discharge and cyclic voltammetry techniques, respectively. X-ray diffraction patterns showed that β-LiVOPO4 has an orthorhombic structure with space group of Pnma. The discharge capacity of LiVOPO4 sample is 89.9 mAh•g-1 in the first cycle, and in the 50th cycle it is 76.2 mAh•g-1 at the current density of 10 mA•g-1 between 3.0-4.5 V. The chemical diffusion coefficient ( ) value determined from CV is about 10-11 cm2 s-1. Experimental results indicate that further efforts are needed to improve electrochemical performances of LiVOPO4 material synthesized by solid state method; however, it has a higher discharge plateau around 3.9 V.

scholarly journals ENHANCEMENT OF Li–ION BATTERY CAPACITY USING NICKEL DOPED LiFePO4 AS CATHODE MATERIAL

2018 ◽  
Vol 55 (1B) ◽  
pp. 276
Author(s):  
La Thi Hang
Keyword(s):  
Cathode Material ◽  
Lithium Ion ◽  
Nitrogen Atmosphere ◽  
Electrochemical Performances ◽  
X Ray Diffraction ◽  
X Ray ◽  
Battery Capacity ◽  
Li Ion ◽  
Doped Materials ◽  
Synthesized Materials

Selective supervalent cations (M = Ni, Mn, La etc.) doped LiFePO4 (LFP) is an effective route to enhance its electrical conductivity, thereby improving electrochemical performances of lithium–ion batteries. For this purpose, nickel doped LiFePO4 based cathode material was investigated at different substitution amounts (xNi = 0.05, 0.10). LiFe1–xNixPO4 (LFNP) was synthesized from Ni(NO3)2.6H2O, LiOH.H2O, FeSO4.7H2O, H3PO4, and ascorbic acid precursors via solvothermal technique, followed by calcination in nitrogen atmosphere at 550 °C for 5 h. The structure and morphology of synthesized materials were examined by X–ray diffraction, Scanning electronic microscopy and Raman vibrational micro–spectroscopy. The electrochemical performances of doped materials were studied in Swagelok–type cell using LiPF6/EC–DMC (1:1) as electrolyte. LiFe1–xNixPO4 was shown to exhibit homogenous particles size of 50 ¸ 150 nm. The doped materials were titrated to quantify iron and nickel contents in samples. As anticipated, the electrochemical performances of LiFe1–xNixPO4were significantly enhanced compared to those of undoped LiFePO4.

scholarly journals Zn-Doped LiNi1/3Co1/3Mn1/3O2Composite as Cathode Material for Lithium Ion Battery: Preparation, Characterization, and Electrochemical Properties

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Han Du ◽  
Yuying Zheng ◽  
Zhengjie Dou ◽  
Hengtong Zhan
Keyword(s):  
Cathode Material ◽  
Electrochemical Properties ◽  
Sol Gel ◽  
Lithium Ion ◽  
Constant Current ◽  
Electrode Polarization ◽  
X Ray Diffraction ◽  
Initial Charge ◽  
Constant Current Charge ◽  
Charge Discharge

Zn-doped LiNi1/3Co1/3Mn1/3O2composite, Li(Ni1/3Co1/3Mn1/3)1–xZnxO2(x= 0.02; 0.05; 0.08), is synthesized by the sol-gel method. The crystal structure, morphology, and electrochemical performance are investigated via X-ray diffraction (XRD), scanning electron microscope (SEM), cyclic voltammetry (CV), and constant current charge/discharge experiment. The result reveals that Zn-doping cathode material can reach the initial charge/discharge capacity of 188.8/162.9 mAh·g−1for Li(Ni1/3Co1/3Mn1/3)0.98Zn0.02O2and 179.0/154.1 mAh·g−1for Li(Ni1/3Co1/3Mn1/3)0.95Zn0.05O2with the high voltage of 4.4 V at 0.1 C. Furthermore, the capacity retention of Li(Ni1/3Co1/3Mn1/3)0.98Zn0.02O2is 95.1% at 0.5 C after 50 cycles at room temperature. The improved electrochemical properties of Zn-doped LiNi1/3Co1/3Mn1/3O2are attributed to reduced electrode polarization, enhanced capacity reversibility, and excellent cyclic performance.

Study of Structural Changes in LiNi0.8Co0.1Mn0.1O2 Cathode Material for Lithium-Ion Batteries by X-Ray Diffraction Analysis in the In Situ Mode

2019 ◽  
Vol 92 (7) ◽  
pp. 1013-1019 ◽  
Author(s):  
P. A. Novikov ◽  
A. E. Kim ◽  
K. A. Pushnitsa ◽  
Wang Quingsheng ◽  
M. Yu. Maksimov ◽  
...  
Keyword(s):  
Cathode Material ◽  
Diffraction Analysis ◽  
Lithium Ion Batteries ◽  
Structural Changes ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
X Ray

Electrochemical Properties of Li0.99Gd0.01FePO4/C Composite Cathode for Lithium-Ion Batteries

2010 ◽  
Vol 146-147 ◽  
pp. 1233-1237
Author(s):  
Bin Sun ◽  
Yi Feng Chen ◽  
Kai Xiong Xiang ◽  
Wen Qiang Gong ◽  
Han Chen
Keyword(s):  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Composite Cathode ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrochemical Tests ◽  
Capacity Loss ◽  
Lattice Doping ◽  
Scanning Electron

Li0.99Gd0.01FePO4/C composite was prepared by solid-state reaction, using particle modification with amorphous carbon from the decomposition of glucose and lattice doping with supervalent cation Gd3+. All samples were characterized by X-ray diffraction, scanning electron microscopy, multi-point Brunauer Emmett and Teller methods. The electrochemical tests show Li0.99Gd 0.01FePO4/C composite obtains the highest discharge specific capacity of 154 mAh.g-1 at C/10 rate and the best rate capability. Its specific capacity reaches 131 mAh.g-1 at 2 C rate. Its capacity loss is only 14.9 % when the rate varies from C/10 to 2 C.

Cathode Material Li [Li0.2 Mn0.44Ni0.18Co0.18]O2 Synthesized by Molten Salt Method

2013 ◽  
Vol 690-693 ◽  
pp. 981-984
Author(s):  
Guang Xin Fan ◽  
Hui Lian Li ◽  
Shu Pu Dai ◽  
Chuan Xiang Zhang ◽  
Xue Mao Guan ◽  
...  
Keyword(s):  
Molten Salt ◽  
Specific Area ◽  
Constant Current ◽  
Molar Ratio ◽  
Molten Salt Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Molar Ratios ◽  
Structures And Properties ◽  
Constant Current Charge

In this paper, LiOH·H2O and Li2CO3, which were widely used in industry and (Mn0.533Co0.233Ni0.233) (OH)2prepared by ourselves selected as starting materials, series materials of lithium-rich layered material Li [Li0.2Mn0.44Ni0.18Co0.18]O2were obtained by a molten salt method. Their structures and properties of the materials were investigated by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) and constant current charge/discharge methods. The effects of different LiOH and Li2CO3molar ratios on the Li [Li0.2Mn0.44Ni0.18Co0.18]O2structures and properties were characterized. The results of the experiments indicate that The structures of the material such as crystal structure, the specific area, particle size distribution, tap densities were controlled by adjusting the proportion of the two lithium sources. Forthermore , when the molar ratio of LiOH and Li2CO3was 3:7, the maximum discharge capacity (214.77 mAhg-1) of the cathode was obtained.

Facile Synthesis of Tremella-Like Li3V2(PO4)3/C Composite Cathode Materials Based on Oroxylum for Use in Lithium-Ion Batteries

2020 ◽  
Vol 20 (3) ◽  
pp. 1962-1967
Author(s):  
Zhen Liu ◽  
Wei Zhou ◽  
Guilin Zeng ◽  
Yuling Zhang ◽  
Zebin Wu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Cathode Materials ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Composite Cathode ◽  
Potential Range ◽  
X Ray Diffraction ◽  
Immersion Method ◽  
X Ray ◽  
Transmission Electron

Oroxylum as a traditional Chinese medicine, was used as a green and novel bio-template to synthesize tremella-like Li3V2(PO4)3/C composite (LVPC) cathode materials by adopting a facile immersion method. The microstructures were analyzed by X-ray diffraction analysis, scanning electron microscopy, and transmission electron microscopy. The electrochemical properties were investigated by galvanostatic charge–discharge experiments. The LVPC revealed specific capacity of 95 mAh·g-1 at 1 C rate within potential range of 3.0–4.3 V. After 100 cycles at 0.2 C, the retention of discharge capacity was 96%. The modified electrochemical performance is mainly resulted from the distinct tremella-like structure.

scholarly journals SYNTHESIS OF Ag2O/CNTs NANOCOMPOSITE TO BE USED AS A CATHODE MATERIAL FOR ZINC - SILVER BATTERIES

2018 ◽  
Vol 56 (2A) ◽  
pp. 149-155
Author(s):  
Nguyen Van Tu
Keyword(s):  
Cathode Material ◽  
Photoelectron Spectroscopy ◽  
Chemical Reduction ◽  
Specific Capacity ◽  
X Ray Diffraction ◽  
Interpenetrating Network ◽  
High Specific Capacity ◽  
X Ray ◽  
Transmission Electron ◽  
Good Cycling Stability

In this article, Ag2O/carbon nanotubes (CNTs) nanocomposite has been prepared by chemical reduction method and used as a cathode material for zinc-silver batteries. The transmission electron microscopy (TEM) tests reveal the CNTs and Ag2O nanotubes form an interpenetrating network structure. The X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis confirmed that the Ag2O shows Cubic (Pn-3) crystal structure and mixture element states in the nanocomposite. The charging/discharging property of the Ag2O/CNTs nanocomposite was studied by galvanostatic charge-discharge measurement as a cathode material. The results indicated that Ag2O/CNTs nanocomposite has high specific capacity and good cycling stability. For the current density of 0.53 mA/cm2 (2.5C), the initial specific capacity of the nanocomposite is 190 mAh/g and remains 172 mAh/g after 20 cycles. 

Synthesis of MoO3/V2O5/C Composite as Novel Anode for Li-Ion Battery Application

2020 ◽  
Vol 20 (5) ◽  
pp. 2911-2916
Author(s):  
Zhen Zhang ◽  
Xiao Chen ◽  
Guangxue Zhang ◽  
Chuanqi Feng
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Li Ion Battery ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Li Ion ◽  
Battery Application

The MoO3/V2O5/C, MoO3/C and V2O5/C are synthesized by electrospinning combined with heat treatment. These samples are characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy and thermogravimetric analysis (TG) techniques. The results show that sample MoO3/V2O5/C is a composite composed from MoO3, V2O5 and carbon. It takes on morphology of the nanofibers with the diameter of 200~500 nm. The TG analysis result showed that the carbon content in the composite is about 40.63%. Electrochemical properties for these samples are studied. When current density is 0.2 A g−1, the MoO3/V2O5/C could retain the specific capacity of 737.6 mAh g−1 after 200 cycles and its coulomb efficiency is 92.99%, which proves that MoO3/V2O5/C has better electrochemical performance than that of MoO3/C and V2O5/C. The EIS and linear Warburg coefficient analysis results show that the MoO3/V2O5/C has larger Li+ diffusion coefficient and superior conductivity than those of MoO3/C or V2O5/C. So MoO3/V2O5/C is a promising anode material for lithium ion battery application.

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