scholarly journals Synthesis and Characterization ofLiNi0.7–xMgxCo0.3O2(0≤x≤0.1) Cathode Materials for Lithium-Ion Batteries Prepared by a Sol-Gel Method

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Hailang Zhang
Keyword(s):  
Cathode Materials ◽  
Sol Gel ◽  
Lithium Ion ◽  
Magnesium Content ◽  
Temperature Cycling ◽  
Structure Stability ◽  
Gel Method ◽  
Sol Gel Method ◽  
Mg Doping ◽  
Charge Discharge

Prospective cathode materialsLiNi0.7–xMgxCo0.3O2(0≤x≤0.1) for a lithium-ion secondary battery were synthesized using a sol-gel method. The structural and electrochemical properties were examined by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry(CV), and charge-discharge tests. The results show that theLiNi0.7–xMgxCo0.3O2maintains theα-NaFeO2type layered structure regardless of the magnesium content in the rangex⩽0.1. On the other hand, Mg-doping improves the capacity retention well. Besides, the Mg-doping promotes the diffusion of Li+in LiNi0.7Co0.3O2. Moreover, Mg-doping suppresses the phase transitions that usually occur in LiNiO2during cycling and improves the charge-discharge reversibility of Li/LiNi0.7Co0.3O2. High temperature cycling performance of the cathode at 55.5°C is also improved by Mg-doping, which is possibly attributed to the total stronger metal-oxygen bonding and the enhanced structure stability of those delithiated Mg-doped cathodes during cycling.

FACILE SOL–GEL SYNTHESIS OF Li[Li0.2Mn0.56Ni0.16Co0.08]O2 AS IMPROVED CATHODE MATERIAL FOR LITHIUM-ION BATTERIES

2013 ◽  
Vol 01 (04) ◽  
pp. 1340015
Author(s):  
WENJUAN HAO ◽  
HAN CHEN ◽  
YANHONG WANG ◽  
HANHUI ZHAN ◽  
QIANGQIANG TAN ◽  
...  
Keyword(s):  
Cathode Materials ◽  
Sol Gel ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Electrochemical Performances ◽  
Acetate Tetrahydrate ◽  
Li Ion Batteries ◽  
Gel Method ◽  
Sol Gel Method ◽  
Li Ion

Li [ Li 0.2 Mn 0.56 Ni 0.16 Co 0.08] O 2 cathode materials for Li -ion batteries were synthesized by a facile sol–gel method followed by calcination at various temperatures (700°C, 800°C and 900°C). Lithium acetate dihydrate, manganese (II) acetate tetrahydrate, nickel (II) acetate tetrahydrate and cobalt (II) acetate tetrahydrate are employed as the metal precursors, and citric acid monohydrate as the chelating agent. For the obtained Li [ Li 0.2 Mn 0.56 Ni 0.16 Co 0.08] O 2 materials, the metal components existed in the form of Mn 4+, Ni 2+ and Co 3+, and their molar ratio was in good agreement with 0.56 : 0.16 : 0.08. The calcination temperature played an important role in the particle size, crystallinity and further electrochemical properties of the cathode materials. The Li [ Li 0.2 Mn 0.56 Ni 0.16 Co 0.08] O 2 material calcined at 800°C for 6 h showed the best electrochemical performances. Its discharge specific capacities cycled at 0.1 C, 0.5 C, 1 C and 2 C rates were 266.0 mAh g−1, 243.1 mAh g−1, 218.2 mAh g−1 and 192.9 mAh g−1, respectively. When recovered to 0.1 C rate, the discharge specific capacity was 260.2 mAh g−1 and the capacity loss is only 2.2%. This work demonstrates that the sol–gel method is a facile route to prepare high performance Li [ Li 0.2 Mn 0.56 Ni 0.16 Co 0.08] O 2 cathode materials for Li -ion batteries.

scholarly journals SYNTHESIS AND CHARACTERIZATION OF Li4Ti5O12 WITH SOL GEL METHOD AS A LITHIUM ION-BATTERY ANODE MATERIAL

2019 ◽  
Vol 20 (2) ◽  
pp. 67
Author(s):  
Slamet Priyono ◽  
Ilma Nuroniah ◽  
Achmad Subhan ◽  
Edi Sanjaya ◽  
Bambang Prihandoko
Keyword(s):  
Electrical Conductivity ◽  
Sol Gel ◽  
Lithium Ion ◽  
Synthesis And Characterization ◽  
Optimum Temperature ◽  
Gel Method ◽  
Sol Gel Method ◽  
Battery Anode ◽  
Charge Discharge

SYNTHESIS AND CHARACTERIZATION OF Li4Ti5O12 WITH SOL GEL METHOD AS A LITHIUM ION-BATTERY ANODE MATERIAL. Synthesis of anode Li4Ti5O12 material has been carried out using the sol gel method. The synthesis is carried out with variations in sintering temperatures at 500 oC, 600 oC, 700 oC dan 800 oC. Characterization carried out includes testing thermal analysis to determine the optimum temperature for sintering, XRD (X-ray Diffraction) to find out the phase formation of Li4Ti5O12, Scanning electron microscope (SEM) to analyse the morphology formed, testing Cyclic voltammetry, charge-discharge and Electrochemical Impedance Spectroscopy (EIS) is carried out to find out the elec- trochemical performance. From the results of characterization of thermal and XRD analyses, the optimum temperature for synthesis is 800oC with small impurity content. The results of SEM characterization show that the morphology of the sample is not homogeneous, and the particles are agglomerated. The resulting electrochemical performance increases along with the increase in temperature for sintering, including voltammogram graphs, diffusion coefficient values, electrical conductivity and charge-discharge capacity. Of all the samples, the LTO sintered at 800oC shows good electrochemical performance with a sharp and good voltammogram graph, diffusion coefficient value of lithium ion is 1.58 × 10-9 cm2s-1, electrical conductivity of 0.6282 S/cm and the discharge capacity given is 78,07 mAh/g.

Preparation and Electrochemical Performance of Li3V2(PO4)3 Cathode Materials by Microwave-Heated Sol-Gel Method

2010 ◽  
Vol 156-157 ◽  
pp. 1219-1222 ◽  
Author(s):  
Bo Quan Jiang ◽  
Shu Fen Hu ◽  
Min Wei Wang
Keyword(s):  
Electrochemical Performance ◽  
Cathode Materials ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Lithium Vanadium Phosphate ◽  
Optimal Conditions ◽  
Gel Method ◽  
Sol Gel Method

The lithium vanadium phosphate (Li3V2(PO4)3 solid cathode materials were synthesized by microwave-heated sol-gel method using lithium hydroxide, ammonium metavanadate, phosphate and citric acid as starting materials. The test was conducted with orthogonal experiment method. The optimal conditions for (Li3V2(PO4)3 synthesis were determined to be microwave heating time of 10 min, microwave power of 700 W, Li/V molar ratio of 3.05:2.0 and pH value(gel solution) of 7.0. The synthesized (Li3V2(PO4)3 under the optimal conditions demonstrated perfect crystal growth and good electrochemical performance with initial charge/discharge specific capacity of 172.42 mAh·g-1/154.93 mAh·g-1 and discharge decay rate of 2.25 % after 50 cycles. The lithium ion diffusion coefficient was determined to be 1.434 ×10-8 cm2·s-1 by electrochemical impedance spectroscopy and mathematical models derived from simulative equivalent circuit.

Optimized Synthetic Conditions of 0.6Li2MnO3·0.4LiNi1/3Co1/3Mn1/3O2 Cathode Materials for Lithium Batteries via Sol-Gel Method

2016 ◽  
Vol 852 ◽  
pp. 908-915
Author(s):  
Yu Feng Song ◽  
Ying Ying Liu ◽  
Lei Lei Cui ◽  
Xiao Wei Miao ◽  
Hong Bin Zhao ◽  
...  
Keyword(s):  
Discharge Capacity ◽  
Cathode Materials ◽  
Electrode Materials ◽  
Layer Structure ◽  
Sol Gel ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Discharge Test

Li-rich layer-structure 0.6Li2MnO3·0.4LiNi1/3Co1/3Mn1/3O2 (LMO) cathode materials have been synthesized by sol-gel method using citric acid as a cheating agent. The effects of different ratios of solvent and the amount of excessive lithium are discussed systematically. When changing the ratio of ethanol/H2O and the amount of excessive lithium, the morphology and electrochemical properties will be changed accordingly. The crystal structure of Li-rich LMO was characterized by X-ray diffraction. The morphology was characterized by scanning electron microscope, and the Li-rich LMO cathodes show bulk with the particle size of around 150 nm. The charge/discharge test showed the Li-rich LMO synthesized with 100% ethanol and 5% Li excess sintered at 900 °C for 24 h subsequently has the best electrochemical performance. Within the cut-off voltage between 2.5 and 4.8 V, the initial discharge capacity is 256.8 mAh g-1 at 0.1 C; and after 50 cycles the discharge capacity remains 230.2 mAh g-1. By modifying the ratio of solvent in the formation of gel, it is promising to extend the synthesis of other electrode materials of lithium ion batteries basing on the traditional sol-gel method.

Synthesis and Characteristics of LiNi0.85Co0.15O2 Cathode Materials by Particulate Sol-Gel Method for Lithium Ion Batteries

2005 ◽  
Vol 23 (5) ◽  
pp. 491-495 ◽  
Author(s):  
Zhu Xian-Jun ◽  
Chen Hong-Hao ◽  
Zhan Hui ◽  
Liu Han-Xing ◽  
Yang Dai-Ling ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
Sol Gel ◽  
Lithium Ion ◽  
Gel Method ◽  
Sol Gel Method

scholarly journals Electrochemical study of doped LiFePO4 as a cathode material for lithium-ion battery

2016 ◽  
Vol 6 (1) ◽  
pp. 1 ◽  
Author(s):  
Andrey Chekannikov ◽  
Svetlana Novikova ◽  
Tatiana Kulova ◽  
Alexander Skundin ◽  
Andrey Yaroslavtsev
Keyword(s):  
Cathode Material ◽  
Lithium Ion Battery ◽  
Sol Gel ◽  
Lithium Ion ◽  
Xrd Analysis ◽  
Electrochemical Study ◽  
Electrode Polarization ◽  
Gel Method ◽  
Sol Gel Method ◽  
Charge Discharge

<p class="PaperAbstract"><span lang="EN-US">LiFe<sub>1-x</sub>VxPO<sub>4</sub>/C (x= 0.01, 0.03, 0.05, 0.1) composites had been obtained by sol-gel method and characterized with the use of the XRD-analysis, SEM and charge/discharge tests. The doping was shown to result in decrease of electrode polarization, and correspondingly in capacity increase at high C-rates.</span></p>

High performance (1 − x)LiMnPO4·xLi3V2(PO4)3/C composite cathode materials prepared by a sol–gel method

RSC Advances ◽  
2015 ◽  
Vol 5 (98) ◽  
pp. 80170-80175 ◽  
Author(s):  
Shanshan Li ◽  
Zhi Su ◽  
Xinyu Wang
Keyword(s):  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
High Performance ◽  
Sol Gel ◽  
Lithium Ion ◽  
Composite Cathode ◽  
Dimethyl Formamide ◽  
Gel Method ◽  
Sol Gel Method ◽  
Dispersing Agent

A series of (1 − x)LiMnPO4·xLi3V2(PO4)3/C (x = 0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1) composite nanoparticles are synthesized as cathode materials for lithium-ion batteries by the sol–gel method, using N,N-dimethyl formamide as a dispersing agent.

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