Electrochemical Performance of Li3V2 (PO4)3/C Cathode Material Prepared by Soft Chemistry Route

2010 ◽  
Vol 129-131 ◽  
pp. 521-525 ◽  
Author(s):  
Feng Wang ◽  
Feng Wu ◽  
Chuan Wu ◽  
Ying Bai ◽  
Lian Wang
Keyword(s):  
Electrochemical Performance ◽  
Cathode Material ◽  
Electrochemical Impedance ◽  
Chemical Diffusion ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
High Rate ◽  
Chemical Diffusion Coefficient ◽  
X Ray Diffraction ◽  
Soft Chemistry

Monoclinic Li3V2 (PO4)3/C cathode material has been synthesized by soft chemistry route and the electrochemical performance of this material was investigated. The structure of the particles was characterized by X-ray diffraction (XRD). The Li3V2 (PO4)3/C composite exhibits good cycling performance and excellent rate capabilities when cycled between 3.0 and 4.3 V. At 1C rate, the cell displays a reversible capacity of 117 mAh/g and retains 98.1 % of its initial discharge capacity after 50 cycles. At the high rate of 5C, the capacity could reach 109 mAh/g, corresponding to 93 % of that at 0.5C. Electrochemical impedance spectroscopy (EIS) technique was used to analyze the chemical diffusion coefficient of Li.

Fast Microwave Synthesis Lithium Vanadium Phosphate Using Peg as a Novel Carbon Source

2012 ◽  
Vol 455-456 ◽  
pp. 884-888
Author(s):  
Ji Yan ◽  
Zhi Yuan Tang ◽  
Hui Xia Ren ◽  
Li Ma
Keyword(s):  
Carbon Source ◽  
Cathode Material ◽  
Microwave Synthesis ◽  
Electrochemical Impedance ◽  
Cycling Performance ◽  
Lithium Vanadium Phosphate ◽  
X Ray Diffraction ◽  
Vanadium Phosphate ◽  
Electrochemical Tests ◽  
Discharge Test

The Li3V2(PO4)3/C cathode material is prepared by fast microwave synthesis route using PEG as carbon source. The samples were characterized by X-ray diffraction (XRD), galvanostatically charge/discharge test and electrochemical impedance spectroscopy (EIS). XRD result shows that the material was well crystallized and the structure was indexed as a monoclinic Li3V2(PO4)3/C. The electrochemical tests of material exhibit good cycling performance, which delivered a high initial discharge of 125.2 mAh g-1 at 0.2C and the retention of capacity was 92.4% after 50 cycles. From this study, the PEG-based microwave preparation method is regarded as a feasible route for the preparation of Li3V2(PO4)3/C cathode material.

Electrochemical Performance Cr Doped Spinel LiMn2O4 Cathode for Lithium Ion Batteries

2014 ◽  
Vol 636 ◽  
pp. 49-53
Author(s):  
Si Qi Wen ◽  
Liang Chao Gao ◽  
Jia Li Wang ◽  
Lei Zhang ◽  
Zhi Cheng Yang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Cycle Performance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Discharge Test

To improve the cycle performance of spinel LiMn2O4as the cathode of 4 V class lithium ion batteries, spinel were successfully prepared using the sol-gel method. The dependence of the physicochemical properties of the spinel LiCrxMn2-xO4(x=0,0.05,0.1,0.2,0.3,0.4) powders powder has been extensively investigated by using X-ray diffraction (XRD), scanning electron microscope (SEM), charge-discharge test and electrochemical impedance spectroscopy (EIS). The results show that as Mn is replaced by Cr, the initial capacity decreases, but the cycling performance improves due to stabilization of spinel structure. Of all, the LiCr0.2Mn1.8O4has best electrochemical performance, 107.6 mAhg-1discharge capacity, 96.1% of the retention after 50 cycles.

AN EXFOLIATED VANADIUM PENTOXIDE NANOPLATELET AND ITS ELECTROCHEMICAL PROPERTIES FOR LITHIUM-ION BATTERIES

2012 ◽  
Vol 05 (01) ◽  
pp. 1250019 ◽  
Author(s):  
JIE YANG ◽  
ZHAOHUI LI ◽  
JINGLIANG WANG ◽  
QIZHEN XIAO ◽  
GANGTIE LEI ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Vanadium Pentoxide ◽  
Room Temperature ◽  
Sol Gel ◽  
Lithium Ion ◽  
Chemical Diffusion ◽  
Cycling Performance ◽  
Chemical Diffusion Coefficient ◽  
Potential Range ◽  
X Ray Diffraction

A novel vanadium pentoxide (V2O5) nanoplatelet has been prepared by an oxalic acid assisted sol–gel method using β-cyclodextrin as an exfoliation agent followed by sintering at a high temperature. Crystal structure and morphology are analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Due to about 10 nm thick, the product shows a large chemical diffusion coefficient of Li+ ions over 10-10 cm2 s-1 at room temperature. In the potential range of 4.0–2.0 V (vs. Li/Li+ ), it can deliver an initial capacity of 291 mAh g-1 at 0.1 C rate, which equals approximately to the theoretic one. It also shows excellent rate ability and good cycling performance at room temperature. The primary results suggest this two-dimensional nanomaterial could be developed into a promising cathode material for lithium-ion batteries.

scholarly journals Enhanced electrochemical performance of RuO2 doped LiNi1/3Mn1/3Co1/3O2 cathode material for Lithium-ion battery

2021 ◽  
Author(s):  
K. Kalaiselvi ◽  
S. Premlatha ◽  
M. Raju ◽  
Paruthimal Kalaignan Guruvaiah
Keyword(s):  
Electrochemical Performance ◽  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
High Discharge Capacity ◽  
Nitrate Precursor

Abstract LiNi1/3Mn1/3Co1/3O2 as a promising cathode material for lithium-ion batteries was synthesized by a sol-gel method using nitrate precursor calcined at 800°C for 10 hours. The crystallite nature of samples is confirmed from X-ray diffraction analysis. SEM and TEM analyses were used to investigate the surface morphology of the prepared samples. It was found that, highly crystalline polyhedral RuO2 nanoparticles are well doped on the surface of pristine LiNi1/3Mn1/3Co1/3O2 with a size of about approximately 200 nm. The chemical composition of the prepared samples was characterized by EDX and XPS analyses. The electrochemical performance of the proposed material was studied by cyclic voltammetry and charge/discharge analyses. The electrode kinetics of the samples was studied by electrochemical impedance spectroscopy. The developed RuO2 doping may provide an effective strategy to design and synthesize the advanced electrode materials for lithium ion batteries. The doping strategy has dramatically increased the capacity retention from 74 % to 90% with a high discharge capacity of 251.2 mAhg− 1. 3 % RuO2-doped LiNi1/3Mn1/3Co1/3O2 cathode materials have showed the similar characteristics of two potential plateaus obtained at 2.8 and 4.2 V compared with un doped electrode cathode material. These results revealed the enhanced performance of RuO2- doped LiNi1/3Mn1/3Co1/3O2 during insertion and extraction of lithium ions compared to pristine material.

Effect of Nano TiO2 Coating on Electrochemical Performance of the Li1.2Mn0.6Ni0.2O2 Cathode Materials

2014 ◽  
Vol 1035 ◽  
pp. 361-365 ◽  
Author(s):  
Jian Chen LI ◽  
Sheng Li Pang ◽  
Xiang Qian Shen ◽  
Xiao Ming Xi ◽  
Da Qian Liao
Keyword(s):  
Electron Microscopy ◽  
Electrochemical Performance ◽  
Cathode Material ◽  
Electrochemical Techniques ◽  
Cycling Performance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Structure Surface ◽  
Bulk Structure

In this paper, a Li-rich cathode material Li1.2Mn0.6Ni0.2O2is modified by the nanoscale TiO2coating using a simple and controllable hydrolyzation method. The effect of nanoscale TiO2coating on the bulk structure, surface morphology and electrochemical performance are characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and electrochemical techniques, respectively. The results show that the nanosize TiO2can be well coated on the surface of the cathode material. The coating layers have no influence on the bulk structure of the cathode material, while they can improve the initial discharge capacity, columbic efficiency and cycling performance.

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.

Co-Effect of AlF3 and MgF2 Coating on the Electrochemical Performance of LiNi1/3Co1/3Mn1/3O2 Cathode Material under High Voltage

2015 ◽  
Vol 1088 ◽  
pp. 327-331
Author(s):  
Fei Fei Zhao ◽  
Dao Bin Mu ◽  
Xiong Xiong Hou ◽  
Lei Wang ◽  
Yong Huan Ren ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Cathode Material ◽  
Electrochemical Impedance ◽  
Impedance Spectra ◽  
X Ray Diffraction ◽  
Electrochemical Impedance Spectra ◽  
X Ray ◽  
Interface Charge ◽  
Interface Charge Transfer ◽  
Charge Discharge

AlF3 and MgF2 were applied to modify the surface of the LiNi1/3Co1/3Mn1/3O2 cathode material. The structural and electrochemical properties of the materials were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), charge–discharge tests and electrochemical impedance spectra (EIS). The results show that the 1 wt.% AlF3 and 1 wt.% MgF2 coated LiNi1/3Co1/3Mn1/3O2 (NCM333) cathode material exhibits an optimized electrochemical performance. It presents an initial capacity of 207.2mAh/g and 169.1mAh/g at 0.2C between 2.8V and 4.7V after charge-discharge 65 cycles. The rate performance is also enhanced because the coating decreases the interface charge transfer impedance.

A facile method of improving the high rate cycling performance of LiNi 1/3 Co 1/3 Mn 1/3 O 2 cathode material

2016 ◽  
Vol 686 ◽  
pp. 267-272 ◽  
Author(s):  
Qin Wang ◽  
Na Tian ◽  
Ke Xu ◽  
Liyuan Han ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Cathode Material ◽  
Cycling Performance ◽  
High Rate

Synthesis and Electrochemical Performance of SnO2/Graphene Hybrid Anode for Lithium Ion Batteries

2013 ◽  
Vol 1540 ◽  
Author(s):  
Chia-Yi Lin ◽  
Chien-Te Hsieh ◽  
Ruey-Shin Juang
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Anode Material ◽  
High Performance ◽  
Coulombic Efficiency ◽  
Rate Capability ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
Homogeneous Distribution

ABSTRACTAn efficient microwave-assisted polyol (MP) approach is report to prepare SnO2/graphene hybrid as an anode material for lithium ion batteries. The key factor to this MP method is to start with uniform graphene oxide (GO) suspension, in which a large amount of surface oxygenate groups ensures homogeneous distribution of the SnO2 nanoparticles onto the GO sheets under the microwave irradiation. The period for the microwave heating only takes 10 min. The obtained SnO2/graphene hybrid anode possesses a reversible capacity of 967 mAh g-1 at 0.1 C and a high Coulombic efficiency of 80.5% at the first cycle. The cycling performance and the rate capability of the hybrid anode are enhanced in comparison with that of the bare graphene anode. This improvement of electrochemical performance can be attributed to the formation of a 3-dimensional framework. Accordingly, this study provides an economical MP route for the fabrication of SnO2/graphene hybrid as an anode material for high-performance Li-ion batteries.

Synthesis, Characterization and Electrochemical Performance of Li2Mn0.7Fe0.3SiO4 Prepared from Solid-state Reaction

2009 ◽  
Vol 620-622 ◽  
pp. 17-20 ◽  
Author(s):  
Wen Gang Liu ◽  
Yun Hua Xu ◽  
Rong Yang
Keyword(s):  
Solid State ◽  
Electrochemical Performance ◽  
Cathode Material ◽  
Solid State Reaction ◽  
High Capacity ◽  
Reversible Capacity ◽  
Solid State Reaction Method ◽  
Cycle Life ◽  
Solution Route ◽  
Better Than

Li2MSiO4(M=Mn, Co, Ni) is a potential high capacity cathode material because of its outstanding properties that exchange of two electrons per transition metal atom is possible and the theoretical capacity of Li2MSiO4 can reach as high as 330 mAhg-1. In this family, the cathode performance of Li2MnSiO4 synthesized by solution route has been published recently. However, it seems that the cycle life of Li2MnSiO4 fell short of our expectation. In this work, the Li2Mn0.7Fe0.3SiO4 cathode material was synthesized by traditional solid-state reaction method. The prepared powder was consisted of majority of Li2Mn0.7Fe0.3SiO4 and minor impurities which were examined by XRD. FESEM morphology showed that the products of Li2Mn0.7Fe0.3SiO4 and Li2MnSiO4 have similar particle size (about 50-300 nm). The electrochemical performance of Li2Mn0.7Fe0.3SiO4, especially for reversible capacity and cycle life, exhibited better than those of Li2MnSiO4.

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