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.

β-Cyclodextrin coated lithium vanadium phosphate as novel cathode material for lithium ion batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (105) ◽  
pp. 103364-103371 ◽  
Author(s):  
Renjie Chen ◽  
Jingning Lai ◽  
Yuejiao Li ◽  
Meiling Cao ◽  
Shi Chen ◽  
...  
Keyword(s):  
Carbon Source ◽  
Cathode Material ◽  
Lithium Ion Batteries ◽  
High Capacity ◽  
Lithium Ion ◽  
Lithium Vanadium Phosphate ◽  
Phase Method ◽  
Rate Performance ◽  
Cycle Stability ◽  
Vanadium Phosphate

As a new carbon source, β-cyclodextrin was used to synthesize a Li3V2(PO4)3/C cathode material for LIB via a rheological phase method. The sample showed high capacity, good rate performance and cycle stability, and low resistance.

Synthesis and Characterization of Gradient Cathode Material for Lithium-Ion Batteries

2011 ◽  
Vol 391-392 ◽  
pp. 1435-1439
Author(s):  
Tao Dong ◽  
Li Peng Zhang ◽  
Xian Jin Yu ◽  
Zeng Dian Zhao ◽  
Yun Hui Dong
Keyword(s):  
Cathode Material ◽  
Discharge Capacity ◽  
Electrochemical Impedance ◽  
Lithium Ion ◽  
Gradient Material ◽  
X Ray Diffraction ◽  
Capacity Retention ◽  
Electronic Microscope ◽  
Discharge Test

Gradient cathode material of LiNi0.7Co0.15Mn0.15O2 was synthesized by mixing hydroxide co-precipitated precursors with 8% excess LiOH•H2O. Structure and electrochemical properties of the material was characterized by X-ray diffraction (XRD), scanning electronic microscope (SEM), galvanostatic charge-discharge test and electrochemical impedance spectroscopy (EIS). The results indicate that the typical crystal of the material is α-NaFeO2. The particles are formed by 200nm~500nm crystals. The gradient material sintered at 800°C shows the best electrochemical performance, the initial discharge capacity of the material is 164.45mAh•g-1 at 0.2C, its discharge capacity retention of 86% at 2C and with lower electrochemical impedance.

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.

Effects of the Pre-Freezing Time on the Structures and Electrochemical Performances of Co-B Alloys

2011 ◽  
Vol 391-392 ◽  
pp. 1085-1089 ◽  
Author(s):  
Chuan Wu ◽  
Chun Hui Pang ◽  
Feng Wu ◽  
Ying Bai ◽  
Chi Chen ◽  
...  
Keyword(s):  
Cycling Performance ◽  
Area Measurement ◽  
Bet Surface Area ◽  
Electrochemical Performances ◽  
Freezing Time ◽  
Drying Method ◽  
X Ray Diffraction ◽  
Surface Area Measurement ◽  
A Current ◽  
Discharge Test

A series of Co-B alloys with uniform nanoparticles were prepared via a vacuum freeze-drying method, which the precursors of Co-B alloys were prepared by the reduction of bivalent cobalt chloride with aqueous sodium borohydride solution. The alloys were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and brunauer emmett teller (BET) surface area measurement. The electrochemical activities of Co-B samples were examined by charge-discharge test. This work studied the influence of pre-freezing time on the microstructure and electrochemical performance. The sample pre-freezing for 3 hours exhibits the best cycling performance than others, the discharge capacity increase to its maximum 438mAh/g, and it still remained 232 mAh/g after 60 cycles at a current of 50 mAh/g; while those of samples pre-freezing for 1 hour and 5 hours are 399 mAh/g and 413mAh/g, respectively.

Lithium vanadium phosphate as cathode material for lithium ion batteries

Ionics ◽  
2015 ◽  
Vol 21 (5) ◽  
pp. 1201-1239 ◽  
Author(s):  
Du Tao ◽  
Shengping Wang ◽  
Yongchao Liu ◽  
Yu Dai ◽  
Jingxian Yu ◽  
...  
Keyword(s):  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Lithium Vanadium Phosphate ◽  
Vanadium Phosphate
Sign in / Sign up

Export Citation Format

Share Document