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.

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.

Synthesis and electrochemical performance of Li4Ti5O12/TiO2/C nanocrystallines for high-rate lithium ion batteries

RSC Advances ◽  
2015 ◽  
Vol 5 (91) ◽  
pp. 74774-74782 ◽  
Author(s):  
Wenjun Zhu ◽  
Hui Yang ◽  
Wenkui Zhang ◽  
Hui Huang ◽  
Xinyong Tao ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Sol Gel ◽  
Lithium Ion ◽  
High Rate ◽  
Gel Method ◽  
Sol Gel Method ◽  
Subsequent Calcination ◽  
Nanocrystalline Composite ◽  
Calcination Treatment

A Li4Ti5O12/TiO2/carbon (Li4Ti5O12/TiO2/C) nanocrystalline composite has been successfully synthesized by a facile sol–gel method and subsequent calcination treatment.

High rate capabilities of Li4Ti5−xVxO12 (0 ≤ x ≤ 0.3) anode materials prepared by a sol–gel method for use in power lithium ion batteries

RSC Advances ◽  
2015 ◽  
Vol 5 (61) ◽  
pp. 49248-49256 ◽  
Author(s):  
Chien-Min Chang ◽  
Yi-Chih Chen ◽  
Wei-Lun Ma ◽  
Yui Whei Chen-Yang
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Anode Materials ◽  
Sol Gel ◽  
Lithium Ion ◽  
High Rate ◽  
Gel Method ◽  
Sol Gel Method ◽  
Performance Results

The electrochemical performance results show that the highest capacities, 208 (0.2 C), 198 (0.5 C), 189 (1 C), 179 (2 C), 157 mA h g−1 (5 C), are obtained from the LTOV06 electrode, which are higher than those of the LTO electrodes reported.

Synthesis of biocarbon coated Li3V2(PO4)3/C cathode material for lithium ion batteries using recycled tea

RSC Advances ◽  
2015 ◽  
Vol 5 (36) ◽  
pp. 28662-28669 ◽  
Author(s):  
Chuanliang Wei ◽  
Wen He ◽  
Xudong Zhang ◽  
Shujiang Liu ◽  
Chao Jin ◽  
...  
Keyword(s):  
Carbon Source ◽  
Electrochemical Performance ◽  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Sol Gel ◽  
Lithium Ion ◽  
Gel Method ◽  
Sol Gel Method ◽  
Structural Template

A biocarbon coated Li3V2(PO4)3 (LVP-C) cathode with high electrochemical performance was synthesized by a sol–gel method using recycled tea as both structural template and carbon source.

Li2MnSiO4/C Composite with Ascorbic Acid as Carbon Source for Lithium Ion Batteries

2014 ◽  
Vol 1033-1034 ◽  
pp. 125-128
Author(s):  
Chun Yan Lai ◽  
Zhen Wang ◽  
Jia Jun Zhu ◽  
Qun Jie Xu
Keyword(s):  
Ascorbic Acid ◽  
Carbon Source ◽  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Discharge Capacity ◽  
Sol Gel ◽  
Lithium Ion ◽  
Gel Method ◽  
Sol Gel Method

Ascorbic acid (VC) was used as carbon source for Li2MnSiO4/C composite synthesized by a sol-gel method. By comparing the electrochemical performance of the Li2MnSiO4/C composite and pure Li2MnSiO4, it was found that VC adding can improve the capacity of Li2MnSiO4. The Li2MnSiO4/C with 10% VC shows a discharge capacity of 212 mAh/g at 0.05C and Li2MnSiO4/C with 15% VC shows discharge capacity of 192 mAh/g at 0.1C, that were higher than the capacity of pure Li2MnSiO4.

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