Influence on Electrochemical Performance of LiMnPO4 by Y Doping Using Low Combustion Synthesis Method

2012 ◽  
Vol 531 ◽  
pp. 411-414
Author(s):  
Zhi Hong Fu ◽  
Xiang Zhu He ◽  
Xin Sun ◽  
Yong Xiu Wang
Keyword(s):  
Combustion Synthesis ◽  
Cathode Materials ◽  
Synthesis Method ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Electrochemical Kinetics ◽  
X Ray Diffraction ◽  
Ion Extraction ◽  
Olivine Structure ◽  
Synthesized Materials

The olivine LiMnPO4 used as cathode materials was synthesized by the low combustion synthesis method, and modified by doping Y. Testing of X-ray diffraction (XRD),scanning electron microscopy (SEM),charge-discharge measurements was carried out for LiMnPO4/C cathode materials and the modified materials. The synthesized materials doping by Y exhibited standard olivine structure, nano-sized particles, discharge capacity of 122.9mAh.g-1 and good cycling performance. These results indicated that less Y doping could improve electrochemical kinetics of lithium ion extraction/insertion and significantly enhanced electrochemical activity.

Flameless Solution Combustion Synthesis of Al3+ Doped LiMn2O4

2011 ◽  
Vol 186 ◽  
pp. 7-10 ◽  
Author(s):  
Gui Yang Liu ◽  
Jun Ming Guo ◽  
Bao Sen Wang ◽  
Ying He
Keyword(s):  
Combustion Synthesis ◽  
Synthesis Method ◽  
Solution Combustion Synthesis ◽  
Xrd Analysis ◽  
Cycling Performance ◽  
X Ray Diffraction ◽  
Solution Combustion ◽  
Electrochemical Test ◽  
Micro Morphology ◽  
Better Than

Single phase Al3+ doped LiMn2O4 has been prepared by flameless solution combustion synthesis method at 600oC for 1h. X-ray diffraction (XRD) and scanning electric microscope (SEM) were used to determine the phase composition and micro morphology of the products. XRD analysis indicates that the purities increase and the lattice parameters of the products decrease with increasing Al3+ content. Electrochemical test indicates that the cycling performance of the products with Al3+ doping are better than that of the product without Al3+ doping. The product LiAl0.10Mn1.90O4 gets the best electrochemical performance. At the current density of 30mA/g, the initial discharge capacity of LiAl0.10Mn1.90O4 is 124.8mAh/g, and after 20 cycles, the capacity retention is more than 89%. SEM investigation indicates that the particles of LiAl0.10Mn1.90O4 are sub-micron in size and well dispersed.

Morphology and Electrical Properties of Nano-Sized LiFePO4 Cathode Materials

2011 ◽  
Vol 295-297 ◽  
pp. 1160-1163
Author(s):  
Hao Yan ◽  
Yun Hua Xu ◽  
Juan Wang ◽  
Chong Yang Shao
Keyword(s):  
Cathode Materials ◽  
Ph Value ◽  
Synthesis Method ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Simple Method ◽  
Design And Synthesis ◽  
And Control ◽  
Cycling Performances ◽  
Discharge Capacities

Nano- and micro-scaled LiFePO4 was synthesized by hydrothermal synthesis method using disodium ethylenediamine tetraacetate (Na2EDTA)-assisted to avoid the Fe(II) ions from oxidation and control the growth of the crystal. The as-synthesized samples were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), The SEM showed that the pH value of the synthesis solution played a key role in the formation of the final products with different morphologies. Charge–discharge cycling performances were used to characterize its electrochemical properties. The results indicated that the nano-sized LiFePO4 presents enhanced discharge capacities (148 mAhg−1 at 0.1C-rate) and stable cycling performance. This study offered a simple method to design and synthesis nano-sized cathode materials for lithium-ion batteries.

IMPROVEMENT ON THE ELECTROCHEMICAL PROPERTIES OF LiMn2O4 BY CODOPING

2010 ◽  
Vol 03 (03) ◽  
pp. 189-191 ◽  
Author(s):  
JUN-FANG WANG ◽  
HAI-LANG ZHANG
Keyword(s):  
Cathode Materials ◽  
Spinel Phase ◽  
Sol Gel ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Constant Current ◽  
Electrochemical Performances ◽  
X Ray Diffraction ◽  
Specific Discharge ◽  
The Stability

The cathode materials Li 1.05 Cr x Mn 1.95-x O 4(x = 0, 0.05, 0.10) for lithium ion batteries were synthesized by sol–gel method and calcined at 650, 700 and 750°C, respectively. The synthesized materials were characterized with X-ray diffraction (XRD). The electrochemical performances of the materials were tested by constant-current cyclic testing at room temperature for 38 cycles. The XRD results showed that the samples of cathode materials synthesized by the method possessed pure spinel phase. The Li1.05Cr0.1Mn1.85O4 powder with better cyclic performance of initial specific discharge capacity of 113.7 mAh ⋅ g-1 can be obtained at the calcination temperature of 700°C for 12 h, with an capacity retention of 95.5% after 38 cycles. It was evident that codoping of Li+ and Cr3+ can improve the stability of spinel structure and cycling performance.

Electrochemical and cycling performance of neodymium (Nd3+) doped LiNiPO4 cathode materials for high voltage lithium-ion batteries

2019 ◽  
Vol 237 ◽  
pp. 224-227 ◽  
Author(s):  
S. Karthickprabhu ◽  
Dhanasekaran Vikraman ◽  
A. Kathalingam ◽  
K. Prasanna ◽  
Hyun-Seok Kim ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
High Voltage ◽  
Cathode Materials ◽  
Lithium Ion ◽  
Cycling Performance

Preparation and Characterization of High-Voltage Cathode Material LiNi0.5Mn1.5O4 for Lithium Ion Batteries

2019 ◽  
Vol 953 ◽  
pp. 121-126
Author(s):  
Zhe Chen ◽  
Quan Fang Chen ◽  
Sha Ne Zhang ◽  
Guo Dong Xu ◽  
Mao You Lin ◽  
...  
Keyword(s):  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
Synthesis Method ◽  
Rate Capability ◽  
Lithium Ion ◽  
Diffusion Path ◽  
High Energy ◽  
High Energy Density ◽  
Charge Discharge

High energy density and rechargeable lithium ion batteries are attracting widely interest in renewable energy fields. The preparation of the high performance materials for electrodes has been regarded as the most challenging and innovative aspect. By utilizing a facile combustion synthesis method, pure nanostructure LiNi0.5Mn1.5O4 cathode material for lithium ion batteries were successfully fabricated. The crystal phase of the samples were characterized by X-Ray Diffraction, and micro-morphology as well as electrochemistry properties were also evaluated using FE-SEM, electrochemical charge-discharge test. The result shows the fabricated LiNi0.5Mn1.5O4 cathode materials had outstanding crystallinity and near-spherical morphologies. That obtained LiNi0.5Mn1.5O4 samples delivered an initial discharge capacity of 137.2 mAhg-1 at the 0.1 C together with excellent cycling stability and rate capability as positive electrodes in a lithium cell. The superior electrochemical performance of the as-prepared samples are owing to nanostructure particles possessing the shorter diffusion path for Li+ transport, and the nanostructure lead to large contact area to effectively improve the charge/discharge properties and the rate property. It is demonstrated that the as-prepared nanostructure LiNi0.5Mn1.5O4 samples have potential as cathode materials of lithium-ion battery for future new energy vehicles.

[email protected] as high-voltage lithium-ion battery cathode materials with improved cycling performance and thermal stability

2019 ◽  
Vol 327 ◽  
pp. 135018 ◽  
Author(s):  
Peipei Pang ◽  
Zheng Wang ◽  
Xinxin Tan ◽  
Yaoming Deng ◽  
Junmin Nan ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Lithium Ion Battery ◽  
High Voltage ◽  
Cathode Materials ◽  
Lithium Ion ◽  
Cycling Performance

Temperature Dependence of LiMn2O4 Prepared by a Solution Combustion Synthesis in the System of Acetate Salts and Acetic Acid

2012 ◽  
Vol 485 ◽  
pp. 465-468
Author(s):  
Li Li Zhang ◽  
Gui Yang Liu ◽  
Jun Ming Guo ◽  
Bao Sen Wang ◽  
Ying He
Keyword(s):  
Acetic Acid ◽  
Combustion Synthesis ◽  
Raw Materials ◽  
Synthesis Method ◽  
Solution Combustion Synthesis ◽  
Electrochemical Performances ◽  
Metal Foil ◽  
X Ray Diffraction ◽  
Solution Combustion ◽  
Acid Ratio

Spinel LiMn2O4 have been prepared by the solution combustion synthesis method using acetate salts as raw materials and acetic acid as fuel. The phase compositions of the as-prepared products were determined by X-ray diffraction (XRD). The electrochemical performance of the products was tested by using a coin-type half battery versus lithium metal foil as anode material. XRD results suggested that the purities of the products prepared at 500oC are higher than these of the products prepared at 600oC. For the products prepared at 500oC, the purities of the products increase with increasing acetic acid ratios. But for the products prepared at 600oC, the purities of the products decrease with increasing acetic acid ratios. The performance tests indicated that the electrochemical performances of the products prepared at 500oC are better than these of the products prepared at 600oC. The product prepared at 500oC with the acetic acid ratio of 1.0 gets the best performance. The initial capacity of it reaches to 124.8mAh/g at the current density of 75mA/g, and after 50 cycles, the capacity retention is 93.7%.

Solution combustion synthesis and electrochemical properties of yttrium-doped LiMnPO4/C cathode materials for lithium ion batteries

2020 ◽  
Vol 38 (9) ◽  
pp. 976-982
Author(s):  
Redouan El Khalfaouy ◽  
Servet Turan ◽  
Miguel A. Rodriguez ◽  
Kamil Burak Dermenci ◽  
Umut Savacı ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Combustion Synthesis ◽  
Cathode Materials ◽  
Lithium Ion ◽  
Solution Combustion Synthesis ◽  
Solution Combustion
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