A multiscale investigation elucidating the structural complexities and electrochemical properties of layered–layered composite cathode materials synthesized at low temperatures

2020 ◽  
Vol 22 (10) ◽  
pp. 5439-5448
Author(s):  
Songyoot Kaewmala ◽  
Narinthorn Wiriya ◽  
Patcharapohn Chantrasuwan ◽  
Visittapong Yordsri ◽  
Wanwisa Limphirat ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Structural Stability ◽  
Cathode Materials ◽  
Low Temperatures ◽  
Composite Cathode ◽  
Layered Composite ◽  
Microstructural Characteristics ◽  
Cooling Rates ◽  
Heating And Cooling ◽  
Composite Cathodes

0.5Li2MnO3·0.5LiCoO2 composite cathodes prepared using various heating and cooling rates under 600 °C reveal different microstructural characteristics that significantly impact their structural stability and electrochemical properties.

Influence of the Preparation Process on the Electrochemical Properties of xLiFePO4·yLi3V2(PO4)3/C Nano-Sized Composite Cathode Materials

2016 ◽  
Vol 680 ◽  
pp. 238-243 ◽  
Author(s):  
Bing Yan ◽  
Peng Zhao Gao ◽  
Dong Yun Li ◽  
Guang Lei Tian
Keyword(s):  
Citric Acid ◽  
Electrochemical Properties ◽  
Cathode Materials ◽  
Retention Rate ◽  
Specific Capacity ◽  
Composite Cathode ◽  
Discharge Process ◽  
Discharge Specific Capacity ◽  
Calcination Temperatures ◽  
Charge Discharge

In this paper, a series of xLiFePO4·yLi3V2(PO4)3/C (x/y = 1:0, 7:1, 5:1, 3:1, 1:1, 1:3 and 0:1, ratio in mol) nano-sized composite cathode materials were successfully prepared via the solid reaction method. Influence of x/y ratio, calcination temperatures and the content of citric acid on the composition, microstructure and electrochemical properties of the materials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and electrochemical measurements, et al. results showed that the xLFP·yLVP/C (x and y ≠ 0) composites were composed of olivine LiFePO4 and monoclinic Li3V2(PO4)3, both of which featured slight structural distortions as the formation of V-doped LFP/C and Fe-doped LVP/C, respectively; With the increase of calcination temperatures, the crystallinity and particles size of the 7LFP·LVP/C composites increased, when calcined at 700°C, the initial charge/discharge specific capacity of the composites reached a maximum value of 145.6 mAh/g, and the voltage drop values between charge/discharge platform possessed the minimum value(0.04 V), suggesting the minimum polarization of the composites in charge/discharge process. Content of citric acid did not affect the compositions of the composites, with the increase of the molar ratio of citric acid to V3+, the discharge specific capacities of 7LFP·LVP/C increased first and then decreased, when it equaled to 1.0:1.0, the discharge specific capacity of the relative composites was 119.18 mAh/g, with a capacity retention rate of 93.9 % after 50 cycles, owning the excellent electrochemical stability.

Electrochemical properties of yolk-shell structured layered-layered composite cathode powders prepared by spray pyrolysis

2014 ◽  
Vol 144 ◽  
pp. 288-294 ◽  
Author(s):  
Jung Hyun Kim ◽  
Yun Chan Kang ◽  
Yun Ju Choi ◽  
Yang Soo Kim ◽  
Jong-Heun Lee
Keyword(s):  
Electrochemical Properties ◽  
Spray Pyrolysis ◽  
Composite Cathode ◽  
Layered Composite
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