scholarly journals The impact of drying temperature on the crystalline domain and the electrochemical performance of NiCoAl-LDH

2022 ◽  
Vol 8 ◽  
pp. 1151-1158
Author(s):  
Gayi Nyongombe ◽  
G.L. Kabongo ◽  
I.T. Bello ◽  
L.L. Noto ◽  
M.S. Dhlamini
2019 ◽  
Vol 22 (1) ◽  
pp. 173-179
Author(s):  
Thanh Dinh Duc ◽  
Anh My-Thi Nguyen ◽  
Tru Nhi Nguyen ◽  
Hang Thi La ◽  
Phung My Loan Le

Introduction: LiFePO4/C composites were synthesized via physical mixing assisted solvothermal process. Different kinds of carbon materials were investigated including 0D (carbon Ketjen black), 1D (carbon nanotubes) and 2D (graphene) materials. X-rays diffraction patterns of carbon coated LiFePO4 synthesized by solvothermal was indexed to pure crystalline phase without the emergence of second phase. LiFePO4 platelets and rods were in range size of 80-200 nm and dispersed well in carbon matrix. The lithium ion diffusion kinetics was evaluated through the calculated diffusion coefficients to explore the impact of carbon mixing. Methods: In this work, we studied the structure, morphologies and the lithium ion diffusion kinetic of LiFePO4/C composites for Li-ion batteries. Different characterization methods were used including powder X-rays (for crystalline structure); Transmission Electron Microscopy (for particle and morphologies observation) and Cyclic voltammetry (for electrochemical kinetic study). Results: The study indicated LiFePO4/C composites were successfully obtained by mixing process and the electrochemical performance throughout the calculated diffusion coefficient was significantly improved by adding the carbon types. Conclusion: The excellent ion diffusion was obtained for composites LiFePO4/Ketjen black (KB) and LiFePO4/CNT compared to LiFePO4/Graphene. KB could be a potential candidate for large-scale production due to low-cost, stable and high electrochemical performance.  


2020 ◽  
Vol 167 (2) ◽  
pp. 020532 ◽  
Author(s):  
Zhipeng Wen ◽  
Yinxin Lin ◽  
Yueying Peng ◽  
Jing Zeng ◽  
Jinbao Zhao

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 842 ◽  
Author(s):  
Yanqing Fu ◽  
Qiliang Wei ◽  
Gaixia Zhang ◽  
Yu Zhong ◽  
Nima Moghimian ◽  
...  

In this work, we investigated three types of graphene (i.e., home-made G, G V4, and G V20) with different size and morphology, as additives to a lithium iron phosphate (LFP) cathode for the lithium-ion battery. Both the LFP and the two types of graphene (G V4 and G V20) were sourced from industrial, large-volume manufacturers, enabling cathode production at low cost. The use of wrinkled and/or large pieces of a graphene matrix shows promising electrochemical performance when used as an additive to the LFP, which indicates that the features of large and curved graphene pieces enable construction of a more effective conducting network to realize the full potential of the active materials. Specifically, compared to pristine LFP, the LFP/G, LFP/G V20, and LFP/G V4 show up to a 9.2%, 6.9%, and 4.6% increase, respectively, in a capacity at 1 C. Furthermore, the LFP combined with graphene exhibits a better rate performance than tested with two different charge/discharge modes. Moreover, from the economic and electrochemical performance view point, we also demonstrated that 1% of graphene content is optimized no matter the capacity calculated, based on the LFP/graphene composite or pure LFP.


2019 ◽  
Vol 7 (31) ◽  
pp. 18434-18441 ◽  
Author(s):  
Juan Luis Gómez-Cámer ◽  
Begoña Acebedo ◽  
Nagore Ortiz-Vitoriano ◽  
Iciar Monterrubio ◽  
Montserrat Galcerán ◽  
...  

Carbon coated tin phosphide is synthesized by an easily scalable ball milling method. The origin of the different electrochemical performance of tin phosphide electrodes in ether- and carbonate-based electrolytes is discussed.


2017 ◽  
Vol 5 (22) ◽  
pp. 11214-11223 ◽  
Author(s):  
Yuanzhe Song ◽  
Xuebing Zhao ◽  
Chao Wang ◽  
Han Bi ◽  
Jie Zhang ◽  
...  

Local heterogeneity in crystal lattice is directly observed in synthesized Li2MnO3/LiMO2 (M = Ni, Mn) cathode materials. With SAED application, for the first time, we accordingly uncover that the lattice heterogeneity is induced by different Li2MnO3 atomic arrangements coexisting in same crystal domain.


ChemSusChem ◽  
2016 ◽  
Vol 9 (20) ◽  
pp. 2982-2993 ◽  
Author(s):  
S. Fleischmann ◽  
M. Mancini ◽  
P. Axmann ◽  
U. Golla-Schindler ◽  
U. Kaiser ◽  
...  

2021 ◽  
Vol 63 (5) ◽  
pp. 55-59
Author(s):  
Thi Hong Anh Le ◽  
◽  
Hong Quan Duong ◽  
Huy Chich Bui ◽  
Ngoc Cuong Hoang ◽  
...  

The paper focused on the drying condition of the infrared radiation combining the heat pump for the snakehead fish basing on the level 1 multi-factor experimental planning model of Box-Wilson. The results showed the mathematical model (Y = 8.92 + 0.44X1 - 0.53X2 - 0.48X3 - 0.098X1X2 - 0.39X1X3 + 0.126X2X3) that expressed the relationship between the drying time (Y) and the impact factors (the sorbitol concentration (X1), the drying temperature (X2), and the wind speed (X3), in which the drying temperature (X2) affected the drying time stronger than other factors. The optimisation condition of drying was the sorbitol concentration of 2.5%, the drying temperature at 57.5oC, the wind speed of 1.6 m/s, and the drying time of 8.27 hours. Dried snakehead fish at the optimum condition got the sensory quality, food hygiene, and safety higher than the air drying and sun drying methods. The results are a scientific basis for completing the technology and widely deploying the drying method in production.


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