Effect of Content of Mg on the Electrochemical Performance of La1-xMgxNi2.8Co0.7 (x=0.1, 0.3, 0.5) Hydrogen Storage Alloy

2010 ◽  
Vol 113-116 ◽  
pp. 2129-2133
Author(s):  
Jing Wang ◽  
Dao Bin Mu ◽  
Feng Wu ◽  
Shi Chen
Keyword(s):  
Hydrogen Storage ◽  
Electrochemical Performance ◽  
Discharge Capacity ◽  
Hydrogen Storage Alloy ◽  
Diffusion Method ◽  
Capacity Retention ◽  
Solid Diffusion ◽  
Maximum Discharge

La1-xMgxNi2.8Co0.7 (x=0.1, 0.3, 0.5) hydrogen storage alloy was synthesized by solid diffusion method. The microstructure of the alloy was analyzed by XRD when the content of Mg was changed. When x equaled to 0.3, there was relative much La2Ni7 phase in the alloy and the alloy exhibited better integrated electrochemical performance. Its maximum discharge capacity reached 355.4mAh/g and capacity retention after 50 cycles（S50）was 77.80%. The results showed the existence of La2Ni7 phase would be conductive to the integrated electrochemical performance of the alloy.

Microstructure and Self-Discharge Characteristic of Ti-Zr-V-Cr-Ni-Ce Hydrogen Storage Electrode Alloy

2012 ◽  
Vol 512-515 ◽  
pp. 1409-1412
Author(s):  
Yu Qing Qiao ◽  
Min Shou Zhao ◽  
Li Min Wang
Keyword(s):  
Hydrogen Storage ◽  
Discharge Capacity ◽  
The Other ◽  
Hydrogen Storage Alloy ◽  
Alloy Electrode ◽  
Irreversible Capacity ◽  
Discharge Characteristics ◽  
Discharge Characteristic ◽  
Capacity Loss ◽  
Eis Measurements

Microstructure and self-discharge characteristics of Ti-Zr-V-Cr-Ni-Ce hydrogen storage electrode have been investigated by XRD, FESEM-EDS and EIS measurements. Self-discharge properties indicate that the irreversible capacity loss is negative, which is different from that of AB5 alloy electrode. The capacity loss can be divided in two parts, one is due to the deterioration of the hydrogen storage alloy, which will result in the decrease of discharge capacity, and the other is due to the continually activated, which will result in the increase of discharge capacity.

scholarly journals Investigation on the Structure and Electrochemical Properties of La-Ce-Mg-Al-Ni Hydrogen Storage Alloy

2013 ◽  
Vol 2013 ◽  
pp. 1-6
Author(s):  
Yuqing Qiao ◽  
Jianyi Xi ◽  
Minshou Zhao ◽  
Guangjie Shao ◽  
Yongchun Luo ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Discharge Capacity ◽  
Current Density ◽  
Electrochemical Impedance ◽  
Type Structure ◽  
Hydrogen Storage Alloy ◽  
Alloy Electrode ◽  
Electrochemical Characteristics ◽  
Transfer Resistance ◽  
Discharge Current Density

Structure and electrochemical characteristics of La0.96Ce0.04Mg0.15Al0.05Ni2.8hydrogen storage alloy have been investigated. X-ray diffraction analyses reveal that the La0.96Ce0.04Mg0.15Al0.05Ni2.8hydrogen storage alloy consisted of a (La, Mg)Ni3phase with the rhombohedral PuNi3-type structure and a LaNi5phase with the hexagonal CaCu5-type structure. TEM shows that the alloy is multicrystal with a lattice space 0.187 nm. EDS analyse shows that the content of Mg is 3.48% (atom) which coincide well with the designed composition of the electrode alloy. Electrochemical investigations show that the maximum discharge capacity of the alloy electrode is 325 mAh g−1. The alloy electrode has higher discharge capacity within the discharge current density span from 60 mA g−1to 300 mA g−1. Electrochemical impedance spectroscopy measurements indicate that the charge transfer resistanceRTon the alloy electrode surface and the calculated exchange current densityI0are 0.135 Ω and 1298 mA g−1, respectively; the better eletrochemical reaction kinetic of the alloy electrode may be responsible for the better high-rate dischargeability.

Effects of Li2MnO3 coating on the high-voltage electrochemical performance and stability of Ni-rich layer cathode materials for lithium-ion batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (27) ◽  
pp. 22625-22632 ◽  
Author(s):  
Honglong Zhang ◽  
Bing Li ◽  
Jing Wang ◽  
Bihe Wu ◽  
Tao Fu ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Discharge Capacity ◽  
High Voltage ◽  
Cathode Materials ◽  
Coating Layer ◽  
Lithium Ion ◽  
Capacity Retention ◽  
Active Materials

The Li2MnO3-coated LiNi0.8Co0.1Mn0.1O2 shows a higher discharge capacity and a better capacity retention. The coating layer can protect the NCM active materials from CO2, suppressing the formation of Li2CO3 on the surface of NCM materials.

Effect of rapid solidification treatment on structure and electrochemical performance of low-Co AB5-type hydrogen storage alloy

2014 ◽  
Vol 32 (6) ◽  
pp. 526-531 ◽  
Author(s):  
Qingrong YAO ◽  
Ying TANG ◽  
Huaiying ZHOU ◽  
Jianqiu DENG ◽  
Zhongmin WANG ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Electrochemical Performance ◽  
Rapid Solidification ◽  
Hydrogen Storage Alloy

scholarly journals A high rate and stable electrode consisting of a Na3V2O2X(PO4)2F3−2X–rGO composite with a cellulose binder for sodium-ion batteries

RSC Advances ◽  
2017 ◽  
Vol 7 (35) ◽  
pp. 21820-21826 ◽  
Author(s):  
P. Ramesh Kumar ◽  
Young Hwa Jung ◽  
Syed Abdul Ahad ◽  
Do Kyung Kim
Keyword(s):  
Electrochemical Performance ◽  
Discharge Capacity ◽  
Sodium Ion ◽  
High Rate ◽  
Sodium Ion Batteries ◽  
Capacity Retention ◽  
Full Cell ◽  
Enhanced Electrochemical Performance

Na3V2O2X(PO4)2F3−2X–rGO with CMC binder shows the enhanced electrochemical performance; it exhibits 98% capacity retention at 0.1C rate over 250 cycles. Also, it remits discharge capacity of 98 mA h g−1 at 0.2C in a full cell with a NaTi2(PO4)3–MWCNT.

Effect of Solid Reaction Temperature on the Cation Mixing and Electrochemical Properties of LiNi0.4Co0.2Mn0.4O2 Catode Materials in High Energy Li-Ion Batteries

2014 ◽  
Vol 1058 ◽  
pp. 312-316
Author(s):  
Lin Zhang ◽  
Fei Luo ◽  
Xing Shuai Zhang ◽  
Yu Zhong Guo
Keyword(s):  
Electrochemical Performance ◽  
Discharge Capacity ◽  
Reaction Temperature ◽  
Retention Rate ◽  
High Energy ◽  
Solid Reaction ◽  
Capacity Retention ◽  
Li Ion ◽  
Cation Mixing ◽  
Co Precipitation

A LiNi0.4Co0.2Mn0.4O2 material was prepared via the co-precipitation in solution and ensuing solid reaction of the prepared precursors with LiOH.H2O, investigating the influence of solid reaction temperature on the cation mixing and electrochemical performance of the materials as a cathode. The results show that Li+/Ni2+ cation mixing decreases with the increase of calcination temperature in the range of 700-900°C, and the lower degree of cation mixing can improve 2D layered structure and make the material more stable. The discharge capacity and the capacity retention rate of the material is strongly impacted by the reaction temperature.The powders calcined at 900°C show the best electrochemical performance and the initial discharge capacity is 163.1mA·h/g, after 40 cycles, the capacity retention rate is 93.9%.

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