CoS2Coatings for Improving Thermal Stability and Electrochemical Performance of FeS2Cathodes for Thermal Batteries

2018 ◽  
Vol 165 (9) ◽  
pp. A1725-A1733 ◽  
Author(s):  
Huilong Ning ◽  
Zhijian Liu ◽  
Youlong Xie ◽  
Haifeng Huang
Keyword(s):  
Thermal Stability ◽  
Electrochemical Performance ◽  
Thermal Batteries

Novel Proton Exchange Membrane for High Temperature Fuel Cells

1997 ◽  
Vol 496 ◽  
Author(s):  
M. Bhamidipati ◽  
E. Lazaro ◽  
F. Lyons ◽  
R. S. Morris
Keyword(s):  
Thermal Stability ◽  
Fuel Cells ◽  
High Temperature ◽  
Electrochemical Performance ◽  
Proton Exchange Membrane ◽  
Research Effort ◽  
Analysis Data ◽  
Proton Exchange ◽  
Temperature Conductivity ◽  
Exchange Membrane

ABSTRACTThis research effort sought to demonstrate that combining select phosphonic acid additives with Nafion could improve Nafion's high temperature electrochemical performance. A 1:1 mixture of the additive with Nafion, resulted in a film that demonstrated 30% higher conductivity than a phosphoric acid equilibrated Nafion control at 175°C. This improvement to the high temperature conductivity of the proton exchange membrane Nafion is without precedent. In addition, thermal analysis data of the test films suggested that the additives did not compromise the thermal stability of Nafion. The results suggest that the improved Nafion proton exchange membranes could offer superior electrochemical performance, but would retain the same degree of thermal stability as Nafion. This research could eventually lead to portable fuel cells that could oxidize unrefined hydrocarbon fuels, resulting in wider proliferation of fuel cells for portable power.

scholarly journals Structure and electrochemical performance modulation of a LiNi0.8Co0.1Mn0.1O2 cathode material by anion and cation co-doping for lithium ion batteries

RSC Advances ◽  
2019 ◽  
Vol 9 (63) ◽  
pp. 36849-36857 ◽  
Author(s):  
Rong Li ◽  
Yong Ming ◽  
Wei Xiang ◽  
Chunliu Xu ◽  
Guilin Feng ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Energy Density ◽  
Electrochemical Performance ◽  
Transition Metal Oxides ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Practical Application ◽  
Co Doping ◽  
Layered Transition Metal ◽  
Great Energy

Ni-rich layered transition metal oxides show great energy density but suffer poor thermal stability and inferior cycling performance, which limit their practical application.

Improvement of Electrochemical Performance and Thermal Stability by Reducing Residual Lithium Hydroxide on LiNi0.8Co0.1Mn0.1O2 Active Material using Amorphous Carbon Coating

2018 ◽  
Vol 21 (2) ◽  
pp. 071-075 ◽  
Author(s):  
Ji-Woong Shin ◽  
Jong-Tae Son
Keyword(s):  
Thermal Stability ◽  
Electrochemical Performance ◽  
Cathode Material ◽  
Amorphous Carbon ◽  
Carbon Coating ◽  
Solid Electrolyte Interphase ◽  
Active Material ◽  
Rate Capability ◽  
Lithium Carbonate ◽  
Lithium Hydroxide

Using LiNi0.8Co0.1Mn0.1O2 as a starting material, a surface-modified cathode material was obtained by coating it with a nanolayer of amorphous carbon, where the added C12H22O11 (sugar) was transformed to Li2CO3 compounds after reacting with residual LiOH on the surface. A thin and uniformly smooth nanolayer (35 nm thick) was observed on the surface of the LiNi0.8Co0.1Mn0.1O2, as confirmed by transmission electron microscopy (TEM). The amount of residual lithium hydroxide (LiOH) was significantly reduced through the formation of lithium carbonate (Li2CO3). As a result, carbon-coated LiNi0.8Co0.1Mn0.1O2 exhibited noticeable improvement in capacity and rate capability and much lower exothermic heat in the charged state at 4.3V. The improved electrochemical performance and thermal stability are attributed to the carbon coating, which reduced the residual lithium hydroxide, protected the cathode material from reacting with the electrolyte, and slowing the incrassation of the solid electrolyte interphase (SEI) film on the surfaces of the oxide particles.C12H22O11 + 12O2 → 12CO2 + 11H2OPACS number: 73.20.At

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