High-Level Project Summary
Development of high-temperature primary batteries for Venus surface tasks. At the surface, the temperature is 465°C accompanied by the high pressure CO2 pressure of CO2 of 90 atmospheres Lithium battery development. We're looking at this technology based on what was in the past using molten salts. This is the chemistry of the high-temperature battery. The lithium alloy should be as the positive electrode, and then the cathodes can be a group of materials usually trisulphide, actually charge it after each 8 hours and then we managed to get another 30 to 40 days of operation here. So overal the cell actually survived for 120 days at 475 degrees C and then, in a rechargeable mode.
Link to Final Project
Link to Project "Demo"
Detailed Project Description
The secrets of Venous
A lithium-ion battery was used in a ceramic body
The anode is Li-AL
We use separators of magnesium oxide
The cathode is a tri-sulfide material, the best of which is metallic phosphorous trisulfide, as it provides a higher capacity compared to mono- and disulfide by 50%, as well as has higher energy and better thermal stability, starting at 400 ° C..
It was noticed that the shorter the discharge time, the greater the amount of the cathode is dissolved in the electrolyte, Hence, it is not available for interaction. To overcome this, we electroplating the cathode with aluminum phosphate or aluminum borate coating, and the thickness of the coating layer is within 10 nanometers, which increases the capacity by approximately 50%
Electrolyte Na -Li
It is a different mixture of molten salts, usually chlorides of strong metals, lithium chloride and potassium chloride, and sometimes bromides and fluorides are added depending on the composition, and the separators are magnesium oxide.
Since the longer the discharge time, the greater the amount of the cathode is dissolved in the electrolyte, we made another slight modification, where we used two beads of electrolyte, one towards the cathode and the other towards the anode, where we got better performance, perhaps due to the presence of more electrolyte and thus we got a larger capacity and operation of the cell On average, about 25 days
Another method that the researchers came up with is the use of a solid electrolyte, which is insoluble at the cathode in molten salts, so they used LLZO, a solid electrolyte based on garnet and actually reduced the solubility of the cathode
Through research, it was found that instead of waiting for the cell to be completely discharged, we charge it every 8 hours
As the capacity is slightly increased in the second discharge compared to the first discharge, and indeed we were able to obtain another 30 to 40 days, and in general, the cell actually survived at 120 days at a temperature of 475 degrees Celsius.
Space Agency Data
I used some open data from NASA
Hackathon Journey
I got a lot of useful information about Venus and others, such as the development of the battery industry and how to correct scientific research
References
1- https://cfn-live-content-bucket-iop-org.s3.amazonaws.com/journals/2151-2043/MA2020-02/2/227/revision2/MA2020-022227mtgabssva-transcript.txt?AWSAccessKeyId=AKIAYDKQL6LTV7YY2HIK&Expires=1665184795&Signature=zou8kRVp284ynlZGeyfwNWWuujI%3D
2- High Temperature Batteries for Venus Surface Missions
Dean Glass1, John-Paul Jones2, Abhijit V. Shevade1, Eric Raub3, Dharmesh Bhakta3 and Ratnakumar Bugga1
© 2020 ECS - The Electrochemical Society
3 -Journal of Power Sources
Volume 449، 15 2020 ، 227492
4- https://www.sciencedirect.com/science/article/abs/pii/S1385894717318375
Tags
#venus #Lithium battery# LLZO#