Engineering topics
Ratnakumar, B.
Publications and source records attributed to Ratnakumar, B..
Performance Characteristics of Lithium-Ion Cells for Mars Sample Return Athena Rover
In contrast to the primary batteries (lithium thionyl chloride) on the Sojourner Mars Rover and the upcoming 2001 Mars Rover, the Mars Sample Return (MSR) Athena Rover will utilize rechargeable lithium ion batteries, following the footsteps of MSP 2001 Lander.
Performance Characteristics of Lithium-Ion Cells for NASA's Mars 2001 Lander Application
NASA requires lightweight rechargable batteries for future missions to Mars and the outer planets that are capable of operating over a wide range of temperatures, with high specific energy and energy densities.
Irreversible Capacities of Graphite in Low Temperature Electrolytes for Lithium-Ion Batteries
Carbonaceous anode materials in lithium ion rechargeable cells experience irreversible capacity, mainly due to a consumption of lithium in the formation of surface passive films. The stability and kinetics of lithium intercalation into the carbon anodes are dictated by these films.
Electrolytes for Li-Ion Cells in Low Temperature Applications
A number of upcoming NASA missions require energy storage devices which display high energy density and can effectively operate at low temperature. Lithium-ion batteries have been identified as the most promising technology which can meet these stringent requirements.
Lithium Ion Batteries for Mars Exploration Missions
The upcoming NASA's missions aimed at exploring our Planetary system require batteries that can operate at extreme operating temperatures, with high specific energy and energy densities. Conventional aerospace rechargeable battery systems are inadequate to meet the demands.
A(sup 119)Sn Mossbauer Spectometry Study of Li-SnO Anode Materials for Li-Ion Cells
Anode materials of SnO were charged reversibly with Li to capacities greater than 600 mAh/g.
Lithium Ion Batteries for Mars Exploration Missions
The desired performance characteristics and physical requirements of spacecraft batteries for planetary exploration are reviewed, particularly with respect to surface landers and rovers intended for near-future Mars missions.
The Role of Electrolyte Upon the SEI Formation Characteristics and Low Temperature Performance of Lithium-Ion Cells With Graphite Anodes
Quarternary lithium-ion battery electrolyte solutions containing ester co-solvents in mixtures of carbonates have been demonstrated to have high conductivity at low temperatures (<-20 degrees Celcius).
Hydrogen Desorption and Adsorption Measurements on Graphite Nanofibers
Graphite nanofibers were synthesized and their hydrogen desorption and adsorption properties are reported for 77 and 300 K.
Electrolytes for Low Temperature Lithium Batteries Based on Ternary Mixtures of Aliphatic Carbonates
The success of rechargeable lithium ion batteries may be largely attributed to the surface films on the carbon anodes, which provide the anodes with adequate protection against continued reaction with electrolyte while permitting charge transfer.
Development of High Conductivity Lithium-ion Electrolytes for Low Temperature Cell Applications
NASA has continued interest in developing power sources which are capable of operating at low temperatures (-20 degrees C and below) to enable future missions, such as the Mars Rover and Lander.
Electrolytes for Low Temperature Lithium-Ion Cells
Lithium-ion rechargeable batteries have been demonstrated to have high energy density, high voltage, and excellent cycle life which make this technology more attractive than competing systems such as Ni-Cd and Ni-H2.