Lithium Batteries 3.2V 50AH LFP Cells High Quality Li-Ion Battery For EV/Energy Storages
|Cut-off Charging Voltage||Max. 3.65V|
|Standard Charging Method||Constant Current/ Constant Voltage|
|Cut-off Discharging Voltage||2.5V|
|Max. Continuous Current||2C|
|Max. Cotinuous Current||2C|
|Cycle Life||>5000 cycle times|
|Ambient Temperature||for Standard Charge||0℃~45℃|
|State of Charge(SOC)||30%~50%|
|Weight of Bare Cell||about 1.1 kg|
|Charge State Internal Impedance||0.9mΩ|
The researchers first decided the anode needed to be sulfur, a widely available byproduct of natural gas and petroleum refining that’s very energy dense, having the lowest cost per stored charge next to water and air. The challenge then was finding an inexpensive liquid cathode material that remained stable while producing a meaningful charge. That seemed improbable — until a serendipitous discovery in the lab.
On a short list of candidates was a compound called potassium permanganate. If used as a cathode material, that compound is “reduced” — a reaction that draws ions from the anode to the cathode, discharging electricity. However, the reduction of the permanganate is normally impossible to reverse, meaning the battery wouldn’t be rechargeable.
Still, Li tried. As expected, the reversal failed. However, the battery was, in fact, recharging, due to an unexpected oxygen reaction in the cathode, which was running entirely on air. “I said, ‘Wait, you figured out a rechargeable chemistry using sulfur that does not require a cathode compound?’ That was the ah-ha moment,” Chiang says.