Parameter analysis of a practical lithium- and sodium-air electric vehicle battery

摘要

For electric vehicles (EV) having a 500km range between charges, there is a need to develop smaller and lower-cost batteries. Lithium-air has the potential to deliver a step change in the specific energy of rechargeable lithium batteries. In order to develop a practical, safe, smaller and lower-cost lithium and sodium-air rechargeable EV battery it is necessary to eliminate the formation of dendritic deposits (on charge), increase the current density up to 100mAcm~(-2) (or reducing cell DC resistance to less than 10賑m~2) and change the oxygen-discharge product from peroxide to oxide. We suggest here a novel concept, namely to replace the metallic lithium anode by liquid sodium and to operate the sodium-oxygen cell above the sodium melting point (97.8℃). In this report we studied the deposition-dissolution process of sodium in polymer electrolytes at 105℃ and we present, for the first time, preliminary results that demonstrate the feasibility of running a liquid-sodium-oxygen cell with polymer electrolytes at above 100℃.