Patent ID: 9431681
Filing Date: 2016-08-30
CPC Classification: H01M,Y02E,Y02P

Claim Text:
1. A molten sodium secondary cell that charges at a high temperature and discharges at a relatively lower temperature, comprising: a sodium anode that undergoes electrochemical oxidation during discharge and electrochemical reduction during charge; a cathode that undergoes electrochemical reduction during discharge and electrochemical oxidation during charge, wherein the cathode comprises a catholyte composition that is thermally stable at cell operating conditions; a sodium ion conductive solid membrane separating the cathode and catholyte composition from the sodium anode that selectively transports sodium ions and is chemically and thermally stable at cell operating conditions; and a solar energy source comprising: wherein the cell has a charge temperature and a charge voltage and a discharge temperature and a discharge voltage, wherein the charge temperature is substantially higher than the discharge temperature and the charge voltage is lower than the discharge voltage.