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Potassium Absolute K(2)O Ga(2)O(3) Absolute S Battery

IP.com Disclosure Number: IPCOM000084933D
Original Publication Date: 1976-Jan-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Chicotka, RJ: AUTHOR [+2]

Abstract

A secondary battery concept that is receiving attention is the Na-S cell, where the Na anode and S cathode are isolated by a separator of beta alumina (Na(2)O xAl(+2)O(3)). This separator is permeable to sodium ions only. During discharge of the battery, Na migrates through the beta-Al(2)O(3) to combine with S/--/ ions in the cathode compartment and form a mixture of Na(2)S(x), while x is 1, 2, 4, and 5 (sodium polysulfides). These cells must be operated at approximately 300 degrees C or above in order to maintain this complex cathode mixture molten. If it is permitted to freeze, the cell ceases to function.

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Potassium Absolute K(2)O Ga(2)O(3) Absolute S Battery

A secondary battery concept that is receiving attention is the Na-S cell, where the Na anode and S cathode are isolated by a separator of beta alumina (Na(2)O xAl(+2)O(3)). This separator is permeable to sodium ions only. During discharge of the battery, Na migrates through the beta-Al(2)O(3) to combine with S/--/ ions in the cathode compartment and form a mixture of Na(2)S(x), while x is 1, 2, 4, and 5 (sodium polysulfides). These cells must be operated at approximately 300 degrees C or above in order to maintain this complex cathode mixture molten. If it is permitted to freeze, the cell ceases to function.

Since Na/+/ is the sole transporter of charge, the most sodium-rich phase (Na(2)S) tends to accumulate nearest the separator. Since it is also the highest melting of the various sulfides (approximately 1000 degrees C), the battery can continue to operate only as long as this high-melting product is dissolved into the remaining, lower melting mixture.

Potassium polysulfides all melt lower than the corresponding sodium compounds. A K Absolute K(2)O xAl(2)O(3) Absol. S cell should in principle avoid the high-operating temperatures of the sodium cell by the formation of the potassium polysulfides. However, the conductivity of K/+/ in potassium beta- alumina is so low that this cell is not practical.

The K/+/ conductivity in K(2)O xGa(2)O(3) is expected to be higher than that in the aluminum counterpart, becaus...