Effect of temperature and electrolyte composition on the lithium-boron alloy anode in nitrate melts: Passivating films on solid and liquid lithium
✍ Scribed by M.H. Miles; G.E. McManis; A.N. Fletcher
- Publisher
- Elsevier Science
- Year
- 1985
- Tongue
- English
- Weight
- 795 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
The discharge characteristics of the Li(B) anode in molten LiNOs-KNO, improve markedly at temperatures above the melting point of lithium. These results show the importance of the liquid anode concept for high rate batteries. The Li(B) anode is quite stable in the LiN03-KNO, melt at temperatures up to 300°C and yields current efficiencies exceeding 90%. This stability is lost in initially Lie-free melts such as NaNOa-KNOs where rapid deterioration of the anode is observed. These experimental results are explained by a thin passivating Liz0 film on the anode that is destabilized in melts having low lithium ion concentrations where oxides are converted to peroxides and superoxides. Experimental thermodynamic values for the Li(B)/LiNO,-KNO,/AgNO,(0.17 m) cell at 250°C are E = 3.361 V, AG = -324.3 kJ, AS = -61.2 J K-' and AH = -356.3 kJ. Thermodynamically, the Li(B) anode functions essentially as a lithium electrode