On the structure and electrochemical reactions with lithium of tin(II) phosphate chloride
A crystalline solid of Sn{sub 2}PO{sub 4}Cl stoichiometry and orthorhombic structure was characterized and used as electrode material vs. a lithium metal anode. The structure of the solid resembles that of SnO; tin atoms protrude from layers of PO{sub 4} tetrahedra, while chlorine atoms are located between Sn layers. Two-electrode electrochemical cells of the type Li/LiClO{sub 4}(PC:EC)/Sn{sub 2}PO{sub 4}Cl (PC, propylene carbonate; EC, ethylene carbonate) were mounted and discharged to a maximum capacity close to 6.4 faradays per Sn atom. This corresponds to the complete reduction of Sn(II) to Sn(0) followed by the formation of noncrystalline Li-Sn alloys up to a limiting composition of Li{sub 22}Sn{sub 5}. The second step of the discharge shows an interesting reversibility. After a decrease in capacity during the first ten cycles, ascribable to the increase in the size of tin domains, the charge and discharge capacities remain close to 300 Ah/kg (Sn) up to ca. 40 cycles.
- Research Organization:
- Univ. de Cordoba (ES)
- OSTI ID:
- 20080560
- Journal Information:
- Journal of the Electrochemical Society, Vol. 147, Issue 5; Other Information: PBD: May 2000; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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