High rate metal oxyhalide cells
First Claim
1. In a non-aqueous electrochemical cell system having an active metal anode, a cathode and a non-aqueous electrolyte in an oxyhalide depolarizer, the improvement comprising:
- a catalyst for the reduction of said oxyhalide depolarizer comprising metal porphyrin complexes selected from the group consisting of monomeric and polymeric tetraphenyl porphyrin (TPP) and tetramethoxyphenyl porphyrin (TMPP) and wherein said metal of said complex is selected from the group consisting of iron and cobalt.
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Abstract
A class of improved catalysts for use in high-rate active-metal non-aqueous cells which show excellent performance enhancing properties are disclosed. These comprise a class of metal porphyrin complexes which catalyze the electrochemical reduction of oxyhalides. The preferred porphyrin compounds include tetraphenyl porphyrin (TPP) and tetramethoxyphenyl porphyrin (TMPP). The preferred complexed metals are cobalt and iron yielding (CoTPP), (FeTPP), CoTMPP) and (FeTMPP), respectively. A polymeric form of TPP complexed with cobalt (CoTPP)n or iron (FeTPP)n is extremely insoluble in the typical Li/SOCl2 cell electrolyte and may be used very successfully in active cell configurations is also disclosed.
14 Citations
15 Claims
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1. In a non-aqueous electrochemical cell system having an active metal anode, a cathode and a non-aqueous electrolyte in an oxyhalide depolarizer, the improvement comprising:
a catalyst for the reduction of said oxyhalide depolarizer comprising metal porphyrin complexes selected from the group consisting of monomeric and polymeric tetraphenyl porphyrin (TPP) and tetramethoxyphenyl porphyrin (TMPP) and wherein said metal of said complex is selected from the group consisting of iron and cobalt. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. In a non-aqueous electrochemical cell having a lithium anode, a carbon cathode and a non-aqueous electrolyte comprising LiAlCl4 salt in SOCl2 depolarizer solvent the improvement comprising:
a catalyst for the reduction of said oxyhalide depolarizer comprising metal porphyrin complexes selected from the group consisting of monomeric and polymeric tetraphenyl porphyrin (TPP) and tetramethoxyphenyl porphyrin (TMPP) and wherein said metal of said complex is selected from the group consisting of iron and cobalt. - View Dependent Claims (14, 15)
Specification