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Bronzes show promise for use as cathodes in lithium batteries
November 09, 2005Phosphate tungsten bronzes have been tested as cathodes in electrochemical lithium insertion cells
Since their discovery in 1830 the tungsten bronzes have been extensively studied due to their interesting chemical, electrical and optical properties. An interesting structural feature at the molecular level is the presence of long, empty tunnels. These tunnels can have other ions inserted into them to enhance and alter the properties of the base material.
This study, published in AZojomo*, by A. Martínez-de la Cruz, F. H. Guillén Garza, U. Ortiz Méndez and Leticia M. Torres-Martínez from Universidad Autónoma de Nuevo León, looked at the electrochemical insertion of lithium into the tunnels of some diphosphate tungsten bronzes. This was done in order to assess their potential as cathodes for use in lithium batteries.
An electrochemical study of the lithium insertion through potentiostatic and galvanostatic experiments was carried out. Due to the high oxidation state of the tungsten in the oxides the amount of lithium inserted in alkali phosphate tungsten bronzes was large, but due to irreversible processes, specific capacity of the cells were dramatically lost after the first cycle. Taking this behaviour into account it is suggested that these bronzes can be considered as a cathode in primary lithium batteries.
AZoNetwork
An electrochemical study of the lithium insertion through potentiostatic and galvanostatic experiments was carried out. Due to the high oxidation state of the tungsten in the oxides the amount of lithium inserted in alkali phosphate tungsten bronzes was large, but due to irreversible processes, specific capacity of the cells were dramatically lost after the first cycle. Taking this behaviour into account it is suggested that these bronzes can be considered as a cathode in primary lithium batteries.
AZoNetwork
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Hydrogen tank lighter than battery
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Sweet nanotech batteries
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New 'layered-layered' materials for rechargeable lithium batteries
Researchers at the Department of Energy's Argonne National Laboratory have developed a new approach to increasing the capacity and stability of rechargeable lithium-ion batteries.
MIT powers up new battery for hybrid cars
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New battery technology helps stimulate nerves
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Free smoke alarm programmes are failing
Providing and installing free smoke alarms to poor, urban households does not reduce fire related injuries and may be a waste of resources, find two studies in this week's BMJ. In the first study, smoke alarms were given out to 19,950 households in a deprived, multiethnic, urban community in inner London. Free installation was offered and postcards reminding that the battery should be changed were sent out one year later. Control households received no intervention. Giving out free smoke alarms did not reduce injuries related to fire, admissions to hospital and deaths, or fires attended by the fire brigade. Widespread implementation of such programmes may be a waste of resources and of littl
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