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Scientists claim breakthrough improvement battery capacity
Scientists at Stanford University claim to have the ‘holy grail’ of battery technology developed: they claim a stable anode of lithium have been developed, using a protective carbon nano layer instead of graphite or silicon.
Most of the batteries and batteries for electrical equipment already contains lithium, the lithium-ion batteries. However, this is only the electrolyte is based on lithium; The cathode is built around metal and the anode is graphite or silicon. An anode of lithium would have great advantages in terms of battery capacity, but until now was science against such big problems in developing a lithium anode that seemed out of reach.
One of the problems is that lithium greatly expands during charging, causing cracks and holes occur in envelopes. Thereby escape lithium-ion thereon form called dendrites; that could cause a short circuit and severely shorten the life of batteries. A second problem is that the lithium reacts chemically in the electrolyte, and this medium between the anode and cathode thereby consumed. Finally, there are risks of heat generation, as is already the case with lithium-ion batteries.
Scientists from Stanford University now claim the head having afforded by screens with a protective layer that they have been baptized. Nano sphere off the lithium anode these problems The layer consists of domes of carbon connected to each other in a honeycomb-structure, with a thickness of 20 nanometers. The layer is chemically stable and strong enough to withstand the chemical reactions to be resistant and yet flexible enough to keep. The expanding lithium in check
The nanospheres layer provides a strong improvement in the ratio between the amount of lithium that can be used when using the battery and the amount added during loading. Extracted from the anode This ratio should, wherever possible cycles of charge / discharge ideally 99.9 per cent for commercial use, but for lithium anodes was until now only 96 percent. The battery of the science team is currently achieved an efficiency of 99 percent at 150 cycles, but this can be improved according to the scientists to the desired 99.9 percent.
“With some adjustments and new electrolytes we believe we can create the next generation of rechargeable batteries and battery powering a practical and stable lithium anode,” says Steven Chu of the research team. He hint that the finding of a fourfold of battery capacity and doubling the battery life of smartphones and electric cars can provide. The team publishes its research in a scientific journal Nature Nanotechnology.
Scientists working on significant improvements in battery technology, but many ideas will not make it to practical applications or make improvements only in the long term. The battery technology runs into limits on making improvements to battery life for example lag behind improvements in performance.
Li deposition on a Cu substrate with and without carbon nano sphere modification.Viewing:-166
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