The search for the best designs containing lithium batteries not cease for a moment. Scientists from the U.S. rice University (Rice University) made a discovery that promises three times to prolong the life of the promising lithium metal batteries.
Lithium metal battery implies is the anode made of graphite to use an electrode made of pure lithium. Potentially, this promises to lead to much faster charging batteries with a capacity ten times greater than modern always select lithium-ion batteries. Obstacle on this path are the negative side effects of using pure lithium in the electrodes.
For example, during charge and discharge of lithium metal batteries on the electrodes begins to actively grow deposits in the form of needles? dendrites. These formations are able to pierce the membrane between the electrodes and cause short circuits followed by fire and even explosion of the battery. Research scientists from rice University aimed at suppressing the growth of dendrites on lithium anode.
Scientists have developed a simple and inexpensive for mass production the technology of applying protective coating on the lithium electrodes. On the part of the lithium electrode with copper current collector is applied to the adhesive tape, after which there is heating of the electrode from the side of the tape a laser to the surface temperature of 2026 °C. In the heating process on the copper surface forms a porous coating of silicon oxide with inclusions of graphene. Experiments with electrodes with the coating showed that in the process of the battery, the growth of dendrites is suppressed without deteriorating the properties of the batteries.
Note, we are talking about the lithium metal batteries with no excess lithium in the composition of the anodes. Traditionally, to increase the capacity of lithium metal batteries was proposed to create a reserve of lithium in the composition of the anodes, which in turn led to an increase in the weight and cost of such batteries. The discovery of scientists from rice University allows you to create batteries with no excess lithium in the anode, making lithium metal batteries easier and emce at the same time. Scientists estimate that the proposed technology three times will increase the operating time of lithium metal batteries with no excess lithium.