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|Stanford University and the Stanford Linear Accelerator Center National Accelerator Laboratory (SLAC National Accelerator Laboratory) has developed a battery electrode capable of self-repair. Unfortunately, the use of silicon electrodes of lithium-ion battery life is not very long - this is because the expansion will occur at the electrodes during charging and discharging and then shrink again. Over time, these silicon electrodes will produce cracks in the end because cracks can no longer store excess electrons.
This process leads to the research team began to consider how to deal with the nature of this situation. In an organism, cells suffer damage, but can also be self-healing.
The team on a paper wrote:. "This spontaneous ability to repair damage - also known as self-healing, is the nature of the viability of an important, because it can extend the life of the most bio-rechargeable batteries , this capability is particularly useful because the life of a high-capacity electrodes (such as silicon electrode) because of mechanical crack appears and the cycle is shortened. "
In order to achieve the same type of "healing" effects in silicon electrode, the research team developed a polymer coating for the electrode - research to develop robots with artificial "skin" is made of the same type. This polymer is chemically weaker than normal polymers can be disconnected when the silicon electrode expansion; but after breaking the chemical bonds are still attracted to each other. Thus, with the contraction of the silicon electrode, the polymer restitution and pack electrode to its original look.
You can use the following picture was observed under an electron microscope this process performance. On the left, the silicon electrode cracks appeared; but after a few hours, where several cracks had healed. The team's work is not yet complete. By using this self-healing polymers, the research team on the respective silicon electrodes 100 charge-discharge cycles, it found that the respective electrodes can still be used, and there is no loss of storage capacity. The future of this technology is very promising, but still close to their overall goal.
"This is still far from achieving our goal: for mobile phones is about 500 charge-discharge cycles, as well as for electric vehicles 3,000 charge-discharge cycles." Fellow Cui Yi (Yi Cui, sound) in a press release said, "but I hope also, from all of our data, it appears that this approach is feasible. "
With the continuous development of economic globalization, the pursuit of rapid economic development a top priority in many countries. However, in recent years, some countries sided pursuit of economic growth at the expense of the Earth's natural environment protection and management of natural environment worldwide destruction, ecological imbalances intensified.
Battery industry, as an important energy industry, and its rapid development, a variety of new batteries, such as mushroomed, the rapid replacement; it is known that the battery level of pollution of the environment is enormous, and the blind pursuit of battery replacement, ignored its ingredients environmental pollution, is undoubtedly the deteriorating ecological environment worse. Therefore, to develop a non-polluting, low consumption of new energy battery is imminent.
Japan's Sony Corporation, Tokyo, Japan in 2011, "environmentally friendly products -2011" exhibition shows an ability to "digest" the waste and convert it into energy of the battery, the principle is the use of a special, biodegradable waste components Enzymes (Enzyme wood cellulosic) waste paper is decomposed and converted into electrical energy. The new "bio-battery" in the show succeeded in making a miniature fan normal operation, and even showed off a built-in battery of this greeting card. Thus, new energy battery - "bio-battery" is no longer a dream, and become a reality. In fact, back in 2007, Sony had exhibited a "bio-battery" for energy Walkman.
These results indicate that the new energy battery - "bio-battery" reality, innovation and development of the battery industry has an important significance. This "bio battery" and the battery completely different in the traditional sense, it is used in pollution-free enzyme, after use of the problem of environmental pollution is greatly reduced, and it is energizing process break down waste, but We can solve the pollution problem of waste materials. "" Five "national strategic emerging industry development plan" that should "co-ordinate the development of biomass energy, and orderly development of biomass direct combustion power generation", and "bio battery" set pollution and low consumption in one's sense . In the future development of the battery industry, "bio battery" will have a place.
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