Battery Innovation Zatan
"Batteries not included, including" can still recall receiving a new toy, the box side to give you the words poured cold water? Grow up, our high-tech "toys" have become increasingly complex and fascinating. But the driver of their battery works has not changed.
If so it?
Smart grid (Smartgrids), hybrid, renewable energy, environmental technology is popular, but behind the scenes, chemists and engineers are committed to reducing the ecological impact of the battery. Recent NiOOH, olivine-type lithium iron phosphate, nanowires and other nickel, lithium battery chemistry that breakthrough is expected to make tomorrow a variety of digital products, but to give up a lot of problems a long history of alkaline / manganese dioxide AA batteries.
Hydroxy-nickel oxide (NiOOH or NiOx) battery has been around for several years, similar to alkaline batteries, but the nickel-based anode to generate higher voltages (1.7V, Alkaline battery 1.5V). NiOx batteries are generally used for high power applications (such as digital cameras or portable gaming products), is said to provide the equivalent of twice the life of alkaline batteries. However, in remote low-power applications, NiOx battery life with alkaline batteries fairly.
First, the recent Sony lithium-ion battery technology, commercial varieties. The technology developed by American researchers, the use of olivine-type lithium iron phosphate (LiFePO4) as a negative.
First, the recent Sony lithium-ion battery technology, commercial varieties. The technology developed by American researchers, the use of olivine-type lithium iron phosphate (LiFePO4) as a negative. Sony and the new negative electrode material is said to minimize the resistance of a patented combination of particle design technology to realize the 3.3V output, 1800W/kg power density rechargeable battery design, with a long life, filling in 2000 / discharge capacity remained 80% of the original. The battery has a fast charge capability (30-minute charge to 99%), and used to maintain stable discharge voltage.
Sony, the battery has been used in some powerful tools and practical applications received positive feedback.
LiFePO4 technology first patented by the University of Texas JohnGoodenough and his team achieved in 1996. LiFePO4 as a solution of lithium cobalt oxide and lithium manganese oxide structure such as lithium-ion battery discharge rate and short life cycle problem of the program was designed.
LiFePO4 is a highly stable material, scientists believe it can be used for many consumer applications, from mobile phones and gaming products, rechargeable batteries to electric cars and other large applications. (Upcoming Chevrolet Volt uses lithium-ion battery 220).
LiFePO4 olivine lattice deformation of the structure so that cell structures much smaller than the other, lead to better discharge process. Therefore the material extremely long cycle life, LiFePO4 also showed excellent storage life. It can tolerate oxidative and acidic environment.
In terms of battery safety, LiFePO4 battery structure in 300 ° C to 500 ° C can still maintain a very high temperature stability, the maximum withstand 700 ° C. In such extreme temperatures, cracking or other lithium battery will explode.
LiFePO4 fast charge, long-life characteristics significantly contribute to environmental protection. LiFePO4 battery electric vehicles use charge will be traveling longer distances, looking to introduce products to compete with the Volt car makers might be interested.
Nanowire battery becoming a prospect of a solution
Another promising technology is the nanowire lithium batteries, to cover the stainless steel cathode silicon nanowire lithium battery to replace the traditional graphite anode. Silicon can store ten times more lithium than graphite, so that power density has increased significantly. Reduce the total mass of the battery, the increase in surface area allows for faster charge / discharge rate.
Battery cathode surface covered by silicon steel wire contraction / expansion of output power. Charging process, the silicon-ray absorptiometry on a charge of lithium atom, the expansion occurred; discharge process, the silicon line of lithium-ion being sucked away, silicon linear shrinkage.
Traditional, simple silicon positive study began thirty years ago. Scientists then decided to abandon the silicon, because the material is easy to muster when the absorption of lithium split, damaged, resulting in cathode capacity is too weak, not enough to support further research.
Researchers at Stanford University was used to determine the problem stems from the shape of silicon.
The present system is one-thousandth the thickness of paper to switch to a diameter of the tree nanowires. Volume after absorbing lithium nanowires extended to four times the normal state, but the silicon cathode without breaking or injury.
Nanowire battery researchers are looking for a suitable anode material made to match with the silicon net positive charge / discharge capacity, in order to fully demonstrate the technology in the energy storage density of the outstanding progress. Stanford University Assistant Professor of Materials Science and Engineering, is leading a team to develop the YiCui cathode technology, they believe that five Hou Nami lithium-ion rechargeable battery cable technology to achieve full commercialization.
Several techniques above is just the beginning, with the in-depth research to continue to the battery, electronics players can expect battery life of their own life more than toys that day.
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