Categorized | Research, Science

The Li-ion Battery with High Charge and Energy Capacity

bateryEnergy experts have been looking for the next hit in energy technology which can be used as a substitute for the lithium-ions batteries that are used in smartphones, laptops as well as cars. It seems that the designers will have to rethink about the currently used li-ion battery. Researchers from the Northwestern University have designed a li-ion battery that has a higher energy capacity than the current battery.

The catch that comes with the modified anode brings about two main issues which are holding back the batteries charge capacity as well as the charge rate. The li-ion batteries operate in a manner where the lithium ions are moved between the cathode and anode. As the device uses the battery energy, the ions move from the anodeto the cathode through the electrolyte. Electrical energy moves to the device when ions diffuse through the electrolyte medium. During charging, the ions move from the cathode to the anode contrary to what happens when energy is used by a device.

The recent anode designs are made using graphene sheets which store ions. These layers of sheets are one atom thick. These anodes are only able to store an atom of lithium for the six carbon atoms and this results to a low charge density. The researchers have also used other materials such as silicon which holds four atoms of lithium for all silicon atoms. However silicon has a disadvantage in that it expands and contracts unnecessarily during charging. This action results in the fragmentation of silicon and a reduces the energy capacity of the battery.

A graphene-based anode design has the effect of slowed charge rate. This is because the graphene sheets geometry is thin and long therefore the ions have to move through longer distances before reaching the ends of the sheets and get inside the anode.

The NU team looked at these problems by reviewing the anode and sorting to use a hybrid a graphene-silicon design in order to boost charge rate and charge capacity simultaneously. They firstly sandwiched silicon layers between the sheets of graphene in order to allow more ions of lithium to stay in the structure. The silicon layer still contracts and expands in the structure, however, the graphite layers flexibility holds the anode structure together. The silicon layer still can fragment but the anode structure remains in position and therefore the anode can hold more charge.

The NU research team went on and applied chemical oxidation to punch small holes on the graphene sheets of about 10-20 nanometers wide, in order for the lithium ions to travel through the graphene instead of going round the anode edges. Their movement is likely to cause a jam. This created shortcut allows the lithium ions to converge at the anode more quickly during charging and this increases the charge rate to a higher value. The researchers are thinking about the cathode just as they have looked into the anode matter. This is in an effort to improve the energy capacity of the li-ion battery.

Comments are closed.

Children like to be challenged

If you want to find educational toys that your youngsters will take pleasure in enjoying with, the most effective factor to do is have them check it out.

Recent Posts

Monitoring Software

The Internet can be tricky for parents to deal with because kids often need to use the Internet for school, but parents parents are often worried about the various activities that their children might be engaged in. Peer-to-peer file sharing can lead to lawsuits and even a criminal prosecution. Some teens might engage in activities online that are embarrassing to the family or may lead to viruses or hackers accessing the computer. Fortunately, there are various forms of monitoring software that can offer parental control.

Monitoring software can also be very helpful when parents are trying to learn what their children are up to, such as whether they are attending class or doing their homework.

Many teens use the computer purchased specifically for schoolwork to play computer games or chat with friends. Monitoring software can not only record activities on the computer, but smartphone software such as Mobile Spy can silently record the teen's GPS information, text messages and phone call information.

Monitoring software sits silently on a computer or mobile device and monitors all of the activities carried out on the device, encouraging the teen to consistently use the device for communication. Activity is usually uploaded to an online account so that the parent can monitor activity from anywhere without having to get close to the phone. This is crucial since parents will usually not have physical access to the phone without arousing suspicion.

Many monitoring programs also come with keystroke loggers, which log keys recorded on the computer, a contextual blocker, and features that allow parents to block certain websites. All of these features allow parents to have a peace of mind when allowing their teens to use the Internet.