Nanografi Nanotechnology

The performance of  lithium-ion batteries  that we have started to use in electronics almost every day, depends on the properties of the materials that they are produced of. Generally the materials that are used for the production of lithium ion batteries are expensive to be produced and they offer limited energy storage possibility. Thus, it is very important to develop new types of lithium ion batteries which should be simplified, efficient and environmentally friendly. For this purpose lithium iron phosphate which discovered in the late 1990s and is currently the most studied  cathode material for lithium-ion batteries . Lithium iron phosphate  is a desirable cathode material due to its outstanding features, like low cost, superior thermal stability, enhanced safety, high theoretical specific capacity and suitable charge/discharge voltage plateau. Since there is a strong P-O covalent bond in lithium iron phosphate, it is thermodynamically and dynamically stab...

In  lithium ion batteries  it is very important to choose a good binder for the electrodes. There are some requirements that the binder has to meet to have durability and long cycle life. The binder should be chemically inert and electrochemically stable to get the best performance from lithium ion batteries. The other important point is that these properties should be gotten by lower amounts of binders. One of these binders that meet the requirements is  Polytetrafluoroethylene (PTFE) Condensed Liquid Binder for Li-ion Battery . PTFE is a synthetic fluoropolymer of tetrafluoroethylene that has numerous applications. PTFE is a fluorocarbon solid, as it is a high-molecular-weight compound consisting of carbon and fluorine. PTFE is hydrophobic material; so, it does not interact with water or water containing substances because of the London forces due to high electronegativity of fluorine.  PTFE binders has a CF 2 -CF 2  unit which demonstrates excellent chem...

Nowadays there is a rapid development in lithium ion batteries because of their usage in electronics like mobile phones and electric vehicles. There are basically  anode  and  cathode  parts of lithium ion batteries and when we look at the cathode part we can see that it consists of particles of active material and inactive materials. For inactive materials we can give conductive additives as an example. Conductive additive plays a role in increasing in the electric conductivity. For conductive additives carbon black can be given as an example.  Conductive Carbon Black for Lithium Ion Battery Applications  optimizes the electrical conductivity of the positive electrode but is not involved in the electrochemical redox process in lithium ion battery. Actually the main duty of carbon black in lithium ion battery is to contribute to enhancing the cathode cyclability by filling the free spaces in between the particles of active material. So by this action t...

As all we may know  lithium ion batteries  include cathode and anode parts. One of the most used material for anode part is graphitic carbon. Graphitic carbon is chosen for long cycle life and low cost. But there are some problems with  graphitic carbon  such as safety and low lithium ion diffusivity in the graphite lattice. In the studies related to this field it was found that lithium titanate oxide which has the chemical formula of Li 4 Ti 5 O 12  can be used as alternative anode material to graphitic carbon.  Lithium Titanate Oxide Micron Powder (LTO) for Li-ion Battery Anode  shows stable charge/discharge platform and possesses excellent cycling stability and unique safety characteristic owing to its negligible volume change and high redox potential upon Li-ion intercalation/deintercalation. Of course, the studies are going on to improve the performance of lithium titanate oxide as anode materials. However, coarse lithium titanate shows poor ...

Lithium ion batteries  are widely used in consumer electronics like laptops and cellular phones. Since lithium ion batteries produced, there have been many technological developments to increase their performance. One of the most important issues for lithium ion batteries is to work on low temperatures for the applications in aerospace, military and electrical vehicles. In the studies related to this topic it is widely observed that the insertion and extraction of lithium is more difficult at low temperatures. For this purpose, some polymers were studied on and it was seen that most polymers at room temperature show the familiar polymeric properties of material flexibility and high resistance to cracking. But as the temperature decreases, these polymers become hard and brittle. So, it can be said that a poorly chosen  binder  system may cause impact damage to the electrode, like electrode cracking, peeling of the structure and manufacturing imperfections. To solve thi...

Lithium ion batteries  becomes a very important technology for our daily life. They are widely used in mobile phones, laptops and electrical vehicles. In current lithium-ion battery manufacturing for automotive, different sizes and shapes of cells are being manufactured. The difference between electronic devices like mobile phones or laptops, automotive battery packs consists of a large number of battery cells, sometimes several hundreds to meet desired power and capacity needs. As a result, a significant amount of joining such as welding is needed to deliver electricity in a battery pack. It is not possible to say that it is easy to join all of these  battery cells . Also when we think of the harsh environment of an automobile expose like vibration, severe temperature, and possible crash, all of these can affect the performance of these batteries. The scientists shows a great effort to get better performance from lithium ion batteries in terms of cell material, design,...

In the past two decades with the prevalence of portable consumer electronics, the demand for rechargeable energy storage sources of high energy density and low weight has been growing rapidly. Currently larger applications such as zero emission electric vehicles and satellites put up even more stringent requirements for energy storage devices in both energy density and power density. In all of these applications high performance  batteries  are more and more desired. Lithium ion batteries  are good materials for this high performance demand. There are different methods and chemicals for the production of lithium ion batteries. A lithium ion battery cell is composed of two electrodes, which are the anode and cathode, a separator, and an electrolyte. Generally, the electrodes are fabricated by applying coating slurry onto a metallic foil. One of the metallic foils that are used in lithium ion battery anode parts is  copper foils. Among different conductive substra...