Skip to main content

Improving the Performance of Li-ion Batteries with Graphene

The need for electric energy storage systems are in increasing demand. Lithium-ion batteries represent the best option for many applications such as hybrid and electric vehicles which require high energy density, cycle durability and charge/discharge efficiency. Li-ion batteries have been used in many electronic devices since their production in 1990. The components of the cell are primarily the positive and negative electrodes and the electrolyte. The positive electrode is a metal oxide, negative electrode is made of carbon and the electrolyte is a lithium salt in organic solvent. The improvement in the performance of the battery can be done by the introduction of new materials with superb properties. Graphene which is one of the best materials discovered by humans has opened new possibilities in the field of lithium ion battery materials due to its light weight, high electrical conductivity, superior mechanical flexibility, and chemical stability.
Graphene can be used in both positive and negative electrodes of the battery. In the positive electrode, the cathode, it is used as a lithium metal oxide-graphene composites which enhance the electrochemical properties of the battery by increasing the diffusion kinetics of the lithium ion and improve the stability across a wide voltage range in crystalline oxide-graphene composites. In the negative electrode, the anode, the addition of graphene to anode materials has led to superior electrical conductivity, high surface area (2620 m2/g), high surface-to-volume ratio, and ultra-thin thickness. These excellent properties can shorten the diffusion distance of ions, structural flexibility, thermal and chemical stability which guarantee its durability in harsh environments1.
Reference:
1. Zhu, J., Duan, R., Zhang, S., Zhang, Y. & Zhu, J. Recent development of graphene in lithium ion battery electrode materials. Springerplus 3, 1–8 (2014).
Posted by 
Labels:

Comments

Post a Comment

Popular posts from this blog

Molybdenum Trioxide Nanoparticles/Nanopowder and Applications

General Information about Molybdenum Trioxide                                                     Molybdenum trioxide is chemical compound with the formula MoO3. Its chief application is as an oxidation catalyst and as a raw material for the production of molybdenum metal.  Molybdenum Trioxide  is a very light blue powder. Molybdenum Trioxide Nanoparticles/Nanopowder and Their Applications                                                    Like many  nanoparticles/nanopowder , Molybdenum Trioxide nanoparticles/nanopowder are used as catalysts. These catalysis reactions include hydrogenation catalysis and cracking catalysis. Molybdenum Trioxide nanoparticles/  nanopowder are useful for...
Post a Comment
Read more

Rundown about Silicon Oxide Wafer

The main insulating material used in micro-technology is Silicon Dioxide, which in chemical symbols is written as SiO2. In semiconductor technology, SiO2 thin film layers are mainly used as dielectric material film in transistors, capacitors (DRAM) or flash-memories. Silicon Oxide Wafers are produced using crystallization, solid state and other ultra-high purification processes such as sublimation. This process forms a cylindrical ingot, which is then sliced and polished to form wafers. Thermal oxide is a kind of "grown" oxide layer, compared to CVD deposited oxide layer, it has a higher uniformity, and higher dielectric strength, it is an excellent dielectric layer as an insulator . In most silicon- based devices, thermal oxide layer play an important role to pacify the silicon surface to act as doping barriers and as surface dielectrics. The simplest way to produce an insulating silicon oxide layers (SiO2) on silicon wafers is to oxidize silicon with oxygen, which ...
Post a Comment
Read more

Hydroxyapatite Nanopowders and Their Applications

Hydroxyapatite, is a naturally occurring mineral form of calcium apatite with the formula Ca 5 (PO 4 ) 3 (OH). Pure hydroxyapatite powder is white. Naturally occurring apatites can, however, also have brown, yellow, or green colorations, comparable to the discolorations of dental fluorosis. Hydroxyapatite Nanopowder/Nanoparticles (50 nm, 99.95+%)  has been widely used as a biocompatible ceramic in many areas of medicine, but mainly for contact with bone tissue, due to its resemblance to mineral bone. In mammals, the skeleton presents a carbonated and partially substituted apatite, based on nanocrystal aggregates, and associated with collagen, building up 3-D structures present in various bone tissue conformations like trabecular or cancellous bone. There has been growing interest in developing bioactive synthetic ceramics that could closely mimic natural apatite characteristics. As mentioned before,  Hydroxyapatite Nanopowder  is the main inorganic constituent of bon...
Post a Comment
Read more