Battery capacity increased by 60-70%, the volume is reduced by 2/3, cell phone standby time will increase exponentially; battery life of more than 300 km, so that the full popularity of electric vehicles possible ...... Reporter recently from Northwestern University graphene preparation technology and industrial applications The group learned that the team made many breakthroughs in graphene research and industrialization to make these changes possible.
"This solar cell front panel electrode is made of graphene high tap density silver powder developed by the team." At the Northwestern University Optoelectronics Technology and Nanofunctional Materials Laboratory, Professor Wang Hui, head of the research group introduced: "The technology preparation Silver material has the characteristics of high sphericity, good dispersibility, uniform grain size, high tap density and excellent conductivity. "As far as the understanding of 2010, the research group successfully developed the much needed solar cell front electrode for domestic and foreign markets High-density silver powder material, and through small test, pilot and industrial amplification process. At present, on the basis of this, a silver powder material with a tap density close to 6g / cm3 has been developed to the world advanced level. The silver powder material can greatly improve the conversion efficiency and cost of the solar photovoltaic cell.
Large-scale preparation of high-quality, large size, low-cost graphene is the biggest bottleneck in industrialization. Professor Wang Hui said that the group through the "chemical oxidation - reduction method" to natural graphite as raw material, to achieve high-performance graphene batch preparation, batch production reached kilogram level, to solve the graphene preparation process is complex, high energy consumption, production Low rate of defects, in order to achieve graphene large-scale and low-cost preparation provides the basis.
It is said that lithium-ion battery electrodes are an important area of ​​graphene applications. By introducing graphene technology, lithium-ion batteries can simultaneously meet the requirements of energy density and power density in the field of electric vehicles. Up to now, the research group has completed the industrialized amplification test of graphene-modified graphite lithium negative electrode material in quantities of 500 kg, and the product performance has reached the national standard high-performance graphite negative electrode material index. At the same time, the laboratory prepared a variety of more than 1000mAh / g (mAh per gram, mass specific capacity units) of lithium-ion battery anode material, in sync with international research.
Graphene, as the new material of most concern in the 21st century, has a wide range of applications and is the focus of research and competition at home and abroad. It is reported that the research group is actively building a platform to promote gram capacity close to or greater than 500Amh / g lithium-ion battery anode material in our province as soon as possible industrialization.
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