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3D printing electrode adds new elements to lithium battery

Date: 2018-08-01
Views: 88
Source: net

According to foreign media reports, the focus of research on lithium battery rings is on electrodes. As components that input or output current in conductive media, scientists continuously adjust their composition and chemical reactions to seek better battery performance. This includes researchers from Carnegie Mellon university who have proposed a new method of grid electrodes in 3D printing technology, they believe that this method has brought " unprecedented improvements".

3D 打印电极为锂电池增添全新的元素

Looking for new and improved lithium battery electrodes has shown many promising possibilities. These involve placing silicon in graphene " cages", developing tiny nanowires, and developing new materials such as silicon. 3D printing has also become a possible way because it can be used to produce electrodes with a porous structure, providing additional channels for electrolyte permeation, thus producing better battery capacity. At present, the best structure is called interdigital geometry, but as Rahul Panat, associate professor of mechanical engineering at Carnegie Mellon university, said, it has an upper limit.

3D 打印电极为锂电池增添全新的元素

" The interdigital geometry is indeed porous and does allow electrolyte to pass through the channel," Panat told new atlas. However, it is a 2D structure, which can only be expanded to 3D by extrusion printing, and its manufacturing method is limited. Panat and a group of mechanical engineers have developed a new 3D printing method to overcome this limitation and allow microcrystalline lattice structures of any size. It involves using the correct surface and inertial force to eject tiny droplets of precise size so that the droplets can adhere in a way that allows the formation of complex 3D structures.

3D 打印电极为锂电池增添全新的元素

" Because of this way, the printed droplets adhere to the pillar instead of falling off the pillar," Panat said. The platen is then heated to remove the solvent so that the column is ready to receive the next drop containing silver nanoparticles. This is a very fast process that continues until a complete crystal lattice is formed. People have not used this mechanism to make batteries before. We have developed this mechanism and are applying for patents. "

3D 打印电极为锂电池增添全新的元素

When used as an electrode in lithium ion batteries, the obtained microcrystalline lattice structure performs well. The team conducted a series of tests in the laboratory and found that the specific capacity of the grid electrode increased fourfold (mAh capacity per unit mass ) and the area capacity increased threefold compared with the standard battery electrode. They retain their complex lattice structure after 40 electrochemical cycles.
" we will seek to try different electrode materials and explore expanding production scale through multi-nozzle systems," Panat explained. In addition, the heating rate can be increased to shorten the evaporation time of the droplets, thus speeding up the process flow. We hope to cooperate with industry partners and investors to provide funds for future commercialization. "
The study is published in the
《Additive Manufacturing》magazine .

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