Secondary Battery  Applications

      Nowadays the Li-ion batteries (LIBs), which are firstly commercialized in 1991, are a popular alternative energy source due to environmental pollution and fossil fuel depletion. The LIBs have many advantages compared to other secondary batteries such as high-power density, high energy density, long lifespan, and low self-discharge rate. LIBs, which have been developed for 30 years, have various issues in performance and manufacturing processes. We are proposing a solution to various issues of conventional LIBs through laser processing. 

      We are researching on cutting electrodes by laser to reduce defects caused by wear on tools and to provide a high quality cutting edge. The LIBs have problems related to the thickness and density of the active material layer. 

      We tried to make 3D electrodes by laser structuring technology. The Li-ion diffusion rate of 3D electrodes is improved due to the formed groove by laser. Consequently, power density reduction can be minimized although the active material layer is thick and dense. 

      Currently, commercial LIBs include graphite anode, and the capacity of conventional LIBs has almost reached its limit. Therefore, an anode with a capacity higher than graphite anode is needed to obtain a higher capacity battery. Lithium metal is expected to be a material to solve this problem. We plan to control Li dendrite growth by inducing Li+ into grooves, which is formed by laser (lighting rod effect).

To be updated

To be updated

To be updated

To be updated

           The manufacturing of lithium-ion batteries is raising the interest of manufacturers due to the massive demand of this battery in the power supply and energy storage system industry. Above all, joining in the battery should be considered as the most important factor because it affects not only mechanical properties but also the working duration of the battery. The existing joining technologies in the battery have shown significant drawbacks and limitations. This is due to the different materials involved as well as the characteristics of the joining technology itself. Fortunately, researchers have found the most suitable substitute method using a laser beam. 

       We are conducting laser welding for the battery case and tab in cylindrical battery cells using cost-effective laser technology. 

       Another research is carried out on the laser welding of dissimilar Cu-Al. This is a typical weld-in battery as the materials of Al and Cu are the most common materials used in the battery. In this study, we aim to reduce the weld defects such as porosities, voids, and spatters

To be updated