Laser Technical Data

Lithium ion battery

2018/10/4 / Last updated : 2021/5/23 wired

Relationship between Hole Design on Anode Electrode, the Reaction Temperature and the Rate of Li+ Ion Pre-doping Reaction to Porous Laminated Graphite Anodes

In recent years, in order to improve the performance of secondary batteries, it is strongly desired to improve the charge / discharge capacity of lithium-ion secondary batteries (LIBs) and the performance of sulfur batteries and air batteries, which are considered to be next-generation batteries, to the practical level. It is rare. While various materials are being developed, we believe that it is necessary to establish a lithium ion (Li +) pre-doping method as a basic technology to take the performance of such current secondary batteries to the next step. ing. Wired Co., Ltd.

2018/10/4 / Last updated : 2021/5/23 wired

Technical data / papers

Improvement of Rate Performance of LiFePO4 Cathode with Porous LiFePO4/Activated Carbon Hybrid Electrode Structure

The electrodes produced by forming an LFP layer and an AC layer on each side of the Al current collector foil and then drilling through holes with a laser have a higher discharge capacity at higher current densities than conventional electrodes without holes. It was clarified that the decrease was small and the discharge capacity retention rate was high. Wired Co., Ltd.

2017/11/30 / Last updated : 2021/10/30 wired

Technical data / papers

Fabrication of Porous Graphite Anodes with Pico-Second Pulse Laser and Enhancement of Pre-Doping of Li+ Ions to Laminated Graphite Anodes with Micrometre-Sized Holes Formed on the Porous Graphite Anodes

A process for fabricating porous graphite electrodes having an average pore diameter of 21 μm and an open area of 1% was developed with a system constructed from a pico-second pulse laser and a polygon mirror. The fabricated porous graphite electrodes were used to evaluate the porous design on the graphite electrodes for exhibiting a higher Li+ pre-doping reaction (pre-lithiation) rate with cells in which graphite electrodes were laminated with separators and the laminated graphite electrodes opposite to a Li metal foil through a separator. The results in this study indicate that lithiation proceeds stepwise from the first electrode close to the Li foil to more distant electrodes. The transfer of Li+ ions controlled the lithiation because lithiation did not occur in areas of the electrodes that did not contain pores. In addition, the porous electrodes exhibited a much higher rate of lithiation when compared with electrodes that were prepared by coating a graphite layer on porous current collectors.　　WIRED Co., Ltd.