2012 Volume 55 Pages 38-47
The needs for the secondary battery are apparently growing considerably to cope with the problems from the viewpoints of energy and environmental issues of the world. On the other hand, the nanoparticles having large specific surface area and special features have been used to increase the functionality of materials for the secondary batteries. In this report, the focus is placed on the powder processing of materials for the electrodes of lithium ion battery and several examples of applications of nanoparticles to this battery are introduced by referring to mainly the patent applications by use of particle composing machines developed by our company.
They are classified into two cases to make the positive electrode and negative one. For the former, various type of carbon nanoparticles including nanofibers usually are dispersed with the active material of the positive electrode in various forms using the particle composing machines. For the latter, the graphite particles are often used for the negative electrode and processed for particle design like particle composing, surface modification and sphericalization by use of the particle composing machines, which leads to the improvement of performance of the lithium ion battery in various aspects.
