LiNi_0.5Mn_1.5O₄ ナノ粒子造粒体の機械的合成とその形成機構

抄録

LiNi_0.5Mn_1.5O₄ is one of the promising cathode materials for high-energy Li-ion batteries. The development of a low-cost and environmental-friendly synthetic method of the LiNi_0.5Mn_1.5O₄ powder is an important topic for large scale production. In this paper, we have prepared LiNi_0.5Mn_1.5O₄ granules consisting of nanoparticles by a simple mechanical method using an attrition-type mill. The formation mechanism of LiNi_0.5Mn_1.5O4 granules was investigated from the powder properties of products prepared during the mechanical treatment of starting materials. The initial step of this formation reaction is a pulverization of starting materials. With increasing treatment time, the nano-sized LiNi_0.5Mn_1.5O₄ particles are formed and then these particles are granulated with the size of few micrometers. The charge and discharge properties of cathodes made from the prepared LiNi_0.5Mn_1.5O₄ granules were also tested. The present work may lead to the development of a scalable synthetic method of high-purity powders by the simple mechanical process at room temperature.