For example, when manufacturing nickel-based materials as precursors for lithium-ion batteries, doping aluminum to the nickel increases thermal stability and improves safety. In this process, we not only simply mix multiple elements such as nickel and aluminum, but also co-precipitate them (a method of precipitating multiple elements simultaneously to create a homogeneous precipitation while maintaining proportionality) to produce products in which the elements are uniformly dispersed, down to the atomic level, inside the particles. In order to achieve uniform dispersion and co-precipitation of multiple elements, it is necessary to optimally control reactions according to the species and ratios of the elements to be mixed. Based on our knowledge and expertise, we have the technology to co-precipitate multiple elements under appropriately controlled conditions.