| 摘要 |
<p>Provided is a process for preparing a nanoparticle powder of lithium transition metal phosphate, involving synthesis of lithium transition metal phosphate (LiMPO<SUB>4</SUB>) (M = Fe, Mn, Co, Ni, Ti, Cu or any combination thereof) into a nanoparticle powder having a particle size of less than 100 nm to thereby significantly reduce a diffusion distance of lithium ions within particles, which consequently results in full exploitation of a capacity of an electrode material corresponding up to a theoretical capacity thereof and formation of nanoparticles having a high electrical conductivity within a short period of time, and which is also capable of achieving efficient industrial-scale production of a desired compound via a heat treatment at a low temperature of less than 600<SUP>0</SUP>C for a short period of time of less than 4 hours while overcoming a shortcoming of a low electrical conductivity, using solid raw materials. The process comprises mixing lithium, a transition metal and a phosphorus-containing salt as starting materials, with addition of any one element selected from the group consisting of sodium (Na), potassium (K), lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), samarium (Sm), gadolinium (Gd) and erbium (Er) in an amount of less than 10 at% to thereby inhibit nucleation in a first heat treatment, subjecting the reactants to first heat treatment at a temperature of 25O<SUP>0</SUP>C to 400<SUP>0</SUP>C for 2 to 10 hours, and subjecting the first heat-treated materials to a second heat treatment at a temperature of 400<SUP>0</SUP>C to 700<SUP>0</SUP>C for 2 to 24 hours to uniformly form crystalline nuclei to induce growth of nanocrystalline particles.</p> |
