Preparation Of High Lithium Ion Conductive Glass-ceramics Solid Electrolytes In The Liti_2(po_4)_3 System By The Mechanochemical Method And Their Application As Coating Materials Of Licoo_2

摘要

Amorphous fine powder in the Li_2O-Al_2O_3-TiO_2-P_2O_5 (LATP) system were prepared directly from a mixture of Li_2O, Al_2O_3, TiO_2, and P_2O_5 as starting materials using a mechanical milling technique at room temperature. LATP glass-ceramics were obtained by heat treatment of the mechanochemically prepared amorphous powder over the crystallization temperature. X-ray diffraction peaks due to LiTi_2(PO_4)_3 and AlPO_4 crystals for LATP glass-ceramics were observed. Thus, high lithium ion conducting LATP glass-ceramics solid electrolytes were prepared successfully from the mechanochemically prepared amorphous powder. The LATP glass-ceramic fine particles were investigated as coating materials of LiCoO_2 cathode in lithium ion batteries. The LATP glass-ceramics coated LiCoO_2 electrode materials exhibited a good charge-discharge performance for charging up to a high voltage (4.5 V vs. Li/Li).