C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
C01G 31/00 (2006.01) C01G 51/00 (2006.01) C01G 53/00 (2006.01) H01M 4/24 (2006.01) H01M 4/48 (2006.01) H01M 4/52 (2006.01)
Patent
CA 2148730
A method for preparing cathode material for use in lithium secondary batteries comprising the steps of: (a) mixing first and second reactants in a appropriate stoichiometric ratio to form a reaction mixture, wherein the first reactant is represented by LixMO2, M is either Ni or Co, and x is a variable from 0.25 to 1.1, and the second reactant is V2O3, V2O5, or NH4VO3; and (b) sintering the mixture in air at temperatures between 650°C ~ 700°C for 1 ~ 2 hours to obtain a cathode material represented by LiMVO4. The first reactant can be obtained by an aqueous-phase reaction by mixing a first aqueous solution, which contains M(NO3)2.6H2O, and a second aqueous, which contains LiOH.H2O, Li2O, Li2CO3, or Li(CH3COO), to form a precursory aqueous solution, and drying the precursory aqueous solution. Very high purity cathode materials can be obtained at a substantially reduced reaction time and substantially reduced reaction temperature, both of which will contribute to reduced production cost. The lithium secondary batteries so prepared can provide discharge voltages between 4.5 ~ 4.9 volts.
Borden Ladner Gervais Llp
Industrial Technology & Research Institute
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