A lithium nickel complex oxide, a process for preparing the...

Details A lithium nickel complex oxide, a process for preparing the... A lithium nickel complex oxide, a process for preparing the...

C - Chemistry, Metallurgy

01

G

C01G 53/04 (2006.01) C01G 53/00 (2006.01) H01M 4/48 (2006.01) H01M 4/52 (2006.01) H01M 4/50 (2006.01)

Patent

CA 2209933

A process for preparing a lithium nickel complex oxide having the formula (I) Li y-x1Ni1-x2M x O2 (I) wherein M represents a metal from Al, Fe, Co, Mn or Mg, x=x1+x2, and (i) when M is Al or Fe, then 0 < x <= 2.0, x1=0 and x2=x; (ii) when M is Co or Mn, then 0 < x <= 0.5, x1=0 and x2 =x; (iii) when M is Mg, then 0 < x < 0.2, 0 < x1 <= 0.2 and 0 < x2 <= 0.2; and y represents 0.9 <= y < 1.3, comprising: (a) reacting a basic metal salt of the formula (II) Ni1-x M p x(OH)2-nz(A n-)[z+(px-2x)/n] .cndot. mH2O (II) wherein M represents Al, Fe, Co, Mn or Mg, p is 2 <= p <= 3, A n- is an anion having the valence n, and x, z and m are positive numbers satisfying the ranges: 0 < x <= 0.2; 0.03 <= z <= 0.3; and 0 <= m < 2; with a water soluble lithium compound in an aqueous medium in a molar ratio Li/(Ni+M) of 0.9-1.3 to obtain a slurry, (b) spray drying the slurry; and (c) heating the dried material at a temperature of about 600 °C - 900 °C for at least 4 hours in an oxidative atmosphere. The crystals obtained by the process are sufficiently developed and highly purified for use as a positive electrode material for a secondary battery in which the decreased rate of discharge capacity at 100th cycle based on the initial discharge capacity is 10% or less.

Ce matériau actif positif, destiné à des batteries secondaires, comprend un oxyde composite lithium-nickel représenté par la formule générale Liy-x1Ni1-x2MxO2 où M représente un élément choisi dans le groupe composé de Al, Fe, Co, Mn et Mg, x = x1 + x2, 0 </= x1 < 0,2, 0 < x2 </= 0,5, 0 < x </= 0,5, et 0,9 </= y </= 1,3. Ses cristaux sont développés de façon satisfaisante et de haute pureté, et il présente une stabilité excellente en cas de décharge.

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