Nova Patents
EP0806397A1

Lithium-nickel composite oxide, process for preparing the same, and positive active material for secondary battery

Abstract

There can be provided a novel lithium nickel complex oxide represented by the general formula:         Liy-x1Ni1-x2MxO2    (wherein M represents one selected from the group consisting of Al,Fe, Co, Mn and Mg, x = x1 + x2, 0 < x1 ≦ 0.2, 0 < x2 ≦ 0.5, 0 < x ≦ 0.5, and 0.9 ≦ y ≦ 1.3), wherein the crystals have been suffciently developed and are highly purified, and a positive electrode active material for a secondary battery whose stability of high dischage capacity is excellent.

EP0806397A1, drawing sheet 1
Sheet 1 of 65

Term

Term ended

Projected expiry passed 22 November 2016, 9.8 years ago.

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7 claims: 2 independent, 5 dependent

  1. 1
    A lithium nickel complex oxide represented by the general formura (I)         Li y-x1 Ni 1-x2 M x O 2      (I)    [wherein M represents one selected from the group consisting of Al, Fe, Co, Mn and Mg, x = x 1 + x 2 , (herein (i) when M is Al or Fe, and x, x 1 and x 2 represent respectively 0 < x ≦ 0.2, x 1 = 0, x 2 = x (ii) when M is Co or Mn, and x, x 1 and x 2 represent respectively 0 < x ≦ 0.5, x 1 = 0, x 2 = x (iii) when M is Mg, and x, x 1 and x 2 represent respectively 0 < x ≦ 0.2, 0 < x 1 < 0.2, 0 < x 2 < 0.2), and y represents 0.9 ≦ y ≦ 1.3], whose X-ray diffraction pattern shows a ratio in the peak intensity of the face (003) to the face (104) i,e., (003)/(104) is 1.2 or higher and a ratio in the peak intensity of the face (006) to the face (101) i,e., (006)/(101) is 0.13 or lower, said face being defined by Miller indices hkl, and which has a BET specific surface area of 0.1 ∼ 2 m 2 /g, the proportion of Ni 3+ to the total Ni being 99 % by weight or higher, an average particle size D being in the range of 5 ∼ 100 µm with 10 % of the particle size distribution being 0.5D or more and 90 % 2D or less, and sphenical secodary particle whose surface being uneven as observed with a scanning electron microscope (SEM) and primary particle constituting the sphenical secondary particle being uniform and distributed in the range of 0.2 ∼ 3.0 µm in terms of long diameter with its average size of 0.3 ∼ 2.0 µm as observed with a SEM.
  2. 3
    A lithium nickel complex oxide represented by the general formura (I)         Li y-x1 Ni 1-x2 M x O 2      (I)    [wherein M represents one selected from the group consisting of Al, Fe, Co, Mn and Mg, x = x 1 + x 2 , (herein (i) when M is Al or Fe, and x, x 1 and x 2 represent respectively 0 < x ≦ 0.2, x 1 = 0, x 2 = x (ii) when M is Co or Mn, and x, x 1 and x 2 represent respectively 0 < x ≦ 0.5, x 1 = 0, x 2 = x (iii) when M is Mg, and x, x 1 and x 2 represent respectively 0 < x ≦ 0.2, 0 < x 1 < 0.2, 0 < x 2 < 0.2), and y represents 0.9 ≦ y ≦ 1.3], whose X-ray diffraction pattern shows a ratio in the peak intensity of the face (003) to the face (104) i,e., (003)/(104) is 1.2 or higher and a ratio in the peak intensity of the face (006) to the face (101) i,e., (006)/(101) is 0.13 or lower, said face being defined by Miller indices hkl, and which has an average long diameter of the primary particle of 1 ∼ 10 µm as observed with a SEM.
Independent claims2