Positive electrode active substance, positive electrode material, positive electrode, and non-aqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-2016006031-A1
Application number	US-201414771106-A
Country	US
Kind code	A1
Filing date	Feb 27, 2014
Priority date	Feb 28, 2013
Publication date	Jan 7, 2016
Grant date	—

Abstract

[Object] Provided is a means which is capable, with respect to a non-aqueous electrolyte secondary battery, of suppressing a decrease in capacity when the battery is used for a long period of time, and improving cycle characteristics.
[Solving Means] Disclosed is a positive electrode active substance for a non-aqueous electrolyte secondary battery comprising a composite oxide containing lithium and nickel, in which the positive electrode active substance has a structure of secondary particles formed by aggregation of primary particles, the average particle diameter of the primary particles (D 1 ) is 0.9 μm or less, and the average particle diameter of the primary particles (D 1 ) and the standard deviation (σ) of the average particle diameter of the primary particles (D 1 ) meet the relationship of D 1/σ 2 ≧24.

First claim

1 .- 15 . (canceled)

15 . A positive electrode active substance for a non-aqueous electrolyte secondary battery comprising a composite oxide containing lithium and nickel,
wherein the positive electrode active substance has a structure of secondary particles formed by aggregation of primary particles, the average particle diameter of primary particles (D 1 ) is 0.9 μm or less, the average particle diameter of the primary particles (D 1 ) and the standard deviation (σ) of the average particle diameter of the primary particles (D 1 ) meet the relationship of D 1 /σ 2 ≧24, and the tap density of the positive electrode active substance is 2.3 g/cm 3 or more.

17 . The positive electrode active substance according to claim 16 , wherein the composite oxide comprises a composition represented by General Formula: Li a Ni b Mn c Co d M x O 2 (with the proviso that, in the formula, a, b, c, d, and x satisfy 0.9≦a≦1.2, 0<b<1, 0<c≦0.5, 0<d≦0.5, 0≦x≦0.3, and b+c+d=1; and M represents at least one selected from the group consisting of Ti, Zr, Nb, W, P, Al, Mg, V, Ca, Sr, and Cr).

18 . The positive electrode active substance according to claim 17 , wherein b, c and d are as follows: 0.44≦b≦0.51, 0.27≦c≦0.31, and 0.19≦d≦0.26.

19 . The positive electrode active substance according to claim 16 , wherein the crystallite diameter of the positive electrode active substance is 0.4 μm or less.

20 . The positive electrode active substance according to claim 16 , wherein the BET specific surface area of the positive electrode active substance is 0.1 to 1.0 m 2 /g.

21 . The positive electrode active substance according to claim 16 , wherein the diffraction peak of a (104) surface and the diffraction peak of a (003) surface of the positive electrode active substance obtained by powder X ray diffraction measurement have a diffraction peak intensity ratio ((003)/(104)) of 1.28 or more and a diffraction peak integrated intensity ratio ((003)/(104)) of 1.05 or more.

22 . A positive electrode material for a non-aqueous electrolyte secondary battery, the positive electrode material comprising:
a core part comprising the positive electrode active substance according to claim 16 ; and a shell part comprising a lithium-containing composite oxide which is different from the positive electrode active substance.

23 . A positive electrode material for a non-aqueous electrolyte secondary battery, the positive electrode material being formed by containing in a mixed state of the positive electrode active substance according to claim 16 and a spinel type manganese positive electrode active substance.

24 . The positive electrode material according to claim 23 , wherein the mixing weight ratio of the positive electrode active substance and the spinel type manganese positive electrode active substance is 50:50 to 90:10.

25 . A positive electrode for a non-aqueous electrolyte secondary battery, the positive electrode being obtained by forming, on a surface of a positive electrode current collector, a positive electrode active substance layer containing at least one selected from the group consisting of the positive electrode active substance according to claim 16 and a positive electrode material being formed by containing in a mixed state of the positive electrode active substance and a spinel type manganese positive electrode active substance.

26 . A non-aqueous electrolyte secondary battery comprising a power generating element comprising:
the positive electrode according to claim 25 , a negative electrode obtained by forming a negative electrode active substance layer on a surface of a negative electrode current collector, and a separator.

27 . The non-aqueous electrolyte secondary battery according to claim 26 , wherein the separator is a separator having a heat resistant insulating layer.

28 . The non-aqueous electrolyte secondary battery according to claim 26 , wherein the ratio value of a battery area (projected area of a battery including an outer casing body of a battery) to rated capacity is 5 cm 2 /Ah or more and the rated capacity is 3 Ah or more.

29 . The non-aqueous electrolyte secondary battery according to claim 26 , wherein the aspect ratio of an electrode defined as a longitudinal/transversal ratio of a rectangular positive electrode active substance layer is 1 to 3.

Assignees

• Nissan Motor

Inventors

• Kaseda Manabu
• Ibuka Shigeo
• Tanizaki Hiroaki
• Nagano Kodai
• Uwai Kenta

Classifications

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M4/505 Primary

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title