Active material excelling in high-voltage characteristics

Patent metadata

Field	Value
Publication number	US-10553864-B2
Application number	US-201815872234-A
Country	US
Kind code	B2
Filing date	Jan 16, 2018
Priority date	Jan 25, 2013
Publication date	Feb 4, 2020
Grant date	Feb 4, 2020

Abstract

An active material expressed by a general formula; Li a Ni b Co c Mn d D e O f (where 0.2≤“a”≤1, “b”+“c”+“d”+“e”=1, 0≤“e”<1, “D” is at least one element selected from the group consisting of Li, Fe, Cr, Cu, Zn, Ca, Mg, Zr, S, Si, Na, K and Al, and 1.7≤“f”≤2.1) includes a high manganese portion, which is made of a metallic oxide including Ni, Co and Mn at least and of which the composition ratio between Ni, Co and Mn is expressed by Ni:Co:Mn=b2:c2:d2 (note that “b2”+“c2”+“d2”=1, 0<“b2”<1, 0<“c2”<“c”, and “d”<“d2”<1), in a superficial layer thereof.

First claim

The invention claimed is:

1. An active material having a lamellar rock-salt structure, and expressed by a general formula, Li a Ni b Co c Mn d D e O f (where 0.2≤“a”≤1, “b”+“c”+“d”+“e”=1, 0≤“e”<1, “D” is at least one element selected from the group consisting of Li, Fe, Cr, Cu, Zn, Ca, Mg, Zr, S, Si, Na, K and Al, and 1.7≤“f”≤2.1); and
the active material comprising a second superlattice-structure portion in an active-material superficial layer thereof, wherein three arbitrary continuous integrated strengths of an image, which is obtained by observing identical 3b sites in said lamellar rock-salt structure from a <1-100> orientation with a high-angle scattering annular dark-field scanning transmission electron microscope, are expressed in the following order: p1, p2, and q (where 0.9דp1”≤“p2”≤1.1דp1”, “q” is “q”<0.9דp2” when “p1”≤“p2”, or “q” is “q”<0.9דp1” when “p2”≤“p1”).

2. An active material having a lamellar rock-salt structure, and expressed by a general formula, Li a Ni b Co c Mn d D e O f (where 0.2≤“a”≤1, “b”+“c”+“d”+“e”=1, 0≤“e”<1, “D” is at least one element selected from the group consisting of Li, Fe, Cr, Cu, Zn, Ca, Mg, Zr, S, Si, Na, K and Al, and 1.7≤“f”≤2.1); and
the active material comprising a third superlattice-structure portion in an active-material superficial layer thereof, the third superlattice-structure portion exhibiting a seven-set averaged value “n” of intensity ratios being less than 0.9 when the intensity ratios are computed in seven sets by dividing a minimum value of three continuous integrated intensities of an image, which is obtained by observing identical 3b sites in said lamellar rock-salt structure from a <1-100> orientation with a high-angle scattering annular dark-field scanning transmission electron microscope, by a maximum value of the three continuous integrated intensities,
and including three arbitrary continuous integrated strengths of an image, which is obtained by observing identical 3b sites in said lamellar rock-salt structure from a <1-100> orientation with a high-angle scattering annular dark-field scanning transmission electron microscope, are expressed in the following order: p1, p2, and q (where 0.9דp1”≤“p2”≤1.1דp1”, “q” is “q”<0.9דp2” when “p1”≤“p2”, or “q” is “q”<0.9דp1” when “p2”≤“p1”).

Assignees

• Toyota Jidoshokki Kk

Inventors

• Sugie Tsukasa
• Matsushiro Dai
• Harata Masanori
• Fukumoto Takefumi

Classifications

• C01G53/50

  of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2 · CPC title

• H01M4/366 Primary

  as layered products · CPC title

• C30B19/12

  characterised by the substrate · CPC title

• 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

• H01M4/505

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