US11283071B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11283071-B2 |
| Application number | US-201715587859-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 5, 2017 |
| Priority date | May 9, 2016 |
| Publication date | Mar 22, 2022 |
| Grant date | Mar 22, 2022 |
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
What the patent document calls the invention.
A short plain-language summary of the technical disclosure.
Who owns or filed the patent and who is credited as inventor.
Filing, priority, publication, and grant dates set the timeline.
The legal scope of protection — read this for what is actually claimed.
Technology tags used to group this patent with similar filings.
Prior art links and similar publications in this corpus.
Official abstract text for this publication.
A cathode active material with high durability and a lithium ion secondary battery. The cathode active material is a cathode active material represented by a general formula Li(1+a)NixCoyMnzWtO2 (−0.05≤a≤0.2, x=1−y−z−t, 0≤y<1, 0≤t<1, 0<t≤0.03), wherein the cathode active material satisfies the following formula (1):σ1/t1≤0.92 (1)where t1 is an element concentration average of insides and grain boundaries of primary particles of a W element, and σ1 is an element concentration standard deviation of the insides and grain boundaries of the primary particles of the W element.
Opening claim text (preview).
The invention claimed is: 1. A cathode active material represented by a general formula Li (1+a) Ni x Co y Mn z W t O 2 , wherein −0.05≤a≤0.2, x=1−y−z−t, 0≤y<1, 0≤z<1, and 0<t≤0.03, wherein the cathode active material satisfies the following formula (1): σ1/ t 1≤0.30 (1) where t1 is an element concentration average of insides and grain boundaries of primary particles of a W element, and σ1 is an element concentration standard deviation of the insides and grain boundaries of the primary particles of the W element, the element concentration being calculated by transmission electron microscope-energy dispersive x-ray spectroscopy analysis, and wherein an average particle diameter of the primary particles is in a range of from 0.1 to 2.0 μm. 2. The cathode active material according to claim 1 , wherein the cathode active material satisfies at least one of the following formulae (2) to (4): σ2/ t 2≤0.10 (2) σ3/ t 3≤0.10 (3) σ4/ t 4≤0.10 (4) where t2 is an element concentration average of insides and grain boundaries of primary particles of a Ni element; t3 is an element concentration average of insides and grain boundaries of primary particles of a Co element; t4 is an element concentration average of insides and grain boundaries of primary particles of a Mn element; σ2 is an element concentration standard deviation of the insides and grain boundaries of the primary particles of the Ni element; σ3 is an element concentration standard deviation of the insides and grain boundaries of the primary particles of the Co element; and σ4 is an element concentration standard deviation of the insides and grain boundaries of the primary particles of the Mn element. 3. The cathode active material according to claim 2 , wherein the cathode active material satisfies all of the following formulae (5) to (7): σ2/ t 2≤0.07 (5) σ3/ t 3≤0.07 (6) σ4/ t 4≤0.07 (7). 4. A lithium ion secondary battery comprising: a cathode comprising a cathode active material layer comprising the cathode active material defined by claim 1 , an anode comprising an anode active material layer comprising an anode active material, and an electrolyte layer disposed between the cathode and the anode.
Compounds containing nickel, with or without oxygen or hydrogen, and containing two or more other elements · CPC title
Energy storage using batteries · CPC title
of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title
of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title
Surface area · CPC title
Related publications grouped by family.
Answers are generated from the same data shown on this page.