Positive electrode active material for lithium secondary battery
US-10186706-B2 · Jan 22, 2019 · US
Cathode active material for all-solid-state lithium secondary battery
US10763499B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10763499-B2 |
| Application number | US-201716317043-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 12, 2017 |
| Priority date | Jul 14, 2016 |
| Publication date | Sep 1, 2020 |
| Grant date | Sep 1, 2020 |
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Abstract
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Provided is a novel positive electrode active material capable of suppressing resistance and improving rate characteristics and cycle characteristics while enhancing lithium ionic conductivity, wherein the surface of particles composed of a spinel-type composite oxide containing Li, Mn, O, and two or more other elements is coated with a lithium ion conductive oxide such as LiNbO3. Proposed is a positive electrode active material for an all-solid-type lithium secondary battery, wherein the surface of present core particles composed of a spinel-type composite oxide containing Li, Mn, O, and two or more other elements is coated with an amorphous compound containing Li, A (A represents one or more elements selected from the group consisting of Ti, Zr, Ta, Nb, and Al), and O; and the molar ratio (Li/A) of Li relative to the A element in the surface, as obtained by XPS, is 1.0 to 3.5.
First claim
Opening claim text (preview).
The invention claimed is: 1. A positive electrode active material for an all-solid-type lithium secondary battery to be used for an all-solid-type lithium secondary battery, wherein the surface of particles (referred to as “core particles”) composed of a spinel-type composite oxide containing Li, Mn, O, and two or more other elements is coated with an amorphous compound containing Li, A (A represents one or more elements selected from the group consisting of Ti, Zr, Ta, Nb, and Al), and O; and the molar ratio (Li/A) of Li relative to the A element in the surface, as obtained by X-ray photoelectron spectroscopy (XPS), is 1.0 to 3.5. 2. The positive electrode active material for an all-solid-type lithium secondary battery according to claim 1 , wherein, in the amorphous compound, a halo pattern can be obtained by selected area electron diffraction. 3. The positive electrode active material for an all-solid-type lithium secondary battery according to claim 2 , wherein an amount of lithium carbonate present on the surface of the positive electrode active material is less than 2.5 wt % relative to the amount of the positive electrode active material. 4. The positive electrode active material for an all-solid-type lithium secondary battery according to claim 3 , wherein the spinel-type composite oxide constituting the core particles is represented by a general formula: Li[Li a Mn 2-a-b-c M1 b M2 c ]O 4-δ (where M1 represents one or more elements selected from the group consisting of Ni, Co, and Fe; M2 represents one or more elements selected from the group consisting of Mg, Ti, Al, Ba, Cr, W, Mo, Y, Zr, and Nb; and the parameters a, b, and c satisfy 0.00≤a≤0.20, 0.20≤b≤1.20, and 0.001≤c≤0.400 respectively). 5. An all-solid-type lithium secondary battery comprising the positive electrode active material for an all-solid-type lithium secondary battery according claim 3 . 6. The positive electrode active material for an all-solid-type lithium secondary battery according to claim 2 , wherein the spinel-type composite oxide constituting the core particles is represented by a general formula: Li[Li a Mn 2-a-b-c M1 b M2 c ]O 4-δ (where M1 represents one or more elements selected from the group consisting of Ni, Co, and Fe; M2 represents one or more elements selected from the group consisting of Mg, Ti, Al, Ba, Cr, W, Mo, Y, Zr, and Nb; and the parameters a, b, and c satisfy 0.00≤a≤0.20, 0.20≤b≤1.20, and 0.001≤c≤0.400 respectively). 7. An all-solid-type lithium secondary battery comprising the positive electrode active material for an all-solid-type lithium secondary battery according claim 2 . 8. The positive electrode active material for an all-solid-type lithium secondary battery according to claim 1 , wherein an amount of lithium carbonate present on the surface of the positive electrode active material is less than 2.5 wt % relative to the amount of the positive electrode active material. 9. The positive electrode active material for an all-solid-type lithium secondary battery according to claim 8 , wherein the spinel-type composite oxide constituting the core particles is represented by a general formula: Li[Li a Mn 2-a-b-c M1 b M2 c ]O 4-δ (where M1 represents one or more elements selected from the group consisting of Ni, Co, and Fe; M2 represents one or more elements selected from the group consisting of Mg, Ti, Al, Ba, Cr, W, Mo, Y, Zr, and Nb; and the parameters a, b, and c satisfy 0.00≤a≤0.20, 0.20≤b≤1.20, and 0.001≤c≤0.400 respectively). 10. An all-solid-type lithium secondary battery comprising the positive electrode active material for an all-solid-type lithium secondary battery according claim 8 . 11. The positive electrode active material for an all-solid-type lithium secondary battery according to claim 1 , wherein the spinel-type composite oxide constituting the core particles is represented by a general formula: Li[Li a Mn 2-a-b-c M1 b M2 c ]O 4-δ (where M1 represents one or more elements selected from the group consisting of Ni, Co, and Fe; M2 represents one or more elements selected from the group consisting of Mg, Ti, Al, Ba, Cr, W, Mo, Y, Zr, and Nb; and the parameters a, b, and c satisfy 0.00≤a≤0.20, 0.20≤b≤1.20, and 0.001≤c≤0.400 respectively). 12. An all-solid-type lithium secondary battery comprising the positive electrode active material for an all-solid-type lithium secondary battery according claim 11 . 13. An all-solid-type lithium secondary battery comprising the positive electrode active material for an all-solid-type lithium secondary battery according claim 1 .
Assignees
Inventors
Classifications
Solid materials · CPC title
- H01M4/366Primary
as layered products · CPC title
Energy storage using batteries · CPC title
of the type (Mn2O4)-, e.g. Li(NixMn2-x)O4 or Li(MyNixMn2-x-y)O4 · CPC title
Li-accumulators · CPC title
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- What does patent US10763499B2 cover?
- Provided is a novel positive electrode active material capable of suppressing resistance and improving rate characteristics and cycle characteristics while enhancing lithium ionic conductivity, wherein the surface of particles composed of a spinel-type composite oxide containing Li, Mn, O, and two or more other elements is coated with a lithium ion conductive oxide such as LiNbO3. Proposed is a…
- Who is the assignee on this patent?
- Mitsui Mining & Smelting Co
- What technology area does this patent fall under?
- Primary CPC classification H01M4/366. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Sep 01 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).