Positive electrode active material for secondary batteries and lithium ion secondary battery using the same
US-2016344027-A1 · Nov 24, 2016 · US
Positive electrode active material for secondary batteries and lithium ion secondary battery using the same
US9711792B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9711792-B2 |
| Application number | US-201415112752-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 10, 2014 |
| Priority date | Mar 10, 2014 |
| Publication date | Jul 18, 2017 |
| Grant date | Jul 18, 2017 |
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Abstract
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Provided is a positive electrode active material for lithium ion secondary batteries, having a crystal structure containing a layered Li 2 MnO 2 structure with a high theoretical electrical capacity as a basic skeleton, and having both a high theoretical electrical capacity and a high open-circuit voltage by increasing an open-circuit voltage to a value of more than 2 V by replacing a part of manganese ions with calcium ions by adding the calcium ions. That is, a positive electrode active material for secondary batteries mainly containing a compound represented by a chemical composition formula Li 2−x Mn 1−y Ca y O 2 , and an electrode and a battery including the same are realized. In the formula, x satisfies 0<x<1.3, and y satisfies 0.2<y<0.9.
First claim
Opening claim text (preview).
The invention claimed is: 1. A positive electrode active material for secondary batteries comprising a compound represented by a chemical formula Li 2−x Mn 1−y Ca y O 2 , having a layered crystal structure, and satisfying 0.0<x<1.3 and 0.2<y<0.9, wherein the compound has a trigonal crystal structure belonging to a space group P-3m1. 2. The positive electrode active material for secondary batteries according to claim 1 , wherein y is 0.5. 3. A positive electrode active material for secondary batteries, wherein a surface of the positive electrode active material is covered with a compound represented by a chemical formula Li 2−x Mn 1−y Ca y O 2 , having a layered crystal structure, and satisfying 0.0<x<1.3 and 0.2<y<0.9, wherein the compound has a trigonal crystal structure belonging to a space group P-3m1.
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Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title
Li-accumulators · CPC title
Electric properties · CPC title
by unit-cell parameters, atom positions or structure diagrams · CPC title
Positive electrodes · CPC title
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- What does patent US9711792B2 cover?
- Provided is a positive electrode active material for lithium ion secondary batteries, having a crystal structure containing a layered Li 2 MnO 2 structure with a high theoretical electrical capacity as a basic skeleton, and having both a high theoretical electrical capacity and a high open-circuit voltage by increasing an open-circuit voltage to a value of more than 2 V by replacing a part of …
- Who is the assignee on this patent?
- Hitachi Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01M4/505. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jul 18 2017 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 7 related publications on this page (citations in our corpus or others sharing the same primary CPC).