Surface coated positive electrode active material, preparation method thereof and lithium secondary battery including the same
US-2017170481-A1 · Jun 15, 2017 · US
Cathode having improved safety and lithium secondary battery including the same
US10903497B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10903497-B2 |
| Application number | US-201716086339-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 31, 2017 |
| Priority date | Mar 31, 2016 |
| Publication date | Jan 26, 2021 |
| Grant date | Jan 26, 2021 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
The present disclosure relates to a cathode including a cathode active material and poly(amic acid). When the lithium secondary battery including the cathode is in an abnormal operation range of 160° C. or higher, condensation reaction of poly(amic acid) occurs to form polyimide. The polyimide surrounds cathode active material particles in the form of a coating film and prevents transport of lithium ions and electrons to interrupt current flow, and inhibits abnormal heat emission and thermal runaway or combustion caused by additional reactions.
First claim
Opening claim text (preview).
What is claimed is: 1. A cathode comprising a cathode active material and poly(amic acid) represented by the following Chemical Formula 1a: wherein R independently represents a C1-C12 alkenyl or C6-C12 aromatic ring, and a carbon atom or hydrogen atom of the alkenyl or aromatic ring is non-substituted or substituted with an oxygen, sulfur or halogen atom depending on atomic valences; and A independently represents a bond, C1-C12 alkenyl or C6-C12 aromatic ring, and a carbon atom or hydrogen atom of the alkenyl or aromatic ring is non-substituted or is substituted with an oxygen, sulfur or halogen atom depending on atomic valences, wherein the poly(amic acid) is included in an amount of 1 part to 5 parts by weight based on 100 parts by weight of the cathode active material. 2. The cathode according to claim 1 , wherein the poly(amic acid) is converted into polyimide at a temperature of 160° C. or higher. 3. The cathode according to claim 1 , wherein the poly(amic acid) is represented by the following Chemical Formula 2a: 4. The cathode according to claim 1 , wherein, as a binder polymer, only the poly(amic acid) represented by the above Chemical Formula 1a is comprised. 5. The cathode according to claim 1 , wherein the poly(amic acid) has a molecular weight of 5,000-200,000. 6. The cathode according to claim 1 , which further comprises microcapsules comprising: a shell having a glass transition temperature or melting point at 160° C.; and pyridine and diacetic anhydride present inside of the shell. 7. A lithium secondary battery comprising the cathode of claim 1 .
Assignees
Inventors
Classifications
Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title
- H01M4/13Primary
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title
as layered products · CPC title
Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title
- H01M4/622Primary
being polymers · CPC title
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Frequently asked questions
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- What does patent US10903497B2 cover?
- The present disclosure relates to a cathode including a cathode active material and poly(amic acid). When the lithium secondary battery including the cathode is in an abnormal operation range of 160° C. or higher, condensation reaction of poly(amic acid) occurs to form polyimide. The polyimide surrounds cathode active material particles in the form of a coating film and prevents transport of li…
- Who is the assignee on this patent?
- Lg Chemical Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01M4/13. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jan 26 2021 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 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).