Composite separator, method of preparing the same, and lithium secondary battery including the same
US-2019326579-A1 · Oct 24, 2019 · US
Fluorinated ionic liquids for multi-layer Li ion battery applications
US11258102B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11258102-B2 |
| Application number | US-201916416114-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 17, 2019 |
| Priority date | May 17, 2019 |
| Publication date | Feb 22, 2022 |
| Grant date | Feb 22, 2022 |
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Abstract
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Fluorinated ionic liquids have been prepared to be used as catholytes in lithium battery cells. Such ionic liquids are immiscible with polyethylene-oxide-based solid polymer electrolytes, which may be used as separators in such cells. Such catholytes can increase the lifetime and boost the performance of lithium battery cells.
First claim
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We claim: 1. An electrochemical cell, comprising: a negative electrode configured to absorb and release alkali metal ions; a positive electrode comprising a positive electrode active material, a binder, a fluorinated ionic liquid catholyte, a first salt comprising an alkali metal, and, optionally, electronically conducting carbon; a separator layer comprising a block copolymer electrolyte and a second salt comprising the alkali metal, the separator layer disposed between the negative electrode and the positive electrode and facilitates ionic communication therebetween; and wherein the fluorinated ionic liquid catholyte is immiscible with the block copolymer electrolyte; and wherein the fluorinated ionic liquid catholyte is wherein X is TFSI; R is hydrogen; Rf is (CF2) a CF 3 , in which a is 7; and n is 2. 2. The electrochemical cell of claim 1 wherein a first block of the block copolymer electrolyte is ionically conductive and is a polyether. 3. The electrochemical cell of claim 2 wherein a second block of the block copolymer electrolyte is polystyrene. 4. The electrochemical cell of claim 1 wherein the alkali metal comprises lithium and the first salt and the second salt are each selected independently from the group consisting of LiTFSI, LiFSI, LiPF 6 , LiFAP, LiBF 4 , LiClO 4 , LiOTf, LiC(Tf) 3 , LiBOB, and LiDFOB. 5. The electrochemical cell of claim 4 wherein the first salt and the second salt are the same. 6. The electrochemical cell of claim 1 wherein the negative electrode is a lithium-containing metal foil, and the first salt and the second salt are both lithium salts.
Assignees
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Classifications
Ionic conductivity · CPC title
Polyolefins · CPC title
Li-accumulators · CPC title
- H01M10/0569Primary
characterised by the solvents · CPC title
Immobilising or gelification of electrolyte · CPC title
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Frequently asked questions
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- What does patent US11258102B2 cover?
- Fluorinated ionic liquids have been prepared to be used as catholytes in lithium battery cells. Such ionic liquids are immiscible with polyethylene-oxide-based solid polymer electrolytes, which may be used as separators in such cells. Such catholytes can increase the lifetime and boost the performance of lithium battery cells.
- Who is the assignee on this patent?
- Bosch Gmbh Robert
- What technology area does this patent fall under?
- Primary CPC classification H01M10/0569. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Feb 22 2022 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 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).