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Novel sulfur-containing additive containing polymer long chain and application thereof

An additive and polymer technology, applied in the field of lithium-ion batteries, can solve the problems of poor molecular stability and poor ionic conductivity, and achieve the effects of strong stability, high ionic conductivity and prolonging battery life.

Active Publication Date: 2021-02-02
DONGYING HI TECH SPRING CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of poor molecular stability and poor ion conductivity in sulfur-containing additives in the prior art, the present invention proposes a polymer-containing substance with strong molecular stability, high ion conductivity, stable SEI film, and extended battery life. New long-chain sulfur-containing additives and their applications

Method used

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  • Novel sulfur-containing additive containing polymer long chain and application thereof
  • Novel sulfur-containing additive containing polymer long chain and application thereof
  • Novel sulfur-containing additive containing polymer long chain and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] This embodiment provides a novel sulfur-containing additive containing polymer long chains, and its structural formula is as follows:

[0055]

[0056] The preparation method of the novel sulfur-containing additive containing polymer long chain provided by this embodiment is:

[0057] Using azo compounds as initiators, introduce -SO at the end of PEG (CAS No.: 25322-68-3) by means of free radical substitution 3 Li is then grafted with 1,3 propane sultone (CAS No.: 1120-71-4) by solution precipitation polymerization to obtain a new type of sulfur-containing additive containing polymer long chains as shown in P1, which The synthesis reaction is:

[0058]

[0059] The present embodiment also provides a lithium-ion battery electrolyte and a lithium-ion battery prepared by utilizing a novel sulfur-containing additive containing a polymer long chain as shown in P1, and the method is specifically as follows:

[0060] (1) Mix ethylene carbonate: dimethyl carbonate: ethy...

Embodiment 2

[0063] This embodiment provides a novel sulfur-containing additive containing polymer long chains, and its structural formula is as follows:

[0064]

[0065] The preparation method of the novel sulfur-containing additive containing polymer long chain provided by this embodiment is:

[0066] Using an azo compound as an initiator, introduce -CH at the end of PEG (CAS No.: 25322-68-3) by means of free radical substitution 2 SO 3 Li is then grafted with 1,3 propane sultone (CAS No.: 1120-71-4) by solution precipitation polymerization to obtain a new type of sulfur-containing additive containing polymer long chains as shown in P2, which The synthesis reaction is:

[0067]

[0068] The present embodiment also provides a lithium-ion battery electrolyte and a lithium-ion battery prepared by utilizing a novel sulfur-containing additive containing polymer long chains as shown in P2, and the method is specifically as follows:

[0069] Add the above additives to the basic electr...

Embodiment 3

[0071] This embodiment provides a novel sulfur-containing additive containing polymer long chains, and its structural formula is as follows:

[0072]

[0073] The preparation method of the novel sulfur-containing additive containing polymer long chain provided by this embodiment is:

[0074] Using an azo compound as an initiator, introduce -CH at the end of polypropylene oxide (CAS No.: 25322-69-4) by means of common free radical substitution 2 SO 2 NNSO 2 CH 3 , and then use the method of solution precipitation polymerization to graft with 1,3 propane sultone (CAS No.: 1120-71-4) to obtain a new type of sulfur-containing additive containing polymer long chains as shown in P3, which is synthesized The response is:

[0075]

[0076] The present embodiment also provides a lithium-ion battery electrolyte and a lithium-ion battery prepared by utilizing a novel sulfur-containing additive containing polymer long chains as shown in P3, and the method is specifically as foll...

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Abstract

The invention provides a novel sulfur-containing additive containing a polymer long chain and an application thereof, and belongs to the field of lithium ion batteries. The novel sulfur-containing additive is a sulfur-containing compound which is based on 1, 3 propane sultone and contains a polymer long chain, and is obtained by introducing the polymer long chain with a certain molecular weight into the 1, 3 propane sultone in a chain grafting manner and grafting groups such as sulfonate radicals, lithium sulfonate and the like at the tail end of the polymer. The additive not only has strong self-stability of substance molecules and high ionic conductivity and can play a role in stabilizing an SEI film, but also can improve the lithium ion conductivity and further play a role in prolongingthe service life of a battery. Therefore, the novel sulfur-containing additive containing the polymer long chain has a very wide application prospect in the fields of lithium ion battery electrolytesand lithium ion batteries.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a novel sulfur-containing additive containing polymer long chains and an application thereof. Background technique [0002] At present, energy issues have become the main topic in today's world, and the development of new energy has gradually become popular. In this field, lithium-ion battery energy storage occupies a major position. As the core technology of electrolyte modification, electrolyte additive plays a vital role. Among them, sulfur-containing additives are a kind of film-forming additives that have been widely studied. Compared with traditional carbonate solvents, since S element has stronger electronegativity, it is easier to absorb electrons, making it more reducible on the surface of the negative electrode. [0003] For example, Chinese patent CN105175390A discloses a preparation method of 1-fluoro-1,3-propane sultone, which uses 1,3-propene sult...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525C08G65/334
CPCH01M10/0567H01M10/0525C08G65/3346Y02E60/10
Inventor 朱振涛贾国文赵新新魏志凯苗力孝张生安
Owner DONGYING HI TECH SPRING CHEM IND