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Novel Sulfur-Containing Additives Containing Long Polymer Chains and Their Applications

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

Active Publication Date: 2022-05-17
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 Additives Containing Long Polymer Chains and Their Applications
  • Novel Sulfur-Containing Additives Containing Long Polymer Chains and Their Applications
  • Novel Sulfur-Containing Additives Containing Long Polymer Chains and Their Applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This embodiment provides a novel sulfur-containing additive containing polymer long chains, and its structural formula is as follows:

[0053]

[0054] The preparation method of the novel sulfur-containing additive containing polymer long chain provided by this embodiment is:

[0055] 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:

[0056]

[0057] This embodiment also provides a lithium-ion battery electrolyte and a lithium-ion battery prepared by using a novel sulfur-containing additive containing a polymer long chain as shown in P1, and the method is specifically as follows:

[0058] (1) Mix ethylene carbonate: dimethyl carbonate: ethyl methyl ca...

Embodiment 2

[0061] This embodiment provides a novel sulfur-containing additive containing polymer long chains, and its structural formula is as follows:

[0062]

[0063] The preparation method of the novel sulfur-containing additive containing polymer long chain provided by this embodiment is:

[0064] 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:

[0065]

[0066] This embodiment also provides a lithium-ion battery electrolyte and a lithium-ion battery prepared by using a novel sulfur-containing additive containing a polymer long chain as shown in P2, and the method is specifically as follows:

[0067] Add the above additives to the basic electrolyte of E...

Embodiment 3

[0069] This embodiment provides a novel sulfur-containing additive containing polymer long chains, and its structural formula is as follows:

[0070]

[0071] The preparation method of the novel sulfur-containing additive containing polymer long chain provided by this embodiment is:

[0072] 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:

[0073]

[0074] This embodiment also provides a lithium-ion battery electrolyte and a lithium-ion battery prepared by using a novel sulfur-containing additive containing polymer long chains as shown in P3, and the method is specifically as follows:

[00...

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Abstract

The invention proposes a novel sulfur-containing additive containing polymer long chains and its application, belonging to the field of lithium ion batteries. The new sulfur-containing additive is a sulfur-containing compound containing long polymer chains based on 1,3 propane sultone, which is introduced into 1,3 propane sultone by grafting a long polymer chain of a certain molecular weight and obtained by grafting sulfonate, lithium sulfonate and other groups at the end of the polymer. This type of additive not only has strong molecular stability and high ion conductivity, but also can stabilize the SEI film, and can improve the lithium ion conductivity, thereby prolonging the battery life. Therefore, such novel sulfur-containing additives containing long polymer chains have very broad application prospects in the fields of lithium-ion battery electrolytes and 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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Patent Type & Authority Patents(China)
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