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Sulfur-containing additives and their applications

An additive and long-chain technology, applied in the field of lithium-ion batteries, can solve the problems of poor ion conductivity and poor molecular stability, and achieve the effect of high ion conductivity, strong stability, and easy absorption of electrons

Active Publication Date: 2021-12-14
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 the sulfur-containing additives in the prior art, the present invention proposes a sulfur-containing additive with strong molecular stability, high ion conductivity, stable SEI film, and extended battery life and its application

Method used

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  • Sulfur-containing additives and their applications
  • Sulfur-containing additives and their applications
  • Sulfur-containing additives and their applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] This embodiment provides a sulfur-containing additive whose structural formula is as follows:

[0060]

[0061] The preparation method of the sulfur-containing additive provided in this example is: using an azo compound as an initiator, introducing -SO at the end of PEG (CAS No.: 25322-68-3) by means of common free radical substitution 3 Li is then grafted with vinyl sulfite (CAS number: 3741-38-6) by solution precipitation polymerization to obtain the sulfur-containing additive shown in P1, and its synthesis reaction is:

[0062]

[0063] This embodiment also provides a lithium-ion battery electrolyte prepared by using a sulfur-containing additive as shown in P1, and the method is specifically as follows:

[0064] (1) Mix ethylene carbonate: dimethyl carbonate: ethyl methyl carbonate in a ratio of 3:4:3 to obtain a mixed solution, then add a certain mass of lithium hexafluorophosphate to the mixed solution and continue stirring until uniformly prepared 0.9mol / L...

Embodiment 2

[0067] This embodiment provides a sulfur-containing additive whose structural formula is as follows:

[0068]

[0069] The preparation method of the sulfur-containing additive provided in this example is: using an azo compound as an initiator, introducing -CH at the end of PEG (CAS No.: 25322-68-3) by means of common free radical substitution 2 SO 3 Li is then grafted with vinyl sulfite (CAS No.: 3741-38-6) by solution precipitation polymerization to obtain a sulfur-containing additive as shown in P2, and its synthesis reaction is:

[0070]

[0071] This embodiment also provides a lithium-ion battery electrolyte prepared by using a sulfur-containing additive as shown in P2, and the method is specifically as follows:

[0072] Add the sulfur-containing additive shown in P2 to the basic electrolyte of EC:EMC:DEC, the addition amount is 2.5%, and make a ternary NCM523 button half-cell. Discharge at 0.5C constant current to 2.5V at 25°C, Stand still for 1min, charge with 0....

Embodiment 3

[0074] This embodiment provides a sulfur-containing additive whose structural formula is as follows:

[0075]

[0076] The preparation method of the sulfur-containing additive provided in this example is: using an azo compound as an initiator, introducing —CH 2 SO 2 NNSO 2 CH 3 , and then use the method of solution precipitation polymerization to graft with vinyl sulfite (CAS number: 3741-38-6) to obtain the sulfur-containing additive shown in P3, and its synthesis reaction is:

[0077]

[0078] This embodiment also provides a lithium-ion battery electrolyte prepared by using a sulfur-containing additive as shown in Formula 4, and the method is specifically as follows:

[0079] (1) Mix ethylene carbonate: dimethyl carbonate: ethyl methyl carbonate in a ratio of 3:4:3 to obtain a mixed solution, then add a certain mass of lithium hexafluorophosphate to the mixed solution and continue stirring until uniformly prepared 0.9mol / L solution;

[0080] (2) Then add 1.5% sul...

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Abstract

The invention provides a novel sulfur-containing additive and application thereof, belonging to the field of lithium ion batteries. The novel sulfur-containing additive is a sulfur-containing compound containing a long polymer chain. The long polymer chain with a certain molecular weight is introduced into vinyl sulfite in the form of a graft chain, and sulfonate, sulfonate and sulfonate are grafted at the end of the polymer. obtained from groups such as lithium sulfonate. Such additives not only have strong molecular stability and high ionic conductivity, which can stabilize the SEI film, but also improve the lithium ion conductivity, thereby prolonging battery life. Therefore, this new type of sulfur-containing additive has a very broad application prospect in the field of lithium-ion battery electrolyte and lithium-ion battery.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a sulfur-containing additive and its application. 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 CN106749165A discloses a method for preparing butenyl sulfite, which is to prepare a sulfur-containing additive by reacting dialkyl sulfite with butanediol. Al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525C08G65/334
CPCH01M10/0567H01M10/0525C08G65/3344Y02E60/10
Inventor 朱振涛贾国文赵新新魏志凯苗力孝张生安杨献峰
Owner DONGYING HI TECH SPRING CHEM IND