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Cyclic sulfate additive containing silicon-oxygen chain segment, electrolyte containing cyclic sulfate additive and lithium ion battery

A lithium-ion battery, electrolyte technology, applied in secondary batteries, silicon organic compounds, secondary battery repair/maintenance, etc. It can improve the high and low temperature cycle performance, improve the cycle performance, and stabilize the overall performance of the battery.

Active Publication Date: 2020-12-08
DONGYING HI TECH SPRING CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example: patent CN109935907A proposes a silicon-based sulfate ester, which can improve the storage stability of the battery at room temperature. However, it cannot take into account the high-temperature cycle performance, making it difficult to use the electrolyte when the temperature is high.
In addition, a large number of patents are devoted to improving the capacity performance of the battery. Although the capacity of the battery can be further stimulated, but only focusing on the capacity density and not on the improvement of the battery cycle performance, the life of the battery cannot be guaranteed. big waste

Method used

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  • Cyclic sulfate additive containing silicon-oxygen chain segment, electrolyte containing cyclic sulfate additive and lithium ion battery
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  • Cyclic sulfate additive containing silicon-oxygen chain segment, electrolyte containing cyclic sulfate additive and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A kind of cyclic sulfuric acid ester additive containing silicon oxygen segment, its structural formula is as follows:

[0041]

[0042] Among them, n=2, R 1 and R 2 The groups are all methyl groups.

[0043] The preparation method of the above-mentioned cyclic sulfuric acid ester additive containing siloxane segment is: take 1mol tetramethyldivinyldisiloxane (CAS: 2627-95-4) and 2mol methanesulfonic acid (CAS: 75-75 -2) Carry out addition reaction, the reaction temperature is 50°C, and the reaction time is 6h; add 500ml, 1mol / L sulfuric acid solution for acidification treatment to obtain disiloxane containing sulfuric acid groups; Add 100ml concentrated sulfuric acid to disiloxane for dehydration and cyclization reaction to obtain cyclic silyl sulfonate lactone; take 0.5mol octamethylcyclotetrasiloxane (CAS: 556-67-2), add 0.05mol hydroxide Lithium was used as an initiator, 200ml DMF was added as an accelerator, and the ring-opening polymerization was carried out...

Embodiment 2

[0047] The difference between this embodiment and Example 1 is: in the structural formula of the cyclic sulfate additive containing silicon oxygen segment provided in this embodiment, n=5; the cyclic sulfate additive containing silicon oxygen segment In the preparation method, the addition amount of octamethylcyclotetrasiloxane is 1.25mol.

Embodiment 3

[0049] The difference between this embodiment and Example 1 is: in the structural formula of the cyclic sulfate additive containing silicon oxygen segment provided in this embodiment, n=8; the cyclic sulfate additive containing silicon oxygen segment In the preparation method, the addition amount of octamethylcyclotetrasiloxane is 2 mol.

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Abstract

The invention provides a cyclic sulfate additive containing a silicon-oxygen chain segment, an electrolyte containing the cyclic sulfate additive and a lithium ion battery, and belongs to the technical field of lithium ion batteries, and the additive can improve the high and low temperature performance of the lithium ion battery at the same time by introducing a silicon-oxygen long-chain segment stable SEI film. The middle part of a molecular chain of the additive is a silicon-oxygen long-chain segment, and two ends of the molecular chain are cyclic sulphate.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a cyclic sulfuric acid ester additive containing silicon-oxygen chain segments, an electrolyte containing the same, and a lithium-ion battery. Background technique [0002] Lithium-ion batteries are widely used in consumer electronics products, energy storage and power batteries due to their advantages such as high specific energy, long cycle life, and small self-discharge. With the widespread application of lithium-ion batteries, their use environments have long tended to be diverse. At the same time, the requirements for battery charging rate, battery life and safety performance are also getting higher and higher. For example, frequent charging and discharging of the battery requires improving the cycle performance of the battery; in areas with high temperature or hot summer, this requires the battery to have good high and low temperature performance. ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42C07F7/08
CPCC07F7/087H01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 贾国文魏志凯朱振涛苗力孝吴雷雷燕增伟林海张生安
Owner DONGYING HI TECH SPRING CHEM IND