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Lithium supplementing sustained-release capsule, electrolyte thereof and lithium ion battery

A technology for slow-release capsules and electrolytes, applied in non-aqueous electrolyte batteries, electrolyte battery manufacturing, electrolytes, etc., can solve problems such as reducing conduction efficiency and battery performance damage, improving cycle performance, improving service life, and improving compactness. Effect

Active Publication Date: 2021-02-12
HAIKE GRP RES INST OF INNOVATION & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the new lithium salt additives will also cause some negative reactions while improving the performance of lithium-ion batteries. For example, due to the film-forming characteristics of lithium difluorophosphate, when lithium difluorophosphate is added too much, it will form on the surface of the electrode. A thicker deposited SEI film, although the SEI film itself will protect the electrode from being damaged, but because lithium ions pass through the thicker SEI film will reduce the conduction efficiency, which will damage the performance of the battery, so the amount added is limited , and the limited new lithium salt will be continuously consumed during the long-term cycle

Method used

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  • Lithium supplementing sustained-release capsule, electrolyte thereof and lithium ion battery
  • Lithium supplementing sustained-release capsule, electrolyte thereof and lithium ion battery

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preparation example Construction

[0027]The present invention provides a method of preparing a bonded lithium sustained release capsule according to the above scheme, including the following steps:

[0028]1) Mix the amino resin monomer, formaldehyde, gelatin and water, adjust the pH of the obtained mixture to 6.0-8.5, heat it to 40-70°C and keep it for 20-60 minutes to obtain gelatin modified amino resin prepolymer Solution

[0029]2) Mix the new lithium salt solution with the gelatin-modified amino resin prepolymer solution of step 1), raise the temperature to 40-60°C, adjust the pH value to 3-5, and sequentially add the resulting pH-adjusted mixture After stirring and standing, the gelatin-modified amino resin prepolymer solution is coated on the surface of the lithium salt solution to obtain a first-layer coated capsule;

[0030]3) Mix the acrylate monomer, initiator, and crosslinking agent with the first-layer coated capsule of step 2), and raise the temperature to 60-80° C. to react for 2-5 hours to obtain a lithium-su...

Embodiment 1

[0043]Add 0.36g of gelatin, 3.6g of melamine, 4.0g of 37% formaldehyde and 25g of water into a 250mL three-necked flask, adjust the pH to 8.5 with sodium hydroxide solution, and then heat to 70℃, the reaction solution is clarified and kept warm After reacting for 20 minutes, the gelatin modified resin prepolymer solution was prepared, which was cooled to room temperature for later use.

[0044]Use ethylene glycol dimethyl ether to prepare lithium difluorophosphate into a lithium difluorophosphate solution with a mass concentration of 30%, then add it to a 100mL three-necked flask equipped with a thermometer, agitator and reflux condenser, and add the gelatin prepared above Modified resin prepolymer solution (the mass of melamine used to prepare the gelatin modified resin prepolymer solution is 20% of the mass of the lithium difluorophosphate solution), add hydrochloric acid at 50°C, adjust the pH to 3.5, and use 100r / min Stir for 3h at the rotating speed of, and let stand for 1h. The g...

Embodiment 2

[0047]Add 0.57g of gelatin, 3.6g of urea, 0.54g of 37% formaldehyde and 25g of water into a 250mL three-necked flask, adjust the pH to 6.0 with sodium hydroxide solution, then heat to 40℃, and keep the reaction solution clarified. After reacting for 60 minutes, the gelatin modified resin prepolymer solution was prepared, and it was cooled to room temperature for later use.

[0048]Use ethylene glycol dimethyl ether to prepare lithium bisfluorosulfonimide into a solution of lithium bisfluorosulfonimide with a mass concentration of 30%, and then add it to a 100mL three-necked flask equipped with a thermometer, agitator and reflux condenser. Add the gelatin modified resin prepolymer solution prepared above (the mass of urea used to prepare the gelatin modified resin prepolymer solution is 70% of the mass of the lithium difluorophosphate solution), add hydrochloric acid at 40°C, and adjust the pH to 5. Stir at a speed of 200r / min for 2.5h and let it stand for 1h. The gelatin modified resin...

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Abstract

The invention discloses a lithium supplementing sustained-release capsule, an electrolyte thereof and a lithium ion battery, and belongs to the technical field of lithium ion battery electrolytes. Thelithium supplementing sustained-release capsule comprises a capsule core, a first-layer capsule wall and a second-layer capsule wall, wherein the capsule core is a novel lithium salt solution; the novel lithium salt solution is one or two of a lithium difluorophosphate solution, a lithium bis (fluorosulfonyl) imide solution, a lithium bis (oxalato) borate solution and a lithium bis (trifluoromethanesulfonyl) imide solution; the first capsule wall layer is made of a gelatin modified amino resin composite material; and the second capsule wall is an acrylate polymer. The lithium supplementing sustained-release capsule provided by the invention can gradually release internal core liquid in the use process of a battery, so partial side effects of an additive in a battery system are reduced, and the additive can act in the lithium ion battery system for a long time. Meanwhile, lithium ion loss can be supplemented, and the cycle service life of the battery is further prolonged.

Description

Technical field[0001]The present invention belongs to the technical field of lithium ion battery electrolyte, and more particularly to a lithium-sustained release capsule and its electrolyte and a lithium ion battery.Background technique[0002]Lithium-ion batteries have been widely used in consumer electronics and energy storage and power cells due to high comparative energy, long cycle life, and self-discharge. With the wide application of lithium-ion batteries, the charging magnification, battery life and safety requirements of the battery are also increasing.[0003]Currently, electrolytes widely used in lithium ion batteries include lithium-conductive lithium salt hexafluorophosphate and conventional additives. However, the above electrolyte has many shortcomings, especially in terms of long-term cycle, which also directly leads to a decline in the life of the battery. Since the lithium-ion batteries during use, requiring frequent charge and discharge, in the long term charge and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/058H01M2300/0094Y02E60/10Y02P70/50
Inventor 贾国文马俊青苗力孝朱振涛刘磊赵新新
Owner HAIKE GRP RES INST OF INNOVATION & TECH
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