A lithium-replenishing sustained-release capsule, its electrolyte, and a lithium-ion battery

A slow-release capsule and electrolyte technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, electrolytes, etc., can solve the problems of battery performance damage, lower conduction efficiency, etc., and achieve improved service life, improved cycle performance, and stable thermal processing sex enhancing effect

Active Publication Date: 2021-12-03
HAIKE GRP RES INST OF INNOVATION & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A lithium-replenishing sustained-release capsule, its electrolyte, and a lithium-ion battery
  • A lithium-replenishing sustained-release capsule, its electrolyte, and a lithium-ion battery

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preparation example Construction

[0027] The present invention provides a preparation method of the lithium supplement sustained-release capsule described in the above scheme, comprising the following steps:

[0028]1) Mix amino resin monomer, formaldehyde, gelatin and water, adjust the pH value of the obtained mixture to 6.0-8.5, heat to 40-70°C and keep it warm 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 in the step 1), heat up to 40-60°C, adjust the pH value to 3-5, and prepare the obtained mixed solution after pH adjustment Stirring and standing still, the gelatin-modified amino resin prepolymer solution is coated on the surface of the lithium salt solution to obtain the first layer of coated capsules;

[0030] 3) Mix the acrylate monomer, initiator, and cross-linking agent with the first-layer-coated capsule in step 2), raise the temperature to 60-80° C. and react for ...

Embodiment 1

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

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

Embodiment 2

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

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

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Abstract

The invention discloses a lithium supplement slow-release capsule, its electrolyte and a lithium ion battery, belonging to the technical field of lithium ion battery electrolyte. The lithium-supplementing sustained-release capsule includes a capsule core, a first capsule wall and a second capsule wall; the capsule core is a novel lithium salt solution; the novel lithium salt solution is lithium difluorophosphate solution, lithium difluorosulfonimide One or two of solution, lithium dioxalate borate solution and lithium bistrifluoromethane xanthimide solution; the first capsule wall is made of gelatin modified amino resin composite material; the second capsule wall is made of acrylate polymer. The lithium-supplementing sustained-release capsule provided by the invention can gradually release the internal core fluid during the use of the battery, reduce some side effects of the additive in the battery system, and allow the additive to act in the lithium-ion battery system for a long time. At the same time, it can also supplement the loss of lithium ions and further improve the cycle life of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrolyte, and in particular relates to a lithium-supplementing slow-release capsule, its electrolyte, 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 wide application of lithium-ion batteries, the requirements for battery charging rate, battery life and safety performance are getting higher and higher. [0003] Currently, widely used electrolytes in lithium-ion batteries include the conductive lithium salt lithium hexafluorophosphate and traditional additives. However, there are many deficiencies in the above-mentioned electrolyte, especially in terms of long-term cycle performance, which is often not good, which is also the reason that directly leads to the decre...

Claims

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Application Information

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Patent Type & Authority Patents(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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