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Lithium ion battery safety additive and preparation method and application thereof

A lithium-ion battery and additive technology, which is applied in the direction of battery, secondary battery, secondary battery repair/maintenance, etc., can solve the problems of affecting the electrochemical performance of the battery and unsatisfactory flame retardant effect, so as to improve safety and good resistance. burn effect

Active Publication Date: 2022-01-25
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the selection of phosphate, phosphite, and organic halogenated flame-retardant electrolytes is the main method to solve battery explosion and fire. Although the above-mentioned types of electrolyte additives can play a flame-retardant effect to a certain extent, they are The combustion effect is not ideal, and it will affect the electrochemical performance of the battery to a certain extent

Method used

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  • Lithium ion battery safety additive and preparation method and application thereof
  • Lithium ion battery safety additive and preparation method and application thereof
  • Lithium ion battery safety additive and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The specific synthesis steps of S11 and class A core-shell structure materials are as follows:

[0050] 1. Dissolve 10g caprolactone in 150mL toluene solution and disperse at room temperature for 60min to obtain solution A1;

[0051] 2. Disperse 6g of urea and 12g of phenolic resin in 150mL of toluene solution, and disperse at room temperature for 60min to obtain solution A2;

[0052] 3. Slowly add solution A1 to solution A2, stir evenly, add 0.1g benzoyl tert-butyl peroxide to polymerize caprolactone in situ, filter and use ethanol to remove impurities, and then place the solution in a fume hood After drying, the core-shell structure material of class A is obtained;

[0053] The specific synthesis steps of S12 and class B core-shell structure materials are as follows:

[0054] 1. Dissolve 6g caprolactone in 150mL toluene solution and disperse at room temperature for 60min to obtain solution B1;

[0055] 2. Dissolve 12g of phosphoric acid ester in 150mL of toluene so...

Embodiment 2

[0058] The specific synthesis steps of S21 and class A core-shell structure materials are as follows:

[0059] 1. Dissolve 5g caprolactone and 5g ethylene oxide in 150mL toluene solution, and disperse at room temperature for 60min to obtain solution A1;

[0060] 2. Disperse 6g of urea, 6g of ammonium polyphosphate, 3g of phenolic resin and 3g of pentaerythritol in 150mL of toluene solution, and disperse at room temperature for 60min to obtain solution A2;

[0061] 3. Slowly add solution A1 to solution A2, stir evenly, add 0.1g methyl ethyl ketone peroxide to polymerize caprolactone and ethylene oxide in situ, filter and use ethanol to remove impurities, and then place the solution in a fume hood After drying, the core-shell structure material of class A is obtained;

[0062] The specific synthesis steps of S22 and class B core-shell structure materials are as follows:

[0063] 1. Dissolve 3g caprolactone and 3g ethylene oxide in 150mL toluene solution, and disperse at room t...

Embodiment 3

[0067] The specific synthesis steps of S31 and class A core-shell structure materials are as follows:

[0068] 1. Dissolve 1g of ethylene oxide in 20mL of toluene solution and disperse at room temperature for 30min to obtain solution A1;

[0069] 2. Disperse 0.5g urea and 1g phenolic resin in 20mL toluene solution, and disperse at room temperature for 30min to obtain solution A2;

[0070] 3. Slowly add solution A1 to solution A2, stir evenly, add 0.01g ammonium persulfate to polymerize ethylene oxide in situ, filter and use ethanol to remove impurities, and then place the solution in a fume hood to dry to obtain Class A core-shell structure materials;

[0071] The specific synthesis steps of S32 and class B core-shell structure materials are as follows:

[0072] 1. Dissolve 1g of ethylene oxide in 20mL of toluene solution and disperse at room temperature for 30min to obtain solution B1;

[0073] 2. Dissolve 1g of phosphoric acid ester in 20mL of toluene solution and dispers...

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery safety additive and a preparation method and application thereof. The safety additive comprises an A-type core-shell structure material and a B-type core-shell structure material; each of the A-class core-shell structure material and the B-class core-shell structure material comprises a shell of a polymer with a melting point of 70-90 DEG C and a core body wrapped in the shell; the core body of the A-type core-shell structure material comprises a charring agent and a nitrogen-containing compound; the core body of the B-type core-shell structure material comprises a carbonization accelerator; and the mass ratio of the charring agent to the carbonization accelerator to the nitrogen-containing compound is 1: 1: (0.5-1). According to the lithium ion battery safety additive disclosed by the invention, on the premise of not influencing the electrochemical performance of the battery, a relatively good flame-retardant effect of the battery is realized, and the safety of the battery in a fault event is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a safety additive for lithium-ion batteries and its preparation method and application. Background technique [0002] Lithium-ion batteries include at least an anode, a cathode, and a separator separating the anode from the cathode, wherein the separator is impregnated with an electrolyte that primarily relies on the movement of lithium ions between the positive and negative electrodes to function. Lithium-ion batteries have the characteristics of long cycle life, high specific energy, and no memory effect. They are widely used in rechargeable batteries for portable electronic products such as mobile phones, laptops, and camcorders, as well as power sources for new energy vehicles. [0003] In recent years, with the promotion of new energy vehicles, the application of lithium-ion batteries in the new energy vehicle industry has increased. At the same time, the safet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/0525A62C3/16
CPCH01M10/4235H01M10/0525A62C3/16H01M2200/10Y02E60/10
Inventor 李伊阳屈国莹杨道均吴宁宁
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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