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Microcapsule, preparation method thereof, and lithium ion battery

A technology of lithium-ion batteries and microcapsules, which is applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc. It can solve the adverse effects of increasing the internal resistance of the isolation film, battery rate performance and low-temperature performance, and affecting lithium ion transmission. And other issues

Active Publication Date: 2019-03-12
SOUNDON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this approach will increase the internal resistance of the separator, affect the transmission of lithium ions, and adversely affect the rate performance and low-temperature performance of the battery.

Method used

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  • Microcapsule, preparation method thereof, and lithium ion battery
  • Microcapsule, preparation method thereof, and lithium ion battery
  • Microcapsule, preparation method thereof, and lithium ion battery

Examples

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preparation example Construction

[0039] The application also provides a method for preparing microcapsules, comprising the following steps:

[0040] A) mixing a polymer material, a flame retardant and an organic solvent to obtain an emulsion;

[0041] B) performing centrifugal spray drying on the emulsion in a centrifugal spray dryer to obtain microcapsules;

[0042] The flame retardant is selected from one or more of organic flame retardants and inorganic flame retardants;

[0043] The centrifugal spray dryer includes a centrifugal disc, a porous fence and a powder collector. The porous fence is arranged between the centrifugal disc and the powder collector. hole.

[0044] In the process of preparing microcapsules, the polymer material, flame retardant and organic solvent are first mixed to form an emulsion; in this process, the organic solvent is selected from acetone, ethanol, dimethyl carbonate, tetrahydrofuran and tetralin one or more. The solid content of the emulsion is 20wt%-75wt%, and in a specif...

Embodiment 1

[0067] 1) Preparation of microcapsules: Add ammonium polyphosphate or hexaphenoxycyclotriphosphazene powder particles into ethylene-vinyl acetate copolymer emulsion at a mass ratio of 4:6, and stir evenly in a disperser to obtain a solid content of 60 % to 65% of the emulsion, and finally the above-mentioned emulsion is centrifugally spray-dried to make ammonium polyphosphate and hexaphenoxycyclotriphosphazene as the capsule core and ethylene-vinyl acetate copolymer as the capsule shell with dual-core microcapsules (such as signal figure 1 as shown, figure 1 1 is the capsule shell part, 2 is the capsule core part, such as Figure 12 as shown, Figure 12 Electron micrograph of the microcapsule prepared for this embodiment);

[0068] 2) Preparation of safety paint: the microcapsules containing inorganic flame retardants and organic flame retardants prepared in the above steps are mixed with ceramic powder, acrylic emulsion, binder, surfactant and solvent according to the weig...

Embodiment 2

[0073] The difference from Example 1 is that the weight ratios of microcapsules, boehmite, acrylic emulsion, binder and surfactant in the safety coating are 55%, 42.1%, 1%, 1%, and 0.9%.

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Abstract

The invention provides a microcapsule, comprising a capsule shell portion and a capsule core portion that is selected from one or both of an organic flame retardant and an inorganic flame retardant, wherein the outer surface of the capsule shell portion has a pile structure, and the capsule shell portion is made of polymer material. The application also provides a method of preparing the microcapsule, and a lithium ion battery. The microcapsule provided by the application is applied to the lithium ion battery, which can improve the safety of the lithium ion battery without affecting the electrochemical performance of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a microcapsule, a preparation method thereof and a lithium ion battery. Background technique [0002] In recent years, with the rapid development of portable electronic products, electric vehicles, and energy storage power stations, lithium-ion batteries have become the preferred chemical power sources due to their high energy density, high operating voltage, small self-discharge, and long cycle life. With the upgrading of products, people have higher and higher requirements for the energy density of lithium-ion batteries, but the safety performance has not been upgraded simultaneously. In actual use, safety accidents occur from time to time, mainly because lithium-ion batteries are exposed to high During the process of falling, shrinkage and embrittlement of the diaphragm, the contact short circuit of the cathode and the anode will cause thermal runaway, which will...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/42H01M10/0525A62C37/11
CPCA62C37/11H01M4/62H01M4/627H01M10/0525H01M10/4235Y02E60/10
Inventor 李景夫林珍艳易四勇林洋
Owner SOUNDON NEW ENERGY TECH CO LTD
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