Lithium ion diaphragm containing lithium carbonate coating and preparation method of lithium ion diaphragm

A technology of lithium carbonate and lithium ions, which is applied in the lithium ion diaphragm containing lithium carbonate coating and its preparation field, to achieve the effect of improving cycle life, large economic value and practical value, and increasing lithium ion capacity

Inactive Publication Date: 2021-06-11
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to meet the critical gas pressure requirement, the gas production needs to reach a higher voltage or the middle and late stages of thermal runaway, and cannot generate enough gas in time to trigger the safety structure

Method used

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  • Lithium ion diaphragm containing lithium carbonate coating and preparation method of lithium ion diaphragm
  • Lithium ion diaphragm containing lithium carbonate coating and preparation method of lithium ion diaphragm
  • Lithium ion diaphragm containing lithium carbonate coating and preparation method of lithium ion diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] S1. Add the polymer rubber and lithium carbonate to the kneader for dry mixing and kneading. The stirring speed is controlled at 150r / min to obtain a mixed glue. Add anti-sedimentation agent, adhesive, and water to stir and moisten it, and suck it into the sand mill. Medium sand grinding for 1 hour, then continue to add binder and wetting agent to it and stir and mix for 10 minutes to obtain safety coating slurry.

[0034] S2. Coating the safety coating slurry on the surface of the base film;

[0035] S3. Dry the base film obtained in step S2. at 65° C. to obtain a lithium ion separator containing a lithium carbonate coating.

[0036] A kind of lithium ion membrane containing lithium carbonate coating mainly comprises: base film, the safety coating that is coated on the base film surface; Described safety coating mainly comprises mixed glue, auxiliary agent, water.

[0037] The addition amount of each raw material component in the safety coating is as follows: in perce...

Embodiment 2

[0051]S1. Add the polymer rubber and lithium carbonate to the kneader for dry mixing and kneading. The stirring speed is controlled at 150r / min to obtain a mixed glue. Add anti-sedimentation agent, adhesive, and water to stir and moisten it, and suck it into the sand mill. Medium sand grinding for 1 hour, then continue to add binder and wetting agent to it and stir and mix for 10 minutes to obtain safety coating slurry.

[0052] S2. Coating the safety coating slurry on the surface of the base film;

[0053] S3. Dry the base film obtained in step S2. at 65° C. to obtain a lithium ion separator containing a lithium carbonate coating.

[0054] A kind of lithium ion membrane containing lithium carbonate coating mainly comprises: base film, the safety coating that is coated on the base film surface; Described safety coating mainly comprises mixed glue, auxiliary agent, water.

[0055] The addition amount of each raw material component in the safety coating is as follows: in percen...

Embodiment 3

[0069] S1. Add the polymer rubber and lithium carbonate to the kneader for dry mixing and kneading. The stirring speed is controlled at 150r / min to obtain a mixed glue. Add anti-sedimentation agent, adhesive, and water to stir and moisten it, and suck it into the sand mill. Medium sand grinding for 1 hour, then continue to add binder and wetting agent to it and stir and mix for 10 minutes to obtain safety coating slurry.

[0070] S2. Coating the safety coating slurry on the surface of the base film;

[0071] S3. Dry the base film obtained in step S2. at 65° C. to obtain a lithium ion separator containing a lithium carbonate coating.

[0072] A kind of lithium ion membrane containing lithium carbonate coating mainly comprises: base film, the safety coating that is coated on the base film surface; Described safety coating mainly comprises mixed glue, auxiliary agent, water.

[0073] The addition amount of each raw material component in the safety coating is as follows: in perce...

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Abstract

The invention discloses a lithium ion diaphragm containing a lithium carbonate coating and a preparation method of the lithium ion diaphragm. The lithium ion diaphragm mainly comprises a base film and a safety coating coated on the surface of the base film, the safe coating mainly comprises mixed glue, an auxiliary agent and water; and the safe coating is prepared from the following raw material components in percentage by weight of 90 to 93 percent of mixed glue, 5.5 to 6.5 percent of auxiliary agent and the balance of water. The mixed glue mainly comprises a macromolecular glue material and lithium carbonate; and the addition amount of the lithium carbonate in the mixed glue is 0.5-2% of that of the polymer glue material. According to the present invention, the lithium carbonate-containing coating diaphragm disclosed by the invention can quickly provide gas molecules at the early stage of thermal runaway in a battery, so that the time for a safety structure to reach critical air pressure is shortened, and the safety performance of the battery is improved; the special coated diaphragm coating material containing the lithium carbonate component is simple in preparation process and relatively lower in cost, enables the safety of the battery to be remarkably improved, can realize the industrial production, and has higher economic value and practical value.

Description

technical field [0001] The invention relates to the technical field of lithium ion diaphragms, in particular to a lithium ion diaphragm containing a lithium carbonate coating and a preparation method thereof. Background technique [0002] Today, the application range of lithium-ion batteries is becoming more and more extensive, and the number of safety incidents in lithium-ion batteries is also increasing. The safety performance of lithium-ion batteries has also become the main technical key for lithium battery manufacturers. Especially for square aluminum shell batteries, since the assembly structure adopts an aluminum metal shell, once thermal runaway occurs, lithium batteries are likely to explode, catch fire and other serious safety incidents. For the sake of safety, the aluminum shell battery is equipped with ①.SSD flip plate (its withstand voltage range is 0.40-0.70MPa); ②. Safety explosion-proof valve (its general pressure is 0.85-0.95Mpa ); ③. Aluminum shell (its pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/414H01M50/403H01M10/0525H01M50/449
CPCH01M10/0525Y02E60/10
Inventor 杨开福翁星星陈朝晖盛夏
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
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