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A kind of phase change temperature control type electrode and its preparation method and lithium ion battery

A phase change temperature control and electrode technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of heating of electrode sheets, achieve the effect of eliminating heat peaks, avoiding adverse effects, and high phase change heat storage enthalpy

Active Publication Date: 2021-06-15
深圳航美新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a phase-change temperature-controlled pole piece and its preparation method and a lithium-ion battery, aiming at solving the problem of heating of the electrode piece in the existing lithium battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] 1) Add 30g of polyvinylidene fluoride binder into a high-speed stirrer, then add 1500g of NMP solvent, and stir at 500rpm for 12h to obtain a uniform transparent or translucent solution.

[0064] 2) Then 370g nanoscale LiFePO 4 Add to the stirrer in 4 times, and stir at 1800rpm for 1h after each addition.

[0065] 3) Add 25g of conductive graphite into the stirrer at one time, and then stir at 1800rpm for 1h.

[0066] 4) Finally, 75 g of phase-change microcapsules were added into the stirrer three times, and stirred at 600 rpm for 30 min after each addition.

[0067] 5) Vacuumize the slurry obtained in step 4) to remove air bubbles, the vacuuming time is 80min, and the vacuum degree is -0.090MPa.

[0068] 6) Apply the electrode slurry containing phase-change microcapsules obtained in step 5) on the positive electrode aluminum foil current collector with a scraper, and the front and back sides are coated with a thickness of about 100 μm, dried and pressed to obtain the...

Embodiment 2

[0071] 1) Add 30g of polyvinylidene fluoride binder into a high-speed stirrer, then add 1500g of NMP solvent, and stir at 500rpm for 12h to obtain a uniform transparent or translucent solution.

[0072] 2) Then 320g nanoscale LiFePO 4 Add to the stirrer in 3 times, and stir at 1800rpm for 1h after each addition.

[0073] 3) Add 25g of conductive graphite into the stirrer at one time, and then stir at 1800rpm for 1h.

[0074] 4) Finally, 125 g of phase-change microcapsules were added into the stirrer in 4 times, and stirred at 600 rpm for 30 min after each addition.

[0075] 5) Vacuumize the slurry obtained in step 4) to remove air bubbles, the vacuuming time is 80min, and the vacuum degree is -0.090MPa.

[0076] 6) Apply the electrode slurry containing phase-change microcapsules obtained in step 5) on the positive electrode aluminum foil current collector with a scraper, and the front and back sides are coated with a thickness of about 100 μm, dried and pressed to obtain the...

Embodiment 3

[0079] 1) Add 24g of styrene-butadiene emulsion (solid content is 50%) in the high-speed stirrer, then add 1500g of deionized water to dilute, then add 3.0g of carboxymethylcellulose viscosifier, and stir with 800rpm rotating speed After 10 hours, a uniform transparent or translucent solution was obtained.

[0080] 2) Then add 355g of natural graphite into the stirrer in 3 times, and stir at 1800rpm for 1h after each addition.

[0081] 3) Add 5 g of conductive carbon black into the stirrer at one time, and then stir at 1800 rpm for 1 h.

[0082] 4) Finally, 125 g of phase-change microcapsules were added into the stirrer in 4 times, and stirred at 600 rpm for 30 min after each addition.

[0083] 5) Vacuumize the slurry obtained in step 4) to remove air bubbles, the vacuuming time is 80min, and the vacuum degree is -0.090MPa.

[0084] 6) Apply the electrode slurry containing phase-change microcapsules obtained in step 5) on the negative electrode copper foil current collector ...

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PUM

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Abstract

The invention discloses a phase change temperature control electrode, a preparation method thereof and a lithium ion battery. Wherein, the phase-change temperature-control electrode includes: a current collector, a phase-change microcapsule layer coated on the current collector; the phase-change microcapsule layer is prepared from the following components, in parts by weight, including: : 50-300 parts of phase-change microcapsules, 800-1000 parts of electrode active materials, 20-100 parts of conductive materials, 20-50 parts of adhesives, and 1500-2500 parts of solvents. The surface of the phase-change temperature-controlling electrode described in the present invention is covered with a phase-change microcapsule layer, and the phase-change microcapsule layer has a relatively high phase-change heat storage enthalpy value, which can make the battery electrode sheet under the condition of overheating , to absorb excess heat and eliminate heat peaks; and when the external environment temperature is low, the phase change microcapsule layer can release the stored heat to heat the battery and avoid the adverse effects of low temperature on the battery working conditions.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a phase-change temperature-controlled electrode, a preparation method thereof, and a lithium-ion battery. Background technique [0002] With the rapid development of the lithium battery energy industry, the pursuit of high specific energy density and high charge-discharge rate has become a trend. However, the ensuing thermal management and safety issues of lithium batteries also need to be resolved urgently. For example, lithium-ion battery packs will generate a lot of heat during charging and discharging, especially under the conditions of fast charging and high-power discharging, the temperature of the battery core will rise sharply. According to industry-related tests, lithium batteries will seriously affect their cycle life when the temperature exceeds 60°C, and increase the risk of spontaneous combustion due to temperature out of control. Therefore, how to di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/613H01M10/615H01M10/654H01M10/659H01M4/133H01M4/136H01M4/58H01M4/587H01M10/0525H01M4/1393H01M4/1397
CPCH01M4/133H01M4/136H01M4/1393H01M4/1397H01M4/5825H01M4/587H01M4/628H01M10/0525H01M10/613H01M10/615H01M10/654H01M10/659Y02E60/10
Inventor 黄宏波路华李鹏张洪涛
Owner 深圳航美新材料科技有限公司
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