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Composite particle for battery, battery separator, and lithium ion battery

A composite particle and battery separator technology, applied in batteries, secondary batteries, battery pack components, etc., can solve the problems of poor external temperature control, large battery thermal conduction resistance, poor thermal conductivity, etc., to improve battery safety. properties, good electrochemical performance, and the effect of reducing internal resistance

Inactive Publication Date: 2020-11-10
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For controlling the temperature of the battery, the existing technical solutions include adding a cooling system outside the battery cell, such as phase change materials, circulating water cooling, air cooling, etc., but these can only regulate the temperature outside the battery, and cannot go deep into the inside
However, the battery is a material with poor thermal conductivity. The external and internal heat conduction resistance of the battery is large, and the internal and external temperature difference will be large.
Therefore, the effect of external temperature control is not good in practical applications

Method used

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  • Composite particle for battery, battery separator, and lithium ion battery
  • Composite particle for battery, battery separator, and lithium ion battery
  • Composite particle for battery, battery separator, and lithium ion battery

Examples

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Embodiment 1

[0047] 1. Preparation of composite particles:

[0048] Paraffin (2 g), cetyltrimethylammonium bromide (CTAB, 1.5 g) and n-pentanol (10 mL) were mixed with absolute ethanol (100 mL) and ultrasonically dispersed in a three-necked flask (250 mL), followed by Stir at 60°C for 60 minutes. Then, drop 10 ml of ethyl orthosilicate into the bottle. Keep the temperature at 60° C., stir for 30 minutes, add 2 ml of ammonia water (25 wt %) dropwise, and then continue to stir the mixture at 60° C. for 2 hours. The final precipitate was fully washed with ethanol, collected by vacuum filtration, and finally dried at 50° C. for 12 hours to obtain the obtained product.

[0049] 2. Preparation of temperature-controllable diaphragm:

[0050] The composite particles and polyvinylidene fluoride (mass ratio 9:1) prepared above were dispersed in N-methylpyrrolidone (the mass ratio of composite particles to N-methylpyrrolidone was 1:20) to make a slurry. Stir the slurry overnight, then apply it wi...

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Abstract

The invention belongs to the field of batteries, and particularly relates to a composite particle for a battery, a battery diaphragm and a lithium ion battery. The composite particle for the battery comprises a phase change particle and an inorganic compound coating layer coating the surface of the phase change particle, wherein the phase change particles are paraffin, crystalline hydrated salt ormolten salt; and the inorganic compound coating layer is silicon dioxide, attapulgite, kaolinite, montmorillonite, hydrotalcite, vermiculite, sepiolite, mica, illite, diatomite, titanium dioxide, zinc oxide, aluminum oxide or nanocellulose. The composite particle for the battery provided by the invention can effectively control the internal temperature of the lithium ion battery, reduce the internal temperature fluctuation of the lithium ion battery during charging and discharging, absorb part of heat during thermal runaway, reduce the heat release amount of the battery to a certain extent, ensure the safety of the lithium ion battery, and does not affect the electrochemical performance of the battery.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a battery composite particle, a battery diaphragm and a lithium ion battery. Background technique [0002] As the energy density of lithium-ion batteries gradually increases, its safety has become a bottleneck that limits its large-scale application. When the lithium-ion battery is under abuse conditions (such as mechanical abuse, thermal abuse, etc.), internal short circuits are prone to occur, causing the battery to go out of control. The electric energy stored in the battery will be released in the form of internal energy in a short period of time, causing the internal temperature of the battery to rise sharply, causing thermal runaway of the battery, triggering fire and explosion. In addition, during the operation of the battery, it is inevitable to often encounter behaviors such as overheating (such as charging and discharging at high power, short-term high-temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/659H01M10/613H01M10/654H01M2/14H01M10/0525
CPCH01M10/0525H01M2200/10H01M10/613H01M10/654H01M10/659Y02E60/10
Inventor 刘凯袁梦琦
Owner TSINGHUA UNIV
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