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EVA (ethylene vinyl acetate) based PTC (phenylthiocarbamide) composite material, lithium battery anode and lithium battery

A technology of composite materials and lithium batteries, which is applied in the field of electrochemistry, can solve problems such as incomplete protection, remote components, and lagging safety protection of lithium-ion batteries, so as to prevent thermal runaway, improve safety performance, and reduce heat.

Inactive Publication Date: 2012-10-24
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented new type of polymeric composition used in making electric conductors or resistive elements improves their properties by controllably changing its electrical characteristics at specific temperatures. It also allows for better control over how much energy it generates during charging and discharges compared to previous methods that had lower curie temperatures (approaching 75-80%). Overall this technology helps make sure things are done safely while still producing high power density from lithiated carbon anode materials such as LiCoO2 cathodes.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the safety properties of Lithium ion batteries due to excessive temperatures caused during use that could potentially damage them overheating accidental fires or explode under severe situations.

Method used

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  • EVA (ethylene vinyl acetate) based PTC (phenylthiocarbamide) composite material, lithium battery anode and lithium battery
  • EVA (ethylene vinyl acetate) based PTC (phenylthiocarbamide) composite material, lithium battery anode and lithium battery
  • EVA (ethylene vinyl acetate) based PTC (phenylthiocarbamide) composite material, lithium battery anode and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The preparation of EVA base PTC composite material comprises steps:

[0044] Using petroleum ether as a solvent, put PEO, acetylene black, and EVA260 in a condensing reflux device in proportion to stirring for 5 h at 105 °C to obtain an EVA-based PTC composite material slurry, which was then dried to obtain an EVA-based PTC composite material. The mass percent contents of PEO, acetylene black and EVA260 were 1%, 16% and 83% respectively.

[0045] Adopt following method to measure the temperature resistance characteristic of present embodiment EVA base PTC composite material:

[0046] Put the EVA-based PTC composite material slurry into a mold to dry, cut into sheets with a length of 10mm, a width of 10mm, and a thickness of 0.4mm, measure its resistance at different temperatures, and obtain the change curve of its resistance with temperature, see figure 1 . It can be seen from the figure that the resistivity of the sample begins to rise rapidly at 62 °C, and the resis...

Embodiment 2

[0049] The preparation of EVA base PTC composite material comprises steps:

[0050] Using petroleum ether as a solvent, put PEO, acetylene black, and EVA260 in a condensing reflux device in proportion to stirring for 5 h at 105 °C to obtain an EVA-based PTC composite material slurry, which was then dried to obtain an EVA-based PTC composite material. The mass percent contents of PEO, acetylene black and EVA260 are 10%, 30% and 60% respectively.

[0051] Adopt the method identical with embodiment 1 to test the temperature resistance characteristic of the present embodiment EVA base PTC composite material, the result sees figure 2 , it can be seen from the figure that the EVA-based PTC composite material in this example has a positive temperature coefficient characteristic, and its Curie temperature is about 90 °C.

[0052]

Embodiment 3

[0054] The preparation of EVA base PTC composite material comprises steps:

[0055] Using petroleum ether as a solvent, put PEO, acetylene black, and EVA260 in a condensing reflux device in proportion to stirring for 5 h at 105 °C to obtain an EVA-based PTC composite material slurry, which was then dried to obtain an EVA-based PTC composite material. The mass percentage contents of PEO, acetylene black and EVA260 are 10%, 10% and 80% respectively.

[0056] Adopt the method identical with embodiment 1 to test the temperature resistance characteristic of the present embodiment EVA base PTC composite material, the result sees image 3 , it can be seen from the figure that the EVA-based PTC composite material in this example has a positive temperature coefficient characteristic, and its Curie temperature is about 80 °C.

[0057]

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Abstract

The invention provides an EVA (ethylene vinyl acetate) based PTC (phenylthiocarbamide) composite material, a lithium battery anode and a lithium battery. The EVA based PTC composite material comprises the following components by mass: 60-83% of ethylene-vinyl acetate copolymer base material, 10-30% of conductive additive and 1-10% of dispersant. The Curie temperature of the EVA based PTC composite material is 90 DEG C. The EVA based PTC composite material is applied to the lithium ion battery anode to effectively prevent thermal runaway of the lithium ion battery so as to improve thermal safety performance of the lithium ion battery.

Description

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Claims

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Application Information

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Owner WUHAN UNIV
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