Granular electrode composite material with positive temp coefficient and preparing process thereof

A positive temperature coefficient, composite material technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of reduced temperature sensitivity, increased conductive contact and manufacturing process complexity, and greater impact on battery rate performance. Temperature safety protection, reducing current, increasing the effect of impedance

Inactive Publication Date: 2009-01-14
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these two methods can play the role of temperature sensitivity inside the battery, the former PTC is layered, which invisibly increases the complexity of the conductive contact with the substrate and the manufacturing process, and has a greater impact on the rate performance of the battery; while the latter PTC The powder is partially dispersed in the electrode, greatly reducing the sensitivity to temperature

Method used

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  • Granular electrode composite material with positive temp coefficient and preparing process thereof
  • Granular electrode composite material with positive temp coefficient and preparing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Thermally dissolve polymer 5 polyethylene (PE) in its good solvent kerosene, mix well and add conductive particles 4: acetylene black, then add active material 2: LiCoO 2 . The particle size of the active material 2 is 6-15 microns, and the shell 3 accounts for 5% of the mass of the electrode composite material; after removing the good solvent, a granular composite electrode material with a positive temperature coefficient is obtained.

Embodiment 2

[0027] Polymer 5: Polyethylene (PE)

[0028] Good solvent: toluene

[0029] Conductive particle 4: Acetylene black

[0030] Active material 2: LiFePO 4

[0031] The particle size of the active material 2 is: 100-500 nanometers

[0032] The shell 3 accounts for 8% of the mass of the electrode composite material.

Embodiment 3

[0034] Polymer 5: Epoxy Resins and Curing Agents

[0035] Good solvent: ethanol

[0036] Conductive particle 4: Acetylene black

[0037] Active material 2: LiMn 2 o 4

[0038] The particle size of the active material is: 2-10 microns

[0039] The shell accounts for 5% of the mass of the electrode composite material.

[0040] figure 2 A graph showing the relationship between resistance and temperature of the electrode made of the granular composite electrode material having a temperature coefficient in Example 1 of the present invention is shown. Such as figure 2 As shown, when the temperature is low (room temperature ~ 80 ℃), the resistance of the composite electrode material is low (3 ohms), and when the temperature continues to rise, the resistance also increases. When the temperature reaches 145 ℃, the resistance (40 ohms) is more than ten times larger than the resistance (3 ohms) at room temperature, showing good PTC performance.

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Abstract

The invention discloses a grained electrode composite with positive temperature coefficient and the preparing method thereof. And the composite comprises kernel of active material and PTC shell, where the kernel mainly makes electrochemical reaction and provides battery capacity and the PTC mainly plays the role in safety protection of positive temperature coefficient. And the electrode made by the composite can sense temperature variation caused by overcurrent and short circuit in battery and in time increase impedance and reduce current to make the battery be in a safe state, preventing battery exploding or burning. When the battery temperature returns to normal, the resistance of the composite returns to lower value, assuring normal battery charge and discharge; and the composite has higher sensitivity and lower resistance value.

Description

technical field [0001] The invention relates to an electrode composite material with a positive temperature coefficient and a preparation method thereof, which is suitable for various chemical power supply fields and provides safety protection for the power supply under overcurrent, overtemperature or internal circuit conditions. It is especially suitable for lithium secondary batteries with potential safety hazards. Background technique [0002] With the development of society, mobile electronic products and electric tools gradually appear, and the chemical power supply that provides power for them has attracted people's attention. In the past two decades, the development of chemical power sources has been very rapid, and the specific energy and specific power of batteries have continued to increase. However, while pursuing battery performance, people pay more and more attention to the safety performance of the battery, such as the battery will not burn or explode under th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/48H01M4/62H01M2/34H01M4/525H01M50/581
CPCY02E60/12Y02E60/10
Inventor 曹余良杨汉西钱江峰陈重学艾新平
Owner WUHAN UNIV
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