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Conductive agent used for lithium iron phosphate battery and preparation method thereof

A lithium iron phosphate battery and conductive agent technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of limited electronic conduction capacity, affecting battery heat distribution, uneven heat conduction, etc., to improve electrochemical performance, improve The effect of placing stability and simplifying the mixing process

Active Publication Date: 2013-05-01
中创新航科技(江苏)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carbon nanotube / carbon black composite conductive agent has limited electronic conductivity and uneven heat conduction, which affects the overall heat distribution of the battery and ultimately has an adverse effect on the battery.

Method used

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  • Conductive agent used for lithium iron phosphate battery and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The conductive agent for lithium iron phosphate battery of this embodiment is made up of carbon nanotube / carbon black composite material, graphene and polyacrylic acid, and the weight ratio of carbon nanotube / carbon black composite material, graphene and polyacrylic acid is: carbon nanotube / Carbon black composite material: graphene: polyacrylic acid = 1:0.1:1.

[0018] The preparation method of the conductive agent for lithium iron phosphate battery in this embodiment, the specific steps are as follows:

[0019] (1) Pretreatment of carbon nanotube / carbon black composite material: Put the carbon nanotube / carbon black composite material into a freeze dryer, rapidly cool to -20°C and keep it warm for 2 hours, then vacuumize to 100Pa and dry for 2 hours , then keep the vacuum constant, and gradually increase the temperature to room temperature, then take the carbon nanotube / carbon black composite material out of the freeze dryer, and the pretreatment is completed;

[002...

Embodiment 2

[0022] The conductive agent for lithium iron phosphate battery of this embodiment is made up of carbon nanotube / carbon black composite material, graphene and polyacrylic acid, and the weight ratio of carbon nanotube / carbon black composite material, graphene and polyacrylic acid is: carbon nanotube / Carbon black composite material: graphene: polyacrylic acid = 1:0.1:1.

[0023] The preparation method of the conductive agent for lithium iron phosphate battery in this embodiment, the specific steps are as follows:

[0024] (1) Pretreatment of carbon nanotube / carbon black composite material: Put the carbon nanotube / carbon black composite material into a freeze dryer, rapidly cool to -20°C and keep it warm for 1 hour, then vacuumize to 100Pa and dry for 4 hours , then keep the vacuum constant, and gradually increase the temperature to room temperature, then take the carbon nanotube / carbon black composite material out of the freeze dryer, and the pretreatment is completed;

[0025...

Embodiment 3

[0027] The conductive agent for lithium iron phosphate battery of this embodiment is made up of carbon nanotube / carbon black composite material, graphene and polypropylene cyanide, and the weight ratio of carbon nanotube / carbon black composite material, graphene and polypropylene cyanide is: carbon Nanotube / carbon black composite material: graphene: polypropylene cyanide = 1:0.1:1.

[0028] The preparation method of the conductive agent for lithium iron phosphate battery in this embodiment, the specific steps are as follows:

[0029] (1) Pretreatment of carbon nanotube / carbon black composite material: Put the carbon nanotube / carbon black composite material in a freeze dryer, raise the temperature to 30°C and keep it warm for 1 hour, then vacuumize to 100Pa and dry for 3 hours , then keep the vacuum constant, and gradually lower the temperature to room temperature, then take the carbon nanotube / carbon black composite material out of the freeze dryer, and the pretreatment is com...

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Abstract

The invention discloses a conductive agent used for a lithium iron phosphate battery, and also discloses a preparation method for the conductive agent. The conductive agent consists of a carbon nanotube / carbon black composite material, graphene and a bonding agent in the weight ratio of 1:(0.001-0.1):(0.01-1). The preparation method comprises the following steps of: first, preprocessing the carbon nanotube / carbon black composite material; then, performing ultrasonic dispersion on the carbon nanotube / carbon black composite material and the bonding agent in secondary distilled water; next, adding the graphene into the secondary distilled water under the condition of ultrasonic waves; and finally, performing the ultrasonic dispersion to prepare the conductive agent. The preparation method for the conductive agent is simple; and the prepared conductive agent has uniform dispersion and high stability. The conductive agent has high electronic conductivity and uniform heat conduction; and the lithium iron phosphate battery prepared by adopting the conductive agent has remarkably improved electrochemical performance and obviously reduced alternating-current internal resistance.

Description

technical field [0001] The invention relates to the technical field of lithium ion secondary batteries, in particular to a conductive agent for lithium iron phosphate batteries and a preparation method thereof. Background technique [0002] Lithium-ion secondary battery is a new type of high-energy secondary power supply, which has the advantages of large specific capacity, high and stable discharge voltage, good low-temperature performance, environmental friendliness, safety, long life, and weak self-discharge. The above-mentioned advantages of lithium-ion secondary batteries have attracted the favor of scientists from various countries, thus promoting the rapid development of lithium-ion secondary batteries. There are many kinds of positive electrode materials for lithium-ion secondary batteries, mainly including lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, and lithium iron phosphate. Lithium iron phosphate battery is a lithium ion secondary batte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62
CPCY02E60/12Y02E60/10
Inventor 赵晓锋谢秋肖亚洲
Owner 中创新航科技(江苏)有限公司
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