Multilayer composite positive pole piece, method for preparing pole piece and lithium ion battery applying multilayer composite positive pole piece

A positive electrode, multi-layer composite technology, used in battery electrodes, secondary batteries, battery pack components, etc., can solve problems such as low ionic conductivity, improve battery capacity, increase safety tolerance temperature, and increase reaction. Effect of contact area

Inactive Publication Date: 2015-03-25
JIANGSU QINGTAO ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ionic conductivity of this type of solid electrolyte is too low to meet commercial needs.

Method used

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  • Multilayer composite positive pole piece, method for preparing pole piece and lithium ion battery applying multilayer composite positive pole piece
  • Multilayer composite positive pole piece, method for preparing pole piece and lithium ion battery applying multilayer composite positive pole piece
  • Multilayer composite positive pole piece, method for preparing pole piece and lithium ion battery applying multilayer composite positive pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Al2O3 multilayer composite positive pole piece S1

[0031] (1) Dissolve 2.0g of aluminum nitrate in 20g of deionized water, then add 20g of polyvinyl alcohol aqueous solution with a mass concentration of 10%, and stir thoroughly to obtain a precursor solution; add the above precursor solution into the syringe of the electrospinning equipment, Obtain precursor fibers by electrospinning (spinning conditions: spinning voltage 30KV, extrusion speed 2.0ml / min); after repeating the above steps several times, obtain multiple precursor fibers; remove all fibers from the receiving plate , calcined in a medium-temperature furnace at 1000°C for 10 hours, and collected a total of 50.5 g of aluminum oxide fiber powder obtained. The average length of the aluminum oxide fiber was 0.5 microns, and the average diameter was 50 nanometers; The aluminum fiber powder is evenly dispersed in water, and under the condition of heating in a water bath at 80 degrees Celsius, add the si...

Embodiment 2

[0033] Example 2: Magnesium oxide, titanium dioxide multilayer composite positive pole piece S2

[0034] (1) Dissolve 2.0g of magnesium nitrate in 20g of deionized water, then add 20g of 10% polyvinyl alcohol solution in mass concentration, and stir thoroughly to obtain a precursor solution; add the above precursor solution into the syringe of the electrospinning equipment, and pass Electrospinning method to obtain precursor fibers (spinning conditions: spinning voltage 30KV, extrusion speed 2.0ml / min); after repeating the above steps several times, multiple precursor magnesium oxide fibers were obtained; all magnesium oxide fibers were obtained from The receiving plate was removed, and calcined at 1200° C. for 10 hours in a high-temperature furnace, and a total of 40.5 g of magnesium oxide and titanium dioxide fiber powders obtained were collected. The average length of the magnesium oxide fibers was 3 microns, and the average diameter was 300 nanometers; the magnesium oxide ...

Embodiment 3

[0036] Example 3: Attapulgite clay multilayer composite positive electrode sheet S3

[0037] (1) Attapulgite clay is selected from samples that have been purified by physical flotation (purchased from Jiangsu Jiuchuan Nano Material Technology Co., Ltd.), produced in Jiangsu-Anhui area, with a rod-like microscopic appearance, an average length of 1 micron, and an average 2:1 type clay mineral with a diameter of 0.05 microns; uniformly disperse the attapulgite clay fiber powder in water, add the silane coupling agent KH570 solution under the condition of heating in a water bath at 80 degrees Celsius, soak for 2 hours, and then filter , dry, and complete surface lipophilic treatment; weigh 28.0g of pretreated mineral fiber powder, 11.6g of polyvinylidene fluoride, and 0.4g of polyethylene glycol, dissolve in 30g of ethanol, and fully stir to form a protective layer slurry material;

[0038] (2) Dissolve 20g of lithium cobaltate, 1g of conductive carbon black, and 1g of polyvinyl...

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Abstract

The invention relates to the field of lithium ion batteries and in particular provides a multilayer composite positive pole piece, a method for preparing the pole piece and a secondary lithium ion battery applying the multilayer composite positive pole piece. The composite positive pole piece comprises a current collector layer, a positive active function layer and a safety protection layer formed on the positive active function layer. According to the positive pole piece disclosed by the invention, the condition that inner short circuit occurs because a negative pole material of the lithium ion battery is directly contacted with a positive active material is avoided, the safety performance is good, and the battery of the composite positive pole piece is applied to power batteries.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, and more specifically provides a high-safety multilayer composite positive pole piece, a preparation method of the pole piece, and a lithium-ion secondary battery using the pole piece. Background technique [0002] Compared with traditional lead-acid batteries, lithium-ion secondary batteries have higher operating voltage, higher energy density, wider application temperature range, longer cycle life, lower self-discharge rate and environmental pollution during manufacturing Due to the advantages of small size, it has been widely used as a mobile power source for various electronic devices in recent years. However, when the lithium-ion secondary battery is used in a harsh natural environment or has a large charge-discharge rate, due to battery design defects, battery materials, etc. Due to poor quality and inadequate safety protection measures, safety accidents such as burning or explosion are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M4/622H01M4/625H01M10/0525H01M50/431H01M50/44Y02E60/10
Inventor 李峥冯玉川杨帆沈洋南策文
Owner JIANGSU QINGTAO ENERGY TECH
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