Preparation method of graphene-containing lithium manganate positive pole piece

A positive electrode piece, graphene technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of no memory effect, poor conductivity of positive electrode materials, etc., and achieve the effect of increasing capacity and improving effective utilization.

Active Publication Date: 2013-11-27
德州贝珥碳纳米材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the advantages of high output voltage, large specific energy, long cycle life, superior safety performance, and no memory effect, lithium-ion batteries are widely used in portable electronic products and communication tools. In these applications, in addition to requiring large In addition to the specific capacity, the charge and discharge performance at high rates is also an extremely important technical index. In order to maintain good high rate charge and dis

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1

[0019] ① Add 2.5 g of graphene to 250 ml of isopropanol, disperse ultrasonically for 30 minutes, and let it stand for 12 hours, then remove the sediment to obtain a graphene dispersion;

[0020] ②Weigh 10 g of acetylene black and 85 g of lithium manganate in a ball mill to fully mix the mixture to obtain a mixture. The ball mill speed is 450 r / min and the ball milling time is 4 hours;

[0021] ③Weigh 5 g of polyvinylidene fluoride and dissolve it in 50 g of N-methyl-2-pyrrolidone solvent and stir to make it fully dissolved;

[0022] ④ Add the ball-milled mixture to the graphene dispersion and dry it at 100°C for 12 hours to obtain the mixture, and then add the mixture to the N-methyl-2-pyrrolidone solvent dissolved in vinylidene fluoride Then transfer to a high-speed mixer to prepare positive electrode slurry;

[0023] ⑤ Coating the obtained positive electrode slurry on aluminum foil and drying at a temperature of 100° C. to obtain a positive electrode pole piece.

Example Embodiment

[0024] Example 2

[0025] ① Add 2.5 g of graphene to 300 ml of isopropanol, disperse ultrasonically for 60 min, and leave it to stand for 24 hours, then remove the sediment to obtain a graphene dispersion;

[0026] ②Weigh 15 g of acetylene black and 80 g of lithium manganate in a ball mill and mix thoroughly to prepare the mixture. The ball mill speed is 450 r / min and the ball milling time is 4 hours;

[0027] ③Weigh 5 g polyvinylidene fluoride and dissolve it in 55 g N-methyl-2-pyrrolidone solvent and stir to fully dissolve it;

[0028] ④ Add the ball-milled mixture to the graphene dispersion and dry it at 100°C for 12 hours to obtain the mixture, and then add the mixture to the N-methyl-2-pyrrolidone solvent dissolved in vinylidene fluoride Then transfer to a high-speed mixer to prepare positive electrode slurry;

[0029] ⑤ Coating the obtained positive electrode slurry on aluminum foil and drying at a temperature of 100° C. to obtain a positive electrode pole piece.

Example Embodiment

[0030] Example 3

[0031] ① Add 1.3 g of graphene to 150 ml of isopropanol, ultrasonically disperse for 40 minutes, and let it stand for 15 hours, then remove the deposits to obtain a graphene dispersion;

[0032] ②Weigh 10g of acetylene black and 85g of lithium manganate in a ball mill to fully mix the mixture to obtain a mixture. The ball mill speed is 450 r / min and the ball milling time is 4 hours;

[0033] ③Weigh 5 g of polyvinylidene fluoride and dissolve it in 50 g of N-methyl-2-pyrrolidone solvent and stir to make it fully dissolved;

[0034] ④ Add the ball-milled mixture to the graphene dispersion and dry it at 100°C for 12 hours to obtain the mixture, and then add the mixture to the N-methyl-2-pyrrolidone solvent dissolved in vinylidene fluoride Then transfer to a high-speed mixer to prepare positive electrode slurry;

[0035] ⑤ Coating the obtained positive electrode slurry on aluminum foil and drying at a temperature of 100° C. to obtain a positive electrode pole piece.

[...

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Abstract

The invention relates to a graphene-containing lithium manganate positive pole piece is formed by applying a coating material on an aluminum foil surface. The coating material is composed of the following components in percentage by weight: 75-94% of positive pole material, 1-15% of conducting agent and 5-10% of binding agent. The positive pole piece prepared by the preparation method enhances the capacity, cycle performance and rate capability of the battery, and improves the availability of graphene.

Description

technical field [0001] The invention relates to the technical field of new energy materials, in particular to a method for preparing a lithium manganate cathode sheet containing graphene. Background technique [0002] Due to the advantages of high output voltage, large specific energy, long cycle life, superior safety performance, and no memory effect, lithium-ion batteries are widely used in portable electronic products and communication tools. In these applications, in addition to requiring large In addition to the specific capacity, the charge and discharge performance at high rates is also an extremely important technical index. In order to maintain good high rate charge and discharge characteristics and a long service life during the battery cycle, it is necessary to add a conductive agent to the electrode to fill the electrode material. The gaps generated during the process of inserting and extracting lithium maintain stable conductivity of the electrode, but the cond...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/505H01M4/62
CPCY02E60/122Y02E60/10
Inventor 孙明娟荆蒙蒙侯士峰
Owner 德州贝珥碳纳米材料研究院有限公司
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