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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 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 the stable conductivity of the electrode, but the conductive agents in the prior art, such as conductive carbon black or conductive graphite, cannot fundamentally solve the problem of poor conductivity of positive electrode materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] ② Weigh 10 g of acetylene black and 85 g of lithium manganate and mix them thoroughly in a ball mill to obtain a mixture. The speed of the ball mill is 450 r / min, and the ball milling time is 4 hours;

[0020] ③ Weigh 5 g of polyvinylidene fluoride and dissolve in 50 g of N-methyl-2-pyrrolidone solvent and stir to fully dissolve;

[0021] ④ Add the above ball-milled mixture to the graphene dispersion, and dry it at 100°C for 12 hours to obtain the mixture, then add the above mixture to the N-methyl-2-pyrrolidone solvent dissolved in vinylidene fluoride In, then transferred to a high-speed mixer to make positive electrode slurry;

[0022] ⑤ Coat the obtained positive electrode slurry on the aluminum foil, and dry it at 100°C to obtain the positive electrode sheet.

[0023] Example 2

Embodiment 2

[0025] ② Weigh 15 g of acetylene black and 80 g of lithium manganate and mix them thoroughly in a ball mill to obtain a mixture. The speed of the ball mill is 450 r / min, and the ball milling time is 4 hours;

[0026] ③ Weigh 5 g of polyvinylidene fluoride and dissolve it in 55 g of N-methyl-2-pyrrolidone solvent and stir to fully dissolve it;

[0027] ④ Add the above ball-milled mixture to the graphene dispersion, and dry it at 100°C for 12 hours to obtain the mixture, then add the above mixture to the N-methyl-2-pyrrolidone solvent dissolved in vinylidene fluoride In, then transferred to a high-speed mixer to make positive electrode slurry;

[0028] ⑤ Coat the obtained positive electrode slurry on the aluminum foil, and dry it at 100°C to obtain the positive electrode sheet.

[0029] Example 3

Embodiment 3

[0031] ② Weigh 10 g of acetylene black, 85 g of lithium manganate and fully mix in a ball mill to obtain a mixture. The speed of the ball mill is 450 r / min, and the ball milling time is 4 hours;

[0032] ③ Weigh 5 g of polyvinylidene fluoride and dissolve it in 50 g of N-methyl-2-pyrrolidone solvent and stir to fully dissolve it;

[0033] ④ Add the above ball-milled mixture to the graphene dispersion, and dry it for 12 hours at 100°C to obtain the mixture, then add the above mixture to the N-methyl-2-pyrrolidone solvent dissolved in vinylidene fluoride in, then transferred to a high-speed mixer to make positive electrode slurry;

[0034] ⑤ Coat the obtained cathode slurry on an aluminum foil and dry it at 100°C to obtain the cathode sheet.

[0035] The beneficial effect of the invention is that the positive pole piece prepared by the preparation method of the graphene-containing lithium manganate positive pole piece improves the capacity, cycle performance and rate performanc...

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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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