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Lithium ion battery electrode based on graphene and preparation method thereof

A lithium-ion battery and graphene technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as high cost, poor heat dissipation performance, safety and rate performance deviation, etc., and achieve high electronic conductivity, lithium-ion The effect of large diffusion coefficient and simple preparation process

Inactive Publication Date: 2015-05-06
SHANGHAI YUEDA NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional lithium-ion battery electrodes have disadvantages such as poor heat dissipation performance, deviation in safety and rate performance, and high cost.

Method used

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  • Lithium ion battery electrode based on graphene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Weigh graphene and NMP according to the weight ratio of 1:30, and ultrasonically disperse at 30°C for 6 hours before use;

[0022] (2) Weigh the spinel lithium manganate, conductive agent, and pvdf according to the mass ratio of 80:10:10, and the ratio of graphene, acetylene black, and KS-6 in the conductive agent is 1:5:4 [Note: Graphene has been prepared in (1) and ready for use], add 1.5 times the total mass of NMP to prepare the slurry, and spray the graphene mixture prepared in (1) into the electrode slurry during the slurry preparation process, and then The evenly mixed battery slurry was scraped onto aluminum foil ( figure 1 Middle 1) Bake at 120°C for 4 hours to obtain a 50 μm thick electrode material coating ( figure 1 Middle 2) Lithium-ion battery electrodes are made.

Embodiment 2

[0026] (1) Weigh graphene and NMP according to the weight ratio of 1:100, and ultrasonically disperse at 40°C for 3 hours before use;

[0027] (2) Weigh lithium iron phosphate, conductive agent, and pvdf according to the mass ratio of 80:10:10, and the proportion of graphene, acetylene black, and SO in the conductive agent is 1:5:4 [Note: graphene has been (1 ) to be ready for use], add 1 times the total mass of NMP to prepare the slurry, spray the graphene mixture prepared in (1) into the electrode slurry during the slurry preparation process, and then mix the uniformly mixed battery slurry Feed roller coated onto aluminum foil ( figure 1 Middle 1) Bake at 110°C for 7 hours to obtain a 100 μm thick electrode material coating ( figure 1 Middle 2) Lithium-ion battery electrodes are made.

Embodiment 3

[0031] (1) Weigh graphene and NMP according to the weight ratio of 1:500, and ultrasonically disperse at 30°C for 5 hours before use;

[0032] (2) Weigh nickel-cobalt lithium manganese oxide, conductive agent, and pvdf according to the mass ratio of 80:10:10, and the proportion of graphene, acetylene black, and KS-6 in the conductive agent is 2:5:3 [Note: graphite Graphene has been prepared in (1) for use], add 1.3 times the total mass of NMP to prepare the slurry, spray the graphene mixture prepared in (1) into the electrode slurry during the slurry preparation process, and then uniformly The mixed battery slurry is sprayed onto aluminum foil ( figure 1 Middle 1) bake at 120°C for 5 hours to obtain a 90 μm thick electrode material coating ( figure 1 Middle 2) Lithium-ion battery electrodes are made.

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Abstract

The invention discloses a lithium ion battery electrode based on graphene and a preparation method thereof. The lithium ion battery electrode comprises a base body and an electrode material coating containing graphene. Graphene is relatively effectively conveniently dispersed in the battery material, the electric conduction characteristic of graphene is utilized and is fully given play, and thus the performances of the electrode material is relatively fully effectively given play, the integral homogeneity and the batch consistency of the lithium ion battery electrode are improved, and various performances of the lithium ion battery are greatly improved. The provided lithium ion battery electrode is high in electron conductivity and large in lithium ion diffusion coefficient. Also, the preparation method of the lithium ion battery electrode is simple in technology, and is extremely easy for realizing industrialization and continuous production.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a graphene-based lithium ion battery electrode and a preparation method thereof. Background technique [0002] As a high-performance secondary green battery, lithium-ion batteries have the advantages of high voltage, high energy density, low self-discharge rate, wide temperature range, long cycle life, environmental protection, no memory effect, and high current charge and discharge. In recent years, the application field of lithium-ion batteries has gradually expanded from digital products such as mobile phones and digital cameras to new application fields such as new energy vehicles, electric tools, and energy storage. The performance requirements for lithium-ion batteries have become more stringent. Applications in new fields require that the defects or deficiencies of lithium-ion batteries must be improved. [0003] A lithium ion battery includes at least one set of posi...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/1393
CPCH01M4/133H01M4/1393H01M10/0525Y02E60/10
Inventor 黎阳谢华清成信刚
Owner SHANGHAI YUEDA NEW MATERIAL TECH
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