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A kind of method of doping graphene in cathode slurry of lithium iron phosphate battery

A lithium iron phosphate battery and positive electrode slurry technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of reducing the theoretical capacity and cycle life of batteries

Active Publication Date: 2017-02-15
HEFEI HENGNENG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reduce the theoretical capacity and cycle life of the battery, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment is the stirring method of the positive electrode slurry doped with graphene in the manufacturing process of lithium iron phosphate battery according to the present invention. A 100Ah battery is made according to the conventional production process of lithium iron phosphate, and the positive electrode is stirred according to the following stirring process

[0032] 1) Weigh 0.109kg of few-layer graphene, 3.44kg of ethanol, and 0.073kg of surfactant into the No. 1 stirring tank, stir slowly and turn on "5Hz" for 30 minutes, and then start to infiltrate. The infiltration time is 8h.

[0033] 2) Weigh 0.326kg of conductive agent and add it to No. 1 stirring tank, turn on "6Hz", and stir for 1h.

[0034] 3) Weigh 2.9kg of LA132 water-based glue (the solid content of LA132 water-based glue is 15%) and 2kg of deionized water into the No. 2 stirring tank, and stir for 0.5h with revolution "30Hz" and rotation "20Hz".

[0035] 4) Add 6.5kg of lithium iron phosphate...

comparative example 2

[0041] This example is a stirring process of conventional cathode slurry doped with graphene in the manufacturing process of lithium iron phosphate battery

[0042] Make a 100Ah battery according to the conventional production process of lithium iron phosphate, and stir the positive electrode according to the following stirring process

[0043] 1. First add 5kg of lithium iron phosphate powder to the No. 1 mixing tank, then add 0.326kg of conductive agent, stir for 10 minutes at revolution "5Hz" and rotation "5Hz", then add 5kg of lithium iron phosphate powder and 0.109kg The graphene was stirred for 2 hours with revolution "20Hz" and rotation "10Hz".

[0044] 2. Weigh 2.9kg of LA132 water-based glue (the solid content of LA132 water-based glue is 15%) and 5.88kg of deionized water, add it to No. 2 stirring tank, and stir for 0.5h with revolution "30Hz" and rotation "20Hz".

[0045] 3. Add 6.146kg of 70% diluent glue in the No. 2 mixing tank to the No. 1 mixing tank, and stir...

comparative example 3

[0049] This example is a stirring process of conventional cathode slurry doped with graphene in the manufacturing process of lithium iron phosphate battery

[0050] Make a 100Ah battery according to the conventional production process of lithium iron phosphate, and stir the positive electrode according to the following stirring process

[0051] 1. First add 5.2kg of deionized water to the mixing tank, then add 2.9kg of LA132 water-based glue (the solid content of LA132 water-based glue is 15%), and stir for 0.5h at revolution "30Hz" and rotation "25Hz".

[0052] 2. Weigh 0.326kg of conductive agent and add it to the water-based glue diluted in the mixing tank, and disperse at a high speed of "35Hz" for revolution and "35Hz" for rotation for 1 hour.

[0053] 3. Weigh 0.109kg of graphene and add it to the water-based glue diluted in the stirring tank, and disperse at a high speed of "35Hz" for revolution and "35Hz" for rotation for 1.5h.

[0054] 4. Weigh 5kg of lithium iron ph...

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Abstract

The invention discloses a method for doping graphene in a lithium iron phosphate battery anode slurry. The method comprises the following steps: 1, slowly stirring graphene in ethanol and adding a small amount of a surfactant for infiltration for a period of time; 2, adding a conductive agent into the infiltrated graphene and stirring; 3, adding an aqueous glue to the deionized water, mixing and diluting; 4, adding lithium iron phosphate to the diluted aqueous glue and stirring; 5, adding the infiltrated and stirred graphene and conductive agent to the stirred lithium iron phosphate and conducting high density stirring; 6, adding the remaining the deionized water to the slurry after the viscosity of the slurry reaches a certain value and conducting rotation and revolution for a period of time in the slurry; and 7, adding an appropriate amount of water to adjust to the slurry to a proper viscosity, so as to obtain the dispersed slurry. The method provided by the invention can improve the dispersion effect of graphene and improve the production efficiency, and is beneficial to the performance of graphene and improvement of gram capacity and rate of the battery anode.

Description

technical field [0001] The invention belongs to the field of lithium battery manufacture, and in particular relates to a method for doping graphene with positive electrode slurry of a lithium iron phosphate battery. Background technique [0002] With the development of industry, the rapid growth of energy consumption, and the pollution is becoming more and more serious, PM2.5 has become a hot topic, more and more people are beginning to pay attention to the health hazards of air pollutants, "new energy vehicles" Words such as "green transportation" have become the focus. Lithium iron phosphate has the advantages of non-toxic, non-polluting, good safety performance, wide source of raw materials, cheap price, and long life. It has become an ideal cathode material for a new generation of lithium-ion batteries. [0003] Lithium iron phosphate itself has poor conductivity, slow diffusion of lithium ions causes the actual specific capacity to be low when the battery is charged and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62H01M4/36
CPCH01M4/1397H01M4/5825H01M4/587H01M4/62Y02E60/10
Inventor 林彭桃君蒋森吴树森陈夕顺钱勇
Owner HEFEI HENGNENG NEW ENERGY TECH