Electrode suspension liquid and preparation method thereof

An electrode suspension and electrolyte technology, which is applied in the field of chemical energy storage, can solve the problems of decreased electrochemical performance of lithium ion flow batteries, the diameter can only reach 8 μm, and the particles are easy to agglomerate, so as to avoid rapid sedimentation, reduce loss and Scrap generation and process reduction effect

Active Publication Date: 2016-10-19
南京竞予能源有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanical grinding method includes dry grinding and wet grinding. The dry grinding process is simple, but there are problems that the particles are easy to agglomerate and unloading is difficult, and the general grinding particle size can only reach 8 μm. For materials with a particle size below 8 μm, it must be used Wet grinding; wet grinding can prevent the re-agglomeration of fine particles generated during the grinding process, and effectively achieve uniform dispersion of particles in the medium
[0008] For the electrode suspension of lithium ion flow battery, if water is used as the medium, it is not feasible for most of the electrode active materials, because the electrode active materials may have serious side reactions with water (for example: After the lithium iron phosphate material is wet-ground with water additives, it can be observed that a large amount of reddish-brown iron oxides are formed and precipitated in the aqueous solution); in addition, the dehydration and drying step after grinding is very time-consuming and energy-consuming, and the particles The process is also prone to re-agglomeration, and once the residual moisture enters the electrode suspension, it will also lead to a sharp decline in the electrochemical performance of the lithium-ion flow battery.
If the lithium-ion battery electrolyte is used as the medium, because its main components are lithium salts that are easy to react with water and volatile non-aqueous, aprotic organic solvents, they are volatile, easy to decompose and highly corrosive when exposed to water. characteristics, so the sealing, corrosion resistance of the equipment, and the problem of unstable quality due to the volatilization of the electrolyte must be considered

Method used

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  • Electrode suspension liquid and preparation method thereof
  • Electrode suspension liquid and preparation method thereof
  • Electrode suspension liquid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A positive electrode suspension and its preparation method:

[0045] The wet grinding machine used in this embodiment is a planetary ball mill. The specific implementation steps are as follows:

[0046] 1) The positive electrode active material particle is lithium iron phosphate, the conductive agent particle is Ketjen black, weigh 10g of lithium iron phosphate and 1g of Ketjen black, mix evenly, dry in an oven at 80°C for 2 hours, and add it to a ball mill;

[0047] 2) Add 100ml of diethyl carbonate into the ball mill jar;

[0048] 3) Add stainless steel grinding balls in the ball mill jar, the diameter of the grinding balls is 10mm, and the quality of the grinding balls is 100g;

[0049] 4) The ball mill jar is sealed by threads, installed on the ball mill, fixed, and subjected to high-speed grinding, the grinding speed is 500 rpm, and the time is 4 hours;

[0050] 5) After reaching the grinding time, add 50ml of dimethyl carbonate, 50ml of methyl formate, 30g of l...

Embodiment 2

[0053] A kind of negative electrode suspension and preparation method:

[0054] The wet grinding machine used in this embodiment is a sand mill. The specific implementation steps are as follows:

[0055] 1) The negative electrode active material particles are lithium titanate, and the conductive agent particles are carbon fibers. Combine 200g of lithium titanate and 40g of carbon fibers and dry them in an oven at 80°C for 2 hours;

[0056] 2) Add the lithium titanate and carbon fiber dried in step 1) into the sand mill through the powder feeding port of lithium titanate and carbon fiber, and then inject 500ml of vinyl sulfite through the solvent injection port;

[0057] 3) Completely seal the sand mill, set the speed of the sand mill to 200 rpm, and the time is 20 hours. The material is effectively dispersed and pulverized by physical effects such as strong shearing force, friction force, and high-energy ball milling. form a viscous slurry;

[0058] 4) Adjust the valve of t...

Embodiment 3

[0062] A positive electrode suspension and its preparation method:

[0063] The wet grinding machine used in this embodiment is a sand mill. The specific implementation steps are as follows:

[0064] 1) The positive electrode active material particles are lithium cobaltate, the conductive agent particles are carbon black, mix 400g lithium cobaltate and 10g carbon black, and dry in an oven at 80°C for 2 hours;

[0065] 2) Add lithium cobaltate and carbon black dried in step 1) into the sand mill through the powder feeding port of lithium cobaltate and carbon black, and then inject 1000ml propylene carbonate through the solvent injection port;

[0066] 3) Completely seal the sand mill, set the speed of the sand mill to 2000 rpm, and the time is 2 hours. The material is effectively dispersed and pulverized by physical effects such as strong shearing force, friction force, and high-energy ball milling. form a viscous slurry;

[0067] 4) Adjust the valve of the solvent injection...

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Abstract

The present invention provides a lithium ion flow cell electrode suspension liquid and a preparation method thereof. The electrode suspension liquid comprises an electrode active material, an electrolyte, an electric conduction agent, and a vinylidene fluoride-hexafluoropropylene copolymer, wherein the electrolyte comprises a grinding aid, a solvent and a lithium salt. The method comprises: mixing an electrode active material and an electric conduction agent by using a grinding aid having high boiling point and high flash point to obtain a suspending slurry having uniform and coincident components, adding a solvent and a lithium salt to the suspending slurry, and adding a proper amount of an additive vinylidene fluoride-hexafluoropropylene copolymer according to the actual use requirement so as to effectively avoid the agglomeration of the solid particles in the electrode suspension liquid, slow down the particle sedimentation rate, and improve the quality stability of the electrode suspension liquid. According to the present invention, the electrode suspension liquid prepared by the method has advantages of uniform active material particle dispersing and stable quality, and can avoid the safety problem and the quality stability problem possibly caused by the direct application of the electrolyte to prepare the electrode suspension liquid.

Description

technical field [0001] The invention belongs to the technical field of chemical energy storage, and relates to a preparation method of an electrode suspension of a lithium ion flow battery. Background technique [0002] Lithium-ion flow battery combines the advantages of lithium-ion battery and flow battery. It is a new type of rechargeable battery with independent output power and energy storage capacity, high energy density and low cost. Lithium-ion flow battery consists of positive electrode suspension pool, negative electrode suspension pool, battery reactor, sealed pipeline, liquid pump or other power devices. Wherein, the positive electrode suspension pool holds the positive electrode suspension liquid, and the negative electrode suspension liquid pool holds the negative electrode suspension liquid. When the lithium-ion flow battery is working, the electrode suspension flows between the electrode suspension pool and the battery reactor through a sealed pipeline driven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188Y02E60/50
Inventor 陈永翀冯彩梅何颖源张艳萍张萍
Owner 南京竞予能源有限公司
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