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A kind of additive for preparing lithium iron phosphate battery coating process

A technology of lithium iron phosphate and coating process, applied in battery electrodes, circuits, electrical components, etc., can solve the problem that the coating process performance of lithium iron phosphate materials cannot be fundamentally changed, the poor adhesion of oily adhesives, and the effect of Invisible and other problems, to achieve the effect of preventing process defects, reducing viscosity, and good solvent compatibility

Inactive Publication Date: 2011-12-28
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Lithium ferrous phosphate prepared in the prior art has hydrophilic and oleophobic properties, which is easy to absorb water, and has poor adhesion with oily adhesives (such as PVDF), resulting in serious powder drop during the coating process, and even the whole piece falls off , there is an urgent need to find new technologies to solve the problem
[0007] The traditional method usually uses lithium iron phosphate surface modification or secondary granulation to improve, but the effect is not obvious, and the process performance of lithium iron phosphate material coating cannot be fundamentally changed.

Method used

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  • A kind of additive for preparing lithium iron phosphate battery coating process
  • A kind of additive for preparing lithium iron phosphate battery coating process
  • A kind of additive for preparing lithium iron phosphate battery coating process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Additive raw materials are weighed according to the raw materials of the following mass percentages:

[0035] PVDF binder with NMP 10%;

[0036] Silane bonding agent 10%;

[0037] Lithium iron phosphate powder 75%;

[0038] Conductive carbon black 5%.

[0039] The preparation method of additive, comprises the following steps:

[0040] 1) Mix the weighed polyvinylidene fluoride binder and nitrogen methylpyrrole in a mass ratio of 1:2, and mix them into a mixture at a temperature of 60°C;

[0041] 2) Add additive silane bonding agent to the mixture in step 1) and mix for 1 hour;

[0042] 3) Add lithium iron phosphate powder to the homogeneously mixed mixture in step 2). The lithium iron phosphate powder is added in three equal parts and gradually added three times. When adding, the temperature of the mixture is 60°C. Add while mixing. for 2 hours;

[0043] 4) Add conductive carbon black to the concentrated mixture in step 2), and stir evenly to obtain the additive f...

Embodiment 2

[0045] Additive raw materials are weighed according to the raw materials of the following mass percentages:

[0046] PVDF binder with NMP 20%;

[0047] Titanate bonding agent 1%;

[0048] Lithium iron phosphate powder 75%;

[0049] Conductive carbon black 4%.

[0050] The preparation method of additive, comprises the following steps:

[0051] 1) Mix the weighed polyvinylidene fluoride binder and nitrogen methylpyrrole in a mass ratio of 1:1, and mix them into a mixture at a temperature of 100° C.;

[0052]2) Add the additive titanate bonding agent to the mixture in step 1) and mix for 0.5 hours;

[0053] 3) Add lithium iron phosphate powder to the homogeneously mixed mixture in step 2). The lithium iron phosphate powder is added in three equal parts and gradually added three times. When adding, the temperature of the mixture is 100°C. 0.5 hours;

[0054] 4) Add conductive carbon black to the concentrated mixture in step 2), and stir evenly to obtain the additive for lith...

Embodiment 3

[0056] Additive raw materials are weighed according to the raw materials of the following mass percentages:

[0057] PVDF binder with NMP 10%;

[0058] Borate bonding agent 2%;

[0059] Borate bonding agent 10%;

[0060] Lithium iron phosphate powder 75%;

[0061] Conductive carbon black 3%.

[0062] The preparation method of additive comprises the following steps:

[0063] 1) Mix the weighed polyvinylidene fluoride binder and nitrogen methylpyrrole in a mass ratio of 1:2, and mix them into a mixture at a temperature of 80°C;

[0064] 2) Add the additive borate bonding agent to the mixture in step 1) and mix for 1 hour; when mixing, add the above-mentioned weighed borate bonding agent solvent;

[0065] 3) Add lithium iron phosphate powder to the homogeneously mixed mixture in step 2). The lithium iron phosphate powder is added in three equal parts and gradually added three times. for 2 hours;

[0066] 4) Add conductive carbon black to the concentrated mixture in step 2)...

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Abstract

The invention discloses an additive for a lithium iron phosphate battery coating process and a preparation method thereof, comprising the following steps: 1) mixing a polyvinylidene fluoride adhesive with nitrogen methylpyrrole; 2) adding the additive to the mixture and mixing 0.5-1 hour; 3) Add lithium iron phosphate powder to the mixture, gradually add it three times, and concentrate; 4) Add conductive carbon black to the concentrated mixture, stir evenly, and obtain lithium iron phosphate battery coating technology additive. The additive has good compatibility with the electrolyte, can reduce the surface activity of lithium iron phosphate and PVDF, improve the bonding performance of the material, and solve the problem of powder dropping of the lithium iron phosphate material during the coating process.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials and battery preparation, and in particular to an additive for preparing lithium iron phosphate battery coating technology. Background technique [0002] Since the advent of lithium-ion batteries in 1991, their cathode materials have been a hot spot in material research. The current research mainly focuses on transition metal oxides containing lithium, and the transition metals are mainly nickel, cobalt, and manganese. In recent years, due to the abundance of iron in the earth's crust, its cheap price, and environmental friendliness, based on Fe 2+ / Fe 3+ Redox-coupled substances have aroused great interest, so people are racing to study iron-containing lithium salts to replace current cathode materials. [0003] In 1999, J.B.Goodenough and others from the University of Texas in the United States obtained the patent right of US Patent No.591382de lithium iron phosph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCY02E60/12Y02E60/10
Inventor 刘涛涛
Owner IRICO
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