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Multifunctional integrated composite electrode slurry material containing active carbonyl polymer and preparation method of slurry material

A composite electrode and electrode slurry technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of lower battery energy density, slow lithium ion diffusion, lower battery power density, etc. Effects of chemical activity, improved lithium ion diffusivity, and electrode stability

Inactive Publication Date: 2019-03-01
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these commonly used electrode materials have poor conductivity, and the diffusion rate of lithium ions is slow. In the process of electrode preparation, a large amount of conductive agent needs to be added, so a certain amount of binder and stabilizer need to be added to ensure the active material and conductivity. Stable and uniform contact between agents
At present, the binders used in the preparation of lithium-ion battery electrode slurry are usually non-electroactive polyvinylidene fluoride, polyvinyl alcohol, polytetrafluoroethylene, polyethylene glycol, carboxymethyl cellulose and modified SBR. Rubber, etc., conductive paste stabilizers are usually inactive sodium dodecylsulfonate, sodium dodecylbenzenesulfonate, polyvinyl alcohol, sodium lignosulfonate, cetyltrimethylammonium bromide , polyvinylpyrrolidone, although these electrochemically inactive components can stabilize the electrode structure, their addition will also lead to a decrease in the energy density of the battery, and will also hinder the diffusion of electrons and ions during the electrochemical reaction , reducing the power density of the battery

Method used

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  • Multifunctional integrated composite electrode slurry material containing active carbonyl polymer and preparation method of slurry material
  • Multifunctional integrated composite electrode slurry material containing active carbonyl polymer and preparation method of slurry material

Examples

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Embodiment 1

[0024] The first embodiment provides a polyimide-containing lithium iron phosphate electrode slurry and a preparation method thereof.

[0025] Preparation:

[0026] 1) Weigh 30.08g of lithium iron phosphate, 0.48g of carbon black, add 12.12g of N-methylpyrrolidone (NMP), mix evenly, put into a double planetary vacuum mixer and stir in three stages for 10min, 20min, 90min respectively, set the speed They are 100rpm, 300rpm and 500rpm respectively.

[0027] 2) Add 0.48g of carbon nanotubes to 9.024g of NMP, ultrasonically disperse for 3 hours, then add 0.096g of polyimide (made from 1,4,5,8-naphthalene tetracarboxylic anhydride and 1,3,5-tri(4 - aminobenzene) benzene synthesis), magnetic stirring at 450rpm for 2h to make a stable carbon nanotube dispersion.

[0028] 3) Weigh 0.544g of the above-mentioned polyimide and 0.64g of polyvinylidene fluoride (PVDF), respectively, add 7.1g of solvent NMP, and magnetically stir at 500rpm for 12h to prepare a mixed solution.

[0029] 4)...

Embodiment 2

[0036] The preparation method of the polyimide-containing lithium iron phosphate electrode slurry provided in this embodiment 2 includes the following steps:

[0037] 1) Weigh 28.96g of lithium iron phosphate and 0.224g of carbon black, add them to 8g of NMP, mix them evenly, put them into a double planetary vacuum mixer and stir them in three stages for 10min, 10min, and 90min respectively, and set the speeds at 100rpm, 200rpm, and 500rpm respectively.

[0038] 2) Add 0.256g of graphene powder to 4.76g of NMP, after ultrasonic dispersion for 2h, add 0.1024g of polyimide (synthesized from 1,4,5,8-naphthalene tetracarboxylic anhydride and sunflower diamine), at 500rpm Stir magnetically for 2 hours to prepare a stable graphene dispersion.

[0039] 3) Weigh 1.2g of polyvinylidene fluoride (PVDF) as a binder, and weigh 1.2g of the above-mentioned polyimide, add it to 5g of NMP, stir magnetically at 500rpm for 12h, and prepare a binder solution.

[0040] 4) The graphene dispersion...

Embodiment 3

[0043] The preparation method of the lithium cobaltate electrode slurry containing polyimide and polymethyl methacrylate (PMMA) provided in the present embodiment three comprises the steps:

[0044] 1) Weigh 28.8g of lithium cobaltate, 0.64g of carbon black, add 12.12g of solvent NMP, mix evenly, put into a double planetary vacuum mixer and stir for 20min and 90min respectively in two stages, and set the speed at 300rpm and 500rpm respectively.

[0045] 2) Add 0.64g graphene powder to 12.032g NMP, ultrasonically disperse for 2 hours, add 0.064g polyimide (synthesized from pyromellitic anhydride and p-phenylenediamine), 0.064 polyvinylpyrrolidone, magnetic force at 500rpm Stir for 2h to make a stable graphene dispersion.

[0046] 3) Weigh 1.792g of polymethyl methacrylate (PMMA) to replace the binder, add 8g of solvent NMP, and stir magnetically at 500rpm for 12h to make a solution.

[0047] 4) Add the graphene dispersion to the stirred lithium cobaltate and carbon black mixtu...

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Abstract

The invention provides a multifunctional integrated composite electrode slurry material containing an active carbonyl polymer and a preparation method of the slurry material. The active carbonyl polymer can partially or completely replace a traditional binder and a stabilizer, and thus the consumption of inactive components in the traditional electrode slurry material is decreased, and the lithiumion diffusion capability of the electrode is improved; and meanwhile, the capacity can be contributed by the active carbonyl, so that the power density and energy density of the electrode are effectively improved. The electrode slurry material containing the active carbonyl polymer is characterized in that in solid phase components, the mass fraction of an electrode active material is 90-95 %, the mass fraction of a conductive additive is 0.5-5 %, the mass fraction of the active carbonyl polymer is 0.5-12 %, the mass fraction of the binder is 0-10 %, and the mass fraction of the stabilizer is0-2 %.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a multifunctional integrated composite electrode slurry containing an active carbonyl polymer and a preparation method thereof. technical background [0002] Energy shortage and environmental pollution are serious in today's society. Sustainable development is the common aspiration and goal of all mankind, which has led to the rapid development of new energy technologies, and lithium-ion batteries are an important part of the development of new green energy. Lithium-ion batteries have been widely used in mobile electronic devices, electric vehicles, aerospace and large-scale energy storage due to their long service life, high safety, and environmental protection. [0003] Traditional lithium-ion battery electrode paste mainly includes active materials, conductive additives, binders, stabilizers and solvents. Active materials provide energy density, conductive additives improv...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/622H01M4/625H01M10/0525Y02E60/10
Inventor 杨应奎沙宗枫何承恩章庆黄志勇
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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