A kind of positive electrode of lithium ion battery coated with gel polymer and preparation method thereof

A lithium-ion battery, polymer technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of uneven coating, unfavorable transmission, failure to achieve ideal coating effects, etc., to achieve simple coating process, slow down Effects of interfacial side reactions, excellent cycling performance, and thermodynamic stability

Active Publication Date: 2018-06-12
HUNAN SHANSHAN NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these coatings can slow down the reaction between the positive electrode and the electrolyte to a certain extent, there is a problem of uneven coating, and they are electrochemically inert, which is not conducive to Li + Therefore, the improvement of battery performance is limited, and the ideal coating effect cannot be achieved.
For example, in the Chinese patent CN102956895A, by coating the surface of the positive electrode material with non-electrochemically active Al 2 o 3 -AlPO 4 composite layer to prevent the contact of the positive electrode material with the electrolyte, but because the coating layer is not electrochemically active, that is, there is no Li + Passability, although it can improve the material performance to a certain extent, but it has not achieved the optimal effect

Method used

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  • A kind of positive electrode of lithium ion battery coated with gel polymer and preparation method thereof
  • A kind of positive electrode of lithium ion battery coated with gel polymer and preparation method thereof
  • A kind of positive electrode of lithium ion battery coated with gel polymer and preparation method thereof

Examples

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Effect test

Embodiment 1

[0031] A preparation method of a lithium ion battery positive electrode coated with a gel polymer of the present invention, comprising the steps of:

[0032] Step 1: Weigh 9.4g Li(Ni 0.5 co 0.2 mn 0.3 )O 2 After the positive electrode active material, 0.3g conductive agent, and 0.3g binder polyvinylidene fluoride (PVDF) are mixed evenly, they are added to the organic solvent N-methylpyrrolidone (NMP) and stirred repeatedly until uniform to obtain the positive electrode slurry; The positive electrode slurry is coated on a 20 μm thick current collector aluminum foil, and placed in a vacuum drying oven at 120°C for 10 hours to obtain the positive electrode sheet;

[0033] Step 2: Add 1.0g of tris(2-acryloyloxyethyl)phosphate (TAEP) to 200g of acetone solution, followed by adding 1.0mg of 2-methyl-2-hydroxy-1-phenylacetone (HMPP) The initiator is uniformly mixed to obtain a tris (2-acryloyloxyethyl) phosphate (TAEP) solution with a concentration of 0.5 wt %;

[0034] Step 3: ...

Embodiment 2

[0037] A preparation method of a lithium ion battery positive electrode coated with a gel polymer of the present invention, comprising the steps of:

[0038] Step 1: Weigh 9.6g LiCoO 2 After the positive electrode active material, 0.2g conductive agent, and 0.2g binder polyvinylidene fluoride (PVDF) are mixed evenly, they are added to the organic solvent N-methylpyrrolidone (NMP) and stirred repeatedly until uniform to obtain the positive electrode slurry; The positive electrode slurry is coated on a 20 μm thick current collector aluminum foil, and placed in a vacuum drying oven at 110 ° C for 12 hours to obtain the positive electrode sheet;

[0039] Step 2: Add 1.6g of tris(2-acryloyloxyethyl)phosphate (TAEP) to 200g of acetone solution, followed by 1.3mg of 2-methyl-2-hydroxy-1-phenylacetone (HMPP) Initiator, mixed evenly to obtain a TAEP solution with a concentration of 0.8wt%;

[0040] Step 3: Place the positive pole piece prepared in step 1 in the 0.8wt% tris(2-acryloyl...

Embodiment 3

[0043] A preparation method of a lithium ion battery positive electrode coated with a gel polymer of the present invention, comprising the steps of:

[0044] Step 1: Weigh 9.5g Li 1.2 (Mn 0.56 Ni 0.16 co 0.08 )O 2 (The expression can also be written as 0.6Li[Li 1 / 3 mn 2 / 3 ]O 2 0.4Li[Ni 0.4 mn 0.4 co 0.2 ]O 2 ) after the positive electrode active material, 0.3g conductive agent, and 0.2g binder polyvinylidene fluoride (PVDF) are mixed evenly, after adding in the organic solvent N-methylpyrrolidone (NMP), stir repeatedly until uniform, and obtain the positive electrode slurry; then Coat the positive electrode slurry on a current collector aluminum foil with a thickness of 20 μm, place it in a vacuum oven and dry it at 100°C for 12 hours to obtain the positive electrode sheet;

[0045] Step 2: Prepare tris(2-acryloyloxyethyl) phosphate (TAEP) solution: first add 2.0g tris(2-acryloyloxyethyl)phosphate (TAEP) to 200g acetone solution, then add 2.4 mg 2-methyl-2-hydroxyl...

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Abstract

A gel polymer coated lithium ion battery positive electrode and a preparation method therefor are disclosed. The lithium ion battery positive electrode comprises a positive electrode current collector, and a positive electrode active layer formed by a positive electrode active material, a conductive agent and a binder; the surface of the positive electrode active layer is coated by a layer of tri(di-acryloxyethyl) polyphosphoester gel polymer. The preparation method comprises the steps of mixing the positive electrode active material, the conductive agent and the binder firstly, taking N-methyl pyrrolidone as a solvent, uniformly stirring and coating on aluminum foils, and drying to obtain a positive plate A; placing the positive plate A into an acetone solution containing tri(di-acryloxyethyl) phosphate monomer and photoinitiator, and after fully volatizing the acetone solution, and obtaining a positive plate B; and exposing the positive plate B in ultraviolet light to obtain the lithium ion battery positive electrode. The lithium ion battery positive electrode of the invention is excellent in cycle performance and thermodynamic stability under higher cut-off voltage.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery positive electrode and a preparation method thereof. Background technique [0002] Due to the advantages of high energy density, light weight, no memory effect, and long cycle life, lithium-ion batteries have been widely used in electronic products such as mobile phones, mobile phones, cameras, and notebook computers, and are considered to be the next generation of power vehicles, hybrids, etc. Therefore, it is urgent to develop lithium-ion batteries with high energy density, high power density and high safety. [0003] By properly increasing the charging cut-off voltage of the battery (from the traditional 4.2V to 4.5 / 4.6V), the energy and power density of the battery can be effectively improved to meet the high requirements of the power battery market. However, in practical applications, when the positive electrode of a lithium-ion battery is at a hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/62H01M4/1391
CPCH01M4/131H01M4/1391H01M4/628Y02E60/10
Inventor 李艳蔡振勇石慧谭欣欣李旭
Owner HUNAN SHANSHAN NEW ENERGY CO LTD
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