Prelithiated film and preparation method and application thereof

A technology of pre-lithiation and base film, which is applied in the direction of electrode manufacturing, lithium storage battery, pre-treatment surface, etc., can solve the problems of reducing the use of positive electrode materials, reducing the reversible capacity of batteries, and comparing environmental requirements, so as to achieve low environmental requirements and easy The effect of large-scale production and abundant raw materials

Inactive Publication Date: 2018-09-21
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the pre-lithiation technology mainly includes negative electrode pre-lithiation, positive electrode pre-lithiation, etc. The negative electrode pre-lithiation often uses metal lithium or lithiated materials with strong reducibility as the lithium source, and the environmental requirements in the process of preparation and use are relatively, and very dangerous
The positive electrode pre-lithiation is often to coat the lithiated material directly with the positive electrode material, which reduces the amount of positive electrode material used, thus reducing the reversible capacity of the battery.

Method used

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  • Prelithiated film and preparation method and application thereof
  • Prelithiated film and preparation method and application thereof
  • Prelithiated film and preparation method and application thereof

Examples

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preparation example Construction

[0060] The preparation method of the pre-lithiated film provided in this embodiment, its steps are as follows figure 2 shown, including:

[0061] Step 210, adding the dispersant, binder, conductive additive, auxiliary agent and solvent into the pre-mixing tank according to the required ratio, and completely dissolving to obtain the first mixture;

[0062] The solvent is a polar solvent, including deionized water, N-methylpyrrolidone NMP, alcohol or dimethylformamide DMF; the binder is polyvinylidene fluoride, styrene-butadiene latex, styrene-acrylic latex, polyvinyl alcohol, Ethylene-vinyl acetate, sodium alginate, polyacrylamide, polymethyl methacrylate-butyl acrylate, ethylene-vinyl acetate copolymer, polyvinyl acetate, polyurethane, hydroxyethyl cellulose, methyl hydroxyethyl cellulose One or more mixtures of element, sodium carboxymethyl cellulose, polyacrylamide, polyethylene oxide and polytetrafluoroethylene; the conductive additive is carbon black, conductive graphite...

Embodiment 1

[0076]This embodiment provides a pre-lithiated film, which includes a base film and a pre-lithiated layer composed of a lithiated slurry coated on one side of the base film, wherein the base film is a polypropylene porous film with a thickness of 16um. In the surface coating method, the coating thickness is 2um to form a pre-lithiated layer. The coating slurry is according to the mass ratio: lithiated composition 20%, NMP 80%; wherein, the preparation of the lithiated composition is according to the mass ratio: lithiated material Li 2 CuO 2 The powder is 50%, the particle size D50 is 1um, and the binder PVDF is 50%.

[0077] The pre-lithiated film in this embodiment is prepared by the following method, which specifically includes steps:

[0078] (1) Add the binder PVDF and deionized water into the pre-mixing tank according to the above ratio, and dissolve completely to obtain the mixture I;

[0079] (2) Lithiated material Li 2 CuO 2 The powder is gradually added to the mi...

Embodiment 2

[0085] This embodiment provides a pre-lithiated film, which includes a base film and a pre-lithiated layer composed of a lithiated slurry coated on one side of the base film, wherein the base film is a polypropylene porous film with a thickness of 16um. Surface coating method, the coating thickness is 10um to form a pre-lithiated layer. The coating slurry is according to the mass ratio: lithiated composition 20%, NMP 80%; wherein, the preparation of the lithiated composition is according to the mass ratio: lithiated material Li 2 CuO 2 The powder is 50%, the particle size D50 is 1um, and the binder PVDF is 50%.

[0086] The method for preparing the pre-lithiated film is the same as that in Example 1.

[0087] The pre-lithiated film provided in this example, the positive electrode sheet coated with lithium cobaltate positive electrode material, metal lithium, and electrolyte were assembled into a half-cell, and the battery performance test was carried out. The results are sho...

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Abstract

The invention discloses a prelithiated film and a preparation method and application thereof. The prelithiated film comprises 1um-50um of base film body and 0.02um-100um of prelithated layer coated onthe base film body; the prelithated layer comprises, by weight, 1wt%-99.99wt% of prelithiated material, 0wt%-98.99wt% of coating material, 0.01wt%-10wt% of binder, 0wt%-10wt% of conductive additive material, 0wt%-2wt% of dispersing agent and 0wt%-2wt% of assistant; the prelithiated material is the material capable of releasing lithium ions by an electrochemical reaction under voltage control; theprelithiated material especially comprises LixM1yOz, LixM2y (PO4)z, LixM2y (SiO4)z, Li2S and LixM1ySz; x, y and z are integers or non-integers and meet the balance of electrovalence of chemical formula; M1 is a combination or more of a metallic element, a transition metal element, a rare earth element, an alkali metal, an I VA group element; M2 is a combination or more of the metal element, the transition metal element, the rare earth element, the alkali metal, the I VA group element.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a pre-lithiated film and its preparation method and application. Background technique [0002] Lithium-ion batteries have been successfully used as the main energy storage device in the field of mobile power because of their high output voltage, high energy density, long cycle life, good safety performance, and no memory effect. In order to further meet the needs of grid energy storage, electric vehicles, and consumer electronics for energy storage devices, electrode materials with longer cycle life, better safety, and higher energy density and lithium battery systems have become research hotspots. [0003] During the working process of a lithium battery, lithium ions shuttle between the positive and negative electrodes. The energy density of lithium batteries largely depends on the amount of active lithium ions in the battery. However, in the current commerci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139
CPCH01M4/13H01M4/139Y02E60/10B05D3/144H01M10/446H01M10/052H01M50/414H01M50/434C08K2003/2203C09D127/16C08K2003/2248C08K2201/001C09D5/24C09D7/61C08K3/22H01M4/62H01M10/4235H01M4/0404H01M4/0447H01M4/0459C09D7/67C09D7/68C09D7/70B05D2506/10H01M4/1391H01M4/366H01M4/525H01M4/623H01M10/0525
Inventor 闫昭罗飞李泓
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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