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Quick-charging type lithium-ion battery and preparation method thereof

A lithium-ion battery and electrolyte technology, which is applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of low charging rate and poor cycle performance, and achieve improved rate charge and discharge performance, low equipment requirements, The effect of simple preparation process

Inactive Publication Date: 2018-08-21
深圳市溢骏科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the current lithium-ion batteries have problems such as low charge rate and poor cycle performance during rate charge and discharge, the invention provides a fast-charge lithium-ion battery and a preparation method thereof

Method used

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  • Quick-charging type lithium-ion battery and preparation method thereof
  • Quick-charging type lithium-ion battery and preparation method thereof
  • Quick-charging type lithium-ion battery and preparation method thereof

Examples

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preparation example Construction

[0057] In one embodiment, the preparation method of the fast-charging lithium-ion battery at least includes the following steps:

[0058] Step S01. Make the positive electrode carbon layer material and the first solvent into the first slurry, and apply the first slurry on the surface of the positive electrode current collector, dry it, and prepare it for use; prepare the negative electrode carbon layer material with the second solvent Form the second slurry, and apply the second slurry on the surface of the negative electrode current collector, dry it, and set it aside;

[0059] Step S02. The material of the positive electrode material layer and the third solvent are made into a positive electrode slurry, and coated on the surface of the positive electrode current collector obtained in step S01, and dried, rolled, and cut to obtain a positive electrode sheet; the negative electrode material layer The material and the fourth solvent are used to make negative electrode slurry, a...

Embodiment 1

[0078] A fast charging type lithium ion battery and preparation method thereof, wherein, the parameters of the fast charging type lithium ion battery are as follows:

[0079] The positive active material is LiNi 0.5 co 0.2 mn 0.3 o 2 , D50 is 5μm, specific surface area ≥ 0.83m 2 / g, the surface coating accounted for 0.3% Al of the positive electrode active material mass percentage 2 o 3 , the positive electrode conductive agent is a mixture of conductive carbon black, carbon nanotubes, and graphene grown by chemical vapor deposition, wherein the number of layers of graphene is ≤ 5 layers, and, according to the mass ratio, it is conductive carbon black: carbon nanotubes : graphene=1:1:0.15. The positive current collector is aluminum foil, and the surface of the aluminum foil is coated with a layer of conductive carbon black layer, and the thickness of the conductive carbon black layer is 1.0 μm.

[0080] Negative electrode active material is artificial graphite, D50 is 8...

Embodiment 2

[0094] A fast charging type lithium ion battery and preparation method thereof, wherein, the parameters of the fast charging type lithium ion battery are as follows:

[0095] The positive electrode active material is lithium iron phosphate, D50 is 1μm, and the average specific surface area is ≥20.3m 2 / g, the surface is coated with a carbon layer that accounts for 1.5% of the mass percentage of the positive active material, and the positive conductive agent is a mixture of conductive carbon black, carbon nanotubes, and graphene grown by chemical vapor deposition, wherein graphene The number of layers is less than or equal to 5 layers, and the mass ratio is conductive carbon black: carbon nanotube: graphene = 1:1:0.3. The positive current collector is aluminum foil, and the surface of the aluminum foil is coated with a layer of conductive carbon black layer, the thickness of the conductive carbon black layer is 1.5 μm.

[0096] The negative electrode active material is a mixtu...

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Abstract

The invention provides a quick-charging type lithium-ion battery and a preparation method. A positive plate of the quick-charging type lithium-ion battery comprises a positive current collector as well as a positive carbon layer and a positive material layer which are stacked; the positive material layer comprises materials including a positive conductive agent, a positive binder and a positive active substance with a coating layer; the mass ratio of components of the positive conductive agent, namely, the mass ratio of conductive carbon black, carbon nanotubes and graphene, is 1: 1: (0.1-0.5), and graphene is prepared with a chemical vapor deposition method and has the layer number smaller than or equal to 5 and size in a range of 300-700 nm; a negative plate comprises a negative currentcollector as well as a negative carbon layer and a negative material layer which are sequentially stacked; the battery is welded in an end surface welding manner. The lithium-ion battery has the capacity of 5,000 mAh or above, has good conductivity and good rate charge-discharge performance, and has the charge rate exceeding 6 C, the cycle life of high-rate charge and discharge reaching 1,500 weeks and the capacity retention rate of 85% or above.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a fast-charging lithium-ion battery and a preparation method thereof. Background technique [0002] Due to the advantages of high working voltage, high energy density, and no memory effect, lithium-ion batteries are widely used in various electronic devices such as digital cameras, mobile phones, tablet computers, and notebook computers, and are constantly developing in the field of new energy vehicles. [0003] In recent years, the development of new energy vehicles is in full swing. In order to promote the healthy development of the new energy vehicle industry and keep it in an advantageous position in global competition, the Chinese government has issued relevant policies to support the development of the domestic new energy vehicle industry chain. On the one hand, it is also actively encouraging all kinds of capital to enter this field. However, com...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525H01M10/058
CPCH01M4/366H01M4/583H01M4/625H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 刘新民
Owner 深圳市溢骏科技有限公司
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