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Fast charging 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 poor cycle performance and low charging rate, achieve low equipment requirements, improve rate charge and discharge performance, and good Effect of Conductive Properties

Inactive Publication Date: 2019-08-16
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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  • Fast charging lithium ion battery and preparation method thereof
  • Fast charging lithium ion battery and preparation method thereof
  • Fast charging lithium ion battery and preparation method thereof

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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 a first slurry with the positive electrode carbon layer material and the first solvent, and coat the first slurry on the surface of the positive electrode current collector, dry, and set aside for use; prepare the negative electrode carbon layer material with the second solvent. forming a second slurry, and coating the second slurry on the surface of the negative electrode current collector, drying, and waiting for use;

[0059] Step S02. Make the material of the positive electrode material layer and the third solvent into a positive electrode slurry, and coat it on the surface of the positive electrode current collector obtained in step S01. After drying, rolling and cutting, a positive electrode sheet is obtained; the negative electrode material layer is The material and the fourth solvent are used to make a negative electro...

Embodiment 1

[0078] A fast-charging lithium-ion battery and a preparation method thereof, wherein the parameters of the fast-charging 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 accounts for 0.3% of the positive active material mass percentage of Al 2 O 3 , the positive electrode conductive agent is a mixture of conductive carbon black, carbon nanotubes, and graphene obtained by chemical vapor deposition growth, wherein, the number of layers of graphene≤5 layers, and, according to the mass ratio, it is conductive carbon black: carbon nanotubes : Graphene = 1:1:0.15. The positive electrode current collector is an aluminum foil, and the surface of the aluminum foil is coated and laminated with a layer of conductive carbon black layer, and the thickness of the conductive carbon black layer is 1.0 μm.

[0080] The negative active material is artificial graphi...

Embodiment 2

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

[0095] The positive active material is lithium iron phosphate, D50 is 1μm, and the average specific surface area is ≥20.3m 2 / g, the surface is covered 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. Among them, 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 electrode current collector is an aluminum foil, and the surface of the aluminum foil is coated and laminated with a conductive carbon black layer, and the thickness of the conductive carbon black layer is 1.5 μm.

[0096] The negative active material is a mixture o...

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Abstract

The invention provides a fast-charging lithium-ion battery and a preparation method thereof. The positive electrode sheet of the fast charging type lithium ion battery includes a positive electrode current collector, a positive electrode carbon layer and a positive electrode material layer stacked on top of each other; the material of the positive electrode material layer includes a positive electrode conductive agent, a positive electrode binder, and a positive electrode active material with a coating layer. ; Each component of the positive electrode conductive agent is conductive carbon black in mass ratio: carbon nanotube: graphene = 1: 1: (0.1~0.5), graphene is prepared by chemical vapor deposition and the number of layers is ≤5, and the size is 300~ 700nm; the negative electrode sheet includes the negative electrode current collector, the negative electrode carbon layer and the negative electrode material layer stacked in sequence; the battery is welded by end welding. The lithium-ion battery of the present invention has a capacity of 5000mAh and above, has good electrical conductivity, and simultaneously exhibits good rate charge and discharge performance. The charge rate can exceed 6C, and the cycle life of high rate charge and discharge reaches 1500 cycles. The capacity retention rate is 85%. and above.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and particularly relates to a fast-charging lithium ion battery and a preparation method thereof. Background technique [0002] Due to the advantages of high operating 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 has been in full swing. In order to promote the healthy development of the new energy vehicle industry and make it a dominant position in the global competition, the Chinese government has issued relevant policies to support the development of the domestic new energy vehicle industry chain, on the other hand. On the one hand, it is also actively encouraging all kinds of capital to enter thi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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