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A kind of fast charging type lithium ion battery and preparation method thereof

A lithium-ion battery and electrolyte technology, applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve problems such as poor battery cycleability, and achieve the effects of long cycle life, stable performance, and improved bonding strength.

Active Publication Date: 2021-08-06
东莞赣锋电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cycle of the battery is poor, and it can be used for about 300 times.

Method used

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  • A kind of fast charging type lithium ion battery and preparation method thereof
  • A kind of fast charging type lithium ion battery and preparation method thereof
  • A kind of fast charging type lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A fast charging type lithium-ion battery comprises a positive electrode sheet, a negative electrode sheet, a diaphragm and an electrolyte; the positive electrode sheet includes a positive electrode current collector and a positive electrode material layer, and the material of the positive electrode material layer includes a positive electrode active material, a positive electrode conductive agent, a positive electrode adhesive binder; the negative electrode sheet includes a negative electrode current collector and a negative electrode material layer, and the material of the negative electrode material layer includes a negative electrode active material, a negative electrode conductive agent, and a negative electrode binder.

[0047] The positive electrode active material is lithium cobalt oxide, the positive electrode conductive agent is conductive carbon black and carbon nanotube, and the positive electrode binder is polyvinylidene fluoride. The mass parts of each subst...

Embodiment 2

[0052] The fast-charging lithium-ion battery of this embodiment has the same structure as that of Embodiment 1. The difference is that the positive electrode conductive agent is graphene, and the mass parts of each substance added in the positive electrode material layer are 96.2 parts of lithium cobaltate, 0.6 parts of graphene, and 0.8 parts of polyvinylidene fluoride.

[0053] The negative electrode active material adopts 4.5wt% soft carbon-coated graphite, the negative electrode conductive agent is carbon nanotubes, and the mass parts of each substance in the negative electrode material layer are 94.5 parts of soft carbon-coated graphite, 1.3 parts of styrene-acrylic emulsion, and carbon nanotubes. Tube 0.4 servings.

[0054] The positive current collector is an aluminum foil with a thickness of 11.5 μm, the negative current collector is a copper foil with a thickness of 7.5 μm, the separator is a base film with ceramic coating and adhesive coating on both sides, and the b...

Embodiment 3

[0057] The fast-charging lithium-ion battery of this embodiment has the same structure as that of Embodiment 2. The difference is that the positive electrode conductive agent is graphene and carbon-doped carbon nanotubes, and the positive electrode binder is polyvinylidene fluoride, PAALi, and aminated enzymatic lignin. The mass parts of each substance added in the positive electrode material layer are 98.5 parts of lithium cobaltate, 0.5 parts of graphene, 0.8 parts of carbon-doped carbon nanotubes, 0.5 parts of polyvinylidene fluoride, 0.2 parts of PAALi, and 0.3 parts of aminated enzymatic lignin share.

[0058] The negative electrode active material is graphite coated with 3wt% soft carbon, the negative electrode conductive agent is carbon nanotube, and the negative electrode binder is styrene-acrylic emulsion, CMC and SBR. The mass parts of each substance added in the negative electrode material layer are 96 parts of soft carbon-coated graphite, 1.2 parts of styrene-acry...

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Abstract

The invention provides a fast-charging lithium-ion battery, wherein the negative electrode active material is graphite coated with soft carbon, the solute of the electrolyte is lithium hexafluorophosphate, and the organic solvent includes ethylene carbonate, propylene carbonate, ethyl propionate and polypropylene. The lithium ion battery of the present invention supports 2C rate cycle, has long cycle life and stable performance, and can be used 900 times under 2C / 1C charge and discharge rate, and the battery capacity can still maintain above 87%.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a fast-charging lithium-ion battery and a preparation method thereof. [0002] Professional terms: SBR refers to styrene-butadiene rubber, CMC refers to hydroxymethyl cellulose, PTFE refers to polytetrafluoroethylene, NMP refers to N-methylpyrrolidone, PAni refers to polyaniline, PAA refers to polyacrylic acid, PAALi refers to lithium polyacrylate, PEAA refers to Polyvinyl acrylic. Background technique [0003] Lithium-ion batteries are widely used in the digital field due to their high average output voltage, high energy density, and no memory effect. With the development of society, people's demand for electronic products is increasing. In the fast-paced life, in addition to battery life and safety performance, the battery can be quickly charged in a short period of time is also a major demand in the market. [0004] Patent No. 201811648697.8 discloses a fast-chargi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/587H01M4/62H01M50/414H01M50/417H01M50/426H01M50/434H01M50/457H01M50/451H01M10/0525H01M10/0569H01M10/058
CPCH01M4/587H01M4/622H01M4/625H01M10/0525H01M10/0569H01M10/058H01M50/411H01M50/431H01M50/449Y02E60/10Y02P70/50
Inventor 白羽戈志敏王乾
Owner 东莞赣锋电子有限公司
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