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Lithium-ion battery negative electrode sheet, preparation method and application, lithium-ion battery

A technology for lithium ion batteries and negative electrode sheets, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of inability to achieve uniform lithium supplementation, lithium deposition of negative electrode sheets, deformation, etc., to improve chemical stability and lithium supplementation. Accurate and improved safety performance

Active Publication Date: 2018-11-30
LUOYANG LIRONG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, spraying or dripping the organic lithium solution on the surface of the negative electrode sheet cannot achieve uniform lithium replenishment, and accurate and controllable operation of the amount of lithium replenishment, which may easily cause lithium separation or deformation of the negative electrode sheet.

Method used

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  • Lithium-ion battery negative electrode sheet, preparation method and application, lithium-ion battery
  • Lithium-ion battery negative electrode sheet, preparation method and application, lithium-ion battery
  • Lithium-ion battery negative electrode sheet, preparation method and application, lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A lithium ion battery negative electrode sheet, the preparation method thereof comprises the following steps:

[0034] 1) Preparation of lithium-containing coating

[0035] In a glove box under an argon atmosphere, 10 g of polypropylene carbonate (molecular weight 50,000) weighed was dissolved in 100 g of ethyl methyl carbonate (EMC), and stirred for 15 min at 20 rpm to obtain solution A; 2 g of phenyl Lithium powder was added to solution A, stirred at 10 rpm for 30 min, and filtered; the filter residue was taken, washed with deionized water, and then the filter residue was dried at 70°C under argon protection at 70°C to obtain 12 g of lithium-containing coating;

[0036] 2) Preparation of negative electrode sheet for lithium battery

[0037] 10g of lithium-containing coating and 1g of sodium dodecylbenzenesulfonate that were weighed were added to 100g of chloroform solvent, and the mixture was uniformly mixed to obtain a spray solution; the electrospinning technology ...

Embodiment 2

[0040] A lithium ion battery negative electrode sheet, the preparation method thereof comprises the following steps:

[0041] 1) Preparation of lithium-containing coating

[0042] In a glove box under an argon atmosphere, 8 g of polymethyl methacrylate (molecular weight: 100,000) was weighed and dissolved in 100 g of ethyl methyl carbonate (EMC), and stirred for 15 min at 20 rpm to obtain solution A; Butyllithium powder was added to solution A, stirred at 10 rpm for 30 min, and filtered; the filter residue was taken, washed with deionized water, and then the filter residue was spray-dried at 70°C under argon protection at 70°C to obtain a lithium-containing coating 9g;

[0043] 2) Preparation of negative electrode sheet for lithium battery

[0044]The 5g lithium-containing coating and 0.5g sodium dodecylbenzene sulfonate that were weighed were added to 100g carbon tetrachloride solvent, and the mixture was uniformly mixed to obtain a spray solution; Electrospinning technolog...

Embodiment 3

[0047] A lithium ion battery negative electrode sheet, the preparation method thereof comprises the following steps:

[0048] 1) Preparation of lithium-containing coating

[0049] In a glove box in an argon atmosphere, 15g of polymethylsiloxane (molecular weight: 100,000) was weighed and dissolved in 100g of ethyl methyl carbonate (EMC), and stirred at 20rpm for 15min to obtain solution A; Lithium ethyl borohydride powder was added to solution A, stirred at 10 rpm for 30 min, and filtered; the filter residue was taken, washed with deionized water, and then the filter residue was spray-dried at 70 ° C under argon protection at 70 ° C to obtain lithium-containing Coating 25g;

[0050] 2) Preparation of negative electrode sheet for lithium battery

[0051] 20g of lithium-containing coating and 2g of sodium dodecylbenzenesulfonate were added into 100g of toluene solvent, and mixed to obtain a spray solution; the electrospinning technology (voltage 30kV, spray speed 0.01mm / s) was...

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Abstract

The invention discloses a lithium ion battery negative plate as well as a preparation method application thereof and a lithium ion battery, and belongs to the technical field of secondary lithium batteries. The negative plate is prepared in a method comprising the following steps of: in an inert atmosphere, uniformly distributing a solution containing a lithium compound onto the surface of the negative plate by adopting an electrostatic spinning technology, and drying. Lithium is supplemented on the surface of the negative plate in a wet method by adopting the electrostatic spinning technology, so that the lithium-containing compound is uniformly distributed on the surface of the negative plate to form a fibrous lithium strip with a relatively large specific surface area and a porous structure; compared with the existing lithium supplementing method in a spraying or dropwise adding manner, the lithium can be uniformly supplemented, a beneficial effect of precisely and controllably supplementing the lithium can be achieved, and lithium precipitation or deformation of the negative plate is effectively avoided.

Description

technical field [0001] The invention relates to a negative electrode sheet of a lithium ion battery, a preparation method and application of the negative electrode sheet, and a lithium ion battery, belonging to the technical field of lithium secondary batteries. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high energy density, and long cycle life, and are widely used secondary batteries. However, with the development of miniaturization and long standby time of portable electronic devices, as well as the activation of high-power and high-energy devices such as electric vehicles and energy storage components, higher and higher requirements are placed on the performance of lithium-ion batteries. [0003] During the first charging process of the lithium-ion battery, the solid electrolyte film (SEI film) formed on the surface of the negative electrode consumes part of the lithium migrated from the positive electrode, resulting in the lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01M10/0525H01M4/583
CPCH01M4/139H01M4/366H01M4/583H01M10/0525Y02E60/10
Inventor 李志王燕
Owner LUOYANG LIRONG NEW ENERGY TECH
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