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Lithium ion battery negative plate as well as preparation method and application thereof and lithium ion battery

A lithium-ion battery and negative electrode technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as inability to achieve uniform lithium replenishment, negative electrode sheet lithium separation, deformation, etc., to improve chemical stability and lithium replenishment capacity Precise, the effect of improving safety performance

Active Publication Date: 2016-08-31
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 plate as well as preparation method and application thereof and lithium ion battery
  • Lithium ion battery negative plate as well as preparation method and application thereof and lithium ion battery
  • Lithium ion battery negative plate as well as preparation method and application thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Lithium ion battery negative plate, its preparation method comprises the following steps:

[0034] 1) Preparation of lithium-containing coatings

[0035] In a glove box under an argon atmosphere, 10 g of polypropylene carbonate (molecular weight: 50,000) was dissolved in 100 g of ethyl methyl carbonate (EMC), and stirred at 20 rpm for 15 min to obtain solution A; 2 g of phenyl Add lithium powder into solution A, stir at 10 rpm for 30 minutes, and filter; take the filter residue, wash it with deionized water, and then dry the filter residue at 70°C under the protection of argon at 70°C to obtain 12g of lithium-containing coating;

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

[0037] Add 10g of lithium-containing coating and 1g of sodium dodecylbenzenesulfonate into 100g of chloroform solvent, and mix well to obtain a spraying solution; use electrospinning technology (voltage 20kV, spraying speed 0.02mm / s) to spray The solution is evenly spray...

Embodiment 2

[0040] Lithium ion battery negative plate, its preparation method comprises the following steps:

[0041] 1) Preparation of lithium-containing coatings

[0042] In a glove box with an argon atmosphere, 8 g of polymethyl methacrylate (molecular weight: 100,000) was dissolved in 100 g of ethyl methyl carbonate (EMC), and stirred at 20 rpm for 15 min to obtain solution A; Add butyl lithium powder into solution A, stir at 10 rpm for 30 minutes, and filter; take the filter residue, wash it with deionized water, and then spray dry the filter residue at 70°C under the protection of argon at 70°C to obtain lithium-coated 9g;

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

[0044]Add 5g of the lithium-containing coating and 0.5g of sodium dodecylbenzenesulfonate into 100g of carbon tetrachloride solvent, mix well to obtain a spraying solution; adopt electrospinning technology (voltage 10kV, spraying speed 0.03mm / s) Spray the spray liquid evenly on the surfa...

Embodiment 3

[0047] Lithium ion battery negative plate, its preparation method comprises the following steps:

[0048] 1) Preparation of lithium-containing coatings

[0049] In a glove box under an argon atmosphere, 15 g of polymethylsiloxane (molecular weight: 100,000) was dissolved in 100 g of ethyl methyl carbonate (EMC), and stirred at 20 rpm for 15 min to obtain solution A; Add lithium ethyl borohydride powder into solution A, stir at 10 rpm for 30 minutes, and filter; take the filter residue, wash it with deionized water, and then spray-dry the filter residue at 70°C under the protection of argon at 70°C to obtain lithium-containing Covering 25g;

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

[0051] Add 20g of lithium-containing coating and 2g of sodium dodecylbenzenesulfonate into 100g of toluene solvent, and mix well to obtain a spraying solution; use electrospinning technology (voltage 30kV, spraying speed 0.01mm / s) to spray The solution was uniformly...

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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, and also relates to 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, and the use 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 a lithium-ion battery, due to the formation of a solid electrolyte film (SEI film) on the surface of the negative electrode sheet, part of the lithium migrated from the positive electrode she...

Claims

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Application Information

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Patent Type & Authority Applications(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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