Method for supplementing lithium to lithium ion battery pole piece

A lithium-ion battery and pole piece technology, applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve problems such as unfavorable production efficiency, high energy, and potential safety hazards for operators, and achieve the first coulombic efficiency and cycle performance improvement, Low environmental and equipment requirements, and the effect of reducing capacity loss

Inactive Publication Date: 2017-02-15
DONGGUAN TAFEL NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this application, lithium replenishment is mainly carried out on the positive electrode and the negative electrode by electrification, which will consume more energy, which is not conducive to energy conservation and environmental protection, and this application requires two cycles of lithium replenishment, which is time-consuming and complicated to operate. Conducive to the improvement of production efficiency
[0006] In addition, dry powder addition method can also be used to add lithium powder to the surface of the pole piece to achieve lithium supplementation operation, but because lithium powder is easy to float in the air, it will cause a greater safety hazard to the operator; and directly adding lithium powder is harmful to the environment. and equipment requirements are very high, making the production cost high and difficult to operate

Method used

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  • Method for supplementing lithium to lithium ion battery pole piece

Examples

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Effect test

Embodiment 1

[0037] This embodiment provides a method for replenishing lithium to the positive electrode sheet of a lithium-ion battery, which includes the following steps:

[0038]Step (1), preparing lithium colloidal particles with a core-shell structure, wherein the shell material is polyaniline, and the core layer material is metal lithium, with a mass ratio of 1:50; in a nitrogen atmosphere, add polyaniline to the reaction vessel and N-methylpyrrolidone, the mass ratio is 1:3, the temperature is controlled below 60°C, and the polyaniline is fully dissolved with sufficient stirring; then the dried metal lithium powder is added, and the particle size is 100nm, and fully stirred Fully disperse the metal lithium powder until a uniform dispersion solution is formed, bake at a temperature of 100°C for 8 hours to remove the solvent, and obtain polyaniline-coated lithium colloidal particles of metal lithium;

[0039] Step (2), lithium colloidal particles prepared in step (1), positive active ...

Embodiment 2

[0041] This embodiment provides a method for replenishing lithium to the positive electrode sheet of a lithium-ion battery, which includes the following steps:

[0042] Step (1), preparing lithium colloidal particles with a core-shell structure, wherein the shell material is styrene-butadiene rubber, and the core layer material is metal lithium, with a mass ratio of 1:99; in an argon atmosphere, add Styrene-butadiene rubber and N-methylpyrrolidone, the mass ratio is 1:5, the temperature is controlled below 60°C, and the styrene-butadiene rubber is fully dissolved by stirring thoroughly; then the dried metal lithium powder is added, and the particle size is 0.1nm, fully stirred to disperse the metal lithium powder until a uniform dispersion solution is formed, baked at 120°C for 12 hours to remove the solvent, and obtained lithium colloidal particles of styrene-butadiene rubber-coated lithium metal;

[0043] Step (2), lithium colloidal particles prepared in step (1), positive a...

Embodiment 3

[0045] This embodiment provides a method for replenishing lithium to the positive electrode sheet of a lithium-ion battery, which includes the following steps:

[0046] Step (1), preparing lithium colloidal particles with a core-shell structure, wherein the shell material is polypyrrole, the core layer material is metal lithium, and its mass ratio is 1:80; in a nitrogen atmosphere, add polypyrrole to the reaction vessel and tetrahydrofuran, the mass ratio is 1:5, the temperature is controlled below 60 ° C, and the polypyrrole is fully dissolved by stirring; then the dried metal lithium powder is added, and the particle size is 0.1nm, and the metal lithium is fully stirred. The powder is fully dispersed until a uniform dispersion solution is formed, and the solvent is removed by baking at 120°C for 12 hours to obtain lithium colloidal particles of polypyrrole-coated lithium metal;

[0047] Step (2), dispersing the lithium colloidal particles prepared in step (1) in N-methylpyrr...

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Abstract

The invention belongs to the technical field of lithium ion batteries and particularly relates to a method for supplementing lithium to a lithium ion battery pole piece. The method includes the following steps that 1, lithium colloidal particles of core-shell structures are prepared, shell layers are made of rubber and/or resin, core layers are made of metal lithium, and metal lithium is coated with the shell layer materials to form the lithium colloidal particles; 2, the lithium colloidal particles obtained in the step 1 and an electrode active material are mixed to prepared into electrode active slurry, then the surface of a current collector is evenly coated with the mixed electrode active slurry, and drying is carried out. The lithium colloidal particles of the core-shell structures are used for the battery pole piece to prepare a lithium-rich battery pole piece. The method for supplementing lithium to the lithium ion battery pole piece is easy to operate, safe and efficient, the risk that metal lithium is oxidized is avoided, the requirements for the environment and equipment are low, the production cost can be reduced, meanwhile, the first-time coulombic efficiency and cycle performance of a lithium ion battery adopting the battery pole piece are both obviously improved, and battery capacity losses caused by irreversible cycle are greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a method for supplementing lithium to pole pieces of lithium ion batteries. Background technique [0002] Lithium-ion batteries have become one of the most widely used secondary batteries due to their advantages of high voltage, high energy density and long cycle life. However, with the miniaturization of portable electronic devices and the continuous development of long standby time, as well as the use of high-power and high-energy devices such as electric bicycles and electric vehicles, the energy density of lithium-ion batteries as energy storage power sources has been increasingly raised. high demands. [0003] During the first charging process of the battery, due to the formation of the solid electrolyte film (SEI film) on the surface of the negative electrode sheet, part of the lithium migrated from the positive electrode sheet will be consumed, resulting in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/04H01M10/0525
CPCH01M4/0404H01M4/139H01M10/0525Y02E60/10
Inventor 江柯成徐大伟谭少希邹立卢国讲
Owner DONGGUAN TAFEL NEW ENERGY TECH CO LTD
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