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Method for preparing lithium ion battery

A lithium-ion battery and lithium chip technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, and final product manufacturing, etc., can solve the problems affecting the actual performance of batteries, harsh experimental conditions, difficult operation and control, etc., and reduce irreversible capacity loss. , the method is simple, the effect of easy operation

Inactive Publication Date: 2012-07-25
NINGDE AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Through pre-formation, let the negative electrode form the SEI film first, and then assemble it into a fresh full battery. Although it is theoretically feasible, the requirements for the experimental conditions are very strict, and in the process of disassembly and assembly, the original SEI film is in a sub- Steady state, even unstable state, will cause the composition to change, affecting the actual performance of the battery
Lithium metal powder dispersed on the surface, because the powdery lithium metal is very active, it is easy to form a passivation film on the surface during the preparation process, which affects its performance
In addition, the lithium powder coated on the surface has a relatively large contact resistance with the negative electrode sheet, and it is difficult to operate and control, which brings great challenges to the actual production and processing.

Method used

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  • Method for preparing lithium ion battery
  • Method for preparing lithium ion battery
  • Method for preparing lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Add graphite, conductive carbon, sodium carboxymethyl cellulose, and styrene-butadiene rubber into the solvent water according to the mass ratio of 94.5:1.5:1.5:2.5, mix and stir evenly to make a stable slurry, and then use metal copper foil as the current collector. The slurry is coated on the copper current collector to form a film. A negative electrode sheet with a diameter of about 20.3 mm was prepared with a die-cutting cutter.

[0045] Add lithium cobaltate, conductive carbon, and polyvinylidene fluoride into the solvent N-methylpyrrolidone (NMP) according to the mass ratio of 95.5:2.2:2.3, mix and stir evenly to make a stable slurry, and then use metal aluminum foil as a current collector, The slurry was coated on an aluminum current collector. A positive electrode sheet with a diameter of about 14.3 mm was prepared with a die-cutting tool

[0046] LiPF 6 Dissolved in a mixed solvent containing ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl ...

Embodiment 2

[0052] Add Si alloy material, graphite carbon material, conductive carbon, sodium carboxymethyl cellulose, and styrene-butadiene rubber into solvent water according to the mass ratio of 68:23:3:1.5:3.5:1, mix and stir evenly to make a stable slurry, Then the metal copper foil is used as the current collector, and the slurry is coated on the copper current collector to form a membrane. A negative electrode sheet with a diameter of about 20.3 mm was prepared with a die-cutting cutter.

[0053] Add lithium cobaltate, conductive carbon, and adhesive to NMP solvent in a mass ratio of 95.5:2.2:2.3, mix and stir evenly to make a stable slurry, and then use metal aluminum foil as a current collector to coat the slurry on the aluminum collector. fluid on. A positive electrode sheet with a diameter of about 14.3 mm was prepared with a die-cutting cutter.

[0054] LiPF 6 Dissolved in a solvent containing EC, DEC and EMC (the volume ratio of the three is 1:1:1), making LiPF 6 The conc...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a method for preparing a lithium ion battery. The method includes steps: firstly, pressing metal lithium sheets on at least one surface of a cathode sheet and forming a processed cathode sheet; secondly, assembling an anode sheet, a diaphragm and the processed cathode sheet into a cell, packing the cell into a package bag, filling liquid into the package bag, and allowing the packaging bag to stand still so that a solid electrolyte [SEI (solid electrolyte inter-phase)] film is formed on the surface of the cathode sheet; and thirdly, carrying out formation capacity operation and obtaining the lithium ion battery. Compared with the prior art, the method has the advantages that the cathode sheet and the metal lithium sheets are pressed together when the battery is assembled, the SEI film is formed on the surface of an anode material by means of standing and storing before formation of the integral battery while activity of a cathode material and activity of electrolyte are unaffected, the SEI film is formed in advance, irreversible capacity loss of initial charge is effectively reduced, and energy density of the battery is increased.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a preparation method of a lithium-ion battery capable of improving the capacity and efficiency of the first charge and discharge and improving the energy density of the lithium-ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high voltage, low self-discharge and light weight, so they are widely used in various portable mobile electronic devices such as notebook computers, digital cameras, mobile phones, and MP3 players. With the miniaturization and multi-function development of portable mobile electronic devices, people have higher and higher requirements on the energy density of lithium-ion secondary batteries. [0003] Since the lithium-ion battery needs to form a solid electrolyte (SEI) film during the formation process, it consumes the Li provided by the positive electrode. + , which brings...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 袁庆丰
Owner NINGDE AMPEREX TECH
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