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Manufacturing method for high capacity composite electrode of lithium ionic cell

A lithium-ion battery and composite electrode technology, applied in battery electrodes, electrode manufacturing, active material electrodes, etc., can solve the problems of increasing the volume density of electrodes and affecting the first reversible performance of the system, so as to improve cycle stability, reduce process costs, The effect of simplifying the process

Inactive Publication Date: 2009-06-17
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, adding more conductive agents to the negative electrode material improves its conductivity on the one hand, and reduces the volume effect in the electrochemical process to a certain extent, but on the other hand, it also increases the volume density of the electrode.
In addition, acetylene black itself has a certain irreversible lithium intercalation capacity, so it will affect the first reversible performance of the system to a certain extent.

Method used

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  • Manufacturing method for high capacity composite electrode of lithium ionic cell
  • Manufacturing method for high capacity composite electrode of lithium ionic cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dissolve asphalt in pyridine evenly, add silicon powder and active graphite powder about 5 microns slowly at a mass ratio of 1:2, stir evenly through magnetic force, heat at 40-60°C to remove organic solvent and place in an oven Dry the sample at about 100°C; the dried mixture is a viscous paste, which is evenly coated on the surface of the foamed nickel, and rolled with a force of 1-2 MPa to fill part of the paste into the pores of the foamed nickel Inside, the precursors for composite electrodes are made. Move this precursor into a sealed quartz tube, and pass in Ar and H 2 Protected by mixed gas, the sealed quartz tube was moved into a heating furnace, and the temperature was slowly raised to 900°C with a heating rate of 15°C / min and a reaction time of 100min. After the reaction, the whole process has been protected by an inert atmosphere. After the reaction, the sample is cooled in a furnace under the protection of an inert gas to become a composite electrode pole...

Embodiment 2

[0022] Dissolve asphalt in tetrahydrofuran evenly, and filter out insoluble blocks; slowly add silicon powder and micron-sized nickel powder with a particle size of less than 100 nanometers into the asphalt solution at a mass ratio of 1:4, stir evenly through magnetic force, and pass through 40 to 60 Heat at ℃ to remove the organic solvent and dry the sample in an oven at 100℃; the dried mixture is a viscous paste, which is evenly coated on the surface of the foamed nickel, and passed through a 1-2MPa force roller Pressing, so that part of the paste is filled into the pores of the nickel foam to make the precursor of the composite electrode. Move this precursor into a sealed quartz tube, and pass in Ar and H 2 Under the protection of mixed gas, the sealed quartz tube was moved into a heating furnace, and the temperature was slowly raised to 800°C with a heating rate of 15°C / min and a reaction time of 100min. After the reaction, the sample is cooled in a furnace under the prot...

Embodiment 3

[0024] Dissolve the asphalt in acetone evenly, and filter out the insoluble block; slowly add silicon powder and reduced iron powder of about 1 micron into the asphalt solution at a mass ratio of 1:4, stir evenly by magnetic force, and heat at 40-60°C. Remove the organic solvent and dry the sample in an oven at 100°C; the dried mixture is a viscous paste, which is evenly coated on the surface of the foamed nickel, and rolled with a force of 1 to 2 MPa to make Part of the paste is filled into the pores of the nickel foam to make the precursor of the composite electrode. Move this precursor into a sealed quartz tube, and pass in Ar and H 2Mixed gas protection, the sealed quartz tube is moved into the heating furnace, and the temperature is slowly raised to about 1000 ° C, the heating rate is 20 ° C / min, and the reaction time is about 100 min. After the reaction, the sample is cooled in a furnace under the protection of an inert gas to become a composite electrode pole piece. ...

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Abstract

The invention belongs to the lithium ion battery field, in particular to a preparing method of a composite electrode capable of being used as a negative electrode of a lithium ion battery, which has high specific capacity, high charging and discharging reversibility and excellent circularity. The composite electrode comprises an electrode active material and a current collector, wherein the electrode active material is a composite material which utilizes carbon with fine interface compatibility as a base, and utilizes silicon, tin or other compounds as active species, and utilizes nickel, copper or graphite and polymer pyrolysis carbon as fillers, the current collector includes current collecting materials such as foamed nickel, foamed copper or carbon cloth which have three-dimensional network structure, certain high temperature resistance property, sound conductivity and can enable electrode active substances to be uniformly distributed inside or on the surfaces, and the composite electrode is prepared by dispersing silicon (tin) / nickel (copper, graphite) compounded in compounding process of the electrode active material through the high temperature solid phase reaction.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a method for preparing a composite electrode which can be used as a negative electrode of a lithium ion battery, has high specific capacity, high reversibility in charge and discharge process, and good cycle performance. Background technique [0002] With the miniaturization of various portable electronic devices and the widespread demand for electric vehicles, the demand and performance requirements for chemical power sources have increased dramatically. At present, lithium transition metal oxide / graphite systems are mostly used in commercial lithium-ion batteries. Due to The limitation of the low theoretical lithium storage capacity of the electrode itself (such as graphite, 372mAh / g) has been difficult to meet the current demand for power sources with high specific energy density. The current research on non-carbon anode materials shows that many materials with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/36H01M4/64H01M4/70H01M4/66H01M4/04H01M4/139
CPCY02E60/12Y02E60/10
Inventor 文钟晟李嵩孙俊才季世军
Owner DALIAN MARITIME UNIVERSITY
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