Method for preparing silicon-carbon cathode material of lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied to battery electrodes, circuits, electrical components, etc., can solve problems such as volume effect and capacity fading that cannot be fundamentally suppressed, and achieve excellent cycle performance, easy operation, and weakened volume effect Effect

Active Publication Date: 2010-10-06
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above methods can improve the cycle stability of the battery to a certain extent and alleviate the capacity fading of silicon-based negative electrode materials, their mechanisms are simple physical compounding or high-temperature carbon coating, so they cannot fundamentally inhibit the charging and discharging process. Volume effect, after many cycles, the capacity will begin to decay rapidly

Method used

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  • Method for preparing silicon-carbon cathode material of lithium ion battery
  • Method for preparing silicon-carbon cathode material of lithium ion battery
  • Method for preparing silicon-carbon cathode material of lithium ion battery

Examples

Experimental program
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Embodiment 1

[0022] The preparation method of the lithium ion battery silicon carbon negative electrode material of the present embodiment comprises the following steps:

[0023] A: Add 2.20g of catechol, 2ml of formaldehyde and 5ml of concentrated hydrochloric acid into 10ml of ethanol, stir to dissolve completely, and form a phenolic monomer solution;

[0024] B: in the phenolic monomer solution in the A step, add the nano-silicon powder of 0.9g to form a mixed solution;

[0025] C: Put the mixed solution in step B into the reaction kettle, and place the reaction kettle in an ultrasonic cleaner for reaction, set the ultrasonic temperature to 60°C, and the ultrasonic power to 99%. After about 3 hours, the mixed solution is formed After gelling, seal the reactor and put it into the oven. The temperature of the oven is set at 80°C, and the reactor is placed in the oven for 24 hours to generate a blocky precursor;

[0026] D: Crush the precursor produced in step C, and dry it in an oven at ...

Embodiment 2

[0031] The preparation method of the lithium ion battery silicon carbon negative electrode material of the present embodiment comprises the following steps:

[0032] A: Add 1.88g of phenol, 2ml of formaldehyde and 5ml of concentrated hydrochloric acid into 10ml of ethanol, stir to dissolve completely, and form a phenolic monomer solution;

[0033] B: in the phenolic monomer solution in the A step, add the nano-silicon powder of 0.7g to form a mixed solution;

[0034] C: Put the mixed solution in step B into the reaction kettle, and place the reaction kettle in an ultrasonic cleaner for reaction, set the ultrasonic temperature to 75°C, and the ultrasonic power to 99%. After about 1.5 hours, the mixed solution is formed After gelling, seal the reactor and put it into the oven. The temperature of the oven is set to 120°C, and the reactor is placed in the oven for 12 hours to generate a blocky precursor;

[0035] D: Crush the precursor produced in step C, and dry it in an oven at...

Embodiment 3

[0039] The preparation method of the lithium ion battery silicon carbon negative electrode material of the present embodiment comprises the following steps:

[0040] A: Add 2.20g of hydroquinone, 2ml of benzaldehyde and 5ml of concentrated hydrochloric acid into 10ml of ethanol, stir to dissolve completely, and form a phenolic monomer solution;

[0041] B: in the phenolic monomer solution in the A step, add the nano-silicon powder of 1.3g to form a mixed solution;

[0042]C: Put the mixed solution in step B into the reaction kettle, and place the reaction kettle in an ultrasonic cleaner for reaction, set the ultrasonic temperature to 70°C, and the ultrasonic power to 99%. After about 2 hours, the mixed solution is formed After gelling, seal the reactor and put it into the oven. The temperature of the oven is set to 100°C, and the reactor is placed in the oven for 18 hours to generate a blocky precursor;

[0043] D: Grind the precursor produced in step C, and dry it in an oven...

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Abstract

The invention provides a method for preparing a silicon-carbon cathode material of a lithium ion battery. The silicon-carbon cathode material prepared by the method has the advantages of high capacity and good cyclical stability. The preparation method of the invention comprises the following steps of: putting phenol monomers and aldehyde monomers into a solvent to carry out hydrolyzation to synthesize a porous precursor with high specific surface, then adding nano silicon powder into the porous precursor and effectively making the nano silicon powder uniformly dispersed in the synthesized porous precursor with high specific surface by using specific cavatition oscillation of ultrasonic to finally synthesize a porous macromolecular resin-coated silicon precursor with high specific surface so as to make the volume effect greatly weakened and make cycle performance excellent; and then drying the obtained precursor and roasting the dried precursor in protective atmosphere at a specific temperature to finally obtain the silicon-carbon cathode material. The preparation method of the invention has the advantages of simple process, short flow and small equipment investment. The prepared silicon-carbon anode material of the lithium ion battery has uniformly distributed particles and excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a preparation method of a silicon-carbon negative electrode material for a lithium-ion battery. Background technique [0002] At present, the lithium-ion batteries used in production mainly use graphitized carbon as the negative electrode material. The graphite-based negative electrode material has a layered structure and can store a certain amount of lithium ions, but the lithium storage capacity is not high, which determines the low theoretical ratio Capacity (about 372mAh / g) characteristics. Therefore, the development of new high-capacity and high-rate anode materials has high research and application value. [0003] For a long time, lithium alloys have attracted much attention as alternative negative electrode materials. Silicon-based and tin-based materials are due to their high mass specific capacities (theoretical specific capacities of silicon and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02H01M4/38
CPCY02E60/10
Inventor 朱广燕
Owner CHERY AUTOMOBILE CO LTD
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