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Silicon carbone compound negative polar material of lithium ion battery and its preparation method

A lithium-ion battery, silicon-carbon composite technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of reducing the amount of lithium intercalation, unable to give full play to the high capacity characteristics of Si, hindering lithium diffusion behavior, etc., and achieve improvement. Effects of diffusion behavior, improved first-time efficiency and cycle stability, excellent high-current discharge capability

Active Publication Date: 2007-02-14
BTR NEW MATERIAL GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Graphite-silicon / Si(OCH 3 ) 4 Although the composite material has relatively stable mechanical properties, which is conducive to the improvement of cycle performance, on the other hand, the existence of Si-O network structure also hinders the diffusion behavior of lithium, which reduces the intercalation amount of lithium and cannot fully exert the power of Si. High capacity characteristics (J.Power Sources, 94(2001):63-67)

Method used

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  • Silicon carbone compound negative polar material of lithium ion battery and its preparation method
  • Silicon carbone compound negative polar material of lithium ion battery and its preparation method
  • Silicon carbone compound negative polar material of lithium ion battery and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Embodiment 1, prepare silicon carbon Si-G-C-Li 2 CO 3 Composite negative electrode material: Mechanical high-energy ball milling of silicon powder with a particle size of 75 μm to 0.5 μm in an argon atmosphere to obtain ultra-fine silicon powder; preparation of natural graphite with a particle size of 70 μm and a carbon content of more than 95% by pulverization, classification, shaping and purification Spherical graphite with a carbon content of 99.9% or more and a particle size of 1 μm was obtained; the obtained ultrafine silicon powder 20wt% and 80wt% spherical graphite were mixed and granulated in a double-helix mixer for 6 hours to make a composite particle matrix; the composite particle Mix the matrix with 10wt% phenolic resin and stir for 10 hours, then dry and granulate at 300°C; carbonize the composite material coated with phenolic resin, heat it to 1100°C in an argon atmosphere, keep it warm for 3 hours, and then lower it to room temperature , crushed and disp...

Embodiment 2

[0060] Example 2, preparation of silicon carbon Si-Mg-G-C-LiOH composite negative electrode material: Si-Mg powder with a particle size of 75 μm, containing 50 wt% Si, was mechanically high-energy ball milled to 0.1 μm in an argon atmosphere to obtain ultrafine Si -Mg powder; the natural graphite with a particle size of 70 μm and a carbon content of more than 95% is pulverized, classified, shaped and purified to prepare spherical graphite with a carbon content of more than 99.9% and a particle size of 3 μm; the prepared ultrafine Si-Mg powder 30wt % and 70wt% spherical graphite were mixed in a mixing granulator for 1 hour and granulated to make a composite particle matrix; the composite particle matrix was mixed with 2.5wt% styrene-butadiene rubber emulsion for 4 hours, and then dried and granulated at 200 ° C; The coated composite material is carbonized, heated to 700°C in an argon atmosphere, kept for 5 hours, then lowered to room temperature, crushed and dispersed to 10 μm; ...

Embodiment 3

[0062] Example 3, preparation of silicon carbon Si-Fe-G-C-LiF composite negative electrode material: Si-Fe powder with a particle size of 75 μm, containing 75wt% Si, was mechanically high-energy ball milled to 1 μm in an argon atmosphere to obtain ultrafine Si- Fe powder; the natural graphite with a particle size of 70 μm and a carbon content of more than 95% is pulverized, classified, shaped and purified to prepare spherical graphite with a carbon content of more than 99.9% and a particle size of 5 μm; the prepared ultrafine Si-Fe powder 2wt% and 98wt% spherical graphite were mixed in a mixing granulator for 6 hours to make a composite particle matrix; the composite particle matrix was mixed with 1wt% polyvinyl alcohol solution and stirred for 10 hours by wet method, and then dried and granulated at 200 ° C; the coated The final composite material is carbonized, heated to 1500°C in an argon atmosphere, kept for 1 hour, then lowered to room temperature, crushed and dispersed to...

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Abstract

This invention discloses a silicon carbon compound negative material and its preparation method for Li ionic batteries, which takes silicon and carbon phase compound particles as the base of sphericity or its like covered by a carbon layer. The preparation method includes: crushing the carbon phase particles to be mixed with silicon phase particles and sized to become a compound particle matrix to be covered with the precursor of the organic pyrolyzed carbon then to be carbonized and crushed. Compared with the current technology, this invention takes the compound material of Si and C phase particles as the matrix covered by a compound negative material, in which, the reversible specific volume of which is greater than 450mAh / g, the first circulation coulomb efficiency is greater than 85% and the volume holding rate for 200 times is greater than 80% to greatly reduce the volume effect of the Si activated material when absorbing and discharging Li and improve the diffusion performance of Li in activated materials.

Description

technical field [0001] The invention relates to a battery negative electrode material and a preparation method thereof, in particular to a silicon-carbon composite negative electrode material of a lithium ion battery and a preparation method thereof. Background technique [0002] Since Japan's Sony Corporation took the lead in developing and commercializing lithium-ion batteries in 1990, lithium-ion batteries have developed rapidly. Today lithium-ion batteries have been widely used in various fields of civil and military use. With the continuous advancement of science and technology, people have put forward more and higher requirements for the performance of batteries: the miniaturization and personalized development of electronic equipment requires batteries to have smaller volumes and higher specific energy output; aerospace energy requirements Batteries have cycle life, better low-temperature charge and discharge performance, and higher safety performance; electric vehic...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/04C01B31/00B22F1/02B22F9/00H01M4/02H01M4/58H01M4/583H01M10/0525H01M10/36
CPCH01M4/583H01M2004/021H01M4/364H01M10/0525H01M4/38H01M4/625H01M4/366Y02E60/12H01M4/386Y02E60/10H01M4/04
Inventor 岳敏张万红
Owner BTR NEW MATERIAL GRP CO LTD
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