Method for preparing lithium battery silicon carbon anode material

A negative electrode material, lithium battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems that cannot meet the needs, the effect is not very significant, and the effect is not very ideal, so as to avoid powdering and falling off, and reduce the first irreversible The effect of capacity and particle size reduction

Inactive Publication Date: 2013-04-03
TIANJIN B&M SCI & TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicon compounding can introduce a buffer medium to slow down the volume effect of silicon to a certain extent and improve the cycle performance of silicon negative electrodes, but the effect is still not very satisfactory and cannot meet the demand
Other researchers started from the electrode structure and binder, and improved the cycle performance of silicon negative electrodes by changing the electrode structure and binder, but the results were not very significant.

Method used

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  • Method for preparing lithium battery silicon carbon anode material
  • Method for preparing lithium battery silicon carbon anode material
  • Method for preparing lithium battery silicon carbon anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 5g of silicon powder with a particle size of 20 μm into the ball milling tank, carry out wet ball milling with absolute ethanol as the medium, and ball mill for 15 hours, then add 5g of natural graphite, continue ball milling for 2 hours and keep the ball-to-material ratio constant, and place the obtained material in Dry in a drying oven with the temperature set at 80°C until the solvent evaporates completely, grind and pass through a 200-mesh sieve to obtain the active material silicon-carbon composite material.

[0026] Dissolve 0.3g of sodium alginate in 7.5ml of deionized water, and add silicon-carbon composite material and acetylene black according to the ratio of active substance: acetylene black: sodium alginate = 75:10:15, stir for 2 hours, coat, then place Dry it in a drying oven at 80°C for 2 hours, then transfer it to a vacuum drying oven and dry it at 120°C for 12 hours to obtain a silicon-carbon composite material. The electron microscope photo is shown ...

Embodiment 2

[0029] Add 6g of silicon powder with a particle size of 10 μm into a ball mill tank, use deionized water as a medium to carry out wet ball milling, ball mill for 7 hours, then add 4g of natural graphite, continue ball milling for 5 hours and keep the ball-to-material ratio constant, and place the obtained material in a Dry it in a drying oven with the temperature set at 80°C until the solvent evaporates completely, grind it finely and set it aside.

[0030] Dissolve 0.3g of sodium alginate in 7.5ml of deionized water, and add silicon-carbon composite material and acetylene black according to the ratio of active substance: conductive agent: sodium alginate = 70:10:20, stir for 2 hours, coat, and then place Dry in a drying oven at 80°C for 2h, then transfer to a vacuum drying oven and dry at 120°C for 12h.

[0031] The negative electrode material prepared above is used as the negative electrode, the lithium sheet is used as the counter electrode, the electrolyte is 1mol / L LiPF6 ...

Embodiment 3

[0033] Add 7g of silicon powder with a particle size of 30 μm into a ball milling tank, and carry out wet ball milling with cyclohexane as a medium for 20 hours, then add 3g of natural graphite, continue ball milling for 2 hours and keep the ball-to-material ratio constant, and place the obtained material in a Dry it in a drying oven with the temperature set at 80°C until the solvent evaporates completely, grind it finely and set it aside.

[0034] Dissolve 0.3g of sodium alginate in 7.5ml of deionized water, and add the active substance and conductive agent according to the ratio of active substance: conductive agent: sodium alginate = 75:20:10, stir for 2 hours, apply, and then dry Dry in oven at 80°C for 2h, then transfer to vacuum oven and dry at 120°C for 12h.

[0035]The negative electrode material prepared above is used as the negative electrode, the lithium sheet is used as the counter electrode, the electrolyte is 1mol / L LiPF6 EC / DMC (Vol:Vol=1:1) solution, the separa...

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Abstract

The invention discloses a sodium alginate bonding agent used in a lithium battery silicon carbon anode, particularly discloses a method for preparing a silicon carbon anode material by the bonding agent. The method comprises the steps that: step one, micron-grade silica powder is added into a ball milling tank, and a solvent is added to perform ball milling; step two, natural graphite is added into the industrial silicon powder subjected to the ball milling in the step one to continuously perform the ball milling; step three, substances subjected to the ball milling in the step two are dried, and the dried substances are finely ground; step four, 70-80 parts by weight of the silicon carbon composite material, 5-20 parts by weight of sodium alginate and 5-20 parts by weight of acetylene black are weighed, defined amount of deionized water is added, and the materials are uniformly stirred, then coated on a copper foil and dried to obtain the silicon carbon anode material. The novel bonding agent adopted by the invention can effectively improve the cycling performance of the silicon carbon anode material and prolong the cycling service life of the anode material.

Description

technical field [0001] The invention relates to a negative electrode material of a lithium battery, in particular to a preparation method of a silicon carbon negative electrode of a lithium ion battery. Background technique [0002] Since the commercialization of lithium-ion batteries in 1992, the application range of lithium batteries has gradually expanded. From portable electronic products to military equipment, and then to the utilization of new energy, lithium batteries are everywhere. With the development of science and technology and the aggravation of the energy crisis, people are more interested in lithium batteries with high capacity and high energy density. As an important part of lithium batteries, negative electrode materials have become the focus of research in various countries. The traditional negative electrode of lithium battery is carbon material, the theoretical specific capacity is 372mAh / g, the lithium storage capacity is low, and the lithium intercalat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62
CPCY02E60/10
Inventor 王志远陈勃涛徐宁吴孟涛
Owner TIANJIN B&M SCI & TECH
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