Preparation method of lithium ion battery silicon-carbon composite cathode material

A technology of lithium ion battery and negative electrode material, applied in the field of electrochemical power supply, can solve the problems of unstable motor cycle performance, easy agglomeration of nano-silicon materials, battery failure, etc.

Inactive Publication Date: 2014-01-15
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the volume of silicon will change drastically during the charging and discharging process, resulting in unstable cycle performance of the motor, resulting in battery failure, and its high initial irreversible capacity limits its application as a negative electrode material for lithium-ion batteries.
[0005] At present, the most widely used method is to optimize and modify nano-silicon materials by doping and coating methods to make this material more stable and improve the cycle performance of batteries to a certain extent. However, the problem of easy agglomeration of nano-silicon materials still remains. can't solve

Method used

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  • Preparation method of lithium ion battery silicon-carbon composite cathode material
  • Preparation method of lithium ion battery silicon-carbon composite cathode material

Examples

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Embodiment 1

[0020] Measure 45ml of tetraethyl orthosilicate and dissolve in 12ml of absolute ethanol, then add 15ml of deionized water, stir evenly to form a transparent solution, add dropwise oxalic acid, adjust the pH value of the solution to 4; add 22.4g of mesophase carbon microspheres (D50 12um), high-speed magnetic stirring at 50°C for 2.5h, slowly adding 10% ammonia water until the gel is complete; dry the gel in an oven at 105°C to obtain a silica / graphite composite material. Put the obtained silica / graphite composite material in a tube furnace, feed a mixture of propylene gas and argon gas (5% vol propylene) at 750°C for 3.5 hours, then change to argon, and raise the temperature to 1100°C , keep warm for 5h, and cool with the furnace to obtain silicon / graphite / amorphous carbon composite negative electrode material. The prepared composite material, acetylene black, and PVdF were made into a slurry according to the mass ratio of 80:10:10, and evenly coated on the copper foil (14um)...

Embodiment 2

[0022] Measure 45ml tetraethyl orthosilicate and dissolve in 12ml absolute ethanol, then add 15ml deionized water, stir well to form a transparent solution, add dropwise oxalic acid, adjust the pH value of the solution to 4; add 13.1g natural graphite (D50 is 8um) , high-speed magnetic stirring at 53°C for 2h, slowly adding 10% ammonia water until the gel was completed; the gel was dried in an oven at 105°C to obtain a silica / graphite composite material. Put the obtained silica / graphite composite material in a tube furnace, feed the mixed gas of propylene and argon (5% propylene) at 750°C for 3.5 hours, then change to argon, and raise the temperature to 1150°C , keep warm for 4h, and cool with the furnace to obtain silicon / graphite / amorphous carbon composite negative electrode material. The prepared composite material, acetylene black, and PVdF were made into a slurry according to the mass ratio of 80:10:10, and evenly coated on the copper foil (14um). After drying, it was pun...

Embodiment 3

[0024] Dissolve 45ml of tetraethyl orthosilicate in 12ml of absolute ethanol, then add 15ml of deionized water, stir well to form a transparent solution, add dropwise oxalic acid, adjust the pH value of the solution to 4; add 8.4g of mesophase carbon microspheres (D50 8um), high-speed magnetic stirring at 55°C for 1h, slowly adding 10% ammonia water until the gel was completed; the gel was dried in an oven at 105°C to obtain a silica / graphite composite material. The obtained silica / graphite composite material was placed in a tube furnace, and a mixture of propylene gas and argon gas (5% vol propylene) was introduced at 750°C for 6 hours, and then argon was changed, and the temperature was raised to 1150°C. Keeping the temperature for 6 hours and cooling with the furnace to obtain the silicon / graphite / amorphous carbon composite negative electrode material. The prepared composite material, acetylene black, and PVdF were made into a slurry according to the mass ratio of 80:10:10,...

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Abstract

The invention discloses a preparation method of a lithium ion battery silicon-carbon composite cathode material. The preparation method is characterized by comprising the following steps: 1), dissolving ethyl orthosilicate in a mixed solution of absolute ethyl alcohol and deionized water, adding organic acid in the solution, regulating the pH value of the solution to 3-5, and marking the solution as a solution A; 2), adding graphite particles in the solution A, stirring the mixture, and marking the mixture as a mixture B; 3), slowly adding ammonia water in the mixture B while stirring by high speed magnetic force, wherein the concentration of the ammonia water is 10-20%, adding a basic catalyst until forming gel; 4), drying gel prepared in the step 3 at 90-110 DEG C; 5), introducing hydrocarbon gas and nitrogen or the mixed gas of nitrogen and argon to the gel material prepared in the step 4 at 600-800 DEG C for 2-6 h, and then introducing high-pure nitrogen or high-pure argon, raising the temperature to 900-1200 DEG C, keeping the temperature for 1-6 h, cooling the mixture, and at last obtaining the silicon-carbon composite cathode material.

Description

technical field [0001] The invention belongs to the field of electrochemical power sources, and relates to a method for preparing a silicon-carbon composite negative electrode material for a lithium ion battery, in particular to a method for preparing a silicon / graphite / amorphous carbon composite negative electrode material for a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, wide operating temperature range, stable discharge, small size, light weight, and no memory effect. They have been shown in portable electronic equipment, electric vehicles, space technology, and defense industries. Broad application prospects III. With the increasing demand for high-capacity, long-life batteries for mobile electronic devices, people have put forward higher requirements for the performance of lithium-ion batteries. As an important factor to improve the energy and cycle life of lithium-ion batte...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/362Y02E60/10
Inventor 宫毓鹏张波孙国娟郝润秋卢阳
Owner CHINA NAT OFFSHORE OIL CORP
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