Power lithium ion battery silicon-carbon composite negative electrode material preparation method

A lithium-ion battery, silicon-carbon composite technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of limited application, large specific surface area of ​​materials, low initial efficiency, etc., to suppress agglomeration, suppress volume effect, avoid The effect of side effects

Pending Publication Date: 2016-12-07
SHENZHEN BAK POWER BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN102683649A Resorcinol and formaldehyde are used to form a carbon airgel coating layer with a pore structure on the surface of nano silicon powder and ultrafine graphite. Although the surface structure and cycle performance of the silicon carbon material are improved, the specific surface area of ​​the material is large. The low efficiency for the first time limits its application in lithium batteries
CN101244814A Mix and carbonize asphalt solution, nano-silicon powder and granular natural graphite to prepare silicon-carbon negative electrode material. This method is difficult to disperse nano-silicon powder uniformly, and the first-time efficiency of the prepared material is low

Method used

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  • Power lithium ion battery silicon-carbon composite negative electrode material preparation method
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  • Power lithium ion battery silicon-carbon composite negative electrode material preparation method

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Embodiment approach

[0034] Such as figure 1 As shown, the preparation method of the power lithium-ion battery silicon-carbon composite negative electrode material of the present application, an embodiment thereof, comprises the following steps:

[0035] Step 102: Prepare polyimide-coated nano-silicon particle slurry.

[0036] Step 104: Spray-drying and granulating the slurry to obtain polyimide-coated nano-silicon particle powder.

[0037] When the slurry is spray-dried and granulated, the feed rate is 5Kg / h-15Kg / h, the air inlet temperature is 200-300°C, the air outlet temperature is 90-150°C, and the spray frequency is 250-350Hz. Spray drying can be performed in a spray dryer or spray drying equipment.

[0038] Step 106: After placing the polyimide-coated nano-silicon particle powder in a reactor for high-temperature calcination, carry out non-destroying coating structure crushing and granulation treatment.

[0039] The polyimide-coated nano-silicon particles are calcined in a reactor, at a ...

Embodiment 1

[0057] one. Preparation of polyimide-coated nano-silicon particle slurry: under the condition of ultrasonic power of 150w, add 1Kg of nano-silicon particle powder and 30g of silane coupling agent to 600g of N,N'-dimethylacetamide, and ultrasonically stir for 12h , then add 2Kg of 4,4'-diaminodiphenyl ether to the reaction system, stir until the 4,4'-diaminodiphenyl ether is completely dissolved, and put 2. Add 178Kg pyromellitic dianhydride to the reaction system in 4 times, stir for 12 hours to obtain a composite glue, then degrade the composite glue in a hot water bath at a temperature of 30°C for 30 minutes, and filter to remove gases and impurities , and finally carry out chemical imidation with 1kg acetic anhydride and 1kg pyridine to obtain nano-silicon particle / polyimide slurry;

[0058] two. Preparation of polyimide-coated nano-silicon particles: the slurry was spray-dried and granulated, the feed rate was 5Kg / h, the air inlet temperature was 200°C, the air outlet te...

Embodiment 2

[0064] one. Preparation of polyimide-coated nano-silicon particle slurry: under the condition of ultrasonic power of 180w, add 1Kg of nano-silicon particle powder and 40g of silane coupling agent to 700g of N,N'-dimethylacetamide, and ultrasonically stir for 14h , then add 3Kg of 4,4'-diaminodiphenyl ether to the reaction system, stir until the 4,4'-diaminodiphenyl ether is completely dissolved, and put 3. Add 267Kg of pyromellitic dianhydride to the reaction system in 4 times, stir for 14 hours to obtain a composite glue, then degrade the composite glue in a hot water bath at a temperature of 30°C for 30 minutes, and filter to remove gases and impurities , and finally carry out chemical imidation with 1.5Kg acetic anhydride and 1.5Kg pyridine to obtain nano-silicon particle / polyimide slurry;

[0065] two. Preparation of nano-silicon particles / polyimide particles: The slurry is spray-dried and granulated, the feed rate is 6Kg / h, the air inlet temperature is 220°C, the air ou...

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Abstract

The invention discloses a power lithium ion battery silicon-carbon composite negative electrode material preparation method. The method comprises the following steps: preparing a polyimide coated nano-silicon particle slurry; carrying out spray drying granulation on the slurry to prepare polyimide coated nano-silicon particle powder; placing the polyimide coated nano-silicon particle powder in a reactor, carrying out high temperature calcining, carrying out non-destructive coating structure crushing, and granulating the crushed powder; and mixing the crushed powder with graphite material powder to prepare a silicon-carbon composite negative electrode material. The surface of silicon nano-particles is uniformly covered with a conductive carbon layer generated by pyrolysis of polyimide polymer, so the volume effect of the silicon particles, appearing in the battery charge and discharge process, is effectively inhibited, and unnecessary side reactions between silicon and an electrolyte are avoided, and a nano-silicon particle dispersion containing the polyimide polymer effectively inhibits the agglomeration phenomenon of the silicon nano-particles in the dispersion and can be used as the adhesive in a next spray drying process.

Description

technical field [0001] The present application relates to the field of power lithium-ion battery production, in particular to a method for preparing a silicon-carbon composite negative electrode material for a power lithium-ion battery. Background technique [0002] With the rapid development and wide application of various 3C electronic products and electric vehicles, the demand for lithium-ion batteries with high energy density, good rate performance and good cycle performance is becoming more and more urgent. At present, the negative electrode material of commercial lithium-ion batteries is mainly graphite. Due to its low theoretical specific energy (372mAh / g) and poor high-rate charge and discharge performance, it is a stumbling block for the further development of lithium-ion batteries. Formation of LiC after lithium intercalation compared to conventional graphite 6 Intercalation compounds, silicon as the anode material, usually alloyed with lithium to form Li 22 Si ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCY02E60/10
Inventor 柳青林建
Owner SHENZHEN BAK POWER BATTERY CO LTD
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